Installation Guide
QX-S5500G Series Ethernet Switches
10-14
cable. The pinout of a 100BASE-TX crossing cable in one end is based on the 568B
standard, and other is based on the 568A standard. By the way, the pinout of a
10/100/1000BASE-T crossing cable in one end is based on the 568B standard, and
other isn’t based on the 568A standard.
Figure 10-8
Crossover cable
（
10Base-T/100Base-TX/1000Base-T
）
IV.
Pin arrangement of RJ45 port
Pin arrangement of RJ45 port is MDI (Router or PC) shown in Table 10-12 or MDI-X
(Switch) shown in Table 10-13.
Table 10-12
Pin arrangement of MDI
Pin
10BASE-T/100BASE-TX
1000BASE-T
Signal
Specification
Signal
Specification
1
Tx+
Transmission
BIDA+
Two directions A+
2
Tx-
Transmission
BIDA-
Two directions A-
3
Rx+
Receive
BIDB+
Two directions B+
4
Non-data
-
BIDC+
Two directions C+
5
Non-data
-
BIDC-
Two directions C-
