[Asterisk-Users] some EICON Diva 4BRI questions

[Armin Schindler]

On Sat, 22 Apr 2006, Klaus Darilion wrote:
> On Fri, April 21, 2006 15:19, Armin Schindler said:
> > Hi Klaus,
> >
> >> Thanks for the detailed answers and isdn for Linux basics.  I will take
> >> the opportunity to ask some more questions :-)
> >>
> >> On Fri, April 21, 2006 12:24, Armin Schindler said:
> >> > On Fri, 21 Apr 2006, Klaus Darilion wrote:
> >> >> 3. Is the PIN layout for TE or NT mode?
> >> >
> >> > It is TE PIN layout, you need a crossed cable with 100Ohm termination
> >> for
> >> > NT-mode.
> >>
> >> Why do I need a cable with 100Ohm termination? Shouldn't be the
> >> termination inside the DIVA Server? Until now (with quadbri and other
> >> isdn
> >> card) I only used CAT5 cables with BRI-crossover PIN layout. No
> >> resistors.
> >> Can you please explain this a little bit more or give me links to the
> >> wiring basics?
> >
> > I must admit that I don't really know that. Maybe the quadbri has this
> > termination automatically on board. Since the Eicon DIVA Server card has
> > basically a TE port, the termination is necessary.
> > I always use the 100Ohm termination in my NT-cross-cables.
> >
> > Here is a short description on Melware Wiki:
> >   http://www.melware.org/BriCrossCable
> 
> Hi Armin!
> 
> I guess the RJ-45 jack with the resistor must be connected to the DIVA
> card, right?

As far as I know that doesn't matter. I have my resistors just in the middle 
of the cross-wired cable.
 
> But I'm still confused. Usually, if a line needs termination, the
> termination is needed on both ends. Thus, if there is no line termination
> inside the DIVA card, we would termination in TE mode too.

Sorry, I don't know why this is different to 'normal' ISDN line. Maybe 
the difference is about the distance. A normal ISDN line may be more than a 
few meters, but in NT-mode I have my PBX/Equipment connected to the card 
with a one meter cross-cable.

I will try to find out more about this.

Armin