The state of an interconnected SA interface cannot be Up

Problem description: The state of the physical interface and protocol of the SA card cannot be Up.
Serial1/0/0 current state: DOWN
Line protocol current state: DOWN
Description: HUAWEI, AR Series, Serial1/0/0 Interface
Route Port,The Maximum Transmit Unit is 1500, Hold timer is 10(sec)
Internet Address is 172.20.18.22/30
Link layer protocol is nonstandard HDLC
Last physical up time : 2012-08-09 16:04:29
Last physical down time : 2012-08-09 16:04:29
Current system time: 2012-08-09 16:32:47
Physical layer is synchronous, Virtualbaudrate is 64000 bps
Interface is DTE, Cable type is V24, Clock mode is TC
Last 300 seconds input rate 0 bytes/sec 0 bits/sec 0 packets/sec
Last 300 seconds output rate 0 bytes/sec 0 bits/sec 0 packets/sec
Handling process:
1. If the peer end does not receive the signal, run the following command to set the transmit clock signal of the serial interface in inversion synchronization mode:
[Huawei-Serial1/0/0]invert transmit-clock
2. If the local end does not receive the signal, run the following command to set the receive clock signal of the serial interface in inversion synchronization mode.
[Huawei-Serial1/0/0]invert receive-clock
Note: Clock signals of the serial interface in inversion synchronization mode can be configured only when AR3200 is used as a DTE device.
After the preceding steps, most of the problems that the state of the SA interface is not Up can be resolved or filtered out.
Root cause:
The clock phases of the peer devices connected through the SA interface are not consistent.

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