[Asterisk-Users] ISDN30E + T1 crossover cable woes

[Mark Edwards]

I had a similar issue here in Aus where I was chasing crossover cables
around. Eventually the cows actually did come home and I called up the
telco. They 'rebuilt' (or reinitialized) the ISDN service and everything
worked a treat from there on in. Took a couple of days to get to this point.
Suggest you will probably be OK with straight-through Cat5e. 

Phone up BT and give 'em some stick.

Mark.

 

 

-----Original Message-----
From: phil.dawson at marnock.com [mailto:phil.dawson at marnock.com] 
Sent: Tuesday, 28 February 2006 9:34 PM
To: asterisk-users at lists.digium.com
Subject: [Asterisk-Users] ISDN30E + T1 crossover cable woes

 


Hi, 

I'm having problems getting our server to work with our BT ISDN30 box.  We
are using a Digium TE110P card to connect to the ISDN box on the wall.  The
card is configured as an E1 (strap on).  I've made the T1 crossover cable (
well, made two variations ) and neither work.  The light on the Digium card
flashes red and the red LED's on the ISDN box stay lit.  I've tested the
configuration and all modules load ok.  Done a ztcfg -vvvvv and things look
ok.  Done zttest and get around 99.7% - 99.9%.  After loading asterisk I did
a zap show status and alert is red. 

After googling I found this statement: 

RED: Loss of signal (LOS): The equipment shall assume "loss of signal" when
the incoming signal amplitude is, for a time duration of at least 1 ms, more
than 20 dB below the nominal amplitude. The equipment shall react within 12
ms by issuing AIS. 

The question is, is this a configuration issue, cable issue or BT issue. 

Digium's site is down so couldn't look there  :-( 

One of the diagrams I used is here: 

http://www.gcom.com/home/documents/faqs/cables_&_t1.htm 

The other diagram ( can't seem to find that now ) used 1-5, 2-4 etc. 

Has anyone seen this problem? 

Thank you in advance. 

Phil.

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