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Interoperation Configuration Guide

AR Router

This document provides cases for connecting AR enterprise routers to devices of other vendors.
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Exception Handling

Exception Handling

After cables are connected between the AR and optical transceiver, run the display controller e1 command. The command output shows that the E1 interface is Down, and the IP address of the optical transceiver cannot be pinged on the AR.

[RouterA] display controller e1 4/0/0                            
E1 4/0/0 current state : DOWN                                                     
Description : HUAWEI, AR Series, E1 4/0/0 Interface                             
Basic Configuration:                                                            
  Work Mode is E1 Unframed, Cable type is 120 Ohm balanced.                     
  Frame-format is None, Line Code is Hdb3.                                      
  Source Clock is Slave, Data-coding is Normal.                                 
  Idle code is 7E, Itf type is 7E, Itf number is 4.                             
  Loopback is Not Set. 
Alarm State:
  Receiver alarm state is Loss-of-Signal. 
  Transmitter is sending remote alarm. 
  Pulse density violation detected.  

To rectify the fault, perform the following steps:

  1. Run the display controller e1 command. If the message "Receiver alarm state is Loss-of-Signal." is displayed under Alarm State, the cables may be disconnected, improperly connected, or in poor contact with the interface. Check the cables and wire sequence.
  2. Check whether cables are properly connected. Cables are properly connected between the AR and optical transceiver.
  3. Check the wire sequence of the cables connected to the AR and optical transceiver.

    Table 15-7 lists the wire sequence of the 120-ohm DB9-to-RJ45 cable and optical transceiver interface.

    Table 15-7  Wire sequence of the 120-ohm DB9-to-RJ45 cable and optical transceiver interface

    Wire Sequence of the 120-ohm DB9-to-RJ45 Cable

    Wire Sequence of the Optical Transceiver Interface

    4 (Rx +)

    1 (Tx +)

    5 (Rx -)

    2 (Tx -)

    1 (Tx +)

    4 (Rx +)

    2 (Tx -)

    5 (Rx -)

  4. On the optical transceiver interface connected to the AR, send packets to the AR to conduct a loopback test. The test result shows that the AR interface is Up and the number of packets specified by Input is the same as the number of packets specified by Output on the serial interface. Therefore, the 2E1-M interface card and cables are working properly, and the fault occurs on the optical transceiver.
  5. Conduct a local loopback test on the optical transceiver interface. The test result shows that the optical transceiver interface is Down, indicating that the AR is connected to an incorrect optical transceiver interface. Connect the AR to the correct optical transceiver interface.
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Updated: 2019-05-17

Document ID: EDOC1100034005

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