asterisk users - Apr 2006 - Pinouts for T1/E1 crossover cable WAS "RE: what cable to connect a legacy PBX to a TE410P ?"

Can't anyone stop self-promotion and tell the poor guy what he needs.

A T1/E1 X-over cable using an RJ-45 (8-cond.) is pinned out as follows:

1 - 4
2 - 5
3 - NU
4 - 1
5 - 2
6 - NU
7 - NU
8 - NU

NU = Not Used

I have not in my experience seen any problems with using a Good Quality
Cat5 vs. Cat 3 (telco standard) cable for X-connects.  YMMV, but you
should be fine. As far as the shielding goes, I use UTP cables and
Connectors all the time and some of my X-connects run over 100 feet.



-----Original Message-----
From: asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Steve
Totaro
Sent: Saturday, April 22, 2006 11:49 AM
To: Paul Mahler; Asterisk Users Mailing List - Non-Commercial Discussion
Subject: RE: [Asterisk-Users] what cable to connect a legacy PBX to a
TE410P ?

LOL


-----Original Message-----
From:	Paul Mahler [mailto:psvwm@yahoo.com]
Sent:	Sat 4/22/2006 11:09 AM
To:	asterisk-users@lists.digium.com
Cc:	
Subject:	Re: [Asterisk-Users] what cable to connect a legacy PBX
to a TE410P ?

A T carrier cable is not the same as an ethernet cable. A T carrier
cable uses a real metal shielded RJ-45 and loosely twisted pair wire.
With most modern T carrier equipment, you can use a CAT-5 ethernet cable
instead of a real T carrier cable. A T-carrier crossover cable does not
have the same wiring pattern as a crossover ethernet cable. With an
older piece of equipment like the Matra, I would be tempted to purchase
a real T carrier crossover cable. This is covered in my book, by the
way. 
 
>Louis-David Mitterrand wrote: 
>Hello, 
 >
>I am about to put an asterisk server between the telco E1 and our old
Matra PBX.   
>Should I use an ethernet cross cable? Something else?
  
Paul Mahlerpmahler@signate.com
www.signate.com



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Alexander Lopez wrote:
>Can't anyone stop self-promotion and tell the poor guy what he needs.
>
Seems to me that SOME self promotion belongs on the biz list, and for 
those considered in the "inner circle" it is OK here!

Everyone is equal. Some are more equal than others

JMO

John Novack

Alexander Lopez wrote:
>I have not in my experience seen any problems with using a Good Quality
>Cat5 vs. Cat 3 (telco standard) cable for X-connects.  YMMV, but you
>should be fine. As far as the shielding goes, I use UTP cables and
>Connectors all the time and some of my X-connects run over 100 feet
>  
>
I have used cat-5 for everything communications. serial printers, dumb 
terminals, DS1  and even 10/100 ethernet. :-) It's easier to have it 
installed as a network jack and then use for whatever you need.

...

Andrew McRory
LinuxSystems
Tallahasse, FL

On Sat, Apr 22, 2006 at 11:59:21AM -0400, Alexander Lopez
wrote:
> Can't anyone stop self-promotion and tell the poor guy what he needs.
> 
> A T1/E1 X-over cable using an RJ-45 (8-cond.) is pinned out as follows:
> 
> 1 - 4
> 2 - 5
> 3 - NU
> 4 - 1
> 5 - 2
> 6 - NU
> 7 - NU
> 8 - NU
> 
> NU = Not Used
> 
> I have not in my experience seen any problems with using a Good Quality
> Cat5 vs. Cat 3 (telco standard) cable for X-connects.  YMMV, but you
> should be fine. As far as the shielding goes, I use UTP cables and
> Connectors all the time and some of my X-connects run over 100 feet.
Thanks for the info!

Should I use a T1 cross cable to connect the telco's socket to the 
TE410P card?

When I tried straight cat5 cables, both leds remained red at each end. 
However this E1 socket works fine with the Matra PBX, so it must be a 
cable problem or TE410P misconfiguration.

Thanks,


Here  is my configuration:

/etc/zaptel.conf:

	span=1,1,0,ccs,hdb3,crc4
	span=2,1,0,ccs,hdb3,crc4
	span=3,1,0,ccs,hdb3,crc4
	span=4,1,0,ccs,hdb3,crc4

	bchan=1-15,17-31
	dchan=16

	bchan=32-46,48-62
	dchan=47

	bchan=63-77,79-93
	dchan=78

	bchan=94-108,110-124
	dchan=109

	loadzone=fr
	defaultzone=fr

/etc/asterisk/zapata.conf:

	;; to telco
	context=default
	signalling=pri_cpe
	group = 1
	channel => 1-15
	channel => 17-31

	;; to old pbx
	context=international
	signalling=pri_net
	group = 2
	channel => 32-46
	channel => 48-62

> Can't anyone stop self-promotion and tell the poor guy what he needs.
> 
> A T1/E1 X-over cable using an RJ-45 (8-cond.) is pinned out as follows:
> 
> 1 - 4
> 2 - 5
> 3 - NU
> 4 - 1
> 5 - 2
> 6 - NU
> 7 - NU
> 8 - NU
> 
> NU = Not Used
> 
> I have not in my experience seen any problems with using a Good Quality
> Cat5 vs. Cat 3 (telco standard) cable for X-connects.  YMMV, but you
> should be fine. As far as the shielding goes, I use UTP cables and
> Connectors all the time and some of my X-connects run over 100 feet.
It would probably be helpful for everyone reading this thread to 
understand what the differences are in the two types of cables. 
Primarily impedance matching, twists per foot, shielding, etc.

For short runs, the use of cat5 vs proper T1 cables isn't likely to have 
any impact unless there is a fair amount of induction from electrical 
noise, etc. That can take the form of florescent fixtures, transformers, 
older CRT monitors, etc, etc.

On longer runs, the shielded T1 cables are likely to provide better 
results particularly if there happens to be any electrical noise.

Oh, and if shielded T1 cable is used, the shield at each end of the 
cable must be grounded. (Let's see how many can figure out how to do 
that via an rj45 plug. ;)