Michael R English

US Patent:

51950901, Mar 16, 1993

Filed:

Jul 9, 1991

Appl. No.:

7/727498

Inventors:

Brian D. Bolliger - Winfield IL
Talmage P. Bursh - South Orange NJ
Marc K. Dennison - Berkeley Heights NJ
Michael J. English - Aurora CO
Charles Y. Farwell - Denver CO
Michel L. Hearn - Broomfield CO
Richard M. Heidebrecht - Boulder CO
Kelvin K. Ho - Somerset NJ
Kenneth Y. Ho - Syosset NY
David M. Kissel - Boulder CO
Paul E. Miller - Northglenn CO
Richard D. Miller - Northglenn CO
Alan S. Mulberg - Boulder CO
LaJeana N. Roberts - Bedminster NJ
Michael A. Smith - Westminster CO
Kenneth F. Smolik - Naperville IL
Douglas A. Spencer - Boulder CO
Kenneth W. Strom - Naperville IL
John S. Thompson - Boulder CO
Richard A. Windhausen - Westminster CO

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

H04J 302

US Classification:

370 941

Abstract:

A wireless-access communications system, such as a CDMA cellular radio-telephone system (FIG. 2), comprises a packet-switched communications network (202, 207, 201) that interconnects cells (base stations; 202) with each other and with the public telephone network (100). Traffic of individual calls is packetized, and packet-bearing frames (300 in FIG. 7) of a plurality of calls are then statistically multiplexed and frame-relayed through the network to yield the high capacity, efficiency, and speed of traffic transport and handoff required for a CDMA cellular system. At each call processing unit (264 in FIG. 5), individual calls are handled by individual service circuits (602 and 612) which perform speech-processing functions such as coding and decoding, tone insertion, and echo cancellation, and packet-to-circuit-switched-PCM traffic conversion. Processors (602) adapt call processing unit timing to compensate for asynchrony between cells and call processing units and variations in call path transmission delays. Cell-to-cell communications, fixed call path addressing, and packetized control message transfers ensure that the same service circuit handles a call through even multiple soft handoffs (FIGS.

US Patent:

55219039, May 28, 1996

Filed:

Dec 27, 1993

Appl. No.:

8/173903

Inventors:

Michael J. English - Aurora CO
Michel L. Hearn - Broomfield CO
David M. Kissel - Boulder CO
Douglas A. Spencer - Boulder CO
Jeffrey A. Williams - Thornton CO
Jerome J. Zelenski - Broomfield CO

Assignee:

AT&T Corp. - Murray Hill NJ

International Classification:

H04M 322

US Classification:

370 14

Abstract:

A port system interfaces digital PBX's to any transmission facility having DSX-1 communications ports via a microprocessor controlled PBX port board connected between PBX switch fabric and a first DSX-1 communications port. A channel service unit (CSU) module coupled directly to the port board for communications with DS1 transmission lines defines a second DSX-1 communications port which is coupled to the first DSX-1 communications port. The CSU module also includes a T1 transceiver and line interface circuitry for coupling the CSU module to a DS1 transmission line. The combination of the port board and CSU module provide full functionality of conventional CSU's while the port board alone permits direct coupling of transmission facilities utilizing a DSX-1 communications port. For remote maintenance, a microprocessor of the port board is coupled to a control processor of a PBX for control of the port board microprocessor via the PBX control processor. Wiring test circuitry is provided in the CSU module to detect faults in the wiring between a CSU module and a DS1 transmission line.

US Patent:

53053087, Apr 19, 1994

Filed:

Oct 29, 1992

Appl. No.:

7/968559

Inventors:

Michael J. English - Aurora CO
Charles Y. Farwell - Denver CO
Michael L. Hearn - Broomfield CO
Richard M. Heidebrecht - Boulder CO
David M. Kissel - Boulder CO
Paul E. Miller - Northglenn CO
Richard D. Miller - Northglenn CO
Alan S. Mulberg - Boulder CO
Michael A. Smith - Westminster CO
Douglas A. Spencer - Boulder CO
John S. Thompson - Boulder CO
Richard A. Windhausen - Westminster CO

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

H04Q 702

US Classification:

370 321

Abstract:

A wireless-access communications system, such as a CDMA cellular radio-telephone system (FIG. 2), comprises a packet-switched communications network (202, 207, 201) that interconnects cells (base stations; 202) with each other and with the public telephone network (100). Traffic of individual calls is packetized, and packet-bearing frames (300 in FIG. 7) of a plurality of calls are then statistically multiplexed and frame-relayed through the network to yield the high capacity, efficiency, and speed of traffic transport and handoff required for a CDMA cellular system. At each call processing unit (264 in FIG. 5), individual calls are handled by individual service circuits (602 & 612) which perform speech-processing functions such as coding and decoding, tone insertion, and echo cancellation, and packet-to-circuit-switched-PCM traffic conversion. Processors (602) adapt call processing unit timing to compensate for asynchrony between cells and call processing units and variations in call path transmission delays. Cell-to-cell communications, fixed call path addressing, and packetized control message transfers ensure that the same service circuit handles a call through even multiple soft handoffs (FIGS.