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Infastructure - Fast Ethernet
Fast Ethernet is 100 Base-T
technology defined in the 802.3 standard which provides
for both homogeneous CSMA/CD100 Mbps networks and
heterogeneous 10/100 Mbps mixed networks.
Both network topologies can be
supported by connecting various LAN segments using
repeaters, switches,bridges or routers.
There are three categories of Fast
Ethernet:
- 100 Base-TX (two-pair
Category, 5 UTP cabling)
- 100 Base-T4 ( four-pair
Category 3, 4 or 5 UTP cabling)
- 100 Base-FX ( two-strand fiber
cabling 62.5/125(, multimode cable)
The topology rules for Fast
Ethernet differ from 10Mbps Ethernet.
The key topology rules are:
- Maximum UTP cable length is
100 meters (305ft) over Category 5 cable.
- A 450 meter fiber optic run
using standards compliant half duplex 100 Base-FX
is allowed for connecting :
- switch to switch
- End station to switch.
- A total network span of 325
meters is allowed in single-repeater (one hub
stack per wiring closet with a fiber run to the
collapsed backbone)
- 255 meters fiber downlink from
a repeater to a router switch plus 100 meter UTP
run from a repeater out to the desktops.layout.
A proposal to IEEE 802.3 for a
100Mbps Ethernet-like network. Borrows the physical
characteristics of FDDI's multimode fiber PMD, but uses
Ethernet framing & CSMA/CD. One of three flavors of
"100BASE-T" proposed by the Fast Ethernet
Alliance. Formerly part of 100BASE-X proposal.
Proposed IEEE 802.3 standard for a
100Mbps Ethernet-like network. One of the flavors of
"100BASE-T" proposed by the Fast Ethernet
Alliance. Uses 8B6T encoding and 25MHZ clocking, and in
addition to the two pairs traditionally used in the
manner of 10BASE-T, also has two pair used in
bidirectional half-duplex fashion. Among other things,
this means that this particular kind of Ethernet cannot
be made full duplex without the use of more pair.
Formerly called 4T+.
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