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Cisco Intelligence Engine 2100 Series Configuration Registrar Manual
OL-1570-01
Chapter 2 Preparing for Installation
Preparing Your Site for Installation
The Ethernet configuration using unshielded twisted pair (UTP) wire is known as 10BaseT because it
uses 10 megabits per second (Mbps) signaling speed, direct current, or baseband, signaling, and twisted
pair wire.This configuration includes a central wiring hub with special circuitry to isolate
malfunctioning segments of the network. UTP wire uses an RJ-45 connector at each end of the wire. New
signaling schemes such as 100BaseT and gigabit Ethernet use the same UTP cabling with upgraded hubs
and adapters.
Use a CAT 5 UTP cable at minimum to connect to a 100BaseT network. Use a CAT 3 UTP cable at
minimum to connect to a 10BaseT network.
Table 2-1 on page 2-7 shows the pinouts for a straight-through 100BaseT cable.
Table 2-2 shows the pinouts for a crossover 100BaseT cable.
Table 2-1 Straight-Through 100BaseT Cable (RJ-45 to RJ-45) Pinouts
RJ-45 Pin Signal Direction RJ-45 Pin
1 TX+ —> 1
2 TX- —> 2
3 RX+ <— 3
4— —4
5— —5
6 RX- <— 6
7— —7
8— —8
Table 2-2 Crossed-Over 100BaseT Cable (RJ-45 to RJ-45) Pinouts
RJ-45 Pin Signal Direction RJ-45 Pin
1 TX+ —> 3
2 TX- —> 6
3 RX+ <— 1
4— —4
5— —5
6 RX- <— 2
7— —7
8— —8