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golfer78

@rr.com

t1

hey,could someone out there help me regarding a typical niu for a t1 circuit, im a telco tech for the port of los angeles,my questions are,directly from a rj45 port from a niu going directly to a router do i use a standard cat5e patchcord or a crossover cable,and if after i plug it in and the alarm light on the niu goes away,if the custermer still cant see the connection is it a problem with t1 and or router

imseanbrown
Premium
join:2005-12-20
New York, NY
586A/B wiring won't work for a T1...

DESCRIPTION PIN # COLOR
Receive from Network (ring) 1 Blue/White
Receive from Network (tip) 2 White/Blue
Transmit from Network (ring) 4 Orange/White
Transmit from Network (tip) 5 White/Orange

imseanbrown
Premium
join:2005-12-20
New York, NY

2 edits
reply to golfer78
funny -- 586B should work... have you verified your cable works?

here's some more information I ran across which might be useful

If you are extending the DEMARK more than 15 feet, you should follow the following:

Make sure you use D-shield cable, which is CATEGORY 5 shielded. Each pair MUST be shielded, not an overall foil wrap. It you use overall foil wrap cable, you must run 2 lines, one for transmit and one from receive to the extended DEMARK. This minimizes cross talk between pairs.

You must use a CATEGORY 5 patch cord 15 feet or less from your equipment to the RJ-45 (RJ48C-RJ48X) connector.
--
Sean.Brown@clearlinknetworks.com

CLEAR LINK Networks, Inc.

319 Clematis Street

Third Floor - Suite #301

»www.clearlinknetworks.com


(561)253-6500


Splitpair
Premium
join:2000-07-29
Cow Towne
kudos:3

3 edits
reply to golfer78
said by golfer78 :

hey,could someone out there help me regarding a typical niu for a t1 circuit, im a telco tech for the port of los angeles,my questions are,directly from a rj45 port from a niu going directly to a router do i use a standard cat5e patchcord or a crossover cable
You can use a standard patch cord, do keep in mind the DS1 signal utilizes pins 1,2 and 4,5.

and if after i plug it in and the alarm light on the niu goes away,if the custermer still cant see the connection is it a problem with t1 and or router
I could be either, to eliminate the circuit place a loopback plug (x-jack) 1 to 4 and 2 to 5 on the Smartjack and see if they can float LMI or see the loopback from the other end if so that eliminates the circuit as a problem.

Wayne
--
If you cannot fix it with a buttset and some beanies you're not a technician.


Splitpair
Premium
join:2000-07-29
Cow Towne
kudos:3

1 edit
reply to imseanbrown
said by imseanbrown:

funny -- 586B should work... have you verified your cable works?

here's some more information I ran across which might be useful

If you are extending the DEMARK more than 15 feet, you should follow the following:

Make sure you use D-shield cable, which is CATEGORY 5 shielded. Each pair MUST be shielded, not an overall foil wrap. It you use overall foil wrap cable, you must run 2 lines, one for transmit and one from receive to the extended DEMARK. This minimizes cross talk between pairs.
That is not really required one can run a DS1 up to about 130 feet over standard non-shielded CAT3 or better cable without a problem, to run further the Line Build Out (LBO) of both the Smartjack and the CSU/DSU must be set for the proper distance.

You must use a CATEGORY 5 patch cord 15 feet or less from your equipment to the RJ-45 (RJ48C-RJ48X) connector.
Again negative any Telco or network cable CAT 3 or better will work just fine at that distance.

Wayne
--
If you cannot fix it with a buttset and some beanies you're not a technician.

Hahausuck
Premium
join:2003-12-14
kudos:2
I concur with Splitpair

I just rolled out a new microwave hop with TDM circuits and Ethernet. The TDM circuits are extended from the SJ to a distance of 80 some feet. Two cross connects through the NOC's 110 panels which are wired with regular old CAT5 cable and over our own CAT5 drop to the MUX.

On the other end of the microwave it hops a buried 25pr 22awg cable across the hill to another site and dumps out there. Total run is around 120 feet. LBO is set for 0-133.

Also working on another multi-site microwave system with many TDM cross connects and those are again, done with CAT5. Could we use CAT3? sure. The cables from the MUX to the DSX panels are 25pr 22AWG. No big deal
--
"No job is so important, and no service is so urgent that we cannot take the time to perform our work safely."
-- AT&T, Your World, Destroyed.
--Safety One Tower Rescue Certified
--LLigetfa:"Wimax is like teenage sex. Everyone talks about doing it."


LazMan
Premium
join:2003-03-26
canada
reply to golfer78
Also agree with Splitpair...

The gauge of the wire will make FAR more distance then the twist... in other words, 22ga Cat3 will be a better choice then 24 ga Cat5. I extend T1's in one of my buildings over 400' on 22ga POTS wiring, no issues... We do, however, split TX and RX into seperate cables (we've got 600 pair running between the rooms, and about 80 T1's running over it)

To the OP: What sort of router, and what sort of interface?