sundance-communications.com/forum Forums Wiring - Telecom Carriers - Trunks & Services T1's, CSU's and DSU's T1 terminations

I have had an ongoing disagreement about extending some T1 lines for a customer. I have a 50 pr terminated on ctt5e patch panels at each end and was wondering if I can extend them through that path? If so what exactly would I need to do at each end? Another issue has arisen on a few short T1 extensions using unshielded cat5e cable and rj45 jacks at each end? Ideally I'd like to always do everything by the standards but when dealing with a customer who does not want to spend $$ it makes it hard. Thanks

I don't know of any standards for T-1 extensions, I have always ran 4 pair cat5E and have never had any problems. Don't listen to me though, there are many better phone techs here that may have the answer that you are looking for.

How far are you extending it? Unless it quite a ways you shouldn't have any problems.

Will:

You can't extend a T1 circuit using an RJ45 since that's only a one-pair wiring pattern. You would need to use the RJ48 wiring pattern in order to extend a T1. The transmit and receive pairs for each circuit should also reside under separate cable jackets to minimize interference.

You can probably get away with a standard 568A or 568B cable for very short runs, but I would not advise going more than a patch cord's length. You need to maintain the RJ48's shorting bar configuration to make sure that the circuit stays alive when the cable is unplugged.

HERE is some information regarding the RJ48 connection that you will need along with information about the the "RJ" misnomers. I think that you will find it helpful.

Will -

We always ran 2 shielded cables - one for transmits, the other for the receives.

We terminated the T's on RJ48Xs or DSX bays.

I have extended T-1s for short distances (<50')on Cat 5E cable. I don't recommend it for distances any greater than that.

Sam

I did extend one at the direction of a national about 200ft on CAT5 in one sheath. I told them no guarantees, but it must have worked as I haven't been back. All I know is they had sync when I left.

Ed's lesson on the jack nomenclature is correct. I always seem to read right past that as it's become so common place, although wrong.

I ran into a client that decided at one point to bury their own cable, pulled Cat6 through it, and was extending T1 and Ehternet (with no protection/LRE) about 800'.

They had network issues but surprisingly the T1/Channel Bank worked.

Wow. If T1 is working consistently, then that could be some sort of record? As for ethernet, the wire is exhibiting the expected properties - per the standard, max segment distance is 328 ft for ethernet over UTP, regardless of the category.

Why wouldn't T1 work on cat6, or 5, or even 3. Think about how it gets from the C.O. to the customer. Some sort of carrier/fibre, maybe. But, in the end it's probably coming into the building to the smart jack on cat3 at best! I've seen it run 500+ feet on random lay quad, and no one was more surprised than the LEC that did it out of desperation, because no 'suitable' facilities were available! Maybe I live in 'lucky-land', but once every channel on a T1 was up and completely usable for a week, they 'ran and ran and ran' until something was damaged, like cable pairs. Unlike PRI's, I might add. Altho, around here, a PRI may come from 1 of 3-4 different providers, always on the same ILEC cable. Since the LECS have no idea what's going on at the competition, there may be the explanation. John C. (Not Garand)

All that's before the line conditioning equipment.