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Patton electronics 2720 User Manual

T1/fractional t1 csu/dsu with ethernet bridging
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MODEL 2720/I
T1/Fractional T1 CSU/DSU
with Ethernet Bridging
Part# 07M2720/I-A
Doc#086181UA
Revised 04/11/01
C E R T I F I E D
An ISO-9001
Certified Company
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
http://www.patton.com

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  Summary of Contents for Patton electronics 2720

  • Page 1 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 C E R T I F I E D (301) 975-1007 http://www.patton.com An ISO-9001 Certified Company...
  • Page 2: Table Of Contents

    However, there is no guarantee that interference will not occur in a particular installation. If the Model 2720 Series causes interference to radio or television reception, which can be determined by...
  • Page 3 The tele- phone company may decide to temporarily discontinue your service if they believe your Model 2720 Series may cause harm to the telephone network. Whenever possible, they will contact you in advance. If you elect to do so, you have the right to file a complaint with the FCC.
  • Page 4: Service Information

    NOTE: Packages received without an RMA number will not be accepted. Patton Electronics' technical staff is also available to answer any questions that might arise concerning the installation or use of your Patton Model 2720. Technical Support hours: 8AM to 5PM EST, Monday through Friday. 1.7 CE NOTICE...
  • Page 5 PPP bridging to function as a node on the remote Ethernet network. The serial interface on the Cisco will have an IP address on the same Ethernet subnet as the bridge. Patton 2720 Router Bridge Ethernet LAN PEC Device w/ Serial I/F Figure 1.
  • Page 6 The framing bits are now used for framing, CRC and the Facility Data Link (FDL). The FDL allows maintenance messages and information to be passed between the 2720 and the Central Office. Alternate Mark Inversion (AMI): This mode does not inherently account for ones density.
  • Page 7 Switch S1-1: RDL Type Switch S1-1 selects the type of Remote Digital Loopback that the 2720 will initiate when the RDL is initiated from this unit. The 2720 will respond to both the V54 and the CSU loopback regardless of the...
  • Page 8: Software Configuration

    Switch S1-3: Tx Clock Invert 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.
  • Page 9 The maximum length of the password, which can include any character the terminal can generate, is 16 characters. The Model 2720 will then display the Main Menu screen. 3.2.1 Introduction to Main Menu After entering the password, you may access all of the system’s functions and parameters.
  • Page 10 Unit Options allow you to customize the Model 2720 for your location. You can change the default header names to give each unit a unique name and password. Also, you can reset the unit to its default settings without the manual.
  • Page 11 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”...
  • Page 12 Options: Enabled, Disabled The ESF format provides the CO the ability to put the customer installation’s Model 2720 into loopback mode. The Model 2720 recog- nizes these special messages that are sent over the FDL. When enabled, the unit will respond to these loopback commands and go into or out of loopback mode.
  • Page 13 Default Config Source: Switch (default) Option: EEPROM, Switch The Model 2720 can be initialized via the configuration in the on- board permanent memory (EEPROM) or via the internal DIP switches (Switch). Once the unit is powered up, you may change the settings through the control port or the DIP switches.
  • Page 14 The Model 2720 is sending a test pattern while in Test Mode IdlP The Model 2720 is sending a test pattern in place of data. The Model 2720 is not in test mode. The Model 2720 receiving a RL can be in one of the following states:...
  • Page 15 The Model 2720 is receiving a terminate loopback mes- sage. Wt1s The Model 2720 is waiting for a sequence of all ones and will time out if it does not receive it. IdleP The Model 2720 is sending a QRSS, 511 or 2047 pattern.
  • Page 16 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...
  • Page 17 Tx Clock Invert This option allows the user to invert the transmit clock originating in the 2720. When Tx Data Clock is set for transmit clock, it may be necessary to invert the transmit clock to allow for cable delays.
  • Page 18 Figure 3: Connecting the 10Base-T Ethernet Port to a PC The 10Base-T Interface is configured as DTE (Data Terminal Equipment). If the Model 2720/I is to to connect to another DTE device such as a 10Base-T network interface card, construct a 10Base-T crossover cable and connect the wires as shown in the dia- gram below (Figure 4).
  • Page 19: Led Descriptions

    Figure 12 (below) shows the location of the LEDs on the NetLink-T1™ Series front panel. 10BaseT T1/FT1 CSU/DSU Figure 7: 2720/I Front Panel T1 Link Solid green indicates that the end to end TI link is up. Signifying that the link is active.
  • Page 20: Loop (V.54 & Telco) Diagnostics

    NetLink-T1™ in this test mode will be echoed (returned) back to the user device (i.e., characters typed on the key- board of a terminal will appear on the terminal screen). T1/FT1 CSU/DSU T1/FT1 CSU/DSU Model 2720/I Model 2720/I Receive Internal Ethernet...
  • Page 21: Bit Error Rate (V.52) Diagnostics

    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.
  • Page 22: Appendix A - Specifications

    PATTON NETLINK-T1 MODEL 2720 SPECIFICATIONS WAN Speed: 1.544 Mbps WAN Connection: RJ-48C Nominal Impedance: 100 Ohms DTE Interface: 10Base-T Ethernet (802.3) Line Coding: AMI/B8ZS Line Framing D4/ESF/Unframed Receive LBO: Automatic Transmit LBO: Selectable - 0, 7.5, 15, or 22.5 dB, plus DSX-1...
  • Page 23: Appendix C - Factory Replacement Parts And Accessories

    Patton Model # Description 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...T1 N x 64 CSU/DSU(DB25 female,UI) 2720/I/UI...T1 N x 64CSU/DSU(10BaseTEthernet,UI) PATTON NETLINK-T1™ MODEL 2720 INTERFACE PIN ASSIGNMENT...

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2720/i