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9.3 Components Used For a 100-Mbps Connection

Physical Layer Device

The next device in the block diagram is called the Physical Layer Device (PHY). This device performs the same general function as a transceiver in the 10-Mbps Ethernet system. It may be a set of integrated circuits inside the Ethernet port of a network device, therefore invisible to the user, or it may be a small box equipped with an MII cable, like the outboard transceiver and transceiver cable used in 10-Mbps Ethernet.

Quick Reference Guide to 100-Mbps Media Systems - 09 SEP 95
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