A standard network cable tester for RJ45 (Ethernet) and RJ11 (telephone) cables features a main unit and a remote, with LED indicators to show wire continuity and correct connections on both units.
 The specification involves compatibility for RJ11, RJ12, and RJ45 connectors and requires a 9V battery for power. 
Key features are the ability to detect open circuits, short circuits, and crossed wires, providing a rapid test by auto-scanning and indicating errors with flashing or non-illuminating LEDs.