Understanding the network.pdf - Back to Home

cable segment length (for coaxial standards) or the transmission medium type (for
everything else).
• 10Base-5—Also known as "Thicknet," 10Base-5 is virtually identical to the
DIX Ethernet II standard, except for the framing type, which is IEEE 802.3.
10Base-5 uses thick 50-ohm coaxial cable (sometimes called Xerox wire) for
the transmission medium. Its data transmission rate is 10Mbps, with a
maximum of 100 users per segment. Up to four repeaters can be used to
extend the backbone cabling length up to 500m, with a maximum total
backbone length of 2500m. Only three of the cable segments can be used to
attach end-stations. The unusable lengths are called inter-repeater
backbone links. This topology requirement is known as the 5-4-3 rule: 5
cable segments, 4 repeaters, 3 usable cable segments. Alternatively,
network expansion can be implemented with the use of bridges between
separate cable segments. Figure 4.10 illustrates a 10Base-5 topology
utilizing repeaters and bridges.