Comments on: Help needed in configuring T1 lines

By: Kumar

Kumar — Wed, 10 Mar 2010 07:05:49 +0000

show controller, show the below output. Please suggest.

T1 0/0/0 is down.
Applique type is Channelized T1
Cablelength is long 0db
Transmitter is sending remote alarm.
Receiver has loss of signal.
alarm-trigger is not set
Soaking time: 3, Clearance time: 10
AIS State:Clear LOS State:Clear LOF State:Clear
Version info Firmware: 20090408, FPGA: 13, spm_count = 0
Framing is ESF, Line Code is B8ZS, Clock Source is Line.
CRC Threshold is 320. Reported from firmware is 320.
Data in current interval (316 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, 316 Unavail Secs
Total Data (last 24 hours)
691 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, 86400 Unavail Secs

By: Kumar

Kumar — Wed, 10 Mar 2010 07:05:17 +0000

If these T1s are to produce a 6 Mbps link they obviously are to be configured as multilink. To support multilink the serial interfaces need to be configured with encapsulation ppp and configured in a multilink group, and the multilink interface needs to be configured.
The lack of encapsulation ppp would prevent the line protocol from coming up. But the lack of encapsulation would not explain the line state as being down. I would agree that show controller T1 is a good place to start troubleshooting.

By: Kumar

Kumar — Wed, 10 Mar 2010 07:04:29 +0000

Start checking “show controller T1″, if down, complain to telco.
Also, ISP must provide you with configuration for the serial interface, if it is MLPPP or not, etc.