Multiplex communications – Fault recovery – Bypass an inoperative station
Reexamination Certificate
2002-11-22
2009-02-03
Ho, Duc C (Department: 2619)
Multiplex communications
Fault recovery
Bypass an inoperative station
C370S395100, C370S224000, C370S227000, C709S239000
Reexamination Certificate
active
07486613
ABSTRACT:
The present invention discloses a protection-switching apparatus and method in an asynchronous transfer mode (ATM) system with ring topology. In the invention, the ONU detects a trouble, or abnormal states, of an optical path connected with the ONU itself; the ONU performs the protection-switching function by receiving an ATM cell from the opposite direction of the optical path having the trouble; the software unit of the ONU inserts a node identification data (NID) of the ONU to the APS register of the optical path of normal states; and the hardware unit of the ONU generates the APS cell by performing mirroring of the APS register to the VCI area of the APS cell, and transmits the APS cell in the same direction as the direction of the optical path of abnormal states. Therefore, the protection-switching apparatus and method in an ATM system with ring topology of the present invention have the advantage of reducing switching delay time and switching load.
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“The Token-Bank Leaky Bucket Mechanism for Group Connections in ATM Networks” by Sheng-Lin Wu and Wen-Shyen E. Chen.
“Effectiveness of the ‘Leaky Bucket’ Policing Mechanism in ATM Networks,”IEEE Journal on Selected Areas in Communications, vol. 9, No. 3, by M. Butto, E. Cavallero, and A. Tonietti on Apr. 1991.
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Annex A “Guidelines for Use of ATM Address Formats”.
Annex B “Compatibility Checking”.
Annex C “B-LLI Negotiation”.
Annex D “Transit Network Selection”.
Annex E “Cause Definitions”.
Annex F “ATM Adaption Layer Parameters Negotiation”.
Appendix A “Quality of Service Guidelines”.
Appendix B “Conformance Examples in a Traffic Contract”.
Appendix C “Point-Multipoint Signalling Procedures Using Separate State Machines(Information)”.
Appendix D “Example Signalling Codings”.
Appendix E “Differences with ITU-T draft Recommendation Q.2931”.
Appendix F “Guidelines on the use of Bearer Class, Traffic Parameters and QoS”.
Appendix G “OAM Cell Error Detection Code Field”.
Appendix H “Glossary”.
Bushnell , Esq. Robert E.
Ho Duc C
Samsung Electronics Co,. Ltd.
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