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MODEL 2720/I
T1/Fractional T1 CSU/DSU
with Ethernet Bridging
Part# 07M2720/I-A SALES OFFICE
Doc#086181UA
(301) 975-1000
Revised 04/11/01
TECHNICAL SUPPORT
CERTIFIED
(301) 975-1007
http://www.patton.com
An ISO-9001
Certified Company
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TABLE OF CONTENTS 1.0 WARRANTY INFORMATION Thank you for your purchase of this Patton Electronics product. This product has been thoroughly inspected and tested and is warranted for One Section Page Year parts and labor. If any questions or problems arise during installation or use of this product, please do not hesitate to contact Patton Electronics 1.0 Warranty Information .............................................................2 Technical Support at (301) 975-1007. 1.1 Warranty Statem
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1.3 INDUSTRY CANADA NOTICE leased line facilities. The Universal Service Order Code (USOC) is RJ48. The Facility Interface Codes (FIC) are 04DU9-BN, 04DU9-DN, 04DU9-1KN, and 04DU9-1SN. The Service Order Code (SOC) is 6.0N. The Canadian Department of Communications label identifies cer- tified equipment. This certification means that the equipment meets certain telecommunications network protective, operational and safety Facility requirements. The Department does not guarantee the equipment wil
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3. If your CSU causes harm to the telephone network, the telephone 2.0 GENERAL INFORMATION company may temporarily discontinue your service. If possible, they will Thank you for your purchase of this Patton Electronics product. notify you in advance, but if advance notice is not practical, you will be noti- This product has been thoroughly inspected and tested and is warrant- fied as soon as possible and will be informed of your right to file a complaint ed for One Year parts and labor. If any
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Patton 2720 Router Bridge
Ethernet LAN PPP is a protocol used for multi-plexed transport over a point- to-point link. PPP operates on all full duplex media, and is a sym- PEC Device w/ Serial I/F metric peer-to-peer protocol, which can be broken into three main Figure 1. Cisco router with serial interface, configured as PPP Half Bridge. components: 1. A standard method to encapsulate datagrams over serial links; 2. A Link Control Protocol (LCP) to establish, con
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3.1.1 Switch S2 Line Framing Options: The table below shows the default configurations for Switch S2. A D4/Superframe: The D4 framing format, as specified in AT&T description of all S2 options follows this table. TR62411 is the standard in which twelve frames make up a S2 SUMMARY TABLE superframe. All signaling and synchronization are done in- band. Position Function Factory Default Selected Option S2-1 Data Rate On Extended Superframe (ESF): Extended Superframe, as speci- 1.536 Mbps fied in
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Switch S2-6 and S2-7: Clock Mode 3.1.2 Switch S1 Set Switch S2-6 and S2-7 to determine the 2720’s transmitter tim- The chart below shows the default configurations for Switch S1. A ing. description of all S1 options follows this table. S1 SUMMARY TABE S2-6 S2-7 Clock Mode Off Off Network Clock. Transmitter timing is Position Function Factory Default Selected Option derived from the received line signal. V.54 RDL S1-1 RDL Type On On Off Internal Clock. Transmitter clock is derived from an i
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3.2 SOFTWARE CONFIGURATION Switch S1-3: Tx Clock Invert The Model 2720 features a menu-driven command system that Switch S1-3 allows the user to invert the transmit clock originating allows you to monitor/configure its operating parameters. Follow the in the 2720. When S1-2 is set for transmit clock, it may be necessary to instructions below to configure the Model 2720 using the software invert the transmit clock to allow for delays due to long cables. selections: S1-3 Tx Clock Invert 1) Plug t
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4) When the unit is first turned on, the terminal screen may 3.2.1 Introduction to Main Menu appear blank. Press the [Enter] key. If your serial connection is good, the unit will immediately display a password prompt. After entering the password, you may access all of the system’s The following message will appear in the middle of the functions and parameters. The Main Menu looks like this: screen: Patton Electronics Menu Management Enter Password: _ 5) Type in the password and press [Enter].
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The Main Menu options are briefly described below. 3.2.2 System Configuration a System Configuration options allow you to change various The default System Configuration menu looks like this: aspects of the Model 2720’s operation, e.g., framing, line cod- ing, and aggregate bandwidth. System Diagnostics/Statistics options allow you to monitor b the network performance, initiate V.54 loops, local loops, and send test patterns. Network performance parameters are updated once a second, giving you
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ESF: This stands for Extended Superframe Format, a line format developed by AT&T. AT&T Technical Reference 54016 (TR B8ZS: Bipolar violations occur when consecutive pulses are of 54016) defines the ESF, a format which is commonly used to the same polarity. In B8ZS, or Bipolar Eight Zero Substitution, allow monitoring of the network interface performance over bipolar violations are introduced deliberately to indicate that the Facility Data Link (FDL). AT&T TR 62411 says, “the eight zeros have bee
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d Clocking: Network (default) f ESF Data Link: ANSI T1.403 (default) Options: Network, Internal, External Options: ANSI T1.403, AT&T TR54016 Network: This is the most commonly used setting when connect ANSI T1.403: This ANSI developed standard (see ANSI T1.403- ing to a carrier’s network. In this mode, the unit recovers the 1995: Network-to-Customer Installation—DS1 Metallic clock from the received signal and uses it to transmit data. In Interface) uses the FDL to send and receive one second th
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h Remote In-band Loops: Enabled (default) unit. This will cause the unit to enter a special mode. Then turn off the unit and change the switch settings to the desired settings. When you Options: Enabled, Disabled turn the unit on again, the unit will be set up with the selected switch settings. In ESF, D4 and Unframed formats, the unit can respond to special repeating codes in the data stream that represent loopback com- mands. The command to loop up (go into loopback) is a repeating pat- n DS0
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3.2.3 System Diagnostics b Remote Loop Idle (default) The System Diagnostics/Statistics screen looks like this: The Remote Digital Loopback (RDL) test checks the performance of both the local and remote Model 2720s, as well as the communica- tion 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. TxP
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RxPr The Model 2720 is receiving a preparatory pattern. NI STATUS Sack The Model 2720, upon receiving a preparatory pattern, The Network interface (NI) status is shown sends an acknowledgement message. in the middle of the Diagnostics/Statistics screen. The brackets are empty when the RL The Model 2720 is in remote loopback mode. link is operating normally. In this example, various two or three-letter messages are RxTr The Model 2720 is receiving a terminate loopback mes- displayed within the
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Receive Alarm Indication [RAI] indicates that the local unit is receiv- Rx PRM ing 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 The NetLink-T1™ transmits ANSI performance report messages transmitted signal is not reaching the remote unit. once a second when the framing mode is ESF. When the ESF Data Link is set to ANSI T1.403, the unit recognizes PRMs with addresses Rx Level The Model 2720 display
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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 = five minutes 00:10 = ten minutes 00:15 = fifteen minutes 00:30 = thirty minutes (default setting) 00:45 = forty-five minutes 01:00 = one hour 01:30 = 90 minutes 02:00 = two hours 03:00 = three hours NEVER = forever—the unit will remain in loopback without user intervention. 2720 Tx Data Clock Header Line 1 & Header Line 2 This option
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4.2 Connecting the 10Base-T Ethernet Port to a Hub The 10Base-T interface is configured as DTE (Data Terminal The Model 2720 is equipped with DTE, network, and power inter- Equipment), just like a 10Base-T network interface card in a PC. faces. This section briefly describes connection to each. Therefore, it “expects” to connect to a 10Base-T Hub using a straight- through RJ-45 cable. Use the diagram below (Figure 9) to construct a 4.1 Connecting the 10
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9 pulses = Detected LAN receive frame(s) too Once the NetLink-T1™ is installed and configured properly it is large ready to place into operation. This section describes the function of 10 pulses = Detected LAN receive frame(s) not the LED indicators, and the use of the loopback and pattern test octet aligned modes. 11 pulses = Detected LAN receive frame(s) with 5.1 LED DESCRIPTIONS bad CRC The NetLink-T1™ is equipped with six LED indicators that monitor the
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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 com- The Remote Digital Loopback (RL) test checks the performance of patible with two Telco loop diagnostics. Use these diagnostics to test both the local and remote NetLink-T1™, as well as the communication the CSU/DSU and any communication links. These tests can be acti- link between them. Any characters sent to the remote NetLink-T1™ in vated via the
