Propagation delay is dependent upon a variety of factors and while the numbers the article quotes may be correct for thick-net and thin-net, the cable we use fo

Propagation delay is dependent upon a variety of factors and while the numbers the article quotes may be correct for thick-net and thin-net, the cable we use for CATV trunk-line is significantly faster at about 0.85c (http://www.china-satellite.com/sdp/1385167/4/pd-5853918/8382534-2286595/RG540_QR540_QR540JCA_QR540JCAM109_Trunk_Line_Cable.html http://www.china-satellite.com/sdp/1385167/4/pd-5853918/8382...). Interestingly, the propagation delay through single-mode fiber tends to be significantly lower than through copper (well ... again it depends on the cable), but the 0.66c speed is a pretty good number for fiber.