Mike's PBX Cookbook

E1 PRI (ISDN) - Reset Procedure


Use the following procedure to disable and re-enable a troublesome ISDN PRI circuit.
Steps in RED (and an asterisk) are for Option 11 systems only, ignore these on large systems.

1 LD 60: STAT

Note the LOOP number, and associated DCH (on channel 31) of your PRI. We must know these before we start!
The following reset procedure is performed on Loop 12 and DCH 5, but you must substitute YOUR values instead!
See below for a LD 60 STAT command output example.

2 Disable:

  1. LD 96: DIS AUTO 5
  2. LD 96: DIS DCH 5
  3. LD 96: STAT DCH 5 (check that d-channel 5 is disabled)
  4. LD 60: DISL 12
  5. LD 60: STAT 12 (check that loop-12 is disabled)
  6. * LD 60: DIS CC 0

Remove / replace card.

Note: Set the front panel switch to Dis before removing or inserting. After inserting, wait 10 seconds, and set to Enb.
Be sure to compare card dip switch settings so both cards are optioned the same. Switch S12 sets card to either DTI2 or PRI2. S12-4 On = PRI2 Mode.

3 Enable:

  1. LD 96: ENL DCH 5
  2. LD 96: STAT DCH 5 (ensure d-channel 5 is enabled)
  3. LD 60: ENLL 12
  4. * LD 60: ENL CC 0
  5. * LD 60: TRCK PCK
  6. LD 60: STAT 12 (ensure loop 12 is enabled)
  7. LD 96: ENL AUTO 5
  8. LD 60: STAT 12

There should now be 3 green lights on the card, and 30 IDLE channels!

If this procedure doesn't work, try the following:

If the loop is 'stuck', and you are unable to disable/enable it, try to reset the DCH. In LD 96, enter RST MSDL X.

Example printouts:

Use STAT in LD 60 to indentify your PRI Loop(s), DCH number(s), and check the circuit status.
The CH31 position shows the associated D-channel number for that loop, in this case DCH 5.

A healthy 'In Service' E1 may look like this:

STAT

PRI2 LOOP 12 - ENBL
REF CLK: ENBL
TRACKING
SERVICE RESTORE: YES
ALARM STATUS: ACCEPTABLE
CH 01 - IDLE DID   VOD  *           CH 02 - IDLE DID   VOD  *
CH 03 - IDLE DID   VOD  *           CH 04 - IDLE DID   VOD  *
CH 05 - IDLE DID   VOD  *           CH 06 - IDLE DID   VOD  *
CH 07 - IDLE DID   VOD  *           CH 08 - IDLE DID   VOD  *
CH 09 - IDLE DID   VOD  *           CH 10 - IDLE DID   VOD  *
CH 11 - IDLE DID   VOD  *           CH 12 - IDLE DID   VOD  *
CH 13 - IDLE DID   VOD  *           CH 14 - IDLE DID   VOD  *
CH 15 - IDLE DID   VOD  *           CH 16 - IDLE DID   VOD  *
CH 17 - IDLE DID   VOD  *           CH 18 - IDLE DID   VOD  *
CH 19 - IDLE DID   VOD  *           CH 20 - IDLE DID   VOD  *
CH 21 - IDLE DID   VOD  *           CH 22 - IDLE DID   VOD  *
CH 23 - IDLE DID   VOD  *           CH 24 - IDLE DID   VOD  *
CH 25 - IDLE DID   VOD  *           CH 26 - IDLE DID   VOD  *
CH 27 - IDLE DID   VOD  *           CH 28 - IDLE DID   VOD  *
CH 29 - IDLE DID   VOD  *           CH 30 - IDLE DID   VOD  *
CH 31 - DCH 5
.

An 'Out Of Service' E1 may look like this:

STAT

PRI2 LOOP 12 - ENBL
REF CLK: DSBL
SERVICE RESTORE: NO
ALARM STATUS: OOS NO AUTO STRT  LOCAL ALARM : LOS
CH 01 - MBSY DID   VOD  *           CH 02 - MBSY DID   VOD  *
CH 03 - MBSY DID   VOD  *           CH 04 - MBSY DID   VOD  *
CH 05 - MBSY DID   VOD  *           CH 06 - MBSY DID   VOD  *
CH 07 - MBSY DID   VOD  *           CH 08 - MBSY DID   VOD  *
CH 09 - MBSY DID   VOD  *           CH 10 - MBSY DID   VOD  *
CH 11 - MBSY DID   VOD  *           CH 12 - MBSY DID   VOD  *
CH 13 - MBSY DID   VOD  *           CH 14 - MBSY DID   VOD  *
CH 15 - MBSY DID   VOD  *           CH 16 - MBSY DID   VOD  *
CH 17 - MBSY DID   VOD  *           CH 18 - MBSY DID   VOD  *
CH 19 - MBSY DID   VOD  *           CH 20 - MBSY DID   VOD  *
CH 21 - MBSY DID   VOD  *           CH 22 - MBSY DID   VOD  *
CH 23 - MBSY DID   VOD  *           CH 24 - MBSY DID   VOD  *
CH 25 - MBSY DID   VOD  *           CH 26 - MBSY DID   VOD  *
CH 27 - MBSY DID   VOD  *           CH 28 - MBSY DID   VOD  *
CH 29 - MBSY DID   VOD  *           CH 30 - MBSY DID   VOD  *
CH 31 - DCH 5
.

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