3Com 3C13886 Installation Guide - Page 115
Table 4-2, Description, Ethernet cable
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3Com Router Module Guide Chapter 4 Figure 4-1 Router 2-Port 10/100 panel The following table describes the LEDs on the Router 2-Port 10/100 panel. Table 4-2 LEDs on the Router 2-Port 10/100 panel LED Description LINK OFF means no link is present; ON means a link is present. ACTIVE OFF means no data is being transmitted or received on the interface and blinking means data is being transmitted and/or received. 4.1.5 Interface Cable I. Ethernet cable As shown in the following figure, the Ethernet cables for Router 2-Port 10/100 cards are category-5 twisted pairs with RJ-45 connectors. Pins 1 and 2 of the interface are used for transmitting data, and pins 3 and 6 are used for receiving data. Figure 4-2 Ethernet cable II. Making Ethernet cables 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. z 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 4-6