AR路由器与友商设备E1对接问题定位一例

发布时间:  2014-09-11 浏览次数:  465 下载次数:  0
问题描述
AR2200与友商设备通过E1 120欧姆中继线缆连接,但两端设备端口都不能up
告警信息
None
处理过程
1.检查中继线缆针脚对应关系,收发对应正确

友商 E1(RJ45)     AR E1(RJ45)

4 (TX+)                     1(RX+)
5 (TX-)                      2(RX-)
1 (RX+)                    4(TX+)
2 (RX-)                     5(TX-)

2.两端设备分别做自环测试,端口都能正常up

<Huawei> display fe1 serial 1/0/0
Serial1/0/0 is UP
Basic Configuration:
Work Mode is E1 Fractional Framed, Cable type is 120 Ohm balanced.
Frame-format is NO-CRC4, Line Code is Hdb3.
Source Clock is Slave, Data-coding is Normal.
Idle code is 7E, Itf type is 7E, Itf number is 4.

3.检查两端设备端口配置,发现友商设置帧格式为CRC4,但AR2200默认帧格式为非CRC4。

友商配置

AHQ#sh controller E1 0/0/0
E1 0/0/0 is down.
Applique type is Channelized E1 - balanced
Transmitter is sending remote alarm.
Receiver has loss of frame.
alarm-trigger is not set
Version info Firmware: 20060711, FPGA: 13, spm_count = 0
Framing is CRC4, Line Code is HDB3, Clock Source is Line.
CRC Threshold is 320. Reported from firmware is 320.

AR 2200配置:

<Huawei> display fe1 serial 1/0/0
Serial1/0/0 is down
Basic Configuration:
Work Mode is E1 Fractional Framed, Cable type is 120 Ohm balanced.
Frame-format is NO-CRC4, Line Code is Hdb3.
Source Clock is Slave, Data-coding is Normal.
Idle code is 7E, Itf type is 7E, Itf number is 4.

4.修改AR2200 E1端口帧格式为CRC4后,链路up
[Huawei] interface serial 1/0/0
[Huawei-Serial1/0/0] fe1 frame-format crc4
[Huawei] display fe1 serial 1/0/0
Serial1/0/0 is UP
Basic Configuration:
Work Mode is E1 Fractional Framed, Cable type is 120 Ohm balanced.
Frame-format is CRC4, Line Code is Hdb3.
Source Clock is Slave, Data-coding is Normal.
Idle code is 7E, Itf type is 7E, Itf number is 4.
根因
1. 线缆针脚顺序错误
2. 设备端口硬件问题
3. 两端设备配置不一致
建议与总结
E1端口互联异常时,请确认端口/线缆类型、时钟模式、帧格式等参数的配置正确性

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