Itt Corporation

Transwitch Corporation

Alcatel N.v.

U.S. Holding Co., Inc.

Jitender K Vij

John A Yanosy, Jr

Eugene P Gerety

Santanu Das

Daniel C Upp

Subhash Chandra Roy

Michael M Renault

William Lipp

Frederick R Carter

Rajen S Ramchandani

John P Hufnagel

Anthony J Dennett

Paul Oldyzko

A network switch includes at least one port processor and at least one switch element. The port processor has an SONET OC-x interface (for TDM traffic), a UTOPIA interface (for ATM and packet traffic), and an interface to the switch element. In one embodiment, the port processor has a total I/O bandwidth equivalent to an OC-48, and the switch element has 12&times;12 ports for a total bandwidth of 30 Gbps. A typical switch includes multiple port processors and switch elements. A data frame of 9 rows by 1700 slots is used to transport ATM, TDM, and Packet data from a port processor through one or more switch elements to the same or another port processor. Each frame is transmitted in 125 microseconds; each row in 13.89 microseconds. Each slot includes a 4-bit tag plus a 4-byte payload. The slot bandwidth is 2.592 Mbps which is large enough to carry an E-1 signal with overhead. The 4-bit tag is a cross connect pointer which is setup when a TDM connection is provisioned. The last twenty slots of the frame are reserved for link overhead. Thus, the frame is capable of carrying the equivalent of 1,680 E-1 TDM signals. For ATM and packet data, a PDU (protocol data unit) of 16 slots is defined for a 64-byte payload. The PDUs are self-routed through the switch with a 28-bit routing tag which allows routing through seven switch stages using 4-bits per stage. Bandwidth is arbitrated among ATM and Packet connections while maintaining TDM timing.

Network switch which supports TDM, ATM, and variable length packet traffic and includes automatic fault/congestion correction

Method for switching ATM, TDM, and packet data through a single communications switch

An apparatus for use with a DMA controller includes a device interface controller having therein both general and specific command programs, and device bus interface. The apparatus is arranged to intercept all communication signals between the DMA controller and a microcomputer associated therewith.

Device interface controller for intercepting communication between a

An apparatus for controlling a plurality of peripherals attached to a common high speed parallel bus, includes a first program therein, which program includes a fixed set of generalized command and control instructions and a device specific program therein, which device specific program includes command and control instructions for a plurality of different devices.

Device interface controller having device specific and device common

A system for providing data services in an evolutionary fashion as well as providing access to external data communication networks for subscribers to a circuit switched voice exchange includes a data services adjunct connected in series with presently existing voice communication paths.

System for providing data services to a circuit switched exchange

A data transport control apparatus including a storage medium independently accessible by a device interface controller for interconnecting the storage medium and peripherals, a communication bus control for interconnecting the storage medium and a communication bus and a microprocessor bus for interconnecting the storage medium and a microcomputer wherein all interconnections to the storage medium are effectively isolated from each other.

Data transport control apparatus

A full service voice/data system includes a networking medium having a plurality of substantially identical subsystems interconnected thereto. Each subsystem includes a local voice information path and a local data information path, the local data information path including a masterless multiple access contention bus with collision detection.

Full service voice/data system

A communication subsystem includes a plurality of peripheral interface devices, one or more network interface devices and, optionally, one or more gateway interface devices. Each and every interface device includes a uniform data transport controller that autonomously controls data traffic across the device associated therewith and executes all requisite communication protocol conversions.

Growing community of inventors

Trumbull, CT, United States of America

Jitender K Vij