Detection of loop-back conditions on faulty digital trunks
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United States of America Patent
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Sep 14, 1999
Grant Date -
N/A
app pub date -
Feb 20, 1998
filing date -
May 11, 1995
priority date (Note) -
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Abstract
A method of detecting loopbacks on trunks in digital networks, comprises the steps of detecting an out-of-service trunk, continually placing a predetermined bit pattern on an outgoing channel of a trunk card, continually monitoring a receive channel of the trunk card to detect said bit pattern, and identifying the presence of a loopback when said bit pattern is persistently detected on the receive channel. This method avoids the need to dedicate a trunk channel for signaling purposes. By detecting the presence of loopbacks, intelligent networks can be prevented from unjustifiably clearing an alarm condition and returning traffic to a fault path.
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