Thanks Jenny, This table was the American equivalent of the UK table I saw with E1 at approx 8 metres. Everything I found suggested the same. I've had a bit of an argument with a company who swore blind that the 20 metres was well within limits and insisted that the install go ahead. Now I'm having to move the router and run twisted pair. Your confirmation is good enough for me - I'm off for an argument :-)
Thanks, Gaz wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > 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=28822&t=28752 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
