TELECOM Digest OnLine - Sorted: Help Needed : SS7 Continuity Check With NMS TX Boards

Help Needed : SS7 Continuity Check With NMS TX Boards

raistlin.buces@gmail.com
8 Mar 2006 17:04:15 -0800

Hello,

For an application that uses NMS TX 3220 boards to handle the SS7
signalling and NMS AG 4000 boards to handle the voice channels, I need
to implement the continuity check.

But i can't put a circuit into a loopback mode, can anyone please help/
give any clues?

NMS just said that "loopback should be done with TX board", not any
more clues. and i did not find any other info from documentation.

Here is some detail about the scenario

The far end sends IAM packet and then sends COT right after it. And
after some seconds REL comes and conversation drops.

-----------------------------------------

IAM
17:58:32.0 MTP3.1 <-- : Link # 0
xx xx xx xx 8B 08 00 01 08 20 01 0A 00 02 0A 08
02 xx xx xx xx xx xx xx 0A 09 04 13 xx xx xx xx
xx xx 12 31 02 00 00 39 02 31 C0 00

COT
17:58:32.0 MTP3.1 <-- : Link # 0
xx xx xx xx 8B 08 00 05 01

------------------------------------------
from Q764
* IAM packet, "Nature Of Connection Indicators" field,
* HGFEDCBA :
* bits DC: Continuity check indicator
* 0 0 continuity check not required
* 0 1 continuity check required on this circuit
* 1 0 continuity check performed on a previous circuit
* 1 1 spare
So, I may be wrong but it DC bits seem to be "10" on this packet (08)
------------------------------------------

Best Regards.

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