Well, you might be better off at that scale to use a cisco as5850 or equiv with SER and Asterisk. I might not work so well with 672 calls going thru 1 asterisk box.
ds3 <-> Cisco as5850 <-> Asterisk (Possible multiple depending on actual config and use) ----- Original Message ----- From: "Marcelo Pacheco" <[EMAIL PROTECTED]> To: "Asterisk Users Mailing List - Non-Commercial Discussion" <[EMAIL PROTECTED]> Sent: Thursday, September 16, 2004 12:52 PM Subject: Re: [Asterisk-Users] Beyond T1 > I'm no E1 expert, but as I understand one channel is wasted with framing, so > it is as 2048000 bps link, where one 64000 bps channel is wasted with > signalling. So there's 31 channels left. If you use E&M, FXS or FXO, you > could get 31 voice channels, with PRI or MFC/R2D you get 30 voice channels. > > I now that from the fact that a full E1 with EuroISDN gives you 30 voice > channels. > > An a full E1 with Brazilian R2D also gives you 30 voice channels, as one > channel is used for signalling as CAS (Channel Associated Channeling), where > each 4 bits is used for each channel. > > The only situation where you get closer to actual 2mbps out of an E1 channel > is when you run SyncPPP, Frame Relay or another bit synchronous protocol on > the full trunk/link, where you throw away the channelling and use the whole > link as one big synchronous bit pipe. > > Marcelo Pacheco > > Em Qui 16 Set 2004 13:26, Andrew Kohlsmith escreveu: > > On Thursday 16 September 2004 12:17, Andrew Thompson wrote: > > > Depending on where you using the circuits, you might try an E1. It uses > > > the same total bandwidth as a T1(I think), but splits the channels at > > > 56K instead of 64K, yielding more channels. (And now I can't remember > > > the number.) > > > > uh, no. This is definitely NOT correct. > > > > T1 is 24 8-bit channels + 1 framing bit sent 8000 times a second. 24*8+1 = > > 193 bits per frame * 8000 = 1554000bps. > > > > E1 is 32 8-bit channels + 1 framing bit sent 8000 times a second. 32*8+1 = > > 2056000bps. > > > > (my E1 knowlege is poor, I hope I am not furthering the misinformation > > here) > > > > In both cases you get 64kbit clean channels unless you're doing robbed-bit > > (inband) signalling. > > > > -A. > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
