NEC QX-S5500G Series Installation Manual page 150

Installation Guide
QX-S5500G Series Ethernet Switches
Category
Category-5e
Category-6
Category-6A
2) Pinouts
When connecting a MDI port to an MDI-X port a straight-through cable is used, when
connecting two MDI ports or two MDI-X ports a crossover cable is used.
Auto-MDIX detects if the connection would require a crossover, and automatically chooses
the MDI or MDIX configuration to properly match the other end of the link.
Straight-through: Pinouts of Straight-through cable is shown in Figure 10-7. The

pinout in both ends is based on the 568B standard.
Crossover: Pinouts of 10/100/1000BASE-T crossing cable is shown in Figure 10-8.

The 10/100/1000BASE-T crossing cable is different from a 100BASE-TX crossing
The cable provides performance of up to 100 MHz and is suitable for a max speed of
1000Mbps.
The cable provides performance of up to 250 MHz and is suitable for a speed higher
than 1Gbps.
The cable provides performance of up to 500 MHz and is suitable for a speed higher
than 1Gbps.
Figure 10-7 Straight-through cable
Straight-through cable
10-13
10. Appendix C Ports and LEDs
Specification
1
white/orange
2 orange
white/green
3
4
5
white/blue
6
7
white/brown
8
brown
1
white/orange
2
orange
3 white/green
4
5
white/blue
6
7
white/brown
8
blue
green
blue
green
brown