Black Box LIC022A-R2 Datasheet download pdf (Page 3)

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Power Tray (LHC018A-AC-R2) filled

with Industiral MultiPower

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.

Here are the most common 100BASE-T standards endorsed by

the Institute of Electrical and Electronic Engineers (IEEE):

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.

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.

100BASE-FX, the fiber version of Fast Ethernet, supports half-

and full-duplex network operation over single-mode or multimode

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.

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.

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.

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

(continued on page 4)

Technically Speaking

Industiral MultiPower

Media Converters.

installed on a DIN rail

Go the distance with fiber.

The converters using multimode fiber support distances of up to

984.2 feet (300 m) or 1.2 miles (2 km)—enough distance for most

LAN applications. For more extensive campus applications, choose

Single-Mode or Single-Mode, Single-Strand models for long-distance

runs of up to 6.2, 12.4, 24.8, or 43.5 miles (10, 20, 40, or 70 km).

More power to you.

Industrial MultiPower Media Converters can be powered one of

four ways: by an external AC power supply included with each unit,

by using 5–50-VDC terminal block power, by an optional USB Power

Adapter Cable that plugs into a PC’s USB port, or by an optional

rackmount PowerTray.

Plus, Industrial MultiPower Media Converters are designed for use

in harsh industrial environments.

The AC power supply is a universal external transformer that

requires a nearby AC power outlet. The PowerTray provides power for

up to 18 converters in only 1.5U of rack space. Rackmount ears are

included.

You can even use multiple power options at the same time to

provide maximum redundancy and ensure that your mission-critical

applications remain up and running. For instance, you can connect a

converter to a 5–50-VDC power source while also using AC adapter

power and USB bus power. Then, if any one of these power sources

fails, the other sources will continue to supply power to the converter

seamlessly.

The converters come with DIN clips, so you can attach them

to a DIN rail. When installing multiple Industrial MultiPower Media

Converters on a DIN rail, use one DC input source, then cascade

from one DC block to the next until you reach the maximum current

available.

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