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*100BaseT4 for four-pair voice and data grade Category 3,4 or 5
UTP
*100BaseFX for 2-strand multimode fiber
Media Access Control (MAC) Layer
The MAC layer is based on the same CSMA/CD protocol as
10Mbps Ethernet. The only difference is that it runs 10times
faster.
Media Independent Interface (MII) Layer
The MII is a new specification that defines a standard interface
between the MAC layer and any of the three physical layers
(100BaseTX, 100BaseT4 or 100BaseFX). It is capable of
supporting both 10Mbos and 100Mbps data rates.
100BaseTX Physical Layer
This physical layer defines the specification for 100BaseT
Ethernet over two pairs of Category 5 UTP or Type 1 STP twisted
pair wire. With one pair for transmit and the other for receive, the
wiring scheme is identical to that used for 10BaseT Ethernet. The
UTP connector, a RJ-45, is also identical to the one used for
10BaseT Ethernet. However, the punch-down blocks in the wiring
closet must be category 5 certified
A-2. Fast Switching Technology
There are two big LAN killers: increased demands that new
technology, such as multimedia and videoconferencing, places on
available bandwidth; and the distributed computing architecture
trend being driven by mature implementations of the client/server
model of corporate computing. With a high-speed switch
backplane, it is possible to have all ports communicating at wire
speed with minimal latency and low packet loss.