[Asterisk-Users] Channel Bank configuration

[Steven Critchfield]

On Thu, 2003-07-10 at 18:33, Marty Mastera wrote:
> Hello,
> 
> I don't have any experience with channel banks and would appreciate any
> feedback on my theory outlined below:
> 
> We have a single T1 entering the building with channels 1-12 being voice
> lines and 13-24 being a 768k internet connection.  This T1 terminates to
> an Adit 600 (T1-1). 
> 
> Here's what I know.  Channels 11-12 go out the Adit 600's 25-pair
> connector to a wiring block (and eventually to 2 fax machines - I assume
> this is to have the fax machines bypass the currently installed phone
> switch).  The data comes out the Router card on the Adit and into our network.
> 
> The currently installed phone system is an NEC NEAX2000 IVS box which is
> connected by CAT5 to the Adit 600's T1-2 port.  (I am assuming that voice 
> channels 1-10 are mapped to the Adit T1-2 and getting to the NEC this
> way....There is also a 25 pair cable leaving the NEC and terminating on a 
> wiring block for the desk phones.
> 
> So my assumption is that channels 1-10 are mapped as FXO onto the Adit's
> 2nd T1 port, channels 11-12 to the Adit's 25-pair connector and 13-24 to
> the router card for data.
> 
> This leaves the NEC box to handle the FXS (and hence why it is directly
> connected to the phones).
> 
> When I replace the NEC box with an * box/T100P, I'm thinking that I will
> have to map Channels 1-12 to the T1-2 port and map the 8 Adit FXS
> channels on the T1-2 port to the Adit's 25-pair for the Adit's FXS
> capability....then run that T1 into the T100P and configure * to route
> between the FXO and FXS channels appropriately.
> 
> Does this sound right?  I'm trying to understand if the channel bank uses 
> the T1 from the Adit for both FXO and FXS channels!


This depends on what you are allowed to do and what you wish to
accomplish. 
First: Who owns the ADIT? 
a. If it is your telco, then you need to find out where they think the
dmark is. Basically you need to know if you can configure the ADIT.

b. If you own the ADIT, then you can proceed.

Second: You need to think about what you want do with it. Linux with a
T100P can be your router, and therefore you can take the T1 from the
wall and plug it straight into the T100P and configure linux to be your
router. Then you need to bring your lines back out to go to phones. How
many extension phones do you need to use, and how many FXS ports do you
have on the ADIT? You mentioned only dropping 2 lines out of the ADIT
currently, and you mentioned 8 FXS channels. Sounds like you will
probably need more FXS cards.

The downside of using linux to be your router is that you will need a
second T100P or a T400P card to have enough channels to get stuff done.
If you want to continue using the ADIT router, then you can route the 10
channels off the ADIT to asterisk, and then you can route up to 14
channels back to the ADIT to be combined with the 2 you already have
being dropped off to the FAX machine. This means you will need to make
sure you have at least 2 FXS cards.
-- 
Steven Critchfield <critch at basesys.com>