100BASE-T FAST ETHERNET

A system designed to achieve 100 Mbps access time on Ethernet
networks, which is 10 times the speed of standard Ethernet. The IEEE*
amended the 802.3 specifications to include 100 BaseTX, 100 BaseT4
and 100 BaseFX. 100 BaseT is configured in a star topology and therefore
requires the use of a hub. Signals are transmitted from a central hub
directly over one cable segment to the NIC's. Fast Ethernet makes use of
the same CSMA/CD access method allowing multiple devices to operate
while avoiding transmission collisions. Although Fast Ethernet works at
10 times the speed of standard Ethernet, it also operates at over 10 times
less the maximum allowable network diameter - from 2500 meter to 210
meters over copper.
There are two classes of repeaters (hubs) in 100 BaseT - Class I and
Class II. When using Class I, data should not pass through more than
one repeater and two 100 meter cable segments. Class I has a latency
of .7 or less microseconds. When using Class II, data should not pass
through more than two repeaters, two 100 meter cable segments and
one 10 meter interrepeater link. Class II has a latency of .46 or less
microseconds (latency is the waiting time).

The same rules apply as for 10BaseT except as noted above.
The 100BaseT standard is made up of 3 versions:

100BASE TX is full-duplex capable in point to point unshared
applications because it uses 1 pair to receive and 1 pair to transmit.
Designed to run over 2 pairs of category 5 unshielded twisted pair cable
with RJ45 connectors and EIA/TIA 568B pinning. It can also be run on
IBM type 1 sheilded twisted pair (existing Token Ring wiring) with an
impedence matching device and DB9 connectors or regular STP and
DB9 connectors. Max segment length is 100m.

100BASE T4 designed to run over 4 pairs of category 3, 4 or 5 UTP
cable with RJ45 connectors and EIA/TIA 568B pinning. It can also be
run over STP. 1 pair is used to receive while 3 pairs are used to transmit,
however full-duplex operation does NOT work because specific pairs
are not designated to transmit or receive. Max segment length is 100m.

100BASE FX designed to run over 2 strands of duplex multimode fiber
optic cable. It's also full-duplex capable because it uses one strand for
receive and one for transmit. Maximum cable segment varies depending
on the cabling used. Singlemode (depending on the manufacturer) can
exceed 10 km when full-duplex. Multimode maximum length is 412 meters
for half-duplex and 2 km ful-duplex. Max length from station to repeater is
150 meters.

NOTE: For full-duplex operation on 100BASE TX or FX:
1) devices must support full-duplex
2) connection must be unshared end to end.

	This Diagram is a combination of 10Base-T and 100Base-TX. The layout can be changed depending upon your networking needs.

1. 10/100 Mbps Ethernet Switch
2. Cross Pinned Cat5 UTP Cable
3. Straight Pinned Cat5 UTP Cable
4. Cat5 Wallplate Assembly
5. Cat5 Color Coded Patch Cables
6. 10 Base-T Network Card
7. 10 Base-T Ethernet Hub
8. 100 Base-T Network Card
9. 100 Base-T Fast Ethernet Hub