Question

Maximum length of demarc extention for T1 HDLC

Asked by: ClayShooter

We have some new customers who are having AVPN circuits from AT&T installed.  Many of the sites are using old house wiring (22AWG 25 pair) to run from the NIU upwards of 400+ feet to the CSU.  Some sites are taking intermittent errors and AT&T is constantly testing clean to the NIU.

What is the normally accepted maximum length of an extention from the NIU to the CSU using the above type cabling and PPP or HDLC encapsulation on the T1?  I've had past bad luck with anything over 325-350 feet but would love to hear others' experience.

Thanks.

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Asked On
2009-09-29 at 11:06:17ID24771011
Tags

Network T1 demarc length

Topics

Miscellaneous Networking

,

Networking Cables

Participating Experts
2
Points
500
Comments
4

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Answers

 

by: jmeyer17Posted on 2009-09-29 at 11:26:31ID: 25451801

Max length is 325 but can be extended with repeaters.  Here is a thread with some additional info.
http://www.velocityreviews.com/forums/t33955-extended-demarc.html

 

by: ClayShooterPosted on 2009-09-29 at 11:34:33ID: 25451867

The guy that mentioned 325' worked with me on the project mentioned in that thread.  Even then, I wasn't completely sold on that number as I have never seen this particular length in print anywhere else.  I think he got it from empirical data during the project, but I was looking for something that is somewhat of a telco standard.

I've mentioned T1 repeaters to the customer, but he is adamant that 600' isn't too long for a T1 demarc extension.  That's why I was looking for something to present to him.

 

by: lrmoorePosted on 2009-09-29 at 19:29:37ID: 25455295

 

by: lrmoorePosted on 2009-10-09 at 14:44:04ID: 25539136

Any more questions? Have we answered your original question?

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