
Lantronix
SISTP1040-551-LRT Install Guide
33841 Rev. A
11
Ground Connection
The switch must be properly grounded for optimum system performance. Use 18 AWG minimum, green and
yellow wires.
Ethernet Interface Connection (RJ45 Ethernet)
The switch provides two types of interfaces: electrical (RJ45) and optical (SFP). To connect the Ethernet interface
via RJ45:
1. Connect to a PC using a straight-through or a crossover Ethernet cable.
2. Connect the switch to an Ethernet device using UTP (Unshielded Twisted Pair) or STP (Shielded Twisted
Pair) Ethernet cables.
The pin assignment of RJ-45 connector is shown in the table and figure below.
Pin
Assignment
802.3af/at
Assignment
802.3bt
Assignment
1, 2
T/Rx+, T/Rx-
Negative V
Port
Negative V
Port
3, 6
T/Rx+, T/Rx-
Positive V
Port
Positive V
Port
4, 5
T/Rx+, T/Rx-
X
Positive V
Port
7, 8
T/Rx+, T/Rx-
X
Negative V
Port