Notes:
From http://www.faqs.org/faqs/LANs/ethernet-faq and http://www.ethermanage.com/ethernet/enet-faqs/ethernet-faq.html
10BaseT generally accepted to have a maximum run of 100-150M, but is really based on signal loss in Db's (11.5db maximum loss source to destination). 10BaseT is the most flexible topology for LANs, and is generally the best choice for most network installations. 10BaseT hubs, or multi-hub concentrators, are typically installed in a central location to the user community, and inexpensive UTP cabling is run to each network device (which may be 100m, or 330ft, from the hub). The signalling technology is very reliable, even in somewhat noisy environments, and 10BaseT hubs will usually detect many network error conditions and automatically shut-down the offending port(s) without affecting the rest of the network (unless, of course, the offending port was your server, shared printer, or router to the rest of the world). While the hardware is more expensive than 10Base2, the cabling is cheaper and requires less skill to install, making 10BaseT installation costs only slightly higher than 10Base2. The flexibility and reliability more than offset the marginally higher price.
The propagation speed of a medium refers to the speed that the data travels through that medium. Propagation delays differ between mediums, which affect the maximum possible length of the Ethernet topology running on that medium. In the following table, c refers to the speed of light in a vacuum, or 300,000 kilometers per second.
Medium Propagation Speed
Thick Coax .77c (231,000 km/sec)
Thin Coax .65c (195,000 km/sec)
Twisted Pair .59c (177,000 km/sec)
Fiber .66c (198,000 km/sec)
AUI Cable .65c (195,000 km/sec)