USER MANUAL MODEL 2720/I T1/Fractional T1 CSU/DSU with Ethernet Bridging Part# 07M2720/I-A Doc#086181UA Revised 04/11/01 CERTIFIED An ISO-9001 Certified Company SALES OFFICE (301) 975-1000 TECHNICAL SUPPORT (301) 975-1007 http://www.patton.
TABLE OF CONTENTS Section Page 1.0 Warranty Information .............................................................2 1.1 Warranty Statement 1.2 Radio and TV Interference 1.3 Equipment Attachment Limitations 1.4 FCC Compliance 1.5 Service Information 2.0 General Information...............................................................4 2.1 Features 2.2 General Product Description 3.0 Configuration .........................................................................5 3.1 DIP Switch Configuration 3.
1.3 INDUSTRY CANADA NOTICE The Canadian Department of Communications label identifies certified equipment. This certification means that the equipment meets certain telecommunications network protective, operational and safety requirements. The Department does not guarantee the equipment will operate to the user's satisfaction. Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of the local telecommunications company.
3. If your CSU causes harm to the telephone network, the telephone company may temporarily discontinue your service. If possible, they will notify you in advance, but if advance notice is not practical, you will be notified as soon as possible and will be informed of your right to file a complaint with the FCC. 4. If you experience trouble with the CSU, please contact Patton Electronics, Co. for service or repairs. Repairs should be performed only by Patton Electronics Co. 5.
3.0 PPP Operational Background PPP is a protocol used for multi-plexed transport over a pointto-point link. PPP operates on all full duplex media, and is a symmetric peer-to-peer protocol, which can be broken into three main components: 1. A standard method to encapsulate datagrams over serial links; 2. A Link Control Protocol (LCP) to establish, configure, and test the data-link connection; 3. A family of Network Control Protocols (NCPs) to establish and configure different network layer protocols.
3.1.1 Switch S2 Line Framing Options: The table below shows the default configurations for Switch S2. A description of all S2 options follows this table. S2 SUMMARY TABLE Position Function Factory Default Selected Option S2-1 Data Rate On S2-2 Data Rate On S2-3 Data Rate On S2-4 Framing & Coding Off ESF/B8ZS S2-5 DS0 Rate On 64 kbps S2-6 Clock Mode Off Network S2-7 Clock Mode Off Network S2-8 Reserved Off Reserved 1.
Switch S2-6 and S2-7: Clock Mode Set Switch S2-6 and S2-7 to determine the 2720’s transmitter timing. S2-6 Off On S2-7 Off Off Clock Mode Network Clock. Transmitter timing is derived from the received line signal. Internal Clock. Transmitter clock is derived from an internal oscillator. NOTE 1: When using the Model 2720 as a high-speed short range modem, one unit of the link must be configured in Internal Clock mode, and the opposite end unit must be configured for Network Clock mode.
Switch S1-3: Tx Clock Invert 3.2 SOFTWARE CONFIGURATION Switch S1-3 allows the user to invert the transmit clock originating in the 2720. When S1-2 is set for transmit clock, it may be necessary to invert the transmit clock to allow for delays due to long cables. The Model 2720 features a menu-driven command system that allows you to monitor/configure its operating parameters.
4) When the unit is first turned on, the terminal screen may appear blank. Press the [Enter] key. If your serial connection is good, the unit will immediately display a password prompt. The following message will appear in the middle of the screen: 3.2.1 Introduction to Main Menu After entering the password, you may access all of the system’s functions and parameters. The Main Menu looks like this: Patton Electronics Menu Management Enter Password: _ 5) Type in the password and press [Enter].
The Main Menu options are briefly described below. a System Configuration options allow you to change various aspects of the Model 2720’s operation, e.g., framing, line coding, and aggregate bandwidth. b System Diagnostics/Statistics options allow you to monitor the network performance, initiate V.54 loops, local loops, and send test patterns. Network performance parameters are updated once a second, giving you the ability to quickly determine if there is a problem.
ESF: This stands for Extended Superframe Format, a line format developed by AT&T. AT&T Technical Reference 54016 (TR 54016) defines the ESF, a format which is commonly used to allow monitoring of the network interface performance over the Facility Data Link (FDL). AT&T TR 62411 says, “the Extended Superframe Format “extends” the DS1 superframe structure from 12 to 24 frames…for a total of 4632 bits.
d Clocking: Network (default) Options: Network, Internal, External Network: This is the most commonly used setting when connect ing to a carrier’s network. In this mode, the unit recovers the clock from the received signal and uses it to transmit data. In this way the unit remains synchronized to a master clock. Incampus applications, one of the units must be set to Internal clock, and the other end is set to Network clock. At all times, there must be only one clock source.
h Remote In-band Loops: Enabled (default) Options: Enabled, Disabled In ESF, D4 and Unframed formats, the unit can respond to special repeating codes in the data stream that represent loopback commands. The command to loop up (go into loopback) is a repeating pattern of 00001s. This pattern overwrites the normal data. When this code is detected for 5 seconds, the unit will go into loopback if the Remote In-band Loopback is Enabled.
3.2.3 System Diagnostics b The System Diagnostics/Statistics screen looks like this: Remote Loop Idle (default) The Remote Digital Loopback (RDL) test checks the performance of both the local and remote Model 2720s, as well as the communication link between them. Data from the local DTE is sent across the entire communication circuit and looped back to the local DTE. The Model 2720 Initiating a RL can be in one of the following states: Idle No user-controlled loopbacks are active.
c RxPr The Model 2720 is receiving a preparatory pattern. NI STATUS Sack The Model 2720, upon receiving a preparatory pattern, sends an acknowledgement message. RL The Model 2720 is in remote loopback mode. RxTr The Model 2720 is receiving a terminate loopback message. Wt1s The Model 2720 is waiting for a sequence of all ones and will time out if it does not receive it. The Network interface (NI) status is shown in the middle of the Diagnostics/Statistics screen.
Receive Alarm Indication [RAI] indicates that the local unit is receiving a Yellow Alarm. This alarm is sent by the remote unit or the central office when it loses the received signal. This indicates the local unit’s transmitted signal is not reaching the remote unit. Rx Level The Model 2720 displays the current received signal strength in dB. There are four level ranges detected: +2 to –7.5 -7.5 to –15 -15 to –22.5 < -22.
3.3.6 Unit Information Loop Timeout The Unit Options screen looks like this (factory default): The Loop Timeout setting can be set to one of the following: 00:05 = 00:10 = 00:15 = 00:30 = 00:45 = 01:00 = 01:30 = 02:00 = 03:00 = NEVER = five minutes ten minutes fifteen minutes thirty minutes (default setting) forty-five minutes one hour 90 minutes two hours three hours forever—the unit will remain in loopback without user intervention.
4.0 INSTALLATION 4.2 Connecting the 10Base-T Ethernet Port to a Hub The 10Base-T interface is configured as DTE (Data Terminal Equipment), just like a 10Base-T network interface card in a PC. Therefore, it “expects” to connect to a 10Base-T Hub using a straightthrough RJ-45 cable. Use the diagram below (Figure 9) to construct a cable to connect the 10 BaseT interface to a 10Base-T Hub. The Model 2720 is equipped with DTE, network, and power interfaces. This section briefly describes connection to each. 4.
5.0 OPERATION Once the NetLink-T1™ is installed and configured properly it is ready to place into operation. This section describes the function of the LED indicators, and the use of the loopback and pattern test modes. 5.1 LED DESCRIPTIONS The NetLink-T1™ is equipped with six LED indicators that monitor the status of communication. Figure 12 (below) shows the location of the LEDs on the NetLink-T1™ Series front panel.
5.2 LOOP (V.54 & TELCO) DIAGNOSTICS 5.2.2 Operating Remote Digital Loopback (RL) The NetLink-T1™ offers three V.54 loop diagnostics and is compatible with two Telco loop diagnostics. Use these diagnostics to test the CSU/DSU and any communication links. These tests can be activated via the software control port (See Section 3.2.3 System Diagnostics), via signals on the serial port interface or the front panel switch. 5.2.
2. Perform a bit error rate test (BERT) using the internal V.52 generator (as described in Section 5.3), or using a separate BER Tester. If the BER test indicates a fault, and the Local Line Loopback test was successful for both NetLink™s, you may have a problem with the twisted pair line connection. To perform a V.52 test, follow these steps: 1. Activate the local loopback or remote loopback diagnostic. 2. Activate the test pattern. This may be done in one of two ways: 5.2.
APPENDIX B ETHERNET 10BASE-T SPECIFICATIONS APPENDIX A PATTON NETLINK-T1 MODEL 2720 SPECIFICATIONS DTE Interface: 10Base-T on RJ-45F DTE Data Rates: 10Mbps LAN Connection: RJ-45, 10Base-T, 802.3 Ethernet Protocol: PPP (RFC 1661) with Bridging Control (RFC 1638) WAN Speed: 1.544 Mbps WAN Connection: RJ-48C Nominal Impedance: 100 Ohms MAC Address Table Size: 4096 entries DTE Interface: 10Base-T Ethernet (802.
APPENDIX D APPENDIX C PATTON NETLINK-T1™ MODEL 2720 FACTORY REPLACEMENT PARTS AND ACCESSORIES Description Patton Model # 10 - 09F............................6 Foot Control Port Cable, 2.5mm to DB9F 07M2720/I........................User Manual 2720/C/UI.........................T1 N x 64 CSU/DSU(M/34 female, UI) 2720/B/UI.........................