Cable length on T1

[thrtnastrx]

I want to connect two routers together via T1 but the two buildings are about 1200 feet apart. They are tied together with CAT-3 cable. Does anyone know if that will work? I can use a T1 crossover cable and tie them together back to back in my office but that cable is only 10 feet long. Does anyone know what the maximum cable length between the two routers?

 

[robertjo24]

With a good quality cable, 22AWG, individually sheilded pairs, about 655'.

If you have a stadard multi-conductor voice grade cable between buildings, you may get less distance without errors.

If you are going 1200', try a T1 extender. Patton makes one, (model 2115) link below. We use their ethernet extenders and they work just fine.

http://www.patton.com/products/pe_products.asp?category=368&tab=fb&MiDAS_SessionID=

 

[unclerico]

can i ask a seemingly stupid question here?? why copper?? if you have them physically connected with cat3 cable why not purchase some fiber modules for the routers and run some fiber??

I hate all Uppercase... I don't want my groups to seem angry at me all the time! =)
- ColdFlame (vbscript forum)

 

[OzzieGeorge]

Ok

I may get contradicted here but being from a telephony background.....

You need a transmit pair and a recieve pair. and the cable has 4 pairs, so if you want to increase the distance try doubling up the pairs. The standards are a guideline only (not absolute), try the extra distance it may work, it may be unacceptable but as I said.... It may work. The copper is in situ all you are wasting is your time!

However if it does work, monitor it to make sure it is really acceptable when you get traffic on it.

 

[robertjo24]

Ozzie, it realluy isn't quite that simple. It is not a factor of cable resistance, it is more frequency responce over a longer distane, factoring in noise, cable capacitance, etc.

Directly connecting a T1 between routers over that distance, (if it even connects), will most likely result in significant errors on the serial interface side of the router interface.

It does not seem that fiber is a possibility, unless you can pull in fiber withthe copper, or use the copper to pull in the fiber.

 

[thrtnastrx]

I think the T1 extender is the best idea for this job. Thanks for you help.