Active Loop Test Device
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
This article shows how a loop communication system having a main loop and an alternate loop for fault bypass can be tested by one person using two test boxes. Each test box contains a transmitter and receiver operating at normal loop frequencies. The tester can detect crossed cable wiring at each terminal connection point, that is, the upstream loop cable segment erroneously wired to the downstream connecting terminals.