Experimental Ethernet, XGP, etc.

Glen Slick glen.slick at gmail.com
Tue Jan 23 15:17:57 CST 2018

On Tue, Jan 23, 2018 at 11:15 AM, Paul Koning via cctalk
<cctalk at classiccmp.org> wrote:
> The cable spec given in the Ethernet standard doesn't mention additional shielding.  It does differ from RG-8 in that it calls for foam dielectric and a higher velocity factor (0.77 rather than 0.66).  Another common difference (not required by the spec) is that RG-8 is polyethylene while Ethernet coax is usually PTFE.

FWIW, here is a spec sheet for Belden 89880 Thicknet 10BASE5 cable,
which apparently DEC used for their part number 17-00324-00 cable.


It does mention a Nominal Velocity of Propagation (VP) of 78%, and
Ring-band stripes every 2.5 meters to aid users in tap placement,
among other specifications.

You could buy a 1000-ft spool on eBay for only $480, vs $9,818 at Mouser.

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