Abstract: A signal structure for high speed data communication selects each signal point in the structure to attain a low probability of error in the presence of both additive noise and multiplicative noise. Transmission apparatus for practice of the invention employs an encoder which responds to digital data to produce a QAM signal having parameters selected according to the new signal structure, and receiving apparatus employs a decoder which converts a received QAM signal to digital values according to the same structure.
Type:
Grant
Filed:
November 22, 1983
Date of Patent:
April 21, 1987
Assignee:
Infinet, Inc.
Inventors:
Jerry L. Holsinger, Charamporn Jotikasthira, Kaveh Pahlavan
Abstract: A signal structure for high speed Trellis coded data communications selects each signal point in the structure to attain a low probability of error in the presence of both additive noise and multiplicative noise. Viterbi decoding is modified to take account of the multiplicative noise energy content of the received signal.
Abstract: A network control and test system for application to data communications networks. In a first mode of operation, the system learns the network configuration automatically and builds a table describing the network configuration. In a second mode of operation, the system automatically monitors the status of the network and each of its component units, periodically polling the network for changes of status and updating the information in the network configuration table to reflect such changes. In a third mode of operation, selective sites in the network may be tested under control of the system at previously selected and entered times of day, at which times previously chosen tests are performed without the need for operator intervention. In a fourth mode, an operator can manually command the system to perform certain tests and control functions.
Type:
Grant
Filed:
December 31, 1981
Date of Patent:
October 1, 1985
Assignee:
Infinet Inc.
Inventors:
David L. Lyon, Robert E. Huettner, Jerry L. Holsinger, Don I. Falkenstein, Imtiaz Piracha, Dennis T. Ching
Abstract: A network control and test system for application to data communications networks. In a first mode of operation, the system learns the network configuration automatically and builds a table describing the network configuration. In a second mode of operation, the system automatically monitors the status of the network and each of its component units, periodically polling the network for changes of status and updating the information in the network configuration table to reflect such changes. In a third mode of operation, selective sites in the network may be tested under control of the system at previously selected and entered times of day, at which times previously chosen tests are performed without the need for operator intervention. In a fourth mode, an operator can manually command the system to perform certain tests and control functions.
Type:
Grant
Filed:
December 10, 1980
Date of Patent:
October 1, 1985
Assignee:
Infinet Inc.
Inventors:
David L. Lyon, Robert E. Huettner, Jerry L. Holsinger, Don I. Falkenstein, Imtiaz Piracha, Dennis T. Ching