OPTISCHES UBERTRAGUNGSNETZWERK

摘要

A means for simplifying fault location in an optical signal transmission network in which a main optical fibre is divided into a plurality of branch circuits, comprises optical time domain reflectrometry (OTDR) equipment for transmitting an output signal along the main fibre, and for each branch circuit means for causing the signal returned to the OTDR equipment from the branch to be modified in a manner unique to that branch.