[Asterisk-Users] Re: Connection TDM400P to UK PSTN

[Chris Earle (CBL)]

Okay, sorry to hash out this discussion again, but it's starting to drive me
crazy

Successfully got the adapters to allow the BT phones to ring on lines coming
out of a TDM.......... but now my latest problem is echo.

I have done tweaking of the gains in North and South America, and after a
bit of work have gotten echo to go away, but this seems to just not want to
go away.

On an incoming call from the POTS, everything on my end sounds perfect,
but on the internal extension phone, there is an echo when you speak.  An
almost perfect copy of what you say.  If I turn down the gains on that
channel, it doesn't seem to do much, or causes other volume issues.

Help!

In my research and hunting, I am starting to worry that the US-bought digium
cards have IMPEDENCE issues in the UK with the BT Lines etc?  That would
seem to explain why the echo is so incessant.  I have even tried changing
Echo Cancellers to MARK3.

Right, this is Asterisk 1.0.9, Zaptel 1.0.9.2 on Debian

Suggestions / Experiences in UK appreciated


--
Chris Earle
System Solutions Specialist,

----- Original Message ----- 
From: "John Novack" <jnovack at stromberg-carlson.org>
Newsgroups: gmane.comp.telephony.pbx.asterisk.user
Sent: Wednesday, August 24, 2005 10:03 AM
Subject: Re: Connection TDM400P to UK PSTN


> The jacks on the TDM are ( incorrectly ) referred to as RJ45, correctly
> they are 8 position modular.
> The line, either in or out is on the two CENTER pins. NONE of the other
> 6 pins are used.
> Though I am not in the UK, from what I know you don't use the two center
> pins for a single line connection, so you will need to fashion some sort
> of adapter to connect. Frankly, using the two center pins ( A Bell
> System brain blizzard) wasn't the smartest idea. It makes the modular
> plug into, with the addition of just a little moisture, a really good
> spark gap when a ring signal or small induction of lightning is applied.
> I have seen many a modular plug turned black and useless  since the
> introduction of modular in the US in the early 70's
>
> Good luck
>
> John Novack
>
>
> Graham Kiff wrote:
>
> > I'm a complete Asterisk novice and have an installation based on the
> > Asterisk at Home <mailto:Asterisk at Home>CD.
> >
> > I've installed my TDM400P with 2 x FXO & 2 x FXS, but every time I try
> > to dial out, I get a message "No circuits available".
> >
> > Can someone confirm the pinouts for connecting the FXO's to a UK BT
> > Line - I have RJ11 connectors on the back of my TDM400P card, so
> > ideally I'd like to know the pin mappings from a standard BT plug to
RJ11.
> >
> > Cheers
> > Graham
> >
> >------------------------------------------------------------------------
> >
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