Our company router connects with transmission device of company F via interface E1，the service is normal,but the transmission device of company F prompts that the device interface of our device is error, while the side of Vendor C is normal.
Networking:2600--transmission----Company C router
1.The service is normal, so exclude the problems of our device.
2.Consult the vendor and know the alarm may derive from the inconsistent spare codes, and the default spare codes of the transmission device is EF.
3.The spare code of the interface E1 of our device is:7E or FF，which is not consistent with that of the transmission device of company F,and we can ensure the alarm is from the inconsistent spare codes.
4.Amend the spare codes and the problem is solved.
The spare codes of interface E1 of our device are not consistent with those of the transmission device of company F,so the transmission device prompts the interface is error.