Inter-Node Links & NPRAE board frequently fails

[kisanbhai]

Dear Members,

I have four of my OXE ( crystal Hardware- Rel F5.401) interconnected on ABC-F through NPRAE Boards. It has been observed that these links goes up & down very frequently and the NPRAE board also keeps on rebooting. I have replaced the NPRAE board and also changed the slots. Has anyone faced the same problem.
Rgds

[kisanbhai]

Has Anybody in the forum any clue about the solution.

[vad]

If you want to have some answer - describe you configuration.
- exist or not digital connection with PSTN;
- explain synchronization priority managment on your network (show "infocs" output, check - not only in PBX managed synchro priority but in modem/MUX/SDH equipment too);
- exist or not some incidents - problem with layer 1, bad frame, syncronization in PBX.

[kisanbhai]

Dear Vad,
Thanks for your reply.
FYI, This network is not connected to any Public Analog / Digital Lines.
@ Except at ICC node, I have only 1 NPRAE board whose 1 circuit is connected on electrical media and second circuit is on Fibre through TLNO board.
Attached are some of the pics & incident & PABX syn plan. For SDH / PDH, I am trying to get more info and would update you ASAP.

Regards

[vad]

Looks like - you have problem between node 4 (ICC) and node 2 (Pole-2). After link 2-4 problem - you have problem with link 2-3.
Compare synchro priority management (for SDH or such type of equipment) - node 1-4 and 2-4.
For node 3 - try to manage highest priority from node 1 (f.e. 10 from node 1 and 20 from node 2) - check - during problem with link 2-4, 2-3 - problem with link 1-3 must be absent.

[kisanbhai]

Dear Vad,

Thans for such a keen observation. But do you think that due to Sync priority, the NPRAE board can be rebooted automatically very frequently. I have too much driver errors from these NPRAE. Any suggession ?
Rgds

[kisanbhai]

Dear Vad,

Attached herewith is the stripped network diagram of SDH, PABX and GPS clock. What do you suggest. Is this PABX synchronization correct. All the SDH in the network are locked to GPS clock and so is my wish to have my PABX running on the same rthym.

PABX Synchronization Scheme.JPG