Hit-less protection switching method and apparatus for ATM trans

Details Hit-less protection switching method and apparatus for ATM trans Hit-less protection switching method and apparatus for ATM trans

1991-08-14

1994-05-24

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

340827, H04B 174, H04L 102

Patent

active

053155815

ABSTRACT:
A hit-less protection switching method and apparatus therefor for ATM transmission lines for selecting first cells from normal received signals and writing the same into a normal cell buffer, selecting second cells from emergency received signals and writing the same into an emergency cell buffer, reading the first cells from the normal cell buffer after a first delay time, reading the second cells from the emergency cell buffer after a second delay time, comparing the contents of the first cell with the contents of the second cell and changing the difference between the first delay time and the second delay time, when a state of discrepancy between the contents of the first cell and the contents of the second cell is continuously detected for a predetermined time, to dissolve the state of discrepancy, and selecting one of the cells read from the normal cell buffer and the emergency cell buffer with a delay as communications information.

REFERENCES:
patent: 4477895 (1984-10-01), Casper et al.
patent: 4630265 (1986-12-01), Sexton
patent: 4799237 (1989-01-01), Itoh
patent: 5051979 (1991-09-01), Chaudhuri et al.
"Hit-less Portection Switching Technique for ATM Network", B-722.

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