------ Original Message ------
From: "Tony Kasule" <[email protected]>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<[email protected]>
Sent: 30/06/2015 8:34:47 p.m.
Subject: Re: [asterisk-users] Help With Physical Layer
Hello,
Anyone to help me with this issue? It has never worked :(
Hi Tony
I'm not familiar with the card you but 120 ohm is usually twisted pair,
and 75 ohm is coax (usually). If it is changeable its usually done with
jumpers on the card. I have used RAD modems before and their cable will
have a specific pinout that you need to match. I doubt your digium card
by default matches the pins, but maybe, and perhaps maybe your alcatel
did. There will be a tx pair and an rx pair and you need to make sure
they connect to the rx and tx pairs on the digium preferably with the
same polarity. If you are getting no signal I would think its that. You
can use a multimeter to check for voltage on the pins.
Once you get that sorted another catch maybe timing. You will need to
take E1 timing from one or other of the Telco's, with one as the primary
source. If they for some reason aren't synced you will get errors every
so often
Good luck
Cheers Duncan
On Wed, May 20, 2015 at 11:34 AM, Tony Kasule <[email protected]>
wrote:
Hello users,
I have a Digium Te235 and asterisk 13 which have worked well with 1
carrier but we have failed to add a 2nd carrier. The second telco
brings their E1 line over finer, terminated in a RAD modem and they
give me ethernet to the E1 card. It's the first time i am having
install such a solution, which ideally would be not a big problem.
However, The physical layer has failed to come up! I have tried the
same setup in an Alcatel OmniOCX and it works well. I can confirm that
the port is also well configured because when I interchange the cables
(with the exiting cable from the other telco), the alarm clears
emmediately for the 1st telco and becomes RED for the 2nd telco. A
loop also clears the alarm on both ports.
The telco has told me to make sure that Line Impedance is 120 ohms but
There's no where to set that and when I was reading, I was told that
E1 is already 120 ohms so no need to change anything.
Has anyone here experienced this? What other things can I try?
Thank you!
Regards,
Tim
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