Let's try some ascii art :-
you |---------|local telco equip|-------|remote telco equip|------far end|
If you are seeing AIS, it is the local telco kit telling you that somewhere
down the line their is a fault
It often means the far end is unplugged
what can you see from the far end ?
At 15:56 10/08/2001, Erik Drost wrote:
>Hi,
>
>I have a problem with a VWIC using G.703 in an NM-2FE2W on a Cisco 3620
>(IOS 12.2.1 IP featureset). The E1 serial line is down and a "show
>controller E1" shows a "Receiver is getting AIS" error message (framing,
>impedance and linecode are configured correctly):
>
>Router#sh controllers e1
>E1 1/0 is down.
> Applique type is Channelized E1 - unbalanced
> Receiver is getting AIS.
> alarm-trigger is not set
> Version info Firmware: 20010315, FPGA: 15
> Framing is NO-CRC4, Line Code is HDB3, Clock Source is Line.
> Current port master clock: local osc on this network module
> Data in current interval (171 seconds elapsed):
> 0 Line Code Violations, 0 Path Code Violations
> 0 Slip Secs, 171 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
> 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 171 Unavail
>Secs
> Total Data (last 24 hours)
> 1 Line Code Violations, 0 Path Code Violations,
> 0 Slip Secs, 86400 Fr Loss Secs, 1 Line Err Secs, 0 Degraded Mins,
> 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 86400
>Unavail Secs
>
>Documentation on CCO (http://www.cisco.com/warp/public/74/107.html)
>tells me:
> The Alarm Indication Signal (AIS) alarm is set when the last FAS
>and NFAS frames have included less than 3 0's in timeslot 0 (the AIS is
>an all 1's signal). The AIS is normally set by transmission equipment
>detecting a fault.
>
>But I still don't know what I have to do to troubleshoot the line. Can
>anybody help me with this one?
>
>Thanks in advance,
>
>Erik Drost
-- Ian
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