These switch modules use 2 pole relays to provide one pair based on the EIA/TIA 568 pin out for RJ45 connectors. 

RJM/2(1×4) Modules are used to build 32×4 or dual 16×4 configurations.
Hot switch +/- 200 Volts, +/- 2 amps. Total of up to 60 Watts.
Will hot switch PoE signals without adaptors!
Passes all CAT5E cable tests.
Switch 2 wires, pins 3 and 6
CAT5E RJ45 connectors.