NS3550-8T-2S Industrial Managed Switch User Manual
450
Appendix A
Networking connection
RJ45 port pin assignments – 1000Mbps, 1000BASE-T
Pin number
MDI
MDI-X
1
BI_DA+
BI_DB+
2
BI_DA-
BI_DB-
3
BI_DB+
BI_DA+
4
BI_DC+
BI_DD+
5
BI_DC-
BI_DD-
6
BI_DB-
BI_DA-
7
BI_DD+
BI_DC+
8
BI_DD-
BI_DC-
Implicit implementation of the crossover function within a twisted-pair cable, or at a
wiring panel, while not expressly forbidden, is beyond the scope of this standard.
10/100Mbps, 10/100BASE-TX
When connecting the industrial managed switch to another Fast Ethernet switch, a
bridge, or a hub, a straight or crossover cable is necessary. Each port of the industrial
managed switch supports auto-MDI (Media Dependent Interface)/MDI-X (Media
Dependent Interface Cross) detection. This makes it possible to directly connect the
industrial managed switch to any Ethernet device without making a crossover cable.
The following table and diagram show the standard RJ45 receptacle/ connector and
their pin assignments.
Pin number
MDI
MDI-X
1
Tx + (transmit)
Rx + (receive)
2
Tx - (transmit)
Rx - (receive)
3
Rx + (receive)
Tx + (transmit)
4, 5
Not used
6
Rx + (receive)
Tx + (transmit)
7, 8
Not used