[Asterisk-Users] two isdn cards

[Stankiewicz Michael]

thanks to all for your help
i've keeped busy myself reading tons of documentation at 
http://www.voip-info.org/
and
http://idsn.jolly.de
and between pratical hw/sw experiences and theory ... i'm stuck.
my configuration should be the following:
hardware idsn nt1 ----> input isdn card on asterisk ----> output isdn
card on asterisk ----> outer isdn line
i'm quite sure that sw side is correct and, again, i've got doubts on
the cables, since your two responses (thanks a lot to Alex and Emanuele
{ciao}) are opposite.
i've made 2 cables, following the schemes one here:
http://www.cisco.com/en/US/tech/tk652/tk653/technologies_configuration_example09186a008010ef6c.shtml
and the second here:
http://www.gcom.com/home/support/t1crossover.html
and both don't work.
so my questions are:
is my configuration possible ?
again, which cable should i use ? it's correct to mod an ethernet cable
?
should i put the 100 ohm resistors somewhere ? (Emanuele: you wrote that
the bus should be terminated, but the resistors should not be on the
cable itself; where should they go ?)

before that configuration i've tryied the basic one:
asterisk with one isdn card ---> pstn
and all worked like a charm

sorry for that boreness, i'm a newbye smashing his brain on telephony
technology jargon from only one week, 
for sure i'll publish a detailed how-to on that project as soon as all
that stuff starts to work
thanks to everyone
mike

On Mon, 2005-05-23 at 18:08, Emanuele Pucciarelli wrote:
> Stankiewicz Michael wrote:
> > thanks a lot,
> > i've googled around hunting for an answer to my biggest doubt: the
> > cross-cable.
> > i understand that it looks like an cat-5 cross-cable and how it has to
> > be done, but ... why 8 wires ? 
> 
> The plug is a standard RJ45 one, but only the 4 inner wires are used.
> Sometimes you need the outer wires to carry power, but I believe you
> shouldn't cross them.
> 
> I strongly suggest that you do NOT use the T1 cable schemes, since they
> do not have much to do with the S0 BRI bus.  The link I mentioned in the
> last message (isdn.jolly.de) carries the information you need, and I can
> assure you it works (without even the NT).
> 
> If you connect a "live" NT (hooked to the central office) to Asterisk to
> access your ISDN line, then you are going to use a card in TE mode,
> without any special configuration, and a normal, off-the-shelf ISDN cable.
> 
> Regards,