Telenetics 2185 Digital Bridge User Guide
Notice 2001 Telenetics Corporation 25111 Arctic Ocean Lake Forest, California 92630 (949) 455-4000 All rights reserved Printed in U.S.A. Proprietary Material Information and software in this document are proprietary to Telenetics Corporation (or its Suppliers) and without the express prior permission of an officer of Telenetics Corporation, may not be copied, reproduced, disclosed to others, published, or used, in whole or in part, for any purpose other than that for which it is being made available.
Notice (cont’d) Warning This equipment does not exceed the Class A limits for radio noise interference emissions from digital apparatus as specified in the radio interference regulations of the Canadian Department of Communications.
Contents Chapter 1, Introduction Introduction ..................................................................................... 1-1 2185 FEATURES ............................................................................ 1-1 Data Interface ............................................................................ 1-1 Main Channel Broadcast ........................................................... 1-2 Subchannel Contention ..............................................................
Telenetics 2185 Chapter 4, Operation and Configuration Maintenance Philosophy ................................................................. 4-1 Preventive Maintenance ............................................................. 4-1 Corrective Maintenance ............................................................. 4-1 Recovery from Anti-Streaming Alarm Condition ..................... 4-1 Returning Defective Equipment for Repair .................................... 4-2 General Packing Information ....
Chapter 1 Introduction INTRODUCTION Your Telenetics 2185 is a digital bridge that can connect up to five subchannel devices to a single main channel device. Sharing computer and communications resources through a 2185 can achieve significant savings in hardware and line costs. The 2185 is a versatile unit that can be used in both port-sharing and modem-sharing applications.
Telenetics 2185 Main Channel Broadcast Data received on the main channel is broadcast to all subchannels. In synchronous operation, the corresponding clock is also broadcast. DSR and DCD are sent to all subchannel DTE devices, and DTR and RTS to all subchannel DCE devices. Subchannel Contention Subchannels contend for use of the main channel to send data to the CPU, controller, or other device.
Telenetics 2185 phase, frequency, and the presence of jitter could cause the subchannel and the main channel to lose synchronization. If synchronization is lost, data errors occur and transmission fails. When the 2185 is configured for asynchronous operation, the retiming buffer is bypassed. Anti-Streaming Anti-streaming protects the network from becoming jammed if one of the subchannel devices fails.
Telenetics 2185 • When operating with control signal contention, the 2185 is transparent to the data stream. • When operating with data contention, subchannel data must be mark idle and 16 consecutive marks cannot appear in mid-message. The minimum data rate for an external clock is 50 bps. Port-Sharing Mode In the port-sharing mode, the 2185's main channel is connected directly to a CPU or controller port (DTE). Subchannel devices communicate with the 2185 via modem links.
Telenetics 2185 Modem-Sharing Mode In the modem-sharing mode, the CPU or controller is at a site remote from the 2185. The 2185's main channel connects to the CPU through a modem link (DCE). Subchannel terminals are connected directly to the 2185. Modem-sharing operation is illustrated in Figure 1-2. Figure 1-2.
Telenetics 2185 Co-Located Terminals Any combination of subchannel DTE devices and subchannel DCE devices is possible. For example, local subchannel terminals can be colocated with modes that communicate with devices at remote sites. Figure 1-3 shows an example of co-located terminals in the port-sharing mode. Co-location of ports and modems is also possible in the modemsharing mode. Figure 1-3.
Telenetics 2185 Figure 1-4.
Telenetics 2185 Two or more of the 2185s can be located at one site as shown in Figure 1-4. Alternatively, the units may be located at sites remote from each other, and connect via modems. See Figure 1-5. Figure 1-5.
Telenetics 2185 SPECIFICATIONS Table 1-1 summarizes 2185 specifications. Table 1-1. 2185 Specifications Data Rates Internally Generated 75,1200,2400,4800,7200,9600,14400,1920 0, bps (all ± 0.
Telenetics 2185 1-10
Chapter 2 Installation INTRODUCTION This chapter contains the information you need to install you Telenetics 2185. CUSTOMER RESPONSIBILITIES After delivery of your equipment and before installation, you are responsible for moving it to the installation site, unpacking and checking it for material shortages and/or damage, which may have occurred during shipment.
Telenetics 2185 UNPACKING Packing Materials Your 2185 is wrapped in re-usable, shock-absorbent packing material. Telenetics recommends that you keep this packing material and the shipping carton in case the unit must be stored, shipped, or returned to Telenetics for service. Check the contents of the package against the packing list for material shortages and inspect the unit, for physical damage, which may have occurred in shipment.
Telenetics 2185 INSTALLATION PROCEDURE Equipment Assembly The 2185 is shipped as a completely assembled unit with the printed circuit board and power supply sub-assemblies already installed.No further assembly is required. Installation Tools Required The only tool required is a small slot screwdriver to tighten the screws securing the interface cable connectors to the connectors on the unit's rear panel. Mechanical Installation The 2185 is a “tabletop” unit.
PORT 5 PORT 4 PORT 3 PORT 2 PORT 1 PORT 0 Figure 2-1. Rear Panel Assembly Note: The 2185 may have its main channel or any subchannel configured as DCE or DTE.Any necessary signal crossovers are performed internally.
Telenetics 2185 Note: The 2185 may have its main channel or any subchannel configured as DCE or DTE. Any necessary signal crossovers are performed internally. Figure 2-2. Straight-Through Cable Interface Figure 2-2 shows the straight-through cable signal interface. Be sure to tighten all connectors securely to ensure good mechanical connection, and to assure the integrity of the cable shield.
Telenetics 2185 2-6
Chapter 3 Operation and Configuration INTRODUCTION This chapter describes the 2185 operating controls and indicators, how to configure and operate your 2185 using these operating controls, and how to power-up and power-down the unit. Once configured, your 2185 operates unattended, without operator intervention. Occasional monitoring of the LED status indicators is recommended.
Telenetics 2185 Figure 3-2.
Telenetics 2185 FUNCTION SWITCHES The front-panel-mounted controls consist of three Dual In-line Package (DIP) function switches. Switch banks one and two contain eight individual switches and switch three contains six individual switches. The role of function switches one, two and three is summarized in Tables 3-1 through 3-5. The following paragraphs describe these functions in more detail.
Telenetics 2185 Switch segments 1-6 to 1-8 are used to set the data rate on the 2185. See Table 3-2 for information on setting these switches. Table 3-2.
Telenetics 2185 Table 3-3. Function Switch Two Summary Function Switch Switch Position Function 2-7 Up Down Sets main channel RTS or DCD transparent Straps main channel RTS or DCD ON 2-8 Up Down Straps main channel inbound CTS ON Sets main channel inbound CTS transparent In certain synchronous configurations, the internal clock generator is not used and the data rate is determined by the selected external clock source.
Telenetics 2185 With synchronous data transmission, the data retiming buffer must be used except when all subchannels are connected to DTE devices. The data retiming buffer may then be bypassed to permit passing Bisynchronous multiple messages in Data Contention mode. Switch Segment 2-4 — Anti-Streaming Enable/Disable • Switch 2-4 set to up position – Anti-Streaming Disabled • Switch 2-4 set to down position – Anti-Streaming Enabled Enabling Anti-Streaming limits a subchannel message to 25 seconds.
Telenetics 2185 Switch Segment 2-7 — Main Channel RTS/DCD Strapping • Switch 2-7 set to up position – RTS/DCD transparent • Switch 2-7 set to down position – RTS/DCD strapped ON When switch segment 2-7 is set for transparent RTS/DCD operation, the main channel outbound RTS or DCD signal is ON only when a subchannel is active. When switch segment 2-7 is set to the down position, the main channel RTS/DCD is strapped ON at all times.
Telenetics 2185 Figure 3-3.
Telenetics 2185 Figure 3-4.
Telenetics 2185 Figure 3-5.
Telenetics 2185 Figure 3-6.
Telenetics 2185 Figure 3-7.
Telenetics 2185 Figure 3-8.
Telenetics 2185 Function Switch Three Function switch three is a six-segment DIP switch used to configure the data interfaces for each channel. Set to Up (DTE) if the channel is connected to a DTE-type device such as a CPU port or a terminal (this configures the 2185 interface as Data Circuit-terminating Equipment - DCE). Set down (DCE) if the channel is connected to a DCE-type device such as a modem (this configures the 2185 interface as Data Terminal Equipment - DTE). Table 3-5.
Telenetics 2185 Digital Bridging Application Example One of the most common applications for your 2185 is as a digital bridge. In this instance, a 2185 is used to connect a large number of local and remote asynchronous terminals to a mainframe computer at a central site. Figure 3-9 shows this application. In this application, the main channel of the 2185 connects to a host computer through a front-end processor. The data rate is 9. 6 kbps and the format is synchronous.
Telenetics 2185 Figure 3-9.
Telenetics 2185 Table 3-6. Switch One Switch Segment Setting Reason 1-1 Down Enable Subchannel 1 1-2 Down Enable Subchannel 2 1-3 Down Enable Subchannel 3 1-4 Up Disable Subchannel 4 1-5 Up Disable Subchannel 5 1-6 Down 1-7 Up The settings of these three switches set the data rate (9. 6 kpbs) 1-8 Down Table 3-7.
Telenetics 2185 Table 3-8. Switch Three Switch Segment Setting Reason 3-1 Up Main Channel connection to DTE 3-2 Up Subchannel one connection to DTE 3-3 Up Subchannel two connection to DTE 3-4 Down Subchannel three connection to DCE 3-5 XX Subchannel four not used 3-6 XX Subchannel five not used Leased-Line Backup Application Example Another common application example for your 2185 is the Leased-Line Backup application.
Telenetics 2185 Figure 3-10.
Telenetics 2185 In this application the main channel of 2185 A is connected to a host computer through a front-end processor. The data rate is 9. 6 kbps and the format is synchronous. Since the main channel is connected to a DTE type device the main channel on 2185 A is set to DTE. Two subchannels are connected to 2185 B through two networks. One rout is through a digital network and the backup route is through a common telephone network.
Telenetics 2185 Table 3-10. Switch Two Switch Segment Setting Reason 2-1 Down Data Contention 2-2 Up Synchronous operation 2-3 Up Retiming Buffer on 2-4 XX Depends on line conditions 2-5 Down Clock source from 2-6 Up Subchannel One DSU 2-7 Down RTS/DCD on all the time 2-8 XX Doesn't matter (Main Ch DTE) Table 3-11.
Telenetics 2185 Multimaster Multidrop Application Example In this application, 2185s are used to provide a link between remote users and two mainframes, with the second mainframe serving as the backup for the first. Figure 3-11 shows this application. SCH. 4 Figure 3-11.
Telenetics 2185 In this application, the main channel of both 2185 A and 2185 B are connected via a straight-through cable with the 2185 A main channel set to DTE and the 2185 B main channel set to DCE. The data rate is 1.2 kpbs asynchronous so clocking is not an issue. Subchannel one of 2185 A is connected directly to the local host computer and is set to DTE. Subchannel two is connected via a modem link to the backup computer installation and is set to DCE.
Telenetics 2185 Table 3-13. Switch Two Settings – 2185 A Switch Segment Setting Reason 2-1 Up Control Signal Contention 2-2 Down Asynchronous operation 2-3 XX Does not matter; on for sync only 2-4 XX Depends on line conditions 2-5 XX 2-6 XX Does not matter, since unit is set for async. operation 2-7 Down RTS/DCD on all the time 2-8 XX Does not matter (Main Ch DTE) Table 3-14.
Telenetics 2185 Table 3-16. Switch Two Settings – 2185 B Switch Segment 2-1 Setting Down Reason Data Contention 2-2 Down Asynchronous operation 2-3 XX Does not matter, since the unit is on for sync only 2-4 XX Depends on line conditions 2-5 XX 2-6 XX Doesn't matter, since the unit is set for async. operation 2-7 Down RTS/DCD on all the time 2-8 Up CTS on all the time Table 3-17.
Telenetics 2185 Table 3-18.
Telenetics 2185 Alternative power supplies that were not approved at the time of this publication may be available; consult your local distributor for special requirements. Figure 3-12.
Telenetics 2185 OPERATION Once you successfully power-up your 2185, it is fully operational and does not require any further initialization procedures. Once configured, your 2185 operates unattended without operator intervention. Occasional monitoring of the LED status indicators is recommended. POWER-DOWN PROCEDURE Proceed as follows to power-down your 2185. Remove the ac power cord from the primary ac power source. Your 2185 retains its previous configuration when powered-up again.
Chapter 4 Operation and Configuration MAINTENANCE PHILOSOPHY Preventive Maintenance There is no preventive maintenance necessary on your Telenetics 2185 other than the occasional removal of dust that a have settled on the unit. Use a soft cloth to remove dust that may have built up on the outside of the unit. Corrective Maintenance There are no user-repairable components in the 2185. The 2185 is designed to provide maximum up-time.
Telenetics 2185 If all equipment in the network is functioning properly and anti-streaming alarms are occurring, the probable cause is that the subchannel devices are sending valid messages longer than 23 seconds. If this is the case, disable anti-streaming. RETURNING DEFECTIVE EQUIPMENT FOR REPAIR General Packing Information When returning defective equipment to Telenetics or an authorized Telenetics representative for repair, pack the equipment using the following guidelines. 1.
Telenetics 2185 When contacting Telenetics, you receive a Telenetics Return Material Authorization (RMA) Control Number. This RMA Control Number should be clearly marked on the return equipment shipping container(s) for easy identification and faster service. The RMA Control Number is a shipment control tool and does not affect the provisions of a Sales or Lease agreement.
Telenetics 2185 4-4
Chapter 5 Ordering Information INTRODUCTION This chapter provides Telenetics product and ordering information for the 2185. Ordering Information Table 5-1 lists Telenetics 2185 products for and accessories. Any of the items listed may be ordered from your authorized Telenetics representative. Table 5-1.
Telenetics 2185 5-2
Glossary This glossary defines terms used in the 2185 Operator's Guide. ACTIVE LED indicator lamp that illuminates when the subchannel indicated gains access to the main channel. ALARM LED indicator lamp that illuminates when the antistreaming timer automatically disables a subchannel. Anti-Streaming Scheme that protects the network from becoming jammed should one of the subchannel devices fail.
Telenetics 2185 Controller Device responsible for polling terminals and routing messages in a multipoint environment. Control Signal Contention Mode Subchannels contend for use of the main channel to send data to the CPU or controller. In the control signal contention mode, subchannel devices contend by raising control signal RTS if the device is a DTE, or control signal DCD if the device is a DCE. The 2185 DSD returns CTS to a selected subchannel device.
Telenetics 2185 RDY Ready. LED indicator lamp that illuminates when the main channel inbound DSR or DTR is ON. Straight-Through Cable Cable terminated with 25-pin EIA connector at each end. Connections are made on a pin-to-pin basis. See Figure 2-2. Subchannel Contention Subchannels contend for use of the main channel to send data to the CPU or controller. If more than one subchannel tries to access the main channel at one time, the 2185 selects one subchannel and blocks data from all the others.
Telenetics 2185 Glossary-4
Index A Anti-streaming 1-3 Anti-streaming alarm, recovery 4-1 Applications 1-3 cascading the 2185 1-6, 1-8 co-located terminals 1-6 modem-sharing mode 1-5 port-sharing mode 1-4 C Cabling 2-3 Cascading the 2185 1-6, 1-8 Co-located terminals 1-6 configuration defined 3-1 Configuration examples 3-14 digital bridging 3-15 leased-line backup 3-18 multimaster multidrop 3-22 Corrective maintenance 4-1 Customer responsibilities 2-1 D Damage 2-2 Data interface 1-1 Digital bridging application 3-15 E Equipment ass
Index (continued) I Indicators 3-1 Inside front panel 3-2 Installation procedure 2-3 cabling 2-3 equipment assembly 2-3 mechanical 2-3 required tools 2-3 Installation tools 2-3 Installations outside USA or Canada 4-3 USA 4-2 L Leased-line backup application 3-18 LED indicators 3-14 M Main channel broadcast 1-2 Main power connection 3-26 Maintenance corrective 4-1 preventive 4-1 Material shortages 2-2 Mechanical installation 2-3 Modem-sharing mode 1-5 Multimaster multidrop application 3-22 O Operating con
Index (continued) Site preparation 2-1 Specifications 1-9 Subchannel contention 1-2 Switches 3-3 switch one 3-3 switch three 3-14 switch two 3-4 Synchronous data retiming buffer 1-2 U Unpacking 2-2 INDEX-3
Index (continued) INDEX-4
