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From: hayes@blaise.trl.OZ.AU (Mark Hayes)
Newsgroups: comp.dcom.lans
Subject: Intelligent Twisted Pair?
Keywords: twisted pair wiring
Message-ID: <1991May19.235055.23105@trl.oz.au>
Date: 19 May 91 23:50:55 GMT
Article-I.D.: trl.1991May19.235055.23105
Sender: news@trl.oz.au (USENET News System)
Reply-To: hayes@blaise.trl.OZ.AU (Mark Hayes)
Organization: Telecom Research Laboratories, Melbourne, Australia
Lines: 29

I have just seen an article which mentions "Intelligent" Twisted
Pair cable manufactured by Cabling Communications Consultants Ltd.
(Farnborough, UK). Apparently this cable is better than unshielded
twisted pair and cheaper and less bulky than shielded twisted pair.
CCC claim that its cable can accommodate 200 token ring stations 
(4 or 16 Mbit/s) over 200 metres.

Does anyone have any technical details regarding this cabling, or 
does anyone have any experience with it?

I am not too familiar with physical layer restrictions on token
rings. I assume that the attenuation per unit length is the same
(or similiar) between the different cabling systems (assuming same
wire gauge) and the limiting factor is crosstalk/interference. As
STP reduces crosstalk/interference, then greater distances are 
possible (yes/no?). I would assume that the ITP cable reduces the
crosstalk/interference below that of UTP, thus enabling their
better performance figures. I also assume that this applies to 
networks which are "star wired", thus having multiple stations 
(on different pairs) in a cable.

Any comments? If anyone has an idiot's guide to token ring cabling
I would appreciate a copy.

Cheers,
mdh
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Mark Hayes					Research Labs,
m.hayes@trl.oz.au				Telecom Australia