3Com MSR 30, MSR 20, MSR 50 manual MIM-1GBE/MIM-2GBE, Module, Making Ethernet cable

MIM-1GBE/MIM-2GBE Module 69

Figure 66 Ethernet cable

Making Ethernet cable

Category 5 twisted pairs are adopted for making Ethernet cables. Each category 5 twisted pair is composed of 8 cores that are identified and grouped by color of insulation sheath. Usually a solid color wire and the white/solid color wire for it are in pairs. But sometimes, wires are also paired by color dots.

Ethernet cables fall into two categories: straight-through cables and crossover cables, specifically,

■Straight-through cable: The sequences of the twisted pairs crimped by RJ-45 connectors at both ends are the same. It is used for the connection between a terminal device (e.g., PC and router) and a Hub/LAN Switch. The cables delivered with the Router are straight-through cables.

■Crossover cable: The sequences of the twisted pairs crimped by RJ-45 connectors at both ends are different. It is used for the connection between terminal devices (e.g., PC and router).And it can be made by the user.

For the pinouts of straight-through Ethernet cable and crossover Ethernet cable, see Low-End and Mid-Range Series Routers Cable Manual.

Connecting the Interface	Step 1: (Use a crossover cable for the connection to a PC/router and
Cable	straight-through cable to a Hub/LAN Switch.) Plug one end of the cable to an
	Ethernet port of the Router and another end to the desired peer device;
	Step 2: Check the status of LINK LED on the FE module panel: ON means the link is
	connected and OFF means the link is not connected. In the latter case, check the
	line.
c	CAUTION: You should connect a cable to the port with the correct mark.
	Misplugging is prone to impair the SIC/MIM and even damage the Router.
MIM-1GBE/MIM-2GBE
Module
Introduction	1-port 10Base-T/100Base-TX/1000Base-T Ethernet electrical interface module
	(MIM-1GBE) and 2-port 10Base-T/100Base-TX/1000Base-T Ethernet electrical
	interface module serve to complete the communication between a router and a
	LAN.
	The GBE (Gigabit Ethernet) supports:
	■ Transmission distance up to 100 meters over the category 5 twisted-pair cable;