Troubleshooting Legend/Magix T1 issues
PRI TROUBLESHOOTING- D Channel Inoperative
1) Check Permanent alarm table for any other T carrier related alarms (i.e., DS1 loss of Signal). If present trouble shoot those alarms. (See Errors below)
2) Verify the status of the network and the DTE on the CSUs LEDs. Troubleshoot
accordingly if either side shows a problem . (On 3160/3164 CSU, verify that the LEDs are assigned to DTE.
3) Verify that the CSU channels are mapped and Programmed for DATA
4) Verify that the CO (Central Office) switch selection in the PRI programming is correct i.e., B8ZS/ESF
5) Verify that the Magix TEI is set for 0 ( Lines/Trunks>PRI>Protocol>TEI.)
6) Demand Test the 100d module
7) If the T carrier is set to AMI, verify that the CO (Central Office) has inverted the D-channel
8) Attempt to reset the PRI by disconnecting the cable at the 100D, wait 1 minute and then reconnect the cable
9) Run the CSU Loop back test to a 103 loop back or loop back plug towards the Magix at the Smart jack
10) Verify that the Technician , while programming, did not program the PRI, then reprogram the T1 and then reprogram back to PRI. If so, system erase the Magix and re program the PRI and retest.
11) Cycle Power on the Magix
12) Verify the configuration of the CO (Central Office ) switch with the CO Technician
A) If the CO is a 5ESS make sure they are running ATT Custom
B) If the CO is a DMS 100 and/or DMS 250 make sure they have Variant= NTNAPRI, (L1 flags in Trunk Sub Group = Yes) If set to ‘NO’ the D channel will act problematic.
C) If DSX600E make sure Profile =p250.
13) Have the CO restart the PRI and determine why the D channel didn’t come up.
14) Verify the continuity for the T by having the CO run a stress test to a loop back at the CSU
15) Replace the 100d
16) Replace the Processor
17) At this point the problem has to be a Network issue.