On 04/25/06 05:58 Sangoma Techdesk said the following:
At Sangoma we do quite a lot of back-to back T1 and E1
connections. T1 is not a very fussy connection, as the baud
rate is only about 750 kbps.
In our experience, for error free communications you can use
the following rules of thumb:
Also note that the Smart Jack allows the Telco to provide T1
Signalling in places that it couldn't in the past, most smart jacks
that I have used are:
[CO]-Optical-[Hut DMS]--[Hut Smart Jack]-HDSL-[CPE Smart Jack]
For the list, Telco Techs, mostly do as they are told, and are
schooled by the
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
Rich Adamson wrote:
snip
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
Leo Ann Boon wrote:
Rich Adamson wrote:
snip
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.
I was once told by a lineman that the cables they use didn't have that
many twists in them because it wasn't needed, and that the extra twists
would effectively use more cable and thus cost and weigh more than
triple what they do now. He told me that with the number of twists in
the Cat 5 cable it
My telco used cat5 as well for the demarc to CPE. It's also with noting that
many channel banks, such as my Atlas, and zapata.conf itself also have
parameters to allow you to tune the gains to compensate for cable signal
loss. I've never had to touch them, and my CPE is about 300 feet from the
PRI
Alexander Lopez wrote:
I was once told by a lineman that the cables they use didn't have that
many twists in them because it wasn't needed, and that the extra twists
would effectively use more cable and thus cost and weigh more than
triple what they do now.
Good thing he doesn't work for a
On Mon, 24 Apr 2006, Rich Adamson wrote:
Alexander Lopez wrote:
I was once told by a lineman that the cables they use didn't have that
many twists in them because it wasn't needed, and that the extra twists
would effectively use more cable and thus cost and weigh more than
triple what they
Rich Adamson wrote:
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. ;)
You use shielded plugs and jacks, of course :-) That is why the
TE405P/TE410P have shielded jacks (as of about
On Monday 24 April 2006 12:13, Kevin P. Fleming wrote:
Minor point: isn't it safer to only ground the shield on one end?
Yes, you *never* shield both ends. That can cause ground loops and add to the
long list of what the..? head-scratching problems that telephony has.
As to WHICH end to
Kevin P. Fleming wrote:
Rich Adamson wrote:
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. ;)
You use shielded plugs and jacks, of course :-) That is why the
TE405P/TE410P have
At Sangoma we do quite a lot of back-to back T1 and E1
connections. T1 is not a very fussy connection, as the baud
rate is only about 750 kbps.
In our experience, for error free communications you can use
the following rules of thumb:
Up to 50 ft: Flat patch cable
Up to 500 ft: Ordinary
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
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