[Asterisk-Users] Echo Canceller Wiring (Tellabs.. HOWTO..?)

[Brent Franks]

> Hello,
> 
> I have been researching Echo Can's for a while now, and wanted to post
> this out to the list to solicit feedback (and if my assumptions are
> correct, hopefully help others out)...
> 
> If anyone out there knows anything about wiring up an Echo Can, and my
> outline below is incorrect, please let the me/list know..
> 
> I have posted the Documents I received from Tellabs at:
> http://regent.mindworks.net/echo/
> 
> If you look at Page 6 of the Shelf PDF, you can see there are four 50 pin
> connectors.
> 
> These connectors are as follows:
> 
> Receive In      (RX-in?)
> Send Out        (TX-out?)
> 
> Send In         (TX-in?)
> Receive Out     (RX-out?)
> 
> Am I off base yet?
> 
> Now, in order to hook this up between a Channel Bank and a T100P, I want
> to post my thoughts and see if they check out...
> 
> A crossover cable goes like this:
> (Btw, Most of this info I got from:
> http://www.juniper.net/techpubs/hardware/m40/m40-hwguide/html/pinout4.html)
> 
> RJ-451          RJ452
> 1       -->     5
> 2       -->     4
> 4       -->     2
> 5       -->     1
> Pin 1, is RX/Ring
> Pin 2, is RX/Tip
> Pin 3, NOT USED
> Pin 4, TX/Ring
> Pin 5, TX/TIP
> 
> Here is where it gets tricky (or confusing at least to me), trying to hook
> the echo can up.
> 
> I envision this
> 
> T100P --> Tellabs Echo Can --> Adtran TA750 (Channel Bank)
> 
> Should a Crossover be performed at each location? E.g. Crossover from
> T100P to Tellabs Echo, and another Crossover From Echo to Adtran?
> 
> Here goes.  This portion is from Asterisk to the Echo Canceller:
> 
> Asterisk                Echo Can
> Pin 1                   Send In, Pin 26
> Pin 2                   Send In, Pin 1
> Pin 3 -------------------------------
> Pin 4                   Receive In, Pin 26
> Pin 5                   Receive In, Pin 1
> 
> Before I throw what I think is correct for Channel Bank to Echo Can, I
> want to solicit feedback regarding * to Echo Can.
> 
> I think i Might be way off.
> 
> My confusion stems from the Line Side and Drop Side.
> 

To clear things up, I think I might have a better understanding now.  Line
Side is where the Channel Bank will be, Drop Side is *.

- Brent