[AusNOG] Cable length limits?

[Steve Smalley]

Back when I was learning the ropes I recall being told something similar... 100m limit for cat5 (I don't think c5e was around at the time).  And due to this I tend to stick to it but can't for the sake of me remember exactly who what where when or why.

However when there are considerable distances I try to budget for either a fibre run or a radio/microwave link or similar.  These bring into other considerations again (which you've no doubt read throughout this forum in the past) but that is my (simplistic) rule of thumb.
As far as temperature goes, well....  most of the longer cat5e/6 runs I've done have been from one aircon'd server room/cabinet through an underground pit to another aircon room (further to this most of my work has been in SE QLD & Northern NSW...  Nth Qld is a different kettle of fish again).  But I would expect the temperature difference to be somewhat negligible in those cases...  but if they're doing a cat 5e/6 run over that distance they must be made aware there will be some sort of loss regardless of temperature and that's yet another variable that needs to be considered.  as per always there are ifs and buts you need to consider

Kind Regards,

Steve Smalley
IT Systems Engineer
TRIMBLE NETWORKS PTY LTD
PO Box 3195, NEWSTEAD QLD 4006 
2/48 Eagleview Place, Eagle Farm QLD 4009 
p: (07) 3852 4498 | f: (07) 3852 4829 
w: www.trimblenetworks.com.au
e: SSmalley at trimblenetworks.com.au


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-----Original Message-----
From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Paul Gear
Sent: Tuesday, 4 March 2014 8:53 PM
To: ausnog at lists.ausnog.net
Subject: [AusNOG] Cable length limits?

Hi all,

I'm working on a project involving a new facility being built in Townsville.  A consultant on the project mentioned to me today that he had heard some discussions which suggested that the maximum distance of 90m on a Cat5e/Cat6 run applies to environments where the ambient temperature is around 20 degrees, and that higher temperatures can actually require lower length limits.

Can anyone confirm or deny, and/or point to some relevant references?  
Google seems to have some relevant hits, but discerning the wheat from the chaff is tricky - many of the first few hits for the searches I did were from companies trying to sell higher grade cabling.

Thanks in advance,
Paul

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