Interface Card and Interface Module Manual
H3C MSR 20/30/50 Series Routers
Chapter 3 Multifunctional Interface Modules
3-3
Figure 3-4
Ethernet cable
II. 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,
z
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.
z
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.
3.1.5 Connecting the Interface Cable
Step 1: (Use a crossover cable for the connection to a PC/router and 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.
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.
