COMSPHERE 3600 SERIES DATA SERVICE UNITS MODELS 3610 AND 3611 TIME DIVISION MULTIPLEXER, MULTICHANNEL MULTIPOINT, AND DIGITAL BRIDGE OPTIONS APPLICATIONS GUIDE Document No.
COMSPHERE 3600 Series Data Service Units COMSPHERE 3600 Series Data Service Units Models 3610 and 3611 Time Division Multiplexer, Multichannel Multipoint, and Digital Bridge Options Applications Guide 3610-A2-GB41-60 7th Edition (March 1999) Changes and enhancements to the product and to the information herein will be documented and issued as a new release to this manual.
Safety Instructions ! Important Safety Instructions 1. Read and follow all warning notices and instructions marked on the product or included in the manual. 2. This product is intended to be used with a 3-wire grounding type plug — a plug which has a grounding pin. This is a safety feature. Equipment grounding is vital to ensure safe operation. Do not defeat the purpose of the grounding type plug by modifying the plug or using an adaptor.
COMSPHERE 3600 Series Data Service Units Notices
Table of Contents Preface About this Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . How to Use this Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reference Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii vii viii viii Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMSPHERE 3600 Series Data Service Units 3. Model 3611 Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hardware Straps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Software Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Verification Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents List of Figures 3610-A2-GB41-60 Figure Page 1-1 1-2 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 3-1 3-2 3-3 3-4 3-5 4-1 4-2 4-3 4-4 4-5 4-6 4-7 4-8 4-9 4-10 4-11 4-12 4-13 4-14 4-15 4-16 4-17 4-18 4-19 4-20 4-21 4-22 4-23 4-24 1-7 1-8 2-3 2-3 2-4 2-5 2-6 2-7 2-9 2-14 3-3 3-4 3-9 3-10 3-11 4-3 4-5 4-7 4-8 4-9 4-10 4-11 4-12 4-13 4-15 4-16 4-17 4-18 4-19 4-20 4-21 4-22 4-24 4-26 4-27 4-28 4-29 4-30 4-31 Model 3610 DSU with TDM or MCMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMSPHERE 3600 Series Data Service Units Figure Page 4-25 4-26 4-27 4-28 4-29 4-30 4-31 4-32 4-33 4-34 4-32 4-33 4-34 4-35 4-36 4-37 4-39 4-40 4-41 4-35 4-36 4-37 4-38 4-39 4-40 4-41 4-42 4-43 4-44 4-45 4-46 4-47 4-48 4-49 5-1 5-2 5-3 5-4 5-5 5-6 5-7 5-8 5-9 5-10 5-11 5-12 5-13 C-1 C-2 C-3 C-4 C-5 C-6 D-1 D-2 D-3 D-4 D-5 D-6 iv Case 4 – Backing Up (Up to) Three Channels via the FEP Port-Sharing Feature . . Digital Bridge/DCE Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents Figure D-7 D-8 D-9 D-10 D-11 D-12 D-13 D-14 D-15 3610-A2-GB41-60 Page Extended Bridge Configuration: Automatic Partial Backup – Dial Backup Not Active . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Extended Bridge Configuration: Automatic Partial Backup Active – Dial Backup Active for All Drops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMSPHERE 3600 Series Data Service Units List of Tables Table 4-1 5-1 5-2 5-3 5-4 5-5 5-6 5-7 5-8 5-9 5-10 5-11 5-12 5-13 C-1 C-2 C-3 C-4 C-5 C-6 C-7 C-8 vi Page LADS Connection Distances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TDM and MCMP Status Indicators (Model 3611 Only) . . . . . . . . . . . . . . . . . . . . . . DSU with TDM or MCMP and DBM-V/DBM-S/DBM-D Status Indicators . . . . . . DTE Lead Status Codes . . . . . . . . . . . . . . . . . . . . . . .
Preface About this Guide How to Use this Guide This applications guide is intended as a supplement to the operator’s guide; it only contains installation and operation information that is specific to the Time Division Multiplexer (TDM), Multichannel Multipoint (MCMP), and digital bridge options for the COMSPHEREr 3600 Series Data Service Units (DSUs), Models 3610 and 3611. Chapter 1 gives a general overview of the features for the 3600 Series DSU and its TDM and MCMP options.
COMSPHERE 3600 Series Data Service Units Related Documents 6800-A2-GB31 COMSPHERE 6800 Series Network Management System Communications Products Support Command Reference Manual 999-100-1961S DATAPHONE II 2600 Series Data Service Units, User’s Manual Basic DSU product documentation includes the following: 3610-A2-GB46 3610-A2-GB48 COMSPHERE 3600 Series Data Service Units, Models 3610 and 3611, User’s Guide COMSPHERE 3600 Series Data Service Units, Models 3610 and 3611, Time Division Multiplexer, Mult
Overview Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Optional Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DSU with TDM Capability . . . . . . . . .
COMSPHERE 3600 Series Data Service Units LPDA-2 interoperability is provided by the systems network architecture (SNA) Diagnostic Interface option that is installed on the DSU circuit card. It supports DSU management from IBM’s NetViewt host-based network management system (NMS), as well as management from a Paradyne NMS or the DSU’s diagnostic control panel (DCP). This option also supports DBM (including the DBM-V, DBM-S, and DBM-D), TDM, MCMP, and digital bridge capability.
Overview • Port speeds. Speeds of the individual TDM ports (1 through 6) can be set to 1.2, 2, 2.4, 4, 4.4, 4.8, 7.2, 8.4, 9.2, 9.6, 12, 14.4, 16.8, 18, 18.8, 19.2, 28.8, 32, 38.4, 48, 56, or 64 kbps full-duplex. The sum of the port speeds cannot exceed the line speed. • Digital bridge. The TDM can be configured to perform a digital bridge function. The digital bridge capability can support many applications, including dedicated multipoint dial backup and multipoint LADS operation.
COMSPHERE 3600 Series Data Service Units DSU with MCMP Capability The MCMP capability is an enhancement to TDM and allows up to six independent application programs to share one standard 56 kbps multipoint facility. Only an MCMP can be configured to provide MCMP capability and provides the following features: • Channel capacity. The channel capacity is six channels, which can be assigned to any of the physical ports.
Overview • Restoration. When the DSU rate equals the DBM rate, tributary DSUs can be configured to automatically drop the backup connection and switch back to the DDS facility when service has been restored to the DDS network. When the DSU rate is not equal to the DBM rate, restoration can only be accomplished remotely from an NMS or manually from the control DSU’s DCP.
COMSPHERE 3600 Series Data Service Units Models they fill two adjacent slots in the COMSPHERE 3000 Series Carrier. The 3600 Series DSUs are available in two models: There are two types of Model 3611 TDM or MCMP circuit cards: non-modular and modular. • Model 3610 is a standalone desktop unit. • Model 3611 is a circuit card for installation in a COMSPHERE 3000 Series Carrier.
Overview DIAGNOSTIC CONTROL PANEL CO MS PH ER E3 61 0 WALL-MOUNT AC TRANSFORMER STATUS INDICATORS TABLE-TOP AC TRANSFORMER V.35 INTERFACE (PORT 1) DDS INTERFACE DBM INTERFACE NETWORK DIAGNOSTIC INTERFACE EIA232D/V.24 INTERFACE (PORT 1) PORT 2 PORT 3 PORT 4 LOW VOLTAGE AC POWER IN ADDITIONAL EIA-232 INTERFACES PORT NUMBERS 2 – 6 PORT 5 PORT 6 496-13091-04 Figure 1-1.
COMSPHERE 3600 Series Data Service Units Figure 1-2.
Overview DBM Types Government Requirements Three dial backup modules (DBMs) are available. A DBM is optional and provides an alternate data path in case the digital connection fails. Each of the three DBM types listed below occupy one slot in the COMSPHERE 3000 Series Carrier. For the Government Requirements and specific instructions pertaining to connection to the telephone network, refer to the COMSPHERE 3600 Series Data Service Units, Models 3610 and 3611, User’s Guide.
COMSPHERE 3600 Series Data Service Units 1-10 March 1999 3610-A2-GB41-60
Model 3610 Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hardware Straps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Changing Hardware Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Changing the Flex Interface Switch .
COMSPHERE 3600 Series Data Service Units This chapter contains only installation information that is specific to a TDM or MCMP, including the Flex and DSD options. Hardware Straps HANDLING PRECAUTIONS FOR STATIC-SENSITIVE DEVICES NOTE Unless specifically noted, TDM refers to a TDM, TDM/Flex, or TDM/DSD, and MCMP refers to an MCMP, MCMP/Flex, or MCMP/DSD. This product is designed to protect sensitive components from damage due to electrostatic discharge (ESD) during normal operation.
Model 3610 Installation Figure 2-1. Model 3610 TDM/Flex or MCMP/Flex Switch Locations Figure 2-2.
COMSPHERE 3600 Series Data Service Units Changing Hardware Settings TDM or MCMP you have – either the switch (Flex) or option card (DSD). If you have a new TDM/Flex or MCMP/Flex or if you ordered a Flex field installation upgrade for a DSU having firmware version 6.3x or greater, you do not change hardware straps; you set each port to operate independently of the others via the DCP, an async terminal, or an NMS.
Model 3610 Installation 3. Disconnect the keypad flat cable from the DSU circuit card by squeezing the latches on each side of the cable and gently pulling up (refer to Figure 2-4). 5. Disconnect the TDM/MCMP flat cable. 4. Disconnect the LCD flat cable by gently working the cable, not the connector, free of its connector. Be careful not to bend any of the cable pins. 7. Remove the DSU from the base. Carefully lift the DSU up until its connectors are free of the rear panel.
COMSPHERE 3600 Series Data Service Units Changing the Flex Interface Switch 3. Insert a small pointed tool into position 1 of Switch S1, and carefully flip the switch in the direction of the circuit card label identifying the setting. To select EIA, push switch to EIA (Off) direction. To select V.35, push switch to V.35 (ON) direction. The TDM or MCMP field installation upgrade is shipped from the factory with the switch position set to EIA-232.
Model 3610 Installation Changing the DSD Option Card 2. Turn the card around, and re-insert the option card so that from the rear, the option card reads THIS SIDE FACES REAR FOR V.35. The TDM/DSD or MCMP/DSD is shipped from the factory with the option card set to EIA-232. The following procedure tells you how to change this setting to V.35 or back to EIA-232. 3. Reinstall the DSU circuit card, securing it to the base with the three screws (refer to Figure 2-4). 4.
COMSPHERE 3600 Series Data Service Units Electrical Connection CAUTION Only use the power transformer designed for the Model 3610 DSU. Using other transformers may result in personal injury or damage to the equipment. CAUTION The power cord with ac transformer contains a 3-wire grounding-type plug which has a grounding pin. This is a safety feature. Grounding of the unit is vital to ensure safe operation. Do not defeat the purpose of the grounding plug by modifying it or by using an adapter. 4.
Model 3610 Installation WITHOUT TDM or MCMP OPTION FRONT BEZEL O C WALL-MOUNT AC TRANSFORMER M E ER H SP 10 36 TABLE-TOP AC TRANSFORMER SNAP TABS (4) FRONT BEZEL WITH TDM or MCMP OPTION LOW VOLTAGE AC POWER IN DBM INTERFACE DDS INTERFACE V.35 INTERFACE (PORT 1) NETWORK DIAGNOSTIC INTERFACE EIA-232-D/V.24 INTERFACE (PORT 1) PORT 2 WALL-MOUNT AC TRANSFORMER PORT 3 PORT 4 PORT 5 PORT 6 NOTE: ADDITIONAL EIA-232 INTERFACES PORT NUMBERS 2 – 6.
COMSPHERE 3600 Series Data Service Units Network Diagnostic Connection If the DSU, DBM, TDM or MCMP (MUX) fails the power-up test: " Procedure 1. Reinstall the factory configuration options; use the FacT configuration for a tributary or FacC for a control. 2. Confirm the installed hardware options (DBM, TDM, or MCMP). 3. Re-execute the Device Test. (Press the key to return to the top-level menu, then select Local Test DSU Devic). If the test passes, continue with the installation.
Model 3610 Installation To change configuration options of the Model 3610 DSU from the DCP or the Model 3610 from an async terminal, select the Local branch, then the Configuration (Confg) branch. (If not displayed, press the key until Confg is displayed, then press the function key below the selection.) Select Opts (for Configuration Options), then Load.
COMSPHERE 3600 Series Data Service Units Verification Testing 3. Perform a Digital Test on both the DBM and the PSTN or switched 56 kbps circuit. Perform verification testing after any installation. After installing and configuring a network, including control and tributary DSUs, the DDS network and, if appropriate, DBMs and their dial connections, perform the following series of tests from the control DSU (using the DCP, an async terminal, or an NMS) to verify network operation.
Model 3610 Installation Adding a TDM/Flex or MCMP/Flex to an Installed Model 3610 DSU If connecting a port to data communications equipment (DCE), a crossover cable is required (feature number 3211-178F for a V.35 Crossover Cable or feature number 4951-035F for an EIA-232 Crossover Cable). If using V.35 operation, a V.35 adapter (feature number 3000-F1-510) is required for Ports 2 through 6; the V.35 connector on the DSU is used for Port 1.
COMSPHERE 3600 Series Data Service Units Getting Started 5. If a TDM or MCMP is being replaced, disconnect the additional port interface cable(s), as well. As you follow these steps, refer to Figure 2-8. " Procedure NOTE If a TDM or MCMP is being replaced, the unit does not have to be turned upside down to open the case. 1. Unplug the table-top ac transformer from the ac outlet, then disconnect the power cord from the DSU’s rear panel (labeled POWER). 2.
Model 3610 Installation Removing the DSU from Its Base Installing a TDM/Flex or MCMP/Flex Refer to Figure 2-4 as you follow these steps. If replacing a TDM or MCMP, refer to this figure as you remove the current TDM or MCMP. To change the Flex interface S1 switch, refer to the Changing the Flex Interface Switch section of this chapter. To complete the TDM/Flex or MCMP/Flex installation, refer to Figure 2-4 while following this procedure. " Procedure 1.
COMSPHERE 3600 Series Data Service Units Reassembling the Unit 4. Plug the 3-prong plug of the table-top ac transformer into the ac outlet. If installing a 6-port TDM/Flex or MCMP/Flex and the DSU has a wall-mount ac transformer, the wall-mount ac transformer must be replaced with a table-top ac transformer. If installing a 2-port TDM/Flex or MCMP/Flex on a unit having a wall-mount ac transformer, plug the ac transformer into the ac outlet.
Model 3611 Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Non-Modular DSU with a TDM or MCMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Modular DSU with a TDM or MCMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DBM-Vs/DBM-Ss/DBM-Ds . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMSPHERE 3600 Series Data Service Units Non-Modular DSU with a TDM or MCMP The non-modular Model 3611 DSU-TDM or DSU-MCMP has connectors mounted directly onto the circuit cards. With this type of unit, the DTE cables must be disconnected before the unit can be removed from the carrier. A 60-pin high-density connector is mounted onto the TDM or MCMP circuit card.
Model 3611 Installation Hardware Straps HANDLING PRECAUTIONS FOR STATIC-SENSITIVE DEVICES This product is designed to protect sensitive components from damage due to electrostatic discharge (ESD) during normal operation. When performing installation procedures, however, take proper static control precautions to prevent damage to equipment. If you are not sure of the proper static control precautions, contact your nearest sales or service representative.
COMSPHERE 3600 Series Data Service Units Figure 3-2. Modular TDM/MCMP Circuit Card Switch Locations Software Configuration A default software configuration is loaded in the DSU at the factory. If the TDM option is installed, the Model 3611 DSU is configured as a control with TDM mode enabled and Port 1 set to operate at 9.6 kbps. If the MCMP option is installed, the DSU is configured as a control with MCMP mode enabled and Port 1 set to operate at 9.6 kbps.
Model 3611 Installation For a DSU configured for TDM mode, perform a Digital Test on each active port. For the 6700 Series NMS, configuration options are menu-driven. Select Config→Network→Devices→ the appropriate submenu selection. For a DSU configured for MCMP mode, perform a Digital Test on each tributary DSU on the aggregate channel.
COMSPHERE 3600 Series Data Service Units " Procedure Adding a TDM or MCMP to an Installed Model 3611 DSU 1. From the control DSU, go to the Control (Ctrl) branch, select LEDs, and then select Aggregate (Aggr) to monitor the aggregate 56 kbps digital signal. This section describes the installation procedure for adding the TDM or MCMP option onto the Model 3611 DSU, and then installing it in a COMSPHERE 3000 Series Carrier. 2.
Model 3611 Installation Installing a Non-Modular TDM or MCMP 6. Attach the two remaining standoff posts to the DSU with the two Phillips-head screws and flat washers. Tighten the screws until the standoff posts fit snugly against the circuit card; do not overtighten. This section describes the procedure for adding a non-modular TDM or MCMP circuit card onto a Model 3611 DSU and then into a COMSPHERE 3000 Series Carrier. 7.
COMSPHERE 3600 Series Data Service Units Press the latches to secure the DSU and TDM or MCMP circuit cards in the carrier to prevent the DSU-TDM or DSU-MCMP unit from being dislodged during installation of the DTE interfaces. Rotate the circuit pack lock on the DSU circuit card faceplate back into the closed position and tighten the screw.
Model 3611 Installation Figure 3-3.
COMSPHERE 3600 Series Data Service Units Installing a Modular TDM or MCMP This section describes the procedure for adding a modular TDM or MCMP circuit card onto a Modular 3611 DSU and then into a COMSPHERE 3000 Series Carrier. A connector module, which is supplied with each modular TDM or MCMP card, has six ports (labeled Port 1 through Port 6). The connector module is shown on the right in Figure 3-4.
Model 3611 Installation To remove the installed Modular 3611 DSU: " Procedure 1. Use a Phillips screwdriver to loosen the screw holding the circuit pack lock on the Modular 3611 DSU, and rotate the lock to the open position (Figure 3-5). 2. Pull out and down on the latch at the bottom of the modular DSU’s faceplate until the circuit card starts to come out of its slot in the carrier. Pull the circuit card free of the carrier and set the DSU on a clean, ESD (anti-static) workpad. 3.
COMSPHERE 3600 Series Data Service Units 7. At the front of the carrier, make sure that both the top and bottom edges of the modular DSU-TDM or DSU-MCMP circuit cards are correctly aligned in their respective circuit card guides. Then, slide the modular DSU-TDM or DSU-MCMP unit into the carrier and press the faceplate latches on both circuit card faceplates to secure the circuit cards into the connector module.
Model 3611 Installation Removing TDM or MCMP from an Installed Model 3611 DSU 4. On the TDM or MCMP side of the unit, remove the screws securing the standoff posts to the TDM or MCMP circuit card. For a non-modular unit, there are three screws and standoff posts (Figure 3-3); for a modular unit, there are four screws and standoff posts (Figure 3-5). To remove the TDM or MCMP circuit card: " Procedure 5.
COMSPHERE 3600 Series Data Service Units 3-14 March 1999 3610-A2-GB41-60
Principles of Operation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Network Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Point-to-Point Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Multipoint Transmission . . . . . . . . . .
COMSPHERE 3600 Series Data Service Units Setup – DBM Rate Less Than DSU Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manual DDS Restoration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LADS Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Point-to-Point LADS . . . . . . . . . . . . . . . . . . . . . . .
Principles of Operation Multipoint Transmission In multipoint transmission (Figure 4-1), a control DSU is connected through the digital facility to multiple tributaries communicating at the same rate. Traditionally, a tributary site (often referred to as a drop) can transmit data only when it is polled by the front-end processor (FEP). The FEP, a communications computer associated with a host computer, is the data terminal equipment (DTE) at the control DSU.
COMSPHERE 3600 Series Data Service Units Modes Of Operation TDM Mode A DSU with TDM or MCMP can operate in one of four modes: TDM mode (MUX Funct: TDM), MCMP mode (MUX Funct: MCMP), Bridge mode (MUX Funct: CBrdg or EBrdg), or Basic mode (MUX Funct: None). TDM and Bridge modes are available to a DSU with TDM; TDM, MCMP, and Bridge modes are available to a DSU with MCMP. The DSU operates in Basic mode when the TDM or MCMP circuit card is disabled.
Principles of Operation Time Division Multiplexing Since transmission facilities are expensive, and frequently two or more low-speed point-to-point applications can share a high-speed digital facility, it is more efficient to share that capacity. This sharing is provided by 3600 Series DSUs equipped with a TDM ( operating in TDM mode ). A pair of 3600 Series DSUs with TDM or MCMP operating in TDM mode can provide the equivalent of up to six point-to-point circuits via a single DDS line (Figure 4-2).
COMSPHERE 3600 Series Data Service Units Speed Characteristics In-Band Framing and Underspeed Channel In time division multiplexing, the speed of the DDS line must equal or exceed the combined speeds of digital signals to be transmitted at each DTE interface. For example, if the multiplexer in Figure 4-2 has five pairs of DTEs operating at 9.6 kbps and one pair of DTEs operating at 4.8 kbps for a combined speed of 52.8 kbps, a DDS line speed of 56 kbps could accommodate all six pairs.
Principles of Operation TDM Architecture NOTE Figure 4-3 shows a high-level view of the TDM architecture. Port 1 on the DSU is routed to the TDM or MCMP, where it is multiplexed with Ports 2 through 6. The aggregate data path of the multiplexer is routed back to the DDS core* by the data router. The data router is a sophisticated circuit switch in the DSU that is capable of connecting several communication interfaces in a variety of ways.
COMSPHERE 3600 Series Data Service Units TDM Applications The TDM capability can be used in a variety of configurations to enhance DDS service. Configurations discussed here include point-to-point multiplexing, a TDM backbone circuit with extensions, diagnostic extension, digital sharing, multiplexing and digital sharing, and FEP port-sharing.
Principles of Operation Multipoint Async Compatibility NOTE The control DSU with the Single-Port Async/Sync feature is compatible with earlier DSU releases that use a TDM with the ports configured as a single port-sharing group, as long as the control DSU’s port speed and port-sharing group port speeds are the same. Earlier DSU releases from 4.xx to 5.xx can be accommodated as long as the control DSU’s software version is 6.xx; otherwise, the units should be returned to the factory to be upgraded.
COMSPHERE 3600 Series Data Service Units Point-to-Point Multiplexing The 3600 Series DSU operating in TDM mode can be used for point-to-point circuits at speeds of up to 64 kbps. Figure 4-6 shows a typical TDM application. In point-to-point multiplexing, the DTEs at Port 1 communicate with one another, the DTEs at Port 2 communicate with one another, and so on. The TDM point-to-point application provides the same functionality as six point-to-point circuits.
Principles of Operation TDM Backbone Circuit with Extensions Digital Sharing Figure 4-7 shows a 3600 Series DSU with TDM as the DDS backbone with an analog private line (APL) extended circuit. In this example, Port 4, which is set to underspeed, cannot support an extended circuit because extended circuit equipment cannot accept off-speed clocks. Port 1 at 2400 bps can be extended via a crossover cable to the extended circuit ( refer to Appendix C ).
COMSPHERE 3600 Series Data Service Units Figure 4-8.
Principles of Operation Multiplexing and Digital Sharing When digital sharing is combined with the TDM or MCMP multiplexing capability, in-band framing must be taken into account. The TDM circuit card can support up to two digital-sharing groups, while the MCMP circuit card can support up to three. NOTE Port Speed assignments should be the same at both the control and tributary DSUs.
COMSPHERE 3600 Series Data Service Units FEP Port Sharing FEP port sharing is a method of connecting a front-end processor (FEP) to multiple control DSUs/modems to broadcast the same message over different circuits, yet receive individual responses.
Principles of Operation Figure 4-10.
COMSPHERE 3600 Series Data Service Units TDM Backup A point-to-point multiplexing circuit can be backed up through the switched telephone network. There are five possible configurations: • Case 1 – V.32 Backup for subrate DDS ( Figure 4-11 ). If the DDS network is out-of-service, the network management system can initiate dial backup or, if configured for automatic dial backup, the control or tributary DSU can initiate dial backup.
Principles of Operation • Case 2 – V.32 Backup for high-speed DSU ( Figure 4-12 ). The DBM port speeds must be reconfigured so that their sum is less than or equal to 14.4 kbps, the PSTN line speed. When the sum equals the line speed ( now 14.4 kbps ), one of the synchronous ports must be configured for underspeed. One possible configuration is to allow one port to remain at 9600 bps, reconfigure one port to 4800 bps running at underspeed, and reconfigure all other ports to Off.
COMSPHERE 3600 Series Data Service Units • Case 3 – V.32 Backup for high-speed DSU with extended circuits ( Figure 4-13). When the backbone circuit is restored at 14.4 kbps, the port speeds at the tributary DSU may need to be reduced. If the port speed of the extended circuit must be reduced, then the speed of the extended modems must be reduced accordingly.
Principles of Operation • Case 4 – Switched 56 Backup for DSU operating at 56 kbps or less ( Figure 4-14 ). The Switched 56 DBM provides full backup of point-to-point single port and TDM circuits operating at 56 kbps. If the DDS circuit is operating at less than 56 kbps, rate adaption is used to match the DDS speed. Figure 4-14.
COMSPHERE 3600 Series Data Service Units • Case 5 – Aggregate Switched Backup for TDM Circuits ( Figure 4-15 ). A point-to-point TDM circuit can be backed up using the aggregate switch capability of the DSU. This may be useful if the DBMs are shared via an external switch. In this example, the control DSU should be configured so that AggrSwitch ( Aggregate Switch ) is enabled and AgSw Timing ( Aggregate Switch Timing) is set to Aggr.
Principles of Operation Multichannel Multipoint The MCMP capability reduces the number of parallel multipoint digital private lines required by independent applications. Merging applications onto a single communications circuit reduces line, DCE, and maintenance costs (Figures 4-16 and 4-17 ). The 3600 Series DSUs with MCMP operating in MCMP mode can support up to six independent applications over a single 56 kbps standard multipoint digital facility.
COMSPHERE 3600 Series Data Service Units At the control DSU, each application in Figure 4-16 is given its own channel (A, B, or C ), and the channels are assigned to Ports 1 through 3.
Principles of Operation Line and Channel Speeds The MCMP capability operates only on a 56 kbps DDS multipoint circuit. Speeds of any channel can be set to the synchronous speed of 1.2, 2.4, 4.8, 7.2, 9.6, 12, 14.4, 16.8, 19.2, 38.4, or 48 kbps full-duplex. A channel can be used either synchronously or asynchronously. Possible asynchronous rates include all rates available to synchronous operation ( 1.2 through 48 kbps ). Asynchronous rates of 150, 300, and 1200 bps require the allocation of 1200 bps.
COMSPHERE 3600 Series Data Service Units MCMP Architecture Figure 4-18 shows a high-level view of the MCMP architecture. The data paths are established as in the TDM mode of operation via the data router. Additional multichannel multipoint circuitry is activated on the MCMP circuit card. The port arrangement on the MCMP circuit card is identical to the port arrangement on the TDM circuit card.
Principles of Operation MCMP Operation For proper MCMP operation, the network must be initialized, with the tributary DSUs added to the control DSU’s poll list. Each newly installed circuit should be verified as a working single port multipoint circuit, per Technical Publication 62310 – 1987, prior to the MCMP capability being activated to ensure that the DSUs operate properly.
COMSPHERE 3600 Series Data Service Units MCMP time. Up to three digital-sharing groups can be formed at each tributary site. The MCMP capability provides multichannel multipoint operation over a 56 kbps DDS multipoint facility. Figure 4-19 shows an example of channel-to-port assignments and channel speed selections for MCMP operation: the 48 kbps user bandwidth supports four 9600 bps channels and two 4800 bps channels.
Principles of Operation NOTE If the digital-sharing group consists of adjacent ports, the digital-sharing group can be created via an alternate method using the Sharing Device A (Share DevA) and Sharing Device B (Share DevB) configuration options. Refer to the MUX Configuration Options section of Chapter 5. Figure 4-20 shows an MCMP application using three channels, where a digital-sharing group has been formed at each of the tributary locations.
COMSPHERE 3600 Series Data Service Units MCMP Backup Backup may be achieved in one of five ways: • Case 1 – Dedicated MCMP Backup with Switched 56 DBMs ( Figure 4-21). In this case, two DBM-Ss are dedicated to the control DSUMCMP. Two tributary DSUs are equipped with a Switched 56 DBM and MCMP. A DSU with a TDM circuit card configured for extended bridge (EBrdg) mode is used to bridge the aggregate data stream to the DBMs.
Principles of Operation • Case 2 – Backing up as many channels as possible to the one most important tributary location ( Figure 4-22). In this case, the control DSU and the one tributary DSU selected for dial backup must be equipped with a DBM configured with MCMP Backup set to TDM. Essentially, the backup becomes dial backup of a point-to-point TDM circuit. Because the backup is performed in TDM mode, both TDM and MCMP configuration options must be set.
COMSPHERE 3600 Series Data Service Units • Case 3 – Backing up one complete channel (both partial and full backup) ( Figures 4-23 and 4-24). In this case, each tributary DSU in need of service restoration must be equipped with a DBM and the MCMP Backup configuration option must be set to TDM, with only one port assigned bandwidth. At the central site, an extended bridge and a DBM-V for each tributary must be available. (Refer to the Multipoint Dial Backup section of this chapter.
Principles of Operation When backup is provided for one channel, the MCMP circuit can support a total of five application channels, and the control DSU must have the backup port and the next highest port configured as an FEP port-sharing group. The channel to be backed up must appear on Port 1, 3, or 5, and the port speed cannot exceed 14.4 kbps.
COMSPHERE 3600 Series Data Service Units • Case 4 – Backing up ( up to ) three channels at each tributary via the FEP port-sharing feature ( Figure 4-25 ). In this case, each tributary DSU to be backed up must be equipped with a DBM and the MCMP Backup configuration option should be set to TDM. At the central site, a DSU-DBM-TDM or DSU-DBM-MCMP unit operating in TDM mode must be available for each tributary to be backed up.
Principles of Operation There are several restrictions to implementation: • There can be at most three DTE inputs (channels). • The sum of the channel speeds should be less than the DBM speed. • The ports that are connected using the FEP port-sharing feature should be set to the same port speed or disabled (Disab) in the Port Speed (PrtSp) configuration options for both the DSU and DBM.
COMSPHERE 3600 Series Data Service Units • Case 5 – Aggregate switched backup for MCMP circuits. An MCMP circuit can be backed up using the aggregate switch capability of the DSU. In Figure 4-27, the control DSU should be configured so that AggrSwitch (Aggregate Switch) is enabled and AgSw Timing (Aggregate Switch Timing) is set to the appropriate timing source to be used during dial backup. The Bridge is configured so Brdg Timing (Bridge Timing) is set to Ext for Port 1.
Principles of Operation Digital Bridge A TDM or MCMP circuit card can be configured to perform digital bridge capability. This is a special case of digital sharing where all active ports on the bridge are configured to one digital-sharing group with or without contention. A digital bridge can be configured as a central-site bridge (CBrdg), or an extended bridge (EBrdg) when more bridging capability is needed.
COMSPHERE 3600 Series Data Service Units If more bridging capability is needed, additional DSU-TDM or DSU-MCMP units configured as an extended bridge (EBrdg) can be connected to the central-site bridge, the controlling bridge. Up to four extended bridges can be added to a central-site bridge to provide a total of 20 bridging ports, depending upon the application ( Figure 4-29 ). Figure 4-29.
Principles of Operation For non-modular Model 3611 DSUs with digital bridge capability, a digital bridge interface (crossover) cable attaches to the 60-pin high-density connector on the TDM or MCMP circuit card to provide fan-out cabling to five individual 25-pin EIA-232 connectors.
COMSPHERE 3600 Series Data Service Units Diagnostic Considerations The digital bridge joins the aggregate data stream, including data, framing bits, and diagnostics. The diagnostic communication with tributary DSUs and DBMs is transparent to the digital bridge. Commands for a tributary DSU or DBM can be addressed via the control DSU, even when in backup. The central-site DBM-Vs, DBM-Ss, and DBM-Ds should be configured for disruptive diagnostics.
Principles of Operation Figure 4-31.
COMSPHERE 3600 Series Data Service Units Multipoint Backup Addressing For a central-site multipoint dial backup configuration, the digital bridge is controlled by the control DSU. Each central-site DBM-V, DBM-S, or DBM-D in the COMSPHERE 3000 Series Carrier has its own physical address, which is determined by the carrier number/slot number and used only for commands issued from the SDCP. In addition, each DBM-V, DBM-S, or DBM-D has a unique network address in the 1 to 255 range.
Principles of Operation Figure 4-33.
COMSPHERE 3600 Series Data Service Units Multipoint Backup Architecture In a central-site multipoint dial backup configuration during partial backup (configuration option Bridge Rate is set to =DSU), the first port of the digital bridge is included in the digital-sharing group. Under these conditions, the digital bridge is active during normal operation and valid backup calls are automatically put onto the digital bridge ( Figure 4-34 ). Figure 4-34. Central-Site Bridging Architecture (9.
Principles of Operation Data from the controlling DTE is broadcast to all ports in the digital-sharing group, including the first port of the digital bridge, where data is then directed through the DSU to the DDS line. When no dial backup is in effect ( Figure 4-34 ), the DDS core connected to the bridge is the only active port.
COMSPHERE 3600 Series Data Service Units When full backup is in effect, there is no longer any data communication from the DDS line. All tributaries are communicating with the controlling DTE via the digital bridge capability. In a central-site multipoint dial backup configuration, full backup is required if the DBM speed does not equal the DSU speed, or if the control DSU reports No Signal or Bipolar Violations. Under this condition, the bridge is inactive during normal operation.
Principles of Operation Figure 4-37. Central-Site Bridging Architecture (56 kbps) – Active Digital Bridge Central-Site DBM-Vs/DBM-Ss/DBM-Ds At the central site, a DBM is required for each drop to be backed up. A DBM-V may be used for V.32 backup. For switched 56 kbps backup, a DBM-S is used for 4-wire access and a DBM-D is used for 2-wire access to the switched 56 kbps digital service. These DBMs require one slot in the COMSPHERE 3000 Series Carrier.
COMSPHERE 3600 Series Data Service Units DBM-V/DBM-S/DBM-D Dial on DTR Capability Tributary DSU Considerations When the central site loses access to its remote DSUs, the DBM-Vs, DBM-Ss, and DBM-Ds can initiate backup based upon the state of the DBM’s DTR lead. To activate this capability, set the Primary Core configuration option to Yes and set the DTRCallCon configuration option to Orig. Then, the DBM-V/DBM-S/DBM-D originates a backup call when DTR is raised and drops the call when DTR goes low.
Principles of Operation Tributaries with Multiple Call capability should use this capability to increase their probability of connection to the bridge. The telephone numbers of all DBMs on the bridge should be entered into the tributary’s directory. The digital bridge must be configured for the appropriate number of ports (one port for each drop to be backed up) and the Bridge Rate configuration option must be set to =DSU.
COMSPHERE 3600 Series Data Service Units LADS Operation The 3600 Series DSUs with TDM or MCMP can be used as a LADS to provide either a multiplexed point-to-point link between two locations or the DSD capability at a remote location. The 3600 Series DSUs can be used as a local area data set ( LADS) to provide a point-to-point link between two data devices having like protocols. The network facility is a direct 4-wire connection without using a digital service.
Principles of Operation Point-to-Point LADS If the bridged LADS network is operating at a speed greater than 19.2 kbps, the distance between the DSUs and the digital bridge should not exceed one digital bridge interface cable. Two 3600 Series DSUs that are connected by a 4-wire, nonloaded metallic pair can support point-to-point LADS operation. A typical scenario involves two data devices located in the same building or in a campus environment.
COMSPHERE 3600 Series Data Service Units Figure 4-38.
Principles of Operation Bridged LADS Architecture One TDM circuit card operating in Bridge mode can support up to six tributary DSUs ( Figure 4-39 ). In the transmit direction, data from the controlling DTE is broadcast to all ports in the digital-sharing group. In the receive direction, data from a tributary site flows through the aggregate data path to the controlling DTE. To establish the data paths shown in Figure 4-39, the Bridge Rate configuration option must be set to =DSU.
COMSPHERE 3600 Series Data Service Units Digital Bridge/DSU Interface NMS Control Figure 4-40 shows the interconnections between a digital bridge port and a central-site 3600 Series DSU. Since both the digital bridge port and the DSU provide a DCE interface, a special crossover cable or digital bridge interface cable is used to complete the communication path. For a DSU with TDM or MCMP, the DATAPHONE II System Controller cannot configure the TDM ports or set port speeds.
Principles of Operation SNA Diagnostic Interface The SNA Diagnostic Interface option, which is compatible with IBM’s LPDA-2 ( Line Problem Determination Aid, Revision 2 ) protocol, enables management of 3600 Series DSUs from the DCP, a Paradyne NMS, IBM’s NetView management system, or all three. All DSUs on the circuit must be 3600 Series DSUs. This option is compatible with all other options available to the 3600 Series DSUs: DBM, TDM, and MCMP.
COMSPHERE 3600 Series Data Service Units Figure 4-41. Sample Configuration and LPDA-2 Addressing Assigning an Address to the Tributary DSU NOTE The following rules apply to assigning the LPDA-2 address for tributary DSUs: For MCMP, the channel assigned to Port 1 at the control DSU (control, tributary) must also be assigned to Port 1 at each tributary DSU. 1. Valid Addresses. Valid addresses for tributary DSUs range from 1 to 255. 2. Single DTE.
Principles of Operation Disconnect LPDA-2 commands. The Call Out command instructs the DSU to set up dial backup from the control site and switch to the PSTN line. The Disconnect command terminates (disconnects) the PSTN call at the control DSU and returns data to the DDS line. When digital sharing is used on a multipoint circuit, make sure there is no overlap of LPDA-2 tributary addresses.
COMSPHERE 3600 Series Data Service Units Multipoint Dial Backup The 3600 Series DSUs continue to support the DSU/CSU and Line Status command and the Transmit/Receive Test during a multipoint dial backup. The Call Out and Disconnect commands are not supported in multipoint dial backup. During a full or partial multipoint dial backup, LPDA-2 commands continue to operate between the control and tributary DSU-DBM, although the digital bridge and DBM-Vs are transparent to this operation.
Principles of Operation Figure 4-44. Multiplexing with TDM (LPDA-2 Monitoring) Figure 4-45.
COMSPHERE 3600 Series Data Service Units Digital Sharing Figures 4-46 and 4-47 show how digital sharing is used with LPDA-2 monitoring. When a digital-sharing group is configured on a tributary DSU, the DSU recognizes multiple LPDA-2 addresses instead of one. The number of addresses is equal to the number of ports comprising the digital-sharing group. In Figures 4-46 and 4-48, directing a DSU/CSU and Line Status command to LPDA-2 Address 4 will report the DTE status of Port 3.
Principles of Operation Figure 4-47.
COMSPHERE 3600 Series Data Service Units Figure 4-48.
Principles of Operation Figure 4-49.
COMSPHERE 3600 Series Data Service Units 4-62 March 1999 3610-A2-GB41-60
DSU Operations Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diagnostic Control Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Menu Structure . . . . . . . . . . . .
COMSPHERE 3600 Series Data Service Units Overview Diagnostic Control Panels This chapter identifies and discusses function and selection differences on the DSU when the TDM or MCMP optional feature is installed. It also discusses operation of DBM-Vs, DBM-Ss, and DBM-Ds, which are used in digital bridge applications.
DSU Operations Status Indicators The status indicators on the Model 3610 DSU’s DCP and on the Model 3611 DSU’s faceplate continuously provide information on the current operating condition of the DSU.
COMSPHERE 3600 Series Data Service Units Status Status Status Status Status OK OK OK OK OK Alrm Alrm Alrm Alrm Alrm Test Test Test Test Dial Dial Dial Dial 103 TXD 1 103 TXD 103 TXD 103 TXD 104 RXD 2 104 RXD 104 RXD 104 RXD 105 RTS 3 105 RTS 105 RTS 105 RTS 106 CTS 4 106 CTS 106 CTS 106 CTS 107 DSR 5 107 DSR 107 DSR 107 DSR 108 DTR 6 108 DTR 108 DTR 108 DTR 109 LSD 109 LSD 109 LSD 109 LSD Por t Front Panel Multirate DSU 3
DSU Operations Table 5-1 TDM and MCMP Status Indicators (Model 3611 Only) Label OK Color Description Green Health and status indicator. The TDM or MCMP hardware and software are operating normally. This indicator flashes two times per second if a message is present. Alrm Red Health and status indicator. An alarm condition in the TDM or MCMP hardware, firmware, or configuration data is disrupting normal operation of the TDM or MCMP processor.
COMSPHERE 3600 Series Data Service Units Table 5-2 DSU with TDM or MCMP and DBM-V/DBM-S/DBM-D Status Indicators Label OK Color Green Description Health and status indicator. The device’s operation is normal. (The device has not detected any of the alarms listed in the Alrm section below.) This indicator flashes two times per second if a message is present. Alrm Red Health and status indicator for an alarm in the local or remote device.
DSU Operations Menu Structure Local/Remote Menu Subbranches The menu tree is accessed via the DCP (SDCP for a DBM-V, DBM-S, or DBM-D) and is shown in Appendix A. The menus that appear in the menu tree depend upon the DSU’s function within the network (control or tributary), the hardware options that are installed ( DBM, TDM or MCMP, LPDA* ), and the DSU’s mode of operation.
COMSPHERE 3600 Series Data Service Units • The Control (Ctrl) branch provides the ability to display and change external leads, enable or disable the DSU-DBM, and access and monitor the external leads for Ports 1 through 6. The circuit designation status indicators (TXD, RXD, etc.) reflect the status of the selected port. NOTE In most of the examples that follow, additional menu selections that do not fit onto the DSU’s screen are shown beneath the DCP.
DSU Operations Health and Status Results Health and Status (H/S) enables you to display the status of the DSU, as well as a DBM, TDM or MCMP, if installed. It automatically scans for DSU and line conditions that are not within normal limits. When the digital circuit is the active link, the first line displays a running normal-operation timer ( hhh:mm:ss).
COMSPHERE 3600 Series Data Service Units Subnetwork Health and Status For TDM, MCMP, or Bridge mode, the following additional menu appears: Subnetwork Health and Status (Subn) provides status information from a DSU’s subnetwork (all DSUs and DBMs assigned to that DSU’s active poll list). The downstream network addresses and current statuses are listed. Use the F1 and F2 keys to page through the tributary addresses.
DSU Operations Circuit Quality Terminal Power Circuit Quality (CircQ) only appears when a V.32 DBM is installed. The report shows the level and quality of the signal being received from the network by the V.32 DBM. Terminal Power (TPwr) shows the status of the connected DTE’s EIA-232-D or V.35 interface. The DSU checks the state of the request-to-send (RTS) lead and reports the DTE powered ON if the voltage is approximately less than –3V or greater than +3V for both EIA-232 and V.35 interfaces.
COMSPHERE 3600 Series Data Service Units Backup Branch The Backup (Bckup) branch controls operation of the point-to-point dial backup feature. The Bckup selection only appears when a DBM (V.32 DBM, 4-wire Switched 56 DBM, or 2-wire Switched 56 DBM) is installed, Central-Site Bridge (CBrdg) is enabled, or Aggregate Switch (AggrSwitch) is enabled. The DBM/DBM-V/DBM-S/DBM-D section discusses the full set of available commands when a DBM is installed.
DSU Operations Table 5-5 Backup Branch Menu Selections Current DBM Mode Idle Standby Dial Backup Menu Selection Effect Bkup Dial out, establish, and switch to dialed link (Dial Backup mode). Dial Dial out and establish dialed link (Standby mode). The data is routed over the DDS circuit. Disc Disconnect dialed link (Idle mode). →Dial Switch data to dialed link (Dial Backup mode). DrBU Disconnect dialed link and switch to DDS (Idle mode). →DDS Switch data to DDS (Standby mode).
COMSPHERE 3600 Series Data Service Units For a DSU configured as a central-site bridge with configuration option Bridge Rate set to =DDS, one of the following two screens appears: DBM : Brdg with DDS Bkup F1 F2 F3 DBM : Brdg w/o DDS DrBU F1 F2 F3 For a DSU configured as a central-site bridge with configuration option Bridge Rate set to =DSU, the following screen is displayed.
DSU Operations Abort The DBM must be in Idle mode or Disconnect mode, with no call in progress. The Abort selection allows you to terminate a test that is running. When a test is running, the DBM is in Test mode and is not allowed to run any other test. To access the Abort selection from the top-level menu, make the following selections: The Device Test is a 15- to 20-second test that does not require any connection except ac power to the DSU.
COMSPHERE 3600 Series Data Service Units If the DSU, TDM or MCMP (MUX), or DBM fails the test, the second line displays Fail instead of Pass. Also, the Alarm (Alrm) status indicator lights and the failure is reported in the DSU’s Health and Status. The Alarm indicator remains lit and the failure continues to be reported until the Device Test ends with a Pass in all categories (DSU, MUX, DBM). Until then, you can proceed but be aware that the DSU may not function properly. Figure 5-4.
DSU Operations Loopback Local loopback is used with the DTE test after the DSU passes the Device Test. The Loopback (Lpbk) branch displays four loopbacks: If you issue a Local Loopback to a tributary DSU, the DSU must have a DBM installed or you will get a Conflict w/ Environ message. Use the DBM to abort the Local Loopback by calling the tributary DSU.
COMSPHERE 3600 Series Data Service Units While the DSU is in Local Loopback, any data transmission by the DTE is returned as received data. An operator can send a test pattern and verify correct reception of the test. The DSU does not monitor this testing. Local Loopback can also be initiated by the DTE attached to Port 1 by raising Pin 18 of the EIA-232-D/ V.24 interface or Pin L of the V.35 interface, provided the Local Loopback by DTE configuration option is enabled.
DSU Operations DTE Loopback Results DTE Loopback (DTE) loops back the data path at the DTE/DCE interface on a per port basis without affecting the operation of the remaining ports (Figure 5-6). A message appears regarding successful loopback execution. The test result is a message telling you whether or not the loopback executed successfully. To access the DTE Loopback from the top-level menu, make the following selections: The DSU with TDM or MCMP only permits one test to be active at a time.
COMSPHERE 3600 Series Data Service Units Digital Loopback requires a dialed connection to another DBM. DTE connections to the DBMs are not required. Digital Loopback (DL) is used for manual testing of the remote end of the circuit. For example, a remote Digital Loopback may be required in order to complete an external Bit Error Rate Test (BERT) from the remote DSU. The local DSU receives test data, loops it back to the transmitter before the DTE interface, and returns it to the network (Figure 5-7).
DSU Operations Selecting Aggr (Aggregate) loops back the user-transmitted data and the secondary channel transport data (if nondisruptive diagnostics are in effect). This disrupts secondary channel transport communications. Selecting Prt1 (Port 1) causes the loopback to occur at a point where the secondary channel transport has already been extracted from the user-transmitted data, so only the user-transmitted data is looped back. Secondary channel communications are preserved.
COMSPHERE 3600 Series Data Service Units Remote Digital Loopback NOTE Remote Digital Loopback (RL) is typically used to support testing by an external device, such as a protocol analyzer connected to the local DSU’s DTE interface. A test message from the external device is looped back from the receiver to the transmitter in the remote DSU and returned to the local DSU (Figure 5-8).
DSU Operations In a point-to-point network only, Remote Digital Loopback can also be initiated by the DTE by raising Pin 21 of the EIA-232-D/V.24 interface or Pin N of the V.35 interface, provided the Remote Digital Loopback by DTE (RL by DTE) configuration option is enabled. When testing a DBM, the DBM must be in Dial Backup mode to realize this capability.
COMSPHERE 3600 Series Data Service Units Bilateral Loopback NOTE Bilateral Loopback, shown in Figure 5-9, is a combination of DTE and Digital Loopbacks operating simultaneously in the same DSU. Bilateral Loopback or Digital Loopback is a customer-selectable configuration choice (see the General Configuration Option Table in Chapter 6 of the COMSPHERE 3600 Series Data Service Units, Models 3610 and 3611, Operator’s Guide).
DSU Operations Digital Test NOTE Digital Test (DT) is used to check the functionality of a pair of DSUs or DBMs and the data circuit between the pair. The local DBM transmits the 511-bit test pattern over the network to the remote DBM for an operator-specified length of time (Figure 5-10). The remote DBM receives the test pattern and loops it back to its transmitter before the DTE interface, and returns it to the local DBM. The test pattern is then passed to the DSU’s comparator to be checked for errors.
COMSPHERE 3600 Series Data Service Units Figure 5-10.
DSU Operations Results When the message Command Complete is displayed, any key except the key returns you to the Digital Test submenu, where the Dsply and Clr selections appear. If Clr is selected while the test is running, the test starts again. DBM DT: Final Err Secs: F1 F2 F3 If the test is still running, the top line displays Active instead of Final, and the results are updated in real time. Table 5-6 defines the information displayed after a Digital Test is completed.
COMSPHERE 3600 Series Data Service Units Figure 5-11. End-to-End Test Results When the message Command Complete is displayed, key returns you to the End-toany key except the End Test submenu, where the Displ and Clr selections appear. When the test is over, the top line displays Final instead of Active. Table 5-7 shows the information provided by an End-to-End Test.
DSU Operations Bit Error Rate Test The Bit Error Rate Test (BERT) is a sessiondisruptive test used to analyze the network circuit. This test requires network connection to the control and tributary DSUs or DBMs. A DTE connection to the remote DBM may be required. The originating DBM sends a continuous 511-bit test pattern from its test pattern generator (Figure 5-12) transmitting via the DDS circuit for the DSU test and via the dial circuit for the DBM test.
COMSPHERE 3600 Series Data Service Units Figure 5-12.
DSU Operations Lamp Test The Lamp test is a test of the status indicators (LEDs) on the DSU’s DCP (both models), and the LCDs on the Model 3610 DCP and the SDCP. When the Lamp test is performed on the Model 3611, the alarm output is activated as well. Any indicator that does not flash is not functional, unless the circuit card is a non-modular TDM or MCMP. In this case, the Alrm and OK LEDs do not flash.
COMSPHERE 3600 Series Data Service Units Options The Options (Opts) submenu allows you to save, copy, and/or change configuration options. A DBM-V, DBM-S, or DBM-D can initiate a backup call using one of the following setup methods: fully automatic backup, partially automatic backup, or manual backup.
DSU Operations The Load from submenu displays the following selections: SAVE DSU The Setup selection displays the first configuration option in the Setup option set, MUX Funct, which is shown below and which selects the DSU-TDM’s or DSU-MCMP’s mode of operation.
COMSPHERE 3600 Series Data Service Units Figure 5-13 maps mode of operation to the applicable Configuration Option Tables (refer to Chapter 6 of the COMSPHERE 3600 Series Data Service Units, Models 3610 and 3611, Operator’s Guide for these tables). These tables are arranged by option set and presented in menu tree order. They describe the function or purpose of each configuration option in the set and describe each possible selection.
DSU Operations Figure 5-13.
COMSPHERE 3600 Series Data Service Units Table 5-9 Complete List of MUX Setup Configuration Options Mode of Operation Option F nction Function TDM MCMP Bridge MUX Funct Select mode of operation: TDM, MCMP, Bridge (CBrdg or EBrdg) or Basic (None). X X X Bridge Rate Select bridge port speed; all active ports on the digital bridge are set to this speed. Ignored Ignored X Brdg Timing Select where timing will be taken from during backup in Bridge mode.
DSU Operations Port Option Sets To access the Copy from menu, The Prt1 through Prt6 selections allow configuration options to be set on a per-port basis for TDM, MCMP, or Bridge mode. Change MUX Opts: Copy Setup Prt1 In TDM or MCMP mode, the Prt1 through Prt6 selections are available. In Bridge mode, the Prt2 through Prt6 selections are available; selections for Prt1 are set via the DSU and Gen submenus (option sets).
COMSPHERE 3600 Series Data Service Units Table 5-10 (1 of 2) Complete List of MUX Port Configuration Options Mode of Function Option F nction Function TDM MCMP Bridge Async→Sync Configure the port as asynchronous or synchronous. X X1 Forced to Disab Async Rate Select an asynchronous rate for the port. X X1 Ignored AsyncBit/ Char Specify the length of the asynchronous character, including the parity bit but excluding the start and stop bits.
DSU Operations Table 5-10 (2 of 2) Complete List of MUX Port Configuration Options Function Option Mode of Function DSR Frc On Enable port DSR lead to remain ON as long as the DSU is working, regardless of tests and network alarms. X X X DSR on Tst Specify when the port DSR lead is turned ON or Off during testing. X X Forced Off Extend Chan Specify whether an extended network has main channel connectivity during a test condition.
COMSPHERE 3600 Series Data Service Units If in MCMP mode, the following is displayed: Press the When PList is selected, four selections are displayed, unless the MCMP option is installed, in which case, there are five selections. Table 5-11 lists the PList selection options and their function. Chang Prt Speed: DSU Chan F1 F2 key to scroll other selections into view. F3 Table 5-11 Poll List Menu Options Select the option set to be edited or changed.
DSU Operations The Add command is executed. A message is sent to the control DSU asking that the tributary be added to the polling list. The control DSU responds by acquiring the tributary DSU onto its polling list. Acquir Poll List: Command Complete F1 Acquiring the Poll List • Determines which tributaries are present on the network. • Determines the roundtrip delay to each tributary.
COMSPHERE 3600 Series Data Service Units Table 5-12 Directory Entry and Password Characters Character 1 Use 0—9 Dialing digit (These are the only characters accepted by the Switched 56 DBM.) * Tone-dialing character * # Tone-dialing character # t Tone dial 2 p Pulse dial 2 w Wait for dial tone 2 Delimiter, separating telephone number and callback directory pointer (for use with callback security).
DSU Operations Control Branch When in Bridge mode, the following selections appear: The Control (Ctrl) branch allows you to enable or disable the DSU’s transmitter, as well as the DBM’s, and to display/change the status of the general purpose external DTE leads.* For a DSU operating in TDM or MCMP mode, the Control branch allows the transmitter to be enabled or disabled on a per-port basis. It also allows you to choose which of the six ports is to have its circuit leads monitored.
COMSPHERE 3600 Series Data Service Units Transmitter Control When in TDM or MCMP mode, the following selections appear: Transmitter Control (TxCtl) allows you to enable or disable the DSU’s transmitter (DDS core), the DBM’s transmitter (the DBM’s call setup and answering capability), or to enable or disable individual ports when operating in TDM or MCMP mode. You can also choose which of the six ports is to have its circuit leads monitored.
DSU Operations LEDs P r t 2 : Enable Enab Disab F1 F2 The LEDs selection is only available from the Local branch. This selection allows you to monitor any of the TDM or MCMP ports at any given time. When a port is selected, its lead activity is reflected in the DCP circuit designation status indicators (TXD, RXD, etc.). The LEDs on the TDM or MCMP circuit card show which ports are being monitored when the TDM or MCMP mode is in operation. You can also choose to monitor the aggregate data stream.
COMSPHERE 3600 Series Data Service Units When in TDM or MCMP mode, the selections are 1, 2, 3, 4, 5, 6, or Aggr. Aggr is the communications interface between the aggregate data path (on the TDM or MCMP circuit card) and the DSU. In Bridge mode, the selections are 1, 2, 3, 4, 5, 6, or DCE. DCE is the communications interface between Port 1 (on the TDM or MCMP circuit card) and the DSU; Port 1 is the aggregate link to the DTE, while Ports 2 through 6 may be connected to DBM-Vs, DBM-Ss, or DBM-Ds.
Data Service Unit Menu 3610-A2-GB41-60 March 1999 A A-1
COMSPHERE 3600 Series Data Service Units A-2 March 1999 3610-A2-GB41-60
Data Service Unit Menu 3610-A2-GB41-60 March 1999 A-3
COMSPHERE 3600 Series Data Service Units A-4 March 1999 3610-A2-GB41-60
Configuration Worksheets B Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1 Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1 Overview This appendix contains a complete set of Configuration Worksheets used for the 3600 Series DSU and its options.
COMSPHERE 3600 Series Data Service Units This page intentionally left blank.
Configuration Worksheet for TDM Mode (1 of 3) j Date:________________________________________________ Location:_____________________________________________ Local Phone Number: ( Device:______________________________________________ Local Address:________________________________________ Serial No.
Configuration Worksheet for TDM Mode (2 of 3) Prt6 Options Value Async→Sync Enab, Disab Async Rate =Sync, 1800, 1200, 600, 300, 150 AsyncBit/Char 6, 7, 8, 9, 10 Stop Bits 1, 2 Overspeed 1.25, 2.5 RTS Cntrl FrcOn, DTE TxCarrSel Const, Cntrl RxCarrSel Const, Cntrl, Mark PCC Buffer Enab, Disab Elast Stor Enab, Disab RTS/CTS Del (Chang) DTR Alarm Antistream 0–1040 ms (8 ms increments) PrtSp Options (DBM) Value (Chang) Disab, 1–100 sec ) 56, 48, 38.4, 32, 28.8, 19.2, 18.0, 16.
Configuration Worksheet for TDM Mode (3 of 3) DBM Options Value Backup Directory Dial String General Options Value Rate(Kbps) { 14.4, 12.0, 9.6, 4.8, 2.4 1 DTE Port*** EIA232, V.
Configuration Worksheet for MCMP Mode (1 of 3) j Date:________________________________________________ Location:_____________________________________________ Local Phone No.: ( Device:______________________________________________ Local Address:_________________________________________ j DBM Installed Serial No.
Configuration Worksheet for MCMP Mode (2 of 3) Prt6 Options Async→Sync Value Enab, Disab Async Rate =Sync, 1800, 1200, 600, 300, 150 AsyncBit/Char 6, 7, 8, 9, 10 Stop Bits 1, 2 Overspeed 1.25, 2.5 RTS Cntrl FrcOn, DTE TxCarrSel Const, Cntrl RxCarrSel Const, Cntrl, Mark PCC Buffer Enab, Disab Elast Stor Enab, Disab RTS/CTS Del (Chang) DTR Alarm Antistream 0–1040 ms Prt2 Disab, 1–100 sec ( ) 48, 38.4, 19.2, 18.0, 16.8, 14.4, 12.0, 9.6, 7.2, 4.8, 2.4, 1.2, Disab ) 48, 38.4, 19.
Configuration Worksheet for MCMP Mode (3 of 3) General Options Value Backup Options Value Backup Directory DTE Port* EIA232, V.
Configuration Worksheet for Bridge Mode (1 of 2) j Date:________________________________________________ Location:_____________________________________________ Local Phone No.: ( Device:______________________________________________ Local Address:_________________________________________ j DBM Installed Serial No.
Configuration Worksheet for Bridge Mode (2 of 2) General Options DTE Port Value EIA232, V.
Configuration Worksheet for Basic Mode j Date:_______________________________________________ Location:____________________________________________ Local Phone No.: ( Device:_____________________________________________ Local Address:________________________________________ Serial No.
Configuration Worksheet for Basic (DBM-V, DBM-S, or DBM-D) j Date:________________________________________________ Location:_____________________________________________ Local Phone No.: ( Device:______________________________________________ Local Address:_________________________________________ Serial No.
Pin Assignments C Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1 • Figure C-4 shows the V.35 adapter that is used with the standalone TDM/DSD, MCMP/DSD, TDM/Flex, or MCMP/Flex models. Table C-6 provides its pin assignments. Overview The pin assignments for the 3600 Series TDM and MCMP connectors and interfaces are included in this appendix. Refer to them as needed.
COMSPHERE 3600 Series Data Service Units Figure C-1.
Pin Assignments Table C-1 (2 of 3) Time Division Multiplexer Connector Used with Non-Modular TDM 60-Position High-Density Connector 1 J2 = P1 Pin Port 1 Pin 16 J2 20 17 J2 24 18 J3 07 19 J2 04 20 J5 02 21 J5 08 22 J2 12 23 J5 04 24 J6 07 25 J6 08 26 J6 06 27 J6 17 28 J6 03 29 J6 12 30 J4 07 31 J4 17 32 J4 02 33 J4 04 34 J4 05 35 J4 03 36 J4 15 37 J4 12 38 J4 24 39 J4 20 40 J3 15 41 J3 02 42 J4 06 43 J5 03 44 J5 15 4
COMSPHERE 3600 Series Data Service Units Table C-1 (3 of 3) Time Division Multiplexer Connector Used with Non-Modular TDM 60-Position High-Density Connector 1 J2 = P1 Pin Port 1 Pin 46 J2 06 47 J2 17 48 J2 05 49 J2 03 50 J5 06 51 J5 05 52 J5 17 53 J5 24 54 J5 20 55 J6 15 56 J6 05 57 J6 02 58 J6 04 59 J6 20 60 J6 24 Port 2 J3 = Port 3 J4 = Port 4 C-4 25-Position Socket D-Sub J5 = Port 5 J6 = Port 6 March 1999 3610-A2-GB41-60
Pin Assignments Figure C-2.
COMSPHERE 3600 Series Data Service Units Table C-2 (2 of 3) Digital Bridge Connector Used with Non-Modular TDM/MCMP 60-Position High-Density Connector 1 J2 P1 Pin Port 1 Pin 14 P2 03 15 NC2 NC2 16 P2 06 17 P2 17 18 P3 07 19 P2 08 20 P5 03 21 P5 04 22 NC2 NC2 23 P5 08 24 P6 07 25 P6 04 26 P6 20 27 P6 24 28 P6 02 29 NC2 NC2 30 P4 07 31 P4 24 32 P4 03 33 J4 08 34 NC2 NC2 35 P4 02 36 NC2 NC2 37 NC2 NC2 38 P4 17 39 P4 06 40 NC2
Pin Assignments Table C-2 (3 of 3) Digital Bridge Connector Used with Non-Modular TDM/MCMP 60-Position High-Density Connector 1 J2 P1 Pin Port 1 Pin 45 NC2 NC2 46 P2 20 47 P2 24 48 NC2 NC2 49 P2 02 50 P5 20 50 P5 20 51 NC2 NC2 52 P5 24 53 P5 17 54 P5 06 55 NC2 NC2 56 NC2 NC2 57 P6 03 58 P6 08 59 P6 06 60 P6 17 = Port 2 J3 = Port 3 J4 = Port 4 2 NC = No Connection 3610-A2-GB41-60 25-Position Plug D-Sub J5 = Port 5 J6 = Port 6 March 1999 C-7
COMSPHERE 3600 Series Data Service Units Figure C-3.
Pin Assignments Table C-3 60-Position High-Density Connector (TDM/MCMP Ports 2 through 6 for Model 3611 DSU) Pin (Ports 2 – 6) 1 2 3 F nction Function 2 3 4 5 6 EIA-232 2 CCITT 14 41 32 20 57 BA 103 Transmit Data (TXD) 49 13 35 43 28 BB 104 Received Data (RXD) 19 9 33 23 58 CA 105 Request-to-Send (RTS) 48 1 34 51 56 CB 106 Clear-to-Send (CTS) 46 4 42 50 26 CC 107 Data Set Ready (DSR) 8 18 30 12 24 AB 102 Signal Ground (SG) 11 3 10 21 25 CF 109
COMSPHERE 3600 Series Data Service Units Table C-4 EIA-232-D/V.24 Connector (Port 1) Circuit Name Pin F nction Function EIA-232-D CCITT/V.
Pin Assignments Table C-5 V.35 Connector (Port 1) Circuit Name Pin(s) F nction Function V.35 CCITT B AB 102 Signal Ground (SG) P, S BA 103 a, b Transmit Data (TXD) R, T BB 104 a, b Received Data (RXD) C CA 105 Request-to-Send (RTS) D CB 106 Clear-to-Send (CTS) E CC 107 Data Set Ready (DSR) F CF 109 Received Line Signal Detect (LSD) H CD 108.
COMSPHERE 3600 Series Data Service Units 99-16294 Figure C-4. Modular DSU V.
Pin Assignments Table C-6 Model 3610 (Ports 2 – 6) and Modular DSU 25-Pin V.35 Connector 25-Pin Connector (Model 3610 Ports 2 – 6) 34-Pin Connector (Modular DSU V.
COMSPHERE 3600 Series Data Service Units Figure C-5.
Pin Assignments Table C-7 EIA-232/V.24 TDM/MCMP Connector (Modular and Standalone – Ports 2 through 6) Circuit Name Pin 1 2 F nction Function EIA-232 1 CCITT/V.
COMSPHERE 3600 Series Data Service Units Figure C-6. 6-Port V.
Pin Assignments Table C-8 6-Port V.35 Interconnect Cable Connector 26-Pin Connector (Connector Module) 34-Pin Connector (6-port V.
COMSPHERE 3600 Series Data Service Units C-18 March 1999 3610-A2-GB41-60
Configuration Scenarios Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TDM Configuration Scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TDM Scenario 1 – Using Two Synchronous Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TDM Scenario 2 – Using Switched 56 kbps Dial Backup . . . . . . . . .
COMSPHERE 3600 Series Data Service Units TDM Scenario 1 – Using Two Synchronous Channels NOTE In this appendix, full backup indicates that in order to operate, all remote devices must switch data to backup lines when one or more tributaries require backup. Partial backup indicates that only affected remote devices will switch data to backup lines when the DDS line is lost to the tributary site; all other devices continue to operate over the DDS line.
Configuration Scenarios • DSU Configuration Options For TDM scenario 1, use the Configuration Worksheet for TDM Mode and set the configuration options that follow for both the control and tributary DSU-TDMs. • MUX – Setup Rate(Kbps): 9.
COMSPHERE 3600 Series Data Service Units • MUX – Setup TDM Scenario 2 – Using Switched 56 kbps Dial Backup In this configuration, shown in Figure D-2, the Switched 56 DBMs provide the capability for full backup of a TDM circuit operating at 56 kbps. (If the DDS circuit operates at less than 56 kbps, the Switched 56 DBM uses rate adaption to match the DDS speed.) For this scenario, the DSU supports three applications running at 4.8 kbps, 9.6 kbps, and 19.2 kbps.
Configuration Scenarios • DBM • PrtSp – DBM AutoAnswer: Enab Call Setup: Pswrd RxPwd: enter received password TxPwd: enter transmit password V.13 Signl: Disab Dial Test: Enab Primary Core: No DTRCallCon: Disab Prt1: 4.8 Prt2: 9.6 Prt3: 19.2 Prt4 through Prt6: Disab • DSU Rate(Kbps): 56 TxClkSource: DDS Msg Clamp: Enab AggrSwitch: Disab V.
COMSPHERE 3600 Series Data Service Units • The control and tributary DSUs are configured for mixed diagnostics. Digital Bridge Configuration Scenarios The following scenarios describe four possible backup processes, which are used in typical customer networks: automatic partial backup, multipoint dial backup with tributary digital-sharing device, and network management controlled backup. Read these scenarios; each contains descriptions that are common to many applications.
Configuration Scenarios When 1 minute elapses, the two tributary DSUs (Figure D-4) instruct their DBMs to place a call to their respective DBM-Vs at the central site. (Each tributary DSU-DBM has been paired with a DBM-V that is associated with the control DSU-digital bridge at the central site. The tributary’s Backup Dir configuration option is a pointer to the telephone number stored in its Backup Directory for its associated DBM-V; each DBM calls a different DBM-V.
COMSPHERE 3600 Series Data Service Units Full Backup If the fault is with the central-site bridge’s local loop ( a No Signal or a Bipolar Violation alarm is reported for the central-site bridge ), the central-site bridge must be placed in Backup mode to eliminate problems with clock slippage (Figure D-5). This can be done from the SDCP by selecting Bkup, or from the NMS by issuing the Standby Facility ( sf) command and entering originate in the Standby Facility State field.
Configuration Scenarios Configuration Options Set the central-site bridge configuration options as follows (Configuration Worksheet for Bridge Mode) Set configuration options for automatic partial backup using the DBM-V as follows (Configuration Worksheet for Basic (DBM-V, DBM-S, or DBM-D) Mode): • Diag – DBM • MUX – Setup Diag Type: Disr RemoteDiag: Enhan MUX Funct: CBrdg Bridge Rate: =DSU Brdg Timing: Int Share DevA: Enab Lowest Port#: DCE # Ports in Gp: 4 Port Cntrl: Host Share DevB: Disab • Diag –
COMSPHERE 3600 Series Data Service Units • Bkup Set the configuration options for automatic partial backup of the tributary DSU as follows (Configuration Worksheet for Basic Mode): Auto Bckup: Enab Backup Dir: enter Dir number (1 to 10) BckupOnCMI: Enab AutoRestor: Enab NtwkTimOut: enter 1 minute RestorTimOut: enter 5 minutes TriesTimOut: enter 1 minute MultiCall: Disab • DSU Rate(Kbps): 9.6 PrtSp(Kbps): 9.
Configuration Scenarios Figure D-6. Multipoint Full Dial Backup with Nondisruptive Diagnostics Configuration If a network failure occurs so that the multipoint drops are lost, the 6800 Series NMS will display a Tributary Time-out alarm for the tributary DSUs, and a Facility Alarm for the control DSU.
COMSPHERE 3600 Series Data Service Units To end the backup session via the NMS, issue disconnect commands to the control DSU and all its DBM-Ss.
Configuration Scenarios • DBM • Bkup Auto Bckup: Disab BckupOnCMI: Disab AutoRestor: Disab Set the configuration options for multipoint dial backup of a tributary DSU-DBM configuration as follows (Configuration Worksheet for Basic Mode): • DSU Rate(Kbps): 56 PrtSp(Kbps): 56 TxClkSource: DDS AggrSwitch: Disab PrtSp(Kbps): 56 AutoAnswer: Enab TxElasStor: Disab RxElasStor: Disab Call Setup: Pswrd RxPwd: enter received password TxPwd: enter transmit password V.
COMSPHERE 3600 Series Data Service Units Automatic Partial Backup Using an Extended Bridge NMS displays a Facility Alarm for the control DSU and a Tributary Time-out alarm for each tributary DSU and DBM.
Configuration Scenarios Figure D-7.
COMSPHERE 3600 Series Data Service Units Figure D-8.
Configuration Scenarios Figure D-9.
COMSPHERE 3600 Series Data Service Units During the backup session, each pair of communicating DBMs (the DBM-V and its tributary DBM) and the DDS network are active on the bridge. When the DDS network is restored, each tributary DSU drops its network alarm. After the 5-minute restoration interval has elapsed, the DSU switches back to the DDS network, and the remote DTE then receives its polls from the host over the DDS network.
Configuration Scenarios Set the extended bridge configuration options as follows (Configuration Worksheet for Bridge Mode): • MUX – Setup MUX Funct: EBrdg Bridge Rate: 9.
COMSPHERE 3600 Series Data Service Units Figure D-10.
Configuration Scenarios Figure D-11.
COMSPHERE 3600 Series Data Service Units As a result of a network failure in the backbone DDS network, the control DSU reports a facility alarm to the NMS. The operator at the NMS workstation is alerted by the alarm, and examines the circuit’s network map or circuit profile to see if backup is possible. Supplementary information about the network addresses of the DBM-Vs (that are dedicated to the bridge) and their remote DBM telephone numbers should also be in the circuit profile.
Configuration Scenarios Configuration Options Set the extended bridge configuration options as follows (Configuration Worksheet for Bridge Mode): Set the central-site bridge configuration options as follows (Configuration Worksheet for Bridge Mode): • MUX – Setup • MUX – Setup MUX Funct: EBrdg Bridge Rate: 14.4 Brdg Timing: Prt1 Share DevA: Enab Lowest Port#: 2 # Ports in Gp: 3 Share DevB: Disab MUX Funct: CBrdg Bridge Rate: 14.
COMSPHERE 3600 Series Data Service Units Set configuration options for multipoint full dial backup using the DBM-V as follows (Configuration Worksheet for Basic (DBM-V, DBM-S, or DBM-D) Mode): Set the configuration options for multipoint full dial backup of a tributary DSU as follows (Configuration Worksheet for Basic Mode): • DSU • Diag – DBM Rate(Kbps): 56 PrtSp(Kbps): 56 TxClkSource: DDS AggrSwitch: Disab Diag Type: Disr RemoteDiag: Enhan • Diag – Gen • Diag – DSU Position: Cntrl LinkConfig: M-Pt
Configuration Scenarios Configuration Options MCMP Configuration Scenarios There are three different MCMP scenarios described in this section: one FEP port-sharing scenario and two dial backup scenarios. Set the FEP port sharing configuration options for the control and tributary DSU-MCMPs as follows (Configuration Worksheet for MCMP Mode): MCMP Using FEP Port Sharing The 3600 Series DSUs with MCMP capability are targeted towards financial services and information processing customers.
COMSPHERE 3600 Series Data Service Units Figure D-12.
Configuration Scenarios • The extended bridge is configured to operate at 56 kbps, automatically taking its timing from any port, and configured for digital-sharing with two ports in the digital-sharing group, Prt2 being the lowest-numbered port. It is also configured for Host contention. Dedicated MCMP Backup with Switched 56 DBMs This scenario describes the Switched 56 kbps dial backup of an MCMP circuit (Figure D-13).
COMSPHERE 3600 Series Data Service Units Next, send a dial command, followed by a Dial Mode (dm) command to each of the DBM-Ss performing backup. (A routine command can be created to issue the command sequence automatically.) Each DBM-S responds by dialing a tributary Switched 56 DBM. When connected, the pair of DBMs handshake and exchange passwords, and enter Data mode (ready to send data).
Configuration Scenarios • Diag – Gen Position: Cntrl for control; Trib for tributary LinkConfig: M-Pt Set configuration options for automatic partial backup using the tributary Switched 56 DBMs, DBM-Ss, or DBM-Ds as follows (Configuration Worksheet for Basic (DBM-V, DBM-S, or DBM-D) Mode): • Gen • Diag – DBM DTE Port: EIA232 RTS Control: FrcOn Diag Type: Disr RemoteDiag: Enhan • Bkup • Diag – Gen Auto Bckup: N/A for control; Disab for tributary AutoRestor: N/A for control; Disab for tributary Posi
COMSPHERE 3600 Series Data Service Units MCMP Backup Using FEP Port Sharing This configuration provides backup of two to three channels (Figure D-14). When the remote DBM dials into the control DBM-Vs, the remote DBM automatically reverts to TDM mode and adjusts its port speeds when the dial backup speed is less than the MCMP aggregate speed (Figure D-15). Port speeds are adjusted using the DBM port speed options.
Configuration Scenarios • If all tributary DSUs are out of service, the control MCMP will have an Out-of-Frame alarm. • If a tributary is in Backup mode and the network problem has been fixed, the only commands that can be sent to the tributary from the control MCMP are aggregate tests (e.g., the End-to-End test or Digital Test).
COMSPHERE 3600 Series Data Service Units • Diag – Gen • Prt2 and Prt4 (Prt6 N/A) Position: Cntrl for control; Trib for tributary LinkConfig: M-Pt Async→Sync: Disab for control; N/A for tributary TxCarrSel: Const for control; N/A for tributary RxCarrSel: Const for control; N/A for tributary Elast Stor: Disab for control; N/A for tributary • DBM Rate(Kbps): N/A for control; 14.
Configuration Scenarios Set configuration options for automatic partial backup using the DSU-DBM-TDM as follows (Configuration Worksheet for TDM Mode): • MUX – Setup • Diag – DSU Diag Type: NonD 2nd Ch(bps): 40 Disr Type: 3600e • Diag – Gen MUX Funct: TDM Share DevA: Disab Share DevB: Disab P1/2 FEP Sh: Enab P3/4 FEP Sh: Enab P5/6 FEP Sh: Disab Position: Cntrl LinkConfig: Pt-Pt • DBM Rate(Kbps): N/A for control; 14.
COMSPHERE 3600 Series Data Service Units D-34 March 1999 3610-A2-GB41-60
Index A B abort, 5-15 adapter, V.
COMSPHERE 3600 Series Data Service Units configuration branch, 5-7, 5-31 options, 3-4 mode of operation, 5-35 MUX, 5-32 MUX port, 5-38 MUX setup, 5-36 port speed, 5-39 setting, 5-35 scenarios, TDM, D-2 software DCP, 2-10 NMS, 2-10 worksheets, B-1 connector cable, V.35 interconnect, 6-port, C-17 EIA-232/V.24, modular, standalone, C-15 EIA-232-D/V.24, port 1, C-10 high density, ports 2 - 6, model 3611, C-9 module, 6-port, C-14 non-modular carrier mounted, circuit card, C-8 digital bridge, C-5 TDM, C-2 V.
Index digital bridge, 1-3, 4-35 active, 4-45 broadcast, 4-37 capability, 1-5 configuration scenarios, D-6 connector, C-5 nonĆmodular TDM/MCMP, CĆ5 DBM-V/DBM-S/DBM-D interface, 4Ć46 switched LSD operation, 4Ć46 DCE, interface, 4-33 DSU interface, 4-52 inactive, central-site bridging, 4-44 interface cable, C-5 multipoint, 4-35 loopback, 5-20 remote, 5-22 sharing, 1-3, 1-4, 4-11, 4-12, 4-13, 4-58 device, DSD, 2-1 MCMP, 4-26, 4-27 LPDAĆ2 monitoring, 4Ć61 multiple DTEs, 4-54 multiplexing, 4-13 multipoint circui
COMSPHERE 3600 Series Data Service Units E G EIA-232/V.24, TDM/MCMP, connector, modular/standalone, C-15 EIA-232-D/V.
Index multiplexing, 4-56, 4-57 operation, 4-25 overhead composition, 4-23 signal flow, 4-24 status indicators, 5-5 menu mode, of operation, 5-7 options control branch, 5-43 poll list, 5-40 selections, backup branch, 5-13 structure, 5-7 mode basic, 4-4, 5-33 bridge, 4-4, 5-33 configuration options, 5-35 idle, 5-12 MCMP, 4-4, 5-33 standby, 5-12 TDM, 4-4, 5-33 model 3610 DSU with TDM/MCMP, 2-9 modular, pin connector, ports 2 - 6, C-13 switch locations, 2-3 with SNA Diagnostic Interface, 1-6 with TDM or MCMP,
COMSPHERE 3600 Series Data Service Units multiplexing digital sharing, 4-13 MCMP, 4-57 point-to-point, 4-5, 4-10 TDM, 4-57 time division, 4-5 multipoint async compatibility, 4-9 async compatible, 4-9 network, 4-9 backup, 4-38 addressing, 4-40 architecture, 4-42 circuit digital sharing, 4-59 MCMP, 4-22 DDS circuit, partial backup, 4-39 dial backup, 4-56 LPDA-2, 4-56 digital bridge, 4-35 full backup, nondisruptive diagnostics, D-10 multichannel, 4-21 transmission, 4-3 drop, 4-3 multispeed, operation, 1-5 MUX
Index speeds channel, 4-23 characteristics, 4-6 line, 4-23 standard, features, 1-2 status branch, 5-7, 5-8 codes, DTE lead, 5-10 indicators, 5-3 DBM-V/DBM-S/DBM-D, 5-6 DSU, TDM/MCMP, 5-6 TDM/MCMP, 5-5 subbranches, 5-7 subnetwork, 5-15 health and status, 5-10 switch aggregate, 5-13 flex interface, 2-6 switch locations model 3610, 2-3 model 3611, 3-3 modular, TDM/MCMP, 3-4 switched 56 DBM backup, 4-19 dedicated MCMP, 4Ć28 dedicated MCMP, D-27 carrier emulation, 1-3, 1-4, 4-25 LSD operation, 4-46 synchronous,
COMSPHERE 3600 Series Data Service Units status indicators, 5-5 synchronous channels, D-2 TDM/MCMP adding flex model 3610, 2-13 model 3611, 3-6 connector, EIA-232/V.
