[asterisk-users] About Asterisk with Digium TE405P PRI ISDN cad

[A J Stiles]

On Monday 11 February 2013, Shitian Long wrote:
> Hello,
> 
> I am trying to connect two asterisks with PRI connection. One asterisk has
> TE405P Quad PRI ports card, anther asterisk has TE110P 1 PRI port card.
> 
> I am wondering if there would be some step by step guide that I could
> follow to to this kind of connection?
> 
> Thanks

If you want to connect the two boxes together via the telephone network, then 
you will need appropriate NTEs  (Network termination Equipment -- the boundary 
between where the telco's responsibility ends and yours begins)  installed, 
and the telco should give you cables -- or at least advise on wiring.  
Connecting an Asterisk card to an NTE requires a straight-through cable.

If you just want to connect the boxes directly  (aot via the telephone 
network)  then you will need to make up a special cable.  Get CAT5 cable, 
plugs and crimping tool.  (If you are especially lazy, you can even just cut 
the plug off one end of a pre-wired CAT5 cable, and crimp your own in place of 
where it used to be.)  Now you need to swap over pin 1 (WHITE/orange) with pin 
5 (WHITE/blue) and pin 2 (ORANGE/white) with pin 4 (BLUE/white).  It won't do 
any harm leaving pins 3, 6, 7 and 8 connected, and it will make crimping up 
the plugs easier.


One end:  Standard wiring.
1: WHITE/orange 2: ORANGE/white 3: WHITE/green 4: BLUE/white 5: WHITE/blue 6: 
GREEN/white 7: WHITE/brown 8: BROWN/white

Other end:  Special wiring for ISDN crossover.
1: WHITE/blue 2: BLUE/white 3: WHITE/green 4: ORANGE/white 5: WHITE/orange 6: 
GREEN/white 7: WHITE/brown 8: BROWN/white


Don't forget, one of the machines has to be told  (in chan-dahdi.conf)  to 
pretend it is an NTE rather than subscriber's equipment!

-- 
AJS

Answers come *after* questions.