VGW - TSHOOT (T1 or E1)

For a T1 or E1 PRI troubleshooting, follow the following steps.

1. show controllers [t1 | e1] 
1. Check most of the PRI fields by this show controllers command.
2. Ensure that line coding, framing, and clock source are configured and match the settings set by your Service Provider
1. Line Coding
1. T1 - Bipolar-8 Zero Substitution (B8ZS) and Alternate Mark Inversion (AMI) 
1. B8ZS - (also called Clear Channel and Binary 8 Zero Substitution) replaces each string of 8 consecutive zeros with the special pattern "000VB0VB" 
2. AMI -  Each successive mark is inverted and the average or DC level of the line is therefor zero
2. E1 - High Density Bipolar of Order 3 (HDB3)
2. Framing
1. T1 - Super Frame (sf) and Extended Super Frame (esf) - not compatible with each other
1. Super Frame - consists of 12 consecutive 193-bit frames
2. Extended Super Frame - consists of 24 consecutive 193-bit frames
1. E1 - framing crc4 (cyclic redundancy check) and no-crc4
3. Check if the line is down
1. Make sure the controller is NOT administratively down. Perform a "no shut" command on the Controller interface.
4. Check for reported alarms
1.  Use the show controllers command to see if there are any alarms on the controller.
2. Receive Alarm Indication Signal (BLUE)
1. 
   
5. Check for error events
6. Check if the interface is T1 or E1 CAS, E1 R2, or PRI

show controllers t1

T1 0/3/0 is up.

  Applique type is Channelized T1

  Cablelength is long 0db

  Description: Qwest LongDist #4 CID DS1-1234567

  No alarms detected.

  alarm-trigger is not set

  Soaking time: 3, Clearance time: 10

  AIS State:Clear  LOS State:Clear  LOF State:Clear

  Version info Firmware: 20100222, 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 (155 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, 0 Unavail Secs

  Total Data (last 24 hours)

     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, 0 Unavail Secs