There is a table that seems to be reproduced in many parts of CCO, in the
installation guides...
http://www.cisco.com/univercd/cc/td/doc/product/core/cis7505/portadpt/serial/pa_4t/2660over.htm#19815
Table 1-1.
This claims that the maximum distance for X.21 at T1 speed is 15 metres.
Being US-centric, it doesn't bother mentioning a maximum distance for those
of us who use 2 Mbps ;-) but basically the distance gets shorter as the
speed gets higher.
All versions of the table that I have spotted give distances for lower
speeds (2400 bps, 4800 bps, etc up to 56 kbps) and then jump to 1544 kbps,
so it's a bit difficult to extrapolate, but I'd guess that an 8 metre limit
for 2 Mbps may be being cautious and a 20 metre limit may be being
optimistic.
I'm afraid I can't give any practical examples - I've only used standard
short Cisco cables for speeds above 64 kbps.
JMcL
----- Forwarded by Jenny Mcleod/NSO/CSDA on 11/12/2001 11:32 am -----
"Gaz"
cc:
Sent by: Subject: x21 workable cable
length at 2Mb
nobody@groups
[7:28752]
tudy.com
11/12/2001
09:04
am
Please
respond
to
"Gaz"
Hi all,
Could I have a concensus of opinion please for maximum workable cable
length
for a CABX21 - MT running at 2Mb.
Seen various web pages which suggest differing lengths, and I suppose,
depending how old the web page is, it may differ.
I have a 20m cable working fine at 512k, but having problems at 2Mb over
the
same cable. Pretty sure it is the distance problem and we're changing to
G703 to get round it, but would like to know where the cut off is for 2Mb.
I believed it to be about 25 feet (8m) prior to this install, but was
assured that 20m would be OK.
Thanks,
Gaz
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=28779&t=28752
--------------------------------------------------
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
