23 Jan
2018
23 Jan
'18
1:17 p.m.
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.
https://catalog.belden.com/techdata/EN/89880_techdata.pdf
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.