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C-2 HP NC7770 PCI-X Gigabit Server Adapter User Guide
UTP Cable Specifications
To connect to the network, the NC7770 Server Adapter uses the following cable for
1000BASE-T transmission.
Category 5 UTP or better
22-26 AWG, 100Ω @ 1MHz
EIA/TIA 568a or EIA/TIA 568b
Using UTP Category 5 Cable in Gigabit Over Copper Installations
For Gigabit over copper installations, Category 5 UTP 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.
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
5 White/Blue 5
6 RD- Green/White RD- 6
7 White/Brown 7
8 Brown/White 8
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.