E&M is a signaling method on the analog side of the chan bank and is not directly compatible with analog phones. If you wanted to use the chan bank to drive analog phones from *, then you would need a t100p card(or some other T1 card) in * connected to the chan bank and then replace the E&M Cards with FXS chan units. Then the FXS chan unit will generate the signalling conditions needed by an analog phone controled by *.
All channelized T1's(as opposed to ISDN) use signaling bits to send on and off hook signaling conditions across the digital T1. The chan units in a chan bank control what form that signaling will be presented on the analog output(the centronics plugs). ISDN uses the D channel for all signalling and in a ISDN PRI(US standards) the D channels are agravated into channel 24 and you only get 23 voice channels in a ISDN PRI(US standards). Lyle ----- Original Message ----- From: "Chris A. Icide" <[EMAIL PROTECTED]> To: "Asterisk Users Mailing List - Non-Commercial Discussion" <[EMAIL PROTECTED]> Sent: Tuesday, September 07, 2004 1:45 AM Subject: Re: [Asterisk-Users] offtopic - channel banks > On 11:24 PM 9/6/2004, Ilia Mirkin wrote: > >OK, so we're getting close. E&M is something that rides in the T1 > >datastream. Now - I have E&M cards in the channel bank. So I can set up > >* to talk through the T1 to the E&M card. (please correct me if I've > >misunderstood...) > > You are correct > > > > >The next problem is what goes on with the pairs coming out the back. > >Does * provide the dialtone that the channel bank passes on to the pair > >in the back? Is the assumption made that all of those pairs will be > >connected to standard analog phones? > > Yes, Asterisk provides the dialtone (thus you are able to receive stutter > tone as well if the configuration is correctly done when you have voicemail) > > And yes, the assumption is that the lines are connected to regular old buy > 'em at k-mart analog phones. > > > > >Getting really close to understanding this.... > > > > _______________________________________________ > 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
