[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.

Anybody with experience, your expertise would be greatly appreciated by
me, and I am sure many others.

Thanks!

- Brent