Arabinda

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.

HTH

Rick

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

Receiver has loss of signal.

Check cabling and tell telco circuits are down.

Remember to rate useful posts clicking on the stars below.