Control system for switching duplicated switch units in ATM exch

Details Control system for switching duplicated switch units in ATM exch Control system for switching duplicated switch units in ATM exch

1992-11-06

1994-04-05

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 60, 370 601, 370 941, 340827, H04L 1256, H04Q 1104

Patent

active

053011848

ABSTRACT:
In a control system for switching between a first system and a second system of a duplicated selecting structure in an ATM exchange, one of the first and second systems operates as an active system, and the other operates as a standby system. A generator unit writes specific bits into ATM cells received via an input transmission line. The specific bits respectively written into ATM cells to be transferred via the active system indicate a first state, and those respectively written into the ATM cells to be transferred via the standby system indicate a second state. A first table stores the specific bits respectively assigned to VPI/VCI pairs related to the ATM cells transferred via the first system. A second table stores the specific bits respectively assigned to VPI/VCI pairs related to the ATM cells transferred via the second system. A selecting unit compares the specific bits written into the ATM cells with the specific bits stored in the first and second tables by using the VPI/VCI pairs of the ATM cells, and outputs only ATM cells respectively having specific bits respectively indicating the first state to an output transmission line.

REFERENCES:
patent: 5067123 (1991-11-01), Hyodo et al.
patent: 5072440 (1991-12-01), Isono et al.
patent: 5084867 (1992-01-01), Tachibana et al.
patent: 5119369 (1992-06-01), Tanabe et al.
patent: 5153578 (1992-10-01), Izawa et al.
patent: 5191577 (1993-03-01), Uchida et al.

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