Abstract: A portable cable identifier and tester assembly for a four line token ring network type cable, including a first unit having a power supply and connector mateable to one end of the cable and a second unit mateable to ends of potentially matching cables to provide a signal indicating cable identification. Jumpers are provided in each of the units to ensure that the test signal current is routed through all four wires and connectors. Shorting bars between cable lines in unmated connectors, and spurious personal computer supply voltages, do not inhibit cable identification. User ease and self-test are inherent features.