TSD-2000-3-3 OPTICAL FIBRE CABLING: POLARITY MAINTENANCE Issue 3
The majority of optical fibre transmission systems deliver a signal in one direction on one optical fibre and receiving a signal on another, separate optical fibre. Groups of applications covered by such signalling schemes include virtually all of the local and wide area network technologies.
In the past the management of polarity of such transmission channels was the responsibility of the user and was achieved by the correct connection of equipment cords at either end of the installed cabling (in many cases by simple trial and error).
The growth in popularity of duplex and array interfaces, which prevents simple re-configuration of the equipment cords, requires that recommendations be prepared to allow management of channel polarity in the most appropriate manner. In addition, future network solutions may utilise parallel optical fibre elements terminated with array interfaces.
This document provides such recommendations and, providing that its recommendations are followed, allows users and installers to clearly specify the polarity maintenance approach in order to maximise channel reliability.