Cisco Cisco 4-Port OC-3c STM-1c ATM Shared Port Adapter Technisches Handbuch

Assume interface Serial3/0/0.1/1/1/1:1 is down/ down. This notation can be explained as
"interface serial [slot/subslot/port].[au-4/tug-3/tug-2/e1]:[channel-group]". So for
interface Serial3/0/0.1/1/1/1:1 the parameters become:

Slot = 3
Subslot = 0
Port = 0
Au-4 =1
Tug-3 = 1
Tug-2 =1
E1= 1
Channel-group = 1

Note: This example would be used as a reference for rest of the document.
Check status of SONET [slot/subslot/port] controller using following command: 

Router#

controller SONET 3/0/0

 framing sdh

 clock source line

 aug mapping au-4

 !

  mode c-12

  tug-2 1 e1 1 channel-group 0 timeslots 1-8

  

 timeslots 13-14

  tug-2 1 e1 1 channel-group 2 timeslots 9-12

<Output suppressed>

Router#

 (C-12 1/1/1/1) is down

 VT Receiver has LP-T_MIS.

  timeslots: 1-30

  Transmitter is sending LOF Indication.

  Receiver is getting AIS.

  Framing is crc4, Clock Source is Internal, National bits are 0x1F.

  Data in current interval (693 seconds elapsed):

     0 Line Code Violations, 0 Path Code Violations

     0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

     0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs

     262 Unavail Secs, 0 Stuffed Secs

3.

Next step is to find if issue is local to the router or on the remote side. Enable a soft loop on
AU-4 1, TUG-3 1, TUG-2 1, E1 1 using following commands:

Router#configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)#controller SONET 3/0/0

Router(config-controller)# au-4 1 tug-3 1

Router(config-ctrlr-tug3)#  

Note: You can enable loopback on

complete E1 and not just on specific channels. If loopback is applied on complete E1, all
corresponding channels-groups of that E1 will go down.If interface comes up at both layer 1
and 2 then issue is not local to the router. At this moment troubleshooting needs to be done
on the remote side. If however, interface does not come up then proceed to step 5.

Remember to remove the loopback in both cases using the following commands:

Router#configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)#controller SONET 3/0/0

4.