Multiplex communications – Pathfinding or routing – Through a circuit switch
Patent
1995-05-12
1997-02-18
Olms, Douglas W.
Multiplex communications
Pathfinding or routing
Through a circuit switch
370462, H04Q 1104
Patent
active
056047355
ABSTRACT:
The present invention provides an improvement in circuit switching for a network comprising a switching apparatus including a plurality of transceivers for interfacing directly with a like plurality of nodes. Each of the transceivers has a receive and transmit through port for passing data to and from nodes. Transmitted data includes a connect/disconnect sequence, a first wait sequence, and user data. The switching apparatus further includes circuitry for isolating each transceiver so as to loop back data when not in use and a switching matrix for directly connecting any pair of transceivers. Each of the transceivers includes circuitry for detecting a connect and disconnect sequence and an interface for connection to a serial asynchronous receiver to derive node requests, routing data, priority and other information from the connect sequence detected at the transceiver. Derived switch configuration requests are processed by a node route control state machine, with each node route control state machine integrated in a bus architecture for configuring the matrix switch. A bus arbitration state machine controls the bus architecture servicing bus requests and providing bus grants for the transfer of routing information to switch control logic and a command sequencer. The requesting node may set a priority for a connection request, queue a connection request or alternatively request data from the switch controller micro-controller core.
REFERENCES:
patent: 5267235 (1993-11-01), Thacker
patent: 5425031 (1995-06-01), Otsuka
patent: 5444700 (1995-08-01), Martikainen et al.
"Application Note: Using the Buil-in Test/Diagnostics Port on FTR-XX10 Transceivers, FTM-XX10 Transmitters, FRM-XX10 Receivers," Finisar, Feb. 1994.
Farley Mark J.
Leung Calvin P.-K.
Levinson Frank H.
Vu Minh Q.
Finisar Corporation
Olms Douglas W.
Ton Dang
Williams Gary S.
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