X21 Distance limitations

Unanswered Question
Sep 27th, 2007

What is the maximum cable length for X21 for a 4Mb and a 2Mb link?

I have this problem too.
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paul.matthews Thu, 09/27/2007 - 09:11

Hi Carl, X.21 is really the protocol, with X.24 covering the cabling.

http://www.itu.int/rec/T-REC-X.21/en

http://www.itu.int/rec/T-REC-X.24/en

X.24 is really helpful and says that cable length is limited by the spec of the interchange circuits.

So, to the BT site as a best fuess to who the provider may be - there is no technical info I can find for Megastream, only kilostream (includes Kilostream N), where a max length of 10M is specified.

http://www2.bt.com/static/i/media/pdf/kilostream_network_terminating.pdf

Paul.

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