Multiplex communications – Wide area network – Packet switching
Patent
1993-03-08
1997-05-27
Beausoliel, Jr., Robert W.
Multiplex communications
Wide area network
Packet switching
370248, 370397, G06F 1100, H04L 1256
Patent
active
056340974
ABSTRACT:
A method and apparatus of tracing VP's (virtual paths) wherein operational information of VP connectors are collected through OAM (operation and maintenance) cells. The VP connectors establish a connection at a VP level within a network in which the cells are transferred in an ATM (asynchronous transfer mode). Each VP connector detects an OAM cell for VP tracing as received from another of the VP connectors, and judges if an area for affixing the operational information in the VP connector itself exists in the detected OAM cell. In the VP connector when the area exists, the detected OAM cell is specified to be the OAM cell for writing the operational information thereinto, and the specified OAM cell is sent out after affixing the operational information thereto. When the area does not exit, the OAM cell received from the other VP connector is sent out after indicating therein that the received OAM cell is not the rearmost cell, the OAM cell for the VP tracing is generated anew, and the generated cell is sent out after indicating therein that the generated OAM cell is the rearmost cell. Also the operational information is affixed to newly generated OAM cell.
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Ashi Yoshihiro
Fujita Toshihiko
Matsunaga Haruhiko
Ueda Hiromi
Beausoliel, Jr. Robert W.
Hitachi , Ltd.
Le Dieu-Minh
Nippon Telegraph and Telephone Corporation
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