F5-to-F4 OAM alarm notification and cell generation in multiple connection ATM switches
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United States of America Patent
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Mar 8, 2005
Issued Date -
N/A
app pub date -
Dec 17, 1999
filing date -
Dec 17, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of identifying a segment and end-to-end OAM flow VPC context table for one of a plurality of VCCs corresponding to the VPC. Each VCC has a context table. Each VCC context table has a pointer. The pointer contains the address of the context table for the segment and end-to-end OAM flow VPC. Provisioned connections supported by the ATM switching system are repeatedly scanned. If a VCC has an active F4-to-F5 OAM process, the pointer is extracted from that VCC's context table, identifying the context table of the corresponding segment and end-to-end OAM flow VPC. If the VPC is in the VP-AIS alarm state, the current VCC outputs a VCC-AIS cell. A continuity check is repeatedly performed by updating the appropriate F4 OAM connection context table whenever a VCC cell is received on a corresponding F5 connection, preventing the F4 connection from raising a continuity check alarm.
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