VoIP Mailing List Archives
Mailing list archives for the VoIP community |
|
| View previous topic :: View next topic |
| Author |
Message |
Alex.Lopez at OpSys.com
Guest
|
 Posted: Sat May 17, 2008 5:30 pm Post subject: [asterisk-users] Using a Loopback Plug for an RJ-45 Ethernet |
 |
|
It will go Green if a PROPER loopback plug is inserted.
Pins 1 and 2 shorted to 4 ad 5
Pin 1 to 4
Pin 2 to 5
Leave the others open...
| Quote: | -----Original Message-----
From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
bounces at lists.digium.com] On Behalf Of Jay R. Ashworth
Sent: Saturday, May 17, 2008 6:02 PM
To: asterisk-users at lists.digium.com
Subject: Re: [asterisk-users] Using a Loopback Plug for an RJ-45
EthernetInterface for testing a Digium Card
On Sat, May 17, 2008 at 05:50:46PM -0400, Jose P. Espinal wrote:
| Quote: | Someone told me about using a Loopback plug for RJ-45 for testing if
|
|
a
| Quote: | | Quote: | Digium Card gave him 'green' Alarm (for testing if the card had been
damaged by a strange voltage surge); would this have some bad side
|
effect?
Well, it's actually probably an RJ-48X interface, but who's counting.
If your question, though, is "would plugging a loopback-wired 8p8c
|
modular
| Quote: | plug into the jack on the back of a T-1 card cause it any damage in
itself?", I can't imagine the answer would be "yes", no.
If you loop it and it stays in Red alarm, it's probably broken.
I can't speak to exactly what the alarm status stuff does if the port
you're looping expects to have a PRI plugged into it: I would expect
"Green, but no actual traffic", but I could be wrong, I'm a bit new on
that front.
Cheers,
-- jra
--
Jay R. Ashworth Baylink
jra at baylink.com
Designer The Things I Think
|
RFC
'87
647
|
|
| Back to top |
|
 |
mcollins at fcnetwork.com
Guest
|
| Posted: Mon May 19, 2008 12:36 pm Post subject: [asterisk-users] Using a Loopback Plug for an RJ-45 Ethernet |
|
|
| Quote: | I can't speak to exactly what the alarm status stuff does if the port
you're looping expects to have a PRI plugged into it: I would expect
"Green, but no actual traffic", but I could be wrong, I'm a bit new on
that front.
|
Just for the record, this is generally a correct statement. I can't
speak for every T1 interface out there, but every T1 interface I've
personally used does respond to the so-called "hard loopback" that is
described elsewhere in this thread. The hard loopback really is just a
layer one test. On Zaptel you should definitely see a green light when
you plug in a loopback test plug. This is kind of a sanity test - not
necessarily for the equipment but rather for the guy trying to make it
run!  It is a very basic test, and it fits in with "is the computer
plugged in and turned" and "did the zaptel driver(s) get loaded" and
such. A green light simply means that the layer one connection is
working - the physical connection, the framing and coding, timing, etc.
Obviously this needs to be working before you can get meaningful traffic
moving over the interface...
Happy T1/E1-ing.
-MC |
|
| Back to top |
|
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Search
