[Asterisk-Users] offtopic - channel banks

[Lyle Giese]

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" <chris at netgeeks.net>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<asterisk-users at lists.digium.com>
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
> Asterisk-Users at lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users
>