[Asterisk-Users] ADIT 600 "Dynamic Impedance matching"

[Andrew Kohlsmith]

On March 28, 2005 08:15 am, Matt Schulte wrote:
> Thanks for the response, it's a rather simple setup. What worries me is
> we're going into an old PBX, the channelbank goes 25pair about 20 feet
> to a punchdown block. Then from the block goes to another block
> (standard telco room layout) then to the phone system. The old phone
> system is a Meridian, about 20 years old. All the phones coming off that
> are analog from what I gather, the building wiring can range from 5 - 50
> years old.

Yeah that's all pretty standard.

> What's unusual is I've never heard this echo personally. I've had the
> customer call from different phones of course and I've dialed out from
> these phones to even my cell phone and haven't had a problem. What's odd
> is this seems to be random, if I could get it to happen everytime on a
> single phone then I could point fingers at the internal wiring. shrug,
> else all I have to blame is the cb or the wiring between it and the pbx.

Until you are able to recreate it it's going to be hard to nail down...  I'd 
start by testing individual lines -- is it always line 3 that echoes?  If the 
Meridian's hunting you may get the same line 5 times in a row or you may get 
it only when the moon is in Saturn's realm...  And is it only specific 
destination numbers or ...?  There are still too many variables.

-A.