[Asterisk-Users] ISDN30E + T1 crossover cable woes

[Tim Robinson]

Phil
To connect a BT ISDN30e to the TE110P card you do NOT require a T1 
crossover.  You need a straight through cable, and any cat5 cable will 
be just fine.

Rgds
Tim

phil.dawson at marnock.com wrote:

>
> 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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