On Tue, Jan 23, 2018 at 11:15 AM, Paul Koning via cctalk <cctalk@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.
