Black Box MultiPower Miniature LGC120A-R2 Manual De Usuario
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Los códigos de productos
LGC120A-R2
BLACK BOX
®
3 of 7
9/25/2012
#10858
Power Tray (LHC018A-AC-R2) filled
with Miniature Media Converters.
100-Mbps Ethernet.
100BASE-T: an overview.
100BASE-T, also known as Fast Ethernet, is a high-speed
version of the 10BASE-T Ethernet standard. 10BASE-T data and
100BASE-T data are essentially the same: The only difference is
that to attain higher data throughput, the 100BASE-T standard
reduces the latency period between data bits. This increases
data throughput from 10 to 100 Mbps. You can build a network
that’s entirely Fast Ethernet, you can use it as a VLAN, or you
can deploy Fast Ethernet as an “island” within your 10-Mbps
Ethernet network.
100BASE-T data are essentially the same: The only difference is
that to attain higher data throughput, the 100BASE-T standard
reduces the latency period between data bits. This increases
data throughput from 10 to 100 Mbps. You can build a network
that’s entirely Fast Ethernet, you can use it as a VLAN, or you
can deploy Fast Ethernet as an “island” within your 10-Mbps
Ethernet network.
Here are the most common 100BASE-T standards endorsed by
the Institute of Electrical and Electronic Engineers (IEEE):
100BASE-TX.
100BASE-TX.
100BASE-TX is the most popular Fast Ethernet standard.
100BASE-TX operates over Category 5 or higher cable and uses
two pairs of wires, which enables it to support both half- and full-
duplex operation. Because Category 5 or higher cable is used in
many existing 10BASE-T networks, 100BASE-TX is also the most
convenient way to implement Fast Ethernet into an existing
10-Mbps network.
two pairs of wires, which enables it to support both half- and full-
duplex operation. Because Category 5 or higher cable is used in
many existing 10BASE-T networks, 100BASE-TX is also the most
convenient way to implement Fast Ethernet into an existing
10-Mbps network.
As with 10BASE-T, distances between devices in a 100BASE-
TX network cannot exceed 100 meters (328 ft.), though the use
of extenders and line drivers can increase this distance somewhat.
This distance limitation applies to both full- and half-duplex
operation.
100BASE-FX.
of extenders and line drivers can increase this distance somewhat.
This distance limitation applies to both full- and half-duplex
operation.
100BASE-FX.
100BASE-FX, the fiber version of Fast Ethernet, supports half-
and full-duplex network operation over single-mode or multimode
duplex fiber optic cable.
duplex fiber optic cable.
Because fiber optic cable has such a high performance
capacity, 100BASE-FX is ideally suited for use as a back bone cable
or an extra-long Ethernet connection—for example, a building-to-
building link.
or an extra-long Ethernet connection—for example, a building-to-
building link.
Over fiber, the maximum distance for a cable is 412 meters
(1351.7 ft.) in half-duplex mode and 2 kilometers (1.2 mi.)
in full-duplex mode.
100BASE-T4.
in full-duplex mode.
100BASE-T4.
This is the least popular of the 100BASE-T standards.
100BASE-T4 uses only three pairs of wires for data transfer
and one for collision detection. So, unlike 100BASE-TX
and 100BASE-FX, 100BASE-T4 can only support half-duplex
network operation. This significantly limits its use because
100-Mbps islands are normally added to networks to support
high-bandwidth, full-duplex network applications. According
to some sources, less than 1% of 100BASE-T applications
use 100BASE-T4 and many manufacturers have completely
discontinued 100BASE-T4 product lines.
and one for collision detection. So, unlike 100BASE-TX
and 100BASE-FX, 100BASE-T4 can only support half-duplex
network operation. This significantly limits its use because
100-Mbps islands are normally added to networks to support
high-bandwidth, full-duplex network applications. According
to some sources, less than 1% of 100BASE-T applications
use 100BASE-T4 and many manufacturers have completely
discontinued 100BASE-T4 product lines.
The advantage of 100BASE-T4 is that it operates over
Category 3, 4, and 5 cable and functions quite well in noisy
environments—giving the standard an element of flexibility in UTP
Fast Ethernet applications not shared by 100BASE-TX
or 100BASE-FX. The distance limitations for the 100BASE-T4
standard is the same as 100BASE-TX: 100 m (328 ft.).
Why replace 10BASE-T Ethernet?
environments—giving the standard an element of flexibility in UTP
Fast Ethernet applications not shared by 100BASE-TX
or 100BASE-FX. The distance limitations for the 100BASE-T4
standard is the same as 100BASE-TX: 100 m (328 ft.).
Why replace 10BASE-T Ethernet?
Fast Ethernet hasn’t come close to completely replacing
10BASE-T Ethernet, but in some cases, 10BASE-T simply
can’t keep up with new multimedia applications and large files
that have become a large part of many corporate networks.
can’t keep up with new multimedia applications and large files
that have become a large part of many corporate networks.
(continued on page 4)
Technically speaking
NOTE: The LHC040A-R2 and LHC041A-R2 operate at 850-nm
wavelength, so they meet the 100BASE-SX standard.
wavelength, so they meet the 100BASE-SX standard.
NOTE: Multipower Miniature Media Converters do not work with a
10BASE-FL fiber interface.
10BASE-FL fiber interface.