EXFO RTU 310-310G IP Services Test Head - Manual (Page 467)

Specifications
Ethernet Test Module 455
Specifications for RTU-310
Ethernet Cables
Minimum Category 3 cable is required for 10Base-T connection while
Category 5 cable is required for 100Base-T and 1000Base-T connections.
Maximum cable length (between two nodes) for 10Base-T, 100Base-T, or
1000Base-T connection is 328 feet (100 meters).

Straight Through Cable (10/100 Mbps)
An Unshielded Twisted Pair (UTP) straight through cable is required to
connect a 10/100Base-T RTU-310/310G port to a layer 1 or 2 device (ex:
HUB, switch).

Crossover Cable (10/100 Mbps)
An Unshielded Twisted Pair (UTP) crossover cable is required to
connect the 10/100Base-T RTU-310/310G port to a layer 3 device (ex:
router).