Method and system for hit-less switching
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United States of America Patent
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Feb 27, 2001
Grant Date -
N/A
app pub date -
Nov 5, 1998
filing date -
Nov 5, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system and method are disclosed for processing digital signals in a telecommunications system that allow hit-less switching between a first digital signal in which a first payload, a first payload indicator marker and a first overhead are transported on a first channel, and a second digital signal in which a second payload identical to the first payload, a second payload indicator marker and a second overhead are transported on a second channel. The present invention includes first and second pointer followers, first and second elastic buffers with control circuits, a monitor circuit, a multiplexer, and a pointer generator. The first and second elastic buffer control circuits each further comprise a write counter, a read counter, a phase detector, and a leak-out mechanism for reinitializing the system after a protection switch. The present invention hit-lessly selects between the first and second digital signals without having to frame align the signals.
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