Abstract

A new system has been designed to provide protection switching capability for the L5 repeatered line. This line-protection switching system, called lpss−3, provides one standby line for protection of as many as 10 service carrying lines. Switching equipment is located in terminal, terminal main, and switching power-feed stations. Economic and reliability considerations allow switching spans of up to 150 miles. Either temperature pilot deviations or excessive total signal energy initiates automatic switching. Manual control of all switching functions is provided locally and via telemetry. A dedicated pcm signaling system maintains interstation switching system coordination. Identical information is transmitted in complem entary form over two adjacent L5 channels. Parity and complementary checking as well as automatic retransmission of failed codes enhances error immunity.

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