[Asterisk-Users] T3 Mux and Asterisk Question

[Tom]

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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