Path: utzoo!attcan!uunet!mcvax!ukc!dcl-cs!aber-cs!dap
From: dap@aber-cs.UUCP (Dave Price)
Newsgroups: comp.dcom.lans
Subject: Thin Ethernet cable ??
Message-ID: <750@aber-cs.UUCP>
Date: 10 Mar 89 13:04:00 GMT
Reply-To: dap@aber-cs.UUCP ()
Organization: UCW,Aberystwyth,WALES,UK
Lines: 41

Frustration on our site is growing rapidly as to which
thin coax is 'correct' for thin ethernet.

1/.Several manufacturers/vendors simply say  RG58 while
other most definitely specify RG58A/U with others
equally emphatically state RG58C/U !!!

2/.Observation of the various cable specs seem to
say that even saying RG58A/U (for instance) does
not always get you the same cable.

3/.Many people now seem to be having cable with 'foam'
as apposed to solid dielectric.

4/.Some cable has a propagation velocity of
66% light speed while other has 77 or 78%.

Buying what you believe to be the 'correct' cable,
only to discover that some other expert tells you
'that wont work at 185 Metres' is very annoying.

A separate and equally frustrating problem is the length
of cable sections and distances between joints etc.
We often read 0.5 metres between 'tee' connectors, but
what about simple joints ??


We run a cable along an office row with boxes on the walls
with two bncs fitted. We then run two fly leads from the box
to the tee on the back of the machine. If a machine is removed
we insert one fly lead from one bnc to the other.
How long must my fly leads be ?? If I have no machine
in this office and just loop the bncs how long can
that lead be ?? 4 inches ?? or must it be 0.5 metres ??

Dave Price

-- 
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Post: University College of Wales, Penglais, Aberystwyth, UK, SY23 3BZ.