Data link layer processor system for a local exchange system

Data network switch with fault tolerance

Data synchronization system for redundant packet routing...

Demand data distribution system

Determining rerouting information for single-node failure...

Device and method of performing a switching control to standby s

Device for ATM cell switching, with failure tolerance

Device for duplicating connectionless server

Device for selecting normal circuit in communication system

Dial plan transparency for fragmented networks

Disaster recovery via alternative terminals and partitioned...

Distributed control methodology and mechanism for implementing a

Distributed control packet transmission

Distributed digital cross-connect system and method

Distributed digital cross-connect system and method

Distributed protection switching

Distributing fault indications and maintaining and using a...

Dual SVC system for ATM device

Dual transmission spread processing circuit system for CDMA...

Dual-homing layer 2 switch