SR NWT 001756 : ISSUE 1
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The latest, up-to-date edition.
This document complements GR-253, "Synchronous Optical Network (SONET) Transport Systems: Common Generic Criteria", by giving tutorial text and state transition tables. Automatic Protection Switching (APS) is an optional feature for Line Terminating Equipment (LTE) that is used to improve the availability and reliability of transport systems by substituting a standby facility when failures occur.
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