3com MSR 20-20 사용자 설명서

Figure 171   Ethernet cable

You can use category 5 twisted-pair cables to make Ethernet cables. A category 5 
twisted-pair cable is composed of eight wires that are identified and grouped by 
colors of the outer insulator. Usually a solid color wire and a white/solid color wire 
are organized in pairs. But sometimes, wires are also paired by color dots.

Ethernet cables fit into two categories: straight-through and crossover.

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Straight-through cable: The wires are crimped in the RJ-45 connectors at both 
ends in the same order. The cable is used for connecting a terminal device (for 
example, PC or router) to a HUB or LAN switch. The cables delivered with the 
router are straight-through cables.

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Crossover cable: The wires are crimped in the RJ-45 connectors at both ends in 
different orders. The cable is used for connecting two terminal devices (for 
example, PC and router). You can make cables as needed.

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Step 1: Plug one end of the cable to an Ethernet port on the router and another 
end to the device to be connected. (For a PC or router, use a straight-through 
cable; for a HUB or LAN switch, use a crossover cable.)

Step 2: Power on the router and check the behavior of the LINK LED on the FIC-FE 
panel: ON means that a link is present and OFF means that no link is present. In 
the latter case, check the line status.

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FIC-1GBE/FIC-2GBE, the 1-port/2-port 10Base-T/100Base-TX/1000Base-T Ethernet 
electrical interface card, is used for router-to-LAN communication.

The cards support:

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100 meters (328.1 ft.) of transmission segment over the category-5 
twisted-pair cable.