Alcatel Unleashed

Hi guys

First of all, I should know better, Ive been programming OXE's for over 10 years.. but I spent about 3 hours last night bashing my head against a wall trying to do a simple T0 loopback on a common hardware system with a Mix 4/8/4 board.

Ports 0 and 1 are the 2 Ive elected to use, configured Port 0 as the "network" end (trunk group 10) and also set TIE to Yes (I think thats the setting).. B channel choice on TG 10 set to yes, and then Port 1 as the "user" end, used Trunk Group 20. Both are set with ISDN All countries and T0 access. Just using a professional trunk seize with overlapping and sending 4 digits.. (I also have tried this with the ports the other way around (as in network and user) and its the same story)

I honestly think my Layer 1 is the issue as the when I run a t3 I get absolutely nothing in the trace. Trkstat says both channels are free on both accesses. According to doco the pin outs on the RJ45 ports for a T0 are pin 3 TX+, pin 4 RX+, pin 5, RX- and pin 6 TX-, so in theory I thought the cross over cable I made with 3 RX+, pin 4 TX+, pin 5, TX- and pin 6 RX- should do the trick.. Unless it should be, TX+ to RX-, TX- to Rx+..

Ive done T2 loopbacks more times than I can remember and never had these issues.. of course Im pretty sure Ive never really tried a BRA loopback before except maybe once on a BPRA2 board.. and couldnt get it going then either.. but I also thought that was a layer 1 issue.. When I have tested and reset the coupler the first call "rings out" and then each subsequent call gives me the voice guide "to request a call back"..

I read something earlier when searching the forum about power on a common hardware BRA only working on certain ports, not sure if thats part of my issue.. Im just using an MG1 chassis with the MIX board in slot 2, GD in slot 3 and.. the CPU running in VMware Everything else about the system works (analog ports, voice guides, SIP trunks, NOE sets etc) so unless Ive done a booboo with some kind of hardware incompatibility Im sort of stuck..

Help?!?!?

Thanks

Was TC 495 about T0 accesses, not sure with MIX boards the same rules or not (I think the same).

The T0 accesses of BRA2, BRA4, BRA8 boards operate per pairs.
The line interface is common to 2 accesses: 0/1, 2/3, 4/5, 6/7.
So the configuration of the Network/User mode of the access of a same pair must be strictly identical.
In the opposite case, some troubles of level 1 activation and desynchronization occur on the T0
accesses.

So - I think you cannot use ports 0/1 for loopback - use 0/2

Thanks vad, had a quick look at that TC.. its a bit vague, but Ill give it a go

I don't think network mode is supported on Common Hardware. It wasn't a while ago and doubt it beeing changed. I had the exact same problem but with an external system connected over a T0 where the OXE was set up in network mode.
We had to change this and set the other system in network mode when connected to Common Hardware and, voila, problem solved.
T3 only gives you layer 3 ( hence the name), and as the problem is at layer 1 or 2, it cannot be traced with this (crappy) tool.
Setup the tuner filters manually and run mtracer -b instead which gives you layer 2. You'll probably see that it fails to bring this layer up.

on T0 on common hw when you use MIX, there is a one limit cannot give a sync / master from T0 on MIX, easy to remember for me, was some ears ago, as i've got 'a learing gear' small case with MIX244, CPU and GD/MADA1 + ipphone, and in order to do a ABC-F on T0, i've must use another 'learning set' but with a BRA2 for common hw as separate card (or... ;-D use plugware ) , not on a MIX.
The limit is still in place, simply T0 on MIX will do no master / will not provide any sync to other devices, hardware limit i'm afraid...
But to do simple voice loop, there is always a 4094 plugware with S0 powered, you make user on S0 bus, still limited only to a 'MSN' mode (not DDI) for me was enough to test some voice recorder when i had no access to real ISDN NT-1 / any crystal BRA/BPRA card.