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5.1 | |
Cabling the LAN | |
| 5.1.6 | |
Repeaters |
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The term repeater comes from the early
days of long distance communication. The term describes the situation
when a person on one hill would repeat the signal that was just
received from the person on the previous hill. The process would
repeat until the message arrived at its destination. Telegraph,
telephone, microwave, and optical communications use repeaters to
strengthen signals sent over long distances. A repeater receives a signal, regenerates it, and passes it on. It can regenerate and retime network signals at the bit level to allow them to travel a longer distance on the media. The Four Repeater Rule for 10-Mbps Ethernet should be used as a standard when extending LAN segments. This rule states that no more than four repeaters can be used between hosts on a LAN. This rule is used to limit latency added to frame travel by each repeater. Too much latency on the LAN increases the number of late collisions and makes the LAN less efficient.
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