H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 12/56 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 2292352
A method of identifying a segment and end-to-end OAM flow VPC context table for any one of a plurality of VCCs correspon- ding to the VPC. A context table is provided for each VCC. A pointer is provided in each VCC context table. The pointer contains the address of the context table for the segment and end-to-end OAM flow VPC. Once every 500 msec, all provisioned connections sup- ported by the ATM switching system are scanned. In the case of a VCC having an active F4-to-F5 OAM process, the aforementioned pointer is extracted from that VCC's context table, thereby 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, then the current VCC is caused to output a VCC-AIS cell. A continuity check is performed once every 1,000 msec by updating the "CCcount" field in 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 ("CCalarm"). A similar check is performed if a plurality of F5 connections are aggre- gated into an F4 connection. Whenever a VCC cell is transmitted, the CCcount field in the F4 OAM connection context table is updated, preventing the VPC from entering a CCalarm condition, as aforesaid. If no VCC cells are transmitted on any of the VPC's VCCs, then the VPC is declared to be in CCalarm condition within 3.5 ~0.5 seconds.
Oyen Wiggs Green & Mutala Llp
Pmc-Sierra Inc.
LandOfFree
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