In an overseas office, on a network that runs normally, a site that carries extension subracks reports the EXT_COMM_FAIL alarm that lasts two or three seconds. Sometimes, the NE reports this alarm once in several days. Sometimes, the NE reports this alarm several times a day. Sometimes, the NE reports this alarm several times an hour.
What are the conditions and mechanism of reporting this alarm?
NE software version: 220.127.116.11K
If an NE reports the preceding EXT_COMM_FAIL alarm, you can ignore the alarm. Screening the ext_comm_fail alarm does not affect other NEs, because this alarm serves only to check the connection status of the EXT interface. If the cable of the EXT interface is disconnected, the NE reports a bd_status alarm on the related slot.
In the R7 version, this fault is rectified.