Compaq NC7131 Gigabit Server Adapter User Guide

C-2 Compaq NC7131 Gigabit Server Adapter User Guide
UTP Cable Specifications
To connect to the network, the NC7131 adapter uses the following cable for 1000Base-T
transmission.
■ Category 5 or better UTP twisted-pair
■ 22-26 AWG, 100Ω at 1 MHz
■ EIA/TIA 568a or EIA/TIA 568b
Using UTP Category 5 Cable in Gigabit over Copper Installations
For Gigabit over copper installations, UTP Category 5 or better 1000Base-T cable must comply
with the IEEE 802.3ab 1000Base-T standard. For new installations, Category 5e (enhanced
Category 5) or better cable is recommended. Maximum distances for Gigabit over copper cable
are 100 meters (328 feet).
RJ-45 Pinouts and Crossover Function
The Ethernet standard also specifies that each segment implement a crossover function to
connect the transmitter of one device to the receiver of a device at the other end, and vice-versa.
The crossover function may be implemented internally at the hub or switch, or externally
through the twisted-pair media.
10/100 Straight-Through Pinouts
If the crossover function is implemented internally, the port is labeled MDI-X (Medium
Dependent Interface–Crossover). When an MDI-X port is connected to an MDI port, the twisted
pair media should be wired straight-through using the physical pinouts indicated in Table C-2.
Table C-2
10/100 Pinouts Using Internal, Straight-Through Crossover
Pin Function Color Match Function Pin
1 TD+ White/Orange TD+ 1
2 TD- Orange/White TD- 2
3 RD+ White/Green RD+ 3
4 Blue/White 4
5White/Blue5
6 RD- Green/White RD- 6
7White/Brown7
8Brown/White8
Figure C-1 shows the straight-through 10/100 connector wiring to be used when the crossover
function is implemented on the hub or switch.