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    DATA COMMUNICATIONS SYSTEM
    3.
    发明专利
    DATA COMMUNICATIONS SYSTEM 未知

    公开(公告)号：AU7896487A

    公开(公告)日：1987-12-24

    申请号：AU7896487

    申请日：1987-09-25

    Applicant: MOTOROLA INC

    Inventor： KREBS JAY ,  FREEBURG THOMAS ARTHUR

    IPC: H04W28/06 ,  H04L1/00 ,  H04B7/26

    Abstract: A data communications system is described in which variable length messages are communicated between a general communications controller (GCC) and a plurality of portable and mobile radios. The variable length messages include a bit synchronization field, a message synchronization field and a plurality of channel data blocks for efficiently and reliably handling long strings of data or text. Each channel data block includes an information field, a parity field for error-connecting the information field and a channel state field indicating whether or not the radio channel is busy or free. The GCC is coupled to a cellular arrangement of channel communications modules (CCM's), which each include a radio transmitter and/or radio receiver. The mobile and portable radios communicate with the GCC by way of the CCM's.

    4.
    发明专利
    未知

    公开(公告)号：NO169415C

    公开(公告)日：1992-06-17

    申请号：NO841205

    申请日：1984-03-27

    Applicant: MOTOROLA INC

    Inventor： BURKE TIMOTHY MARK ,  FREEBURG THOMAS ARTHUR ,  KREBS JAY ROBERT ,  NOBLE SCOTT WILLIAM

    IPC: H04B7/26 ,  H04M7/04 ,  H04B1/10 ,  H04W88/02 ,  H04B1/00 ,  H04Q7/00

    Abstract: A data signalling system for transmitting signals between at least one primary station and a plurality of secondary stations. The system is well adapted for use in multiple unit radio communications systems capable of noise and data communications. A register model is utilized which permits a highly flexible signalling system compatable with a wide range of communications networks. Data transfer is accomplished using fixed length data packets which are error correction encoded and transmitted utilizing PSK modulation.

    6.
    发明专利
    未知

    公开(公告)号：NO841205L

    公开(公告)日：1984-03-27

    申请号：NO841205

    申请日：1984-03-27

    Applicant: MOTOROLA INC

    Inventor： BURKE TIMOTHY MARK ,  FREEBURG THOMAS ARTHUR ,  KREBS JAY ROBERT ,  NOBLE SCOTT WILLIAM

    IPC: H04B7/26 ,  H04M7/04 ,  H04B1/10 ,  H04W88/02 ,  H04B ,  H04Q

    Abstract: A data signalling system for transmitting signals between at least one primary station and a plurality of secondary stations. The system is well adapted for use in multiple unit radio communications systems capable of noise and data communications. A register model is utilized which permits a highly flexible signalling system compatable with a wide range of communications networks. Data transfer is accomplished using fixed length data packets which are error correction encoded and transmitted utilizing PSK modulation.

    RADIO TRANSMITTER TIME OUT TIMER
    8.
    发明专利
    RADIO TRANSMITTER TIME OUT TIMER 未知

    公开(公告)号：AU4457579A

    公开(公告)日：1979-09-06

    申请号：AU4457579

    申请日：1979-02-26

    Applicant: MOTOROLA INC

    Inventor： DOLIKIAN ARMAN VAHE ,  FREEBURG THOMAS ARTHUR

    IPC: H04B1/04 ,  H04B1/54 ,  H04B7/26 ,  H04B17/00

    Abstract: A mobile data terminal system is capable of voice or microprocessor controlled data transmission over a keyed transmitter. The improved timer apparatus disables further transmission if the transmission duration or the average duty cycle over a predetermined time period of repeated transmitter keying exceed predetermined limits. Where the disable mode resulted from a microprocessor fault, the transmitter continues to be disabled until the microprocessor is reset.

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