[asterisk-users] Dahdi, b410p and looping from 1 port to another

[Olivier]

2008/11/26 Kevin P. Fleming <kpfleming at digium.com>

> Olivier wrote:
>
> >     (As for the question of wiring: I have no idea. Refer to the
> >     documentation or to the answers of others in this thread)
> >
> >
> > b410 manual says pins are affected this way :
> >
> > 3   Tx+ (TE)   Rx+ (NT)
> > 4   Rx+(TE)    Tx+ (NT)
> > 5   Rx-(TE)    Tx- (NT)
> > 6   Tx- (TE)   Rx- (NT)
> >
> > I don't know if this means a straight cable is ok or not.
> > If someone could shed some light ...
>
> It should be fairly obvious from that documentation. The entire purpose
> of the jumpers is to switch between NT wiring and TE wiring, and on page
> 18 of the manual (currently on www.digium.com) it specifically says
> "This eliminates the need to use a crossover cable." Consider the light
> to be shed :-)


Yes but both jumpers were set according this doc.

But as we're talking about jumpers, after reading this same doc (page 19) I
then had a doubt about whether or not I should turn on100ohm termination to
NT port.

Doc says it should be turned on "in those instances where a BRI is
daisy-chained and terminated on the B410P in NT mode".
So after reading this again, I would I should have turned it on.

Do you agree ?

B410P card1 - port1 - TE mode  <------> B410P card2 - port1 - NT mode
<------> B410P card2 - port2 - NT mode


>
> --
> Kevin P. Fleming
> Director of Software Technologies
> Digium, Inc. - "The Genuine Asterisk Experience" (TM)
>
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