[Asterisk-Users] T3 Mux and Asterisk Question

[Steve Totaro]

Thanks for some answers, that is what I thought.  

Asterisk is NFAS capable so I am looking at seven D channels on the T3 I
guess.  I don't want to put a D channel on each T1 or I will lose
several channels that could be used for calls.  

I wonder if there is any way that Asterisk can do NFAS across multiple
servers.  I would put two cards in a box but they will be doing g729
transcoding so I don't want to push it, so it is one per server.

Thanks,
Steve

> 
> Your mux will split the DS3 into 28 DS1 (T1) circuits.  They are
> numbered 1 - 28.  You tell your carrier how and where to assign the D
> channels.  The mux does not have anything to do with D channels or
> signaling; the telco's ISDN switch does.
> 
> A simple setup would have a D channel on every DS1 based PRI.  That
> is 23 B channels and 1 D channel.  The B channels carry voice and the
> D handles the call set-up.  When you assign a D channel to handle
> more than one PRI it is called NFAS (Non-Facility Associated
> Signaling) and you are creating an NFAS Group.  It is also common
> practice to create a backup D channel for each group in case there is
> a failure with the primary D channel.
> 
> I am not sure how Digium or Sangoma cards and drivers handle NFAS but
> that is probably what you should be looking at and communicating that
> to your carrier.
> 
> Tom
> 
> At 07:42 AM 1/22/2006, you wrote:
> >I have a T3 coming from my carrier.  From there I want to use an
Adtran
> >mx2800 T1 Mux to break the T3 into 28 T1/PRI which feed into seven
quad
> >T1/PRI equipped servers.
> >
> >Everything seems very straight forward with the exception of the D
> >channels for the T1/PRI.
> >
> >I am not very familiar with large circuits such as T3s.  I know that
I
> >can use one D channel per set of quad port on each server.  So if
each
> >server has a quad port card, I can use one channel as the D channel
for
> >all four spans.
> >
> >That gives me seven D channels in my setup.  Does anyone know how the
> >Mux handles these D channels onto the T3?  My guess is the Mux is
simple
> >going to send all of the channels onto the T3 without modifying
> >anything.
> >
> >What I would really like to do is have one D channel coming in on the
T3
> >and have it split between each of the T1/PRI or even better one D
> >channel per quad (I know Asterisk can do that).
> >
> >Is it possible?  If the Adtran mx2800 cannot do it, is there anther
> >product that can.  I have looked at the RAD Optimux T3 product but
have
> >had great experience with Adtran products.  The price is the same but
> >the Adtran allows for two controller cards so it seems to have more
> >built in redundancy.
> >
> >Any tips would be appreciated.
> >
> >Thanks,
> >Steve
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