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 > >_______________________________________________ > >--Bandwidth and Colocation provided by Easynews.com -- > > > >Asterisk-Users mailing list > >To UNSUBSCRIBE or update options visit: > > http://lists.digium.com/mailman/listinfo/asterisk-users > > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > Asterisk-Users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- Asterisk-Users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users