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Layer 1 - Physical Layer
The physical layer is the
carrier for the actual data between two or more devices.
Its function is to convert the data into a format suitable
for transmission on the side of the connection that is sending
data, and convert the transmitted data to a format meaningful
to the device(s) on the receiving side of the connection. Part
of this overall mission includes:
- The Physical interconnection with the physical
media (cable, discussed in the last chapter).
- The electronic specifications and Mechanical
requirements such as, the connector standards, and the
duty of each pin, including voltage (+/-).
The OSI Layer 1 job function is not the same as the cable topology discussed earlier. For example, Ethernet can function over a Bus or Star topology, using coax, twisted pair, or fiber-optic cable. Sometimes the physical cable topology is called unofficially Layer 0.
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CertiGuide for Network+ (http://www.CertiGuide.com/netplus/) on CertiGuide.com
Version 1.0 - Version Date: November 7, 2004
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