1
Ching Y Kung: Expert system for communications network. Racal Data Communications, William A Newton, October 27, 1992: US05159685 (174 worldwide citation)

An Expert System 10 for providing diagnostics to a data communications network 5. Alarms from a Network Manager 24 are received and queued by an Event Manager 117 and then filtered by an Alarm Filter 118 to remove redundant alarms. Alarms which are ready for processing are then posted to a queue ref ...


2
Arthur H Rosbury, Judson T Gilbert, Donald C O Connor, Grant A Newland: Modem diagnostic and control system. Racal Data Communications, Jackson Jones & Price, May 24, 1983: US04385384 (174 worldwide citation)

A system for diagnosing and controlling operation of a plurality of modems, some located at a central site and others at various remote sites. A processor located at the central site selectively addresses microprocessor test and control units at each modem over a secondary channel. The microprocesso ...


3
Milan J Vrenjak: Network management system with event rule handling. Racal Data Communications, Jerry A Miller, November 5, 1991: US05063523 (170 worldwide citation)

A data communication network management system allows a user to establish rules which are pattern matched to attributes of incoming events, such as alarms, from network objects. When a match is found, the network management system retrieves a user prepared command SCRIPT file and substitutes attribu ...


4
Luis V Farias, Vadavalli G Krishnan, Chin Pan Wong: Constellation multiplexed inband secondary channel for voiceband modem. Racal Data Communications, Jerry A Miller, January 2, 1990: US04891806 (101 worldwide citation)

A method of providing an inband secondary channel for a data modem includes encoding the main channel data using a convolutional encoder so that main channel data symbols are selected from a first constellation. The secondary channel data are encoded using a differential encoder and secondary channe ...


5
Chun C Lu, William J Miller, Jack E Stephenson, Jay P Jayapalan: Digital voice transmission having improved echo suppression. Racal Data Communications, Jerry A Miller, William A Newton, March 24, 1987: US04652703 (80 worldwide citation)

A digital voice communication apparatus having improved echo suppression includes a transmission gain detection circuit for detecting a near talker signal and a receiver gain detection circuit for detecting a far talker signal. An echo detecting circuit detects which of the near talker and far talke ...


6
Ming Luh Kao: Modem with data compression selected constellation. Racal Data Communications, Jerry A Miller, June 26, 1990: US04937844 (79 worldwide citation)

A data modem includes a data compression circuit which compresses incoming data prior to transmission. The compression ratio obtained from the compression process is used to select a constellation for transmission of the data. When higher compression rates are achieved, fewer constellation points (s ...


7
Jerry A Miller: Adaptive echo canceller with sparse dynamically positioned taps. Racal Data Communications, Jerry A Miller, February 14, 1989: US04805215 (78 worldwide citation)

This invention relates to an echo canceller, for a transmission line, including a shift register having an input for receiving an input signal from a signal source and having a plurality of output taps for providing a plurality of equally spaced delayed signals. A tap coefficient storage memory stor ...


8
Ming Luh Kao: ISDN terminal adapter with teleconference provision. Racal Data Communications, Jerry A Miller, March 5, 1991: US04998243 (74 worldwide citation)

A device for providing teleconference capabilities in an ISDN includes a first receiver for receiving a first signal representing a first message over a first ISDN B-channel. A second receiver receives a second signal representing a second message over a second ISDN B-channel. A receive mixer mixes ...


9
Rogelio J Basnuevo, Jose R Diaz, Norman J Donaghue, Jorge A Valdes, Stephen J Winter: Multiport - multipoint digital data service. Racal Data Communications, Nixon & Vanderhye, January 5, 1993: US05177739 (73 worldwide citation)

In a Digital Data System (DDS) a method and apparatus for providing multipoint multiport service. Differences in time delays through the network are compensated by an alignment training wherein the delays from each remote station are measured at a Central station. The Central station determines how ...


10
Aldo A Martinez: Method and apparatus for equalization of data transmission system. Racal Data Communications, Jerry A Miller, January 10, 1989: US04797898 (72 worldwide citation)

A data communication system, comprising a first and a second transceiver coupled together through a transmission channel, the transmission channel having transmission characteristics. A measurement circuit is coupled to the first transceiver for measuring the effects of the transmission characterist ...