Douglas A Spencer
Electrician at Willow Gln Ct, Boulder, CO

2003008, May 8, 2003

Oct 23, 2001

10/037590

Norman Chan - Louisville CO, US
Sharmistha Das - Broomfield CO, US
Douglas Spencer - Boulder CO, US
Danny Wages - Boulder CO, US

G10L021/00

704/213000

Classifying a call to a called destination endpoint by a call classifier. The call classifier is responsive to information received from the called destination endpoint to perform the call classification.

6674853, Jan 6, 2004

Nov 22, 2000

09/718909

Joel Ezell - Broomfield CO
John S. Helton - Ascot, GB
Norman W. Petty - Boulder CO
Douglas A. Spencer - Boulder CO
Wayne A. Zakowski - Boulder CO

Avaya Technology Corp. - Basking Ridge NJ

H04M 300

379242, 37921102, 370401

allowing a central business communication system to handle all aspects of call setup on a remote switch. Call control for a telecommunication call set up on a remote switch continues to be handled by the central business communication system; however, the switching of the bearer channels is performed automatically on the remote switch if the telecommunication call is between telecommunication terminals on the remote switch. In addition, if the telecommunication call is between two remote switches, the remote switches will automatically communicate the bearer channels through an interconnecting media without going through the central business communication system. In addition, when an Internet protocol (IP) such as IETF RFC 791 is utilized to communicate the bearer channels between the central business communication system and the remote switch, multi-frequency dialing tones received from analog telephones connected to the remote switching network are converted to digital information before transmission via the IP communication channels to the central business telecommunication system.

5184347, Feb 2, 1993

Jul 9, 1991

7/727491

Charles Y. Farwell - Denver CO
Michel L. Hearn - Broomfield CO
Richard M. Heidebrecht - Boulder CO
Kelvin K. Ho - Somerset NJ
Douglas A. Spencer - Boulder CO

AT&T Bell Laboratories - Murray Hill NJ

H04L 700

370 941

A CDMA cellular radio-telephone system (FIG. 2) has switching systems (201) synchronized to public telephone network (100) timing signals (600), and radio telephones (203) and cell base stations (202) synchronized to different clock (1000). Transmission delays between the cell base stations and the telephone network are variable. Switching systems include digital communications interfaces (264) to the telephone system, whose connections to the telephone system are synchronized to the telephone system, and whose connections to the cells are nominally also synchronized to the telephone system but whose processor (602) operates for each call within predefined windows (1302, 1402) of phase relationships to the operation of the cell that is handling the call, and occasionally adjusts (FIGS. 13-16) its phase relationships to the operation of the telephone system to achieve and maintain its operation within the predefined windows. Packet-switched communications (350) between the cells and the switching systems absorb the phase relationship fluctuations and the timing adjustments in inter-packet intervals.

5982783, Nov 9, 1999

Jun 16, 1997

8/876458

Ernest J. Frey - Westminster CO
Norman W. Petty - Boulder CO
Douglas A. Spencer - Boulder CO

Lucent Technologies Inc. - Murray Hill NJ

H04J 316, H04J 322

370467

Port networks (PN 101-103) of a switching system such as a distributed PBX are remoted from and interconnected with each other by an ATM network (100). Each port network includes a port network connectivity (PNC) circuit (113-114) that interfaces it to the ATM network. Only one of the port networks (101) has a system processing element (SPE 111), which controls all of the port networks. Commands issued by the SPE and needed by the ATM network to establish virtual circuits between the port networks are translated (FIG. 2) by a PNC circuit (113) into ATM signaling cells. Commands issued by the SPE and not needed by the ATM network are encapsulated (FIGS. 2 and 3) as payload into ATM traffic cells by the PNC circuit and are sent to destination processor networks through the virtual circuits. At a destination processor network, the encapsulated commands are retrieved (FIGS. 2 and 3) and used for local control.

5195091, Mar 16, 1993

Jul 9, 1991

7/727492

Charles Y. Farwell - Denver CO
Michel L. Hearn - Broomfield CO
Richard M. Heidebrecht - Boulder CO
Kelvin K. Ho - Somerset NJ
Douglas A. Spencer - Boulder CO

AT&T Bell Laboratories - Murray Hill NJ

H04L 700

370 941

A CDMA cellular radio-telephone system (FIG. 2) has switching systems (201) synchronized to public telephone network (100) timing signals (600), and radio telephones (203) and cell base stations (202) synchronized to a different clock (1000). Transmission delays between the cell base stations and the telephone network are variable. Switching systems include digital communications interfaces (264) to the telephone system, whose connections to the telephone system are synchronized to the telephone system, and whose connections to the cells are nominally also synchronized to the telephone system but whose processor (602) operates for each call within predefined windows (1302, 1402) of phase relationships to the operation of the cell that is handling the call, and occasionally adjusts (FIGS. 13-16) its phase relationships to the operation of the telephone system to achieve and maintain its operation within the predefined windows. Packet-switched communications (350) between the cells and the switching systems absorb the phase relationship fluctuations and the timing adjustments in inter-packet intervals.

5862131, Jan 19, 1999

Oct 10, 1996

8/728814

Norman W. Petty - Boulder CO
Michael A. Smith - Broomfield CO
Douglas A. Spencer - Boulder CO

Lucent Technologies Inc. - Murray Hill NJ

H04J 316, H04Q 1104

370362

A port circuit (108) for a time-division multiplexed (TDM) switching system (100) is designed to effect sub-time-slot operation without external support, as well as to effect conventional, time-slot operation. A clock-frequency multiplier, such as a frequency-multiplexed phase-lock loop (PLL 202), and a multiplier-driven sub-time-slot operation circuit, such as a PLL-driven finite state machine (203), are incorporated into the port circuit. The clock-frequency multiplier and the sub-time-slot operation circuit generate all the additional control signals that are necessary to define sub-time slots and to effect multiple information transfers in a single time slot. The port circuit engages in conventional time-slot transfers with conventional port circuits, whereby it is compatible therewith, and engages in sub-time-slot transfers with other sub-time-slot enabled port circuits, whereby it increases the transfer throughput of the TDM switching fabric. The sub-time-slot operation is selectively enabled and disabled on a per-time-slot basis.

7180869, Feb 20, 2007

Aug 30, 2001

09/943283

Douglas A. Spencer - Boulder CO, US

Avaya Technology Corp. - Basking Ridge NJ

G08C 15/00, H04M 9/08

370252, 37940601

Providing a systematic and comprehensive mechanism for applying echo cancellation within a telecommunication switching system by a local switching system such as a PBX. Echo cancellation circuits are deployed throughout the telecommunication switching system using different types of echo cancellation circuits with each type having different capabilities with respect to a time offset of an echo return signal relative to when an voice signal was generated by a talker. The echo cancellation circuits deployed within the local telecommunication switch are an integral part of trunk circuits and provide the largest time offset. Further, the echo cancellation circuits deployed within in the local telecommunication switch are capable of controlling echoes in either direction with respect to the integral trunk circuit and may be used as service circuits if not needed by the integral trunk circuit. A systematic and comprehensive mechanism further comprises terminating echoes at the edges of networks having long transmission delays such as a wide area network (WAN) comprising a combination of ATM and/or IP switching networks. The mechanism enables uniformity in policing echoes at the “near end” at the appropriate points in the PBX network or in a network of PBX's.

5521903, May 28, 1996

Dec 27, 1993

8/173903

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

AT&T Corp. - Murray Hill NJ

H04M 322

370 14

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.

4398287, Aug 9, 1983

Sep 1, 1981

6/298381

Douglas A. Spencer - Boulder CO

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

H04J 302, H04Q 1104

370 85

In a PAM bus switching bus which normally handles analog voice signals, the different DC offsets caused by the different buffing, summing and distribution amplifiers cause no ill effects because DC voltages are not passed by the remainder of the support elements. However, when it is attempted to switch logic level DC signals through such a PAM bus network, the DC offset which is an indeterminate function of the particular switching path established, makes it impossible to establish a uniform slicing level. In the illustrative embodiment a uniform slicing level is achieved by clamping the summing bus of the PAM system during a preamble of the time slot, measuring the offset on the distribution bus and then applying the measured offset to compensate the distribution bus during the remainder of the time slot when the actual data signal is allowed to be applied to the summing bus.

2003008, May 1, 2003

Oct 23, 2001

10/037583

Norman Chan - Louisville CO, US
Douglas Spencer - Boulder CO, US

H04M003/00, H04M005/00

379/243000, 379/088010

Classifying a call to a called destination endpoint by a call classifier. The call classifier is responsive to information received from the called destination endpoint to perform the call classification.