Pulse or digital communications – Repeaters – Testing
Patent
1986-03-17
1987-12-22
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 48, 375 91, 375104, 370 82, 329112, 332 22, H04B 1500, H04L 2710, H04J 316
Patent
active
047150459
ABSTRACT:
A system protocol for the composite shift key communication of binary signals in which a transmitting transceiver transmits a first summed signal having a first qualifying signal at a qualifying signal frequency Wqt as one of the summed signal components only when a binary signal is desired to be transmitted. The transmitting transceiver ceases transmission of the first qualifying signal Wqt as a transmitted signal or as a component of a composite summed signal when neither a binary zero nor a binary one is desired to be transmitted. The receiving transceiver signals to the transmitting transceiver when the binary signal transmission is being successfully received by transmitting thereto a second qualifying signal Wqr. The receiving transceiver drops the transmission of the second qualifying signal Wqr when the binary signal transmission is not being successfully received, or is being received with perceived errors therein. The transmitting transceiver expects to receive the second qualifying signal Wqr during a successful binary signal transmission, and maintains its transmission of binary signals only when Wqr is received, indicating a successful binary signal transmission, and drops and restarts its transmission of binary signals in response to the transmission of Wqr being dropped by the receiving transceiver, indicating an unsuccessful binary signal transmission.
Details are also disclosed of many additional aspects of a protocol communication system including transmission in data packets, timing of the length of data packets as indicated by a subfield therein, a complementary binary test, a CHECKSUM subfield, a SEQUENCE subfield, a CHANNEL subfield, a TARGET subfield, a SENDER subfield, a LINK/CALL subfield, a SWAP subfield, an ORIGINAL TRANSMITTER subfield, an adaptive data packet length function, and a function which utilizes error information stored in memory in the selection of an available best communication channel.
REFERENCES:
patent: 4197500 (1980-04-01), Klein et al.
patent: 4577333 (1986-03-01), Lewis et al.
Computer Networks by A. Tanenbaum, 1981, Prentice-Hall, pp. 133, 143-155, 162-165, 174-177.
Sippl, Data Communications Dictionary, 1976, Van Norstrand Reinhold Company, pp. 1 and 318.
Alpern Alan N.
Frank Andrew C.
Lewis Kenneth A.
Ross Stuart E.
GridComm Inc.
Griffin Robert L.
Telesz Jr. Andrew J.
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