Abstract:
The present invention provides a method and apparatus for controlling power consumption and access to telephone channels (36) in a cable telephony system (10). The system (10) has two subsystems for limiting power and access, one, when a telephone (40) is waiting to receive a call and a second when a subscriber wants to place a call. The telephone (40) is usually waiting for a telephone call. The first subsystem reduces power consumption by having a transceiver (114) for the telephone (40) only monitor for incoming calls periodically and turns off the transceiver (114) when not monitoring for calls. The second subsystem, limits system power consumption and access to channels (36) by only allowing loop current and access to channels (36) when a channel (36) is available for use. These two subsystems reduce the system power consumption and regulate the access to the telephone channels (36).
Abstract:
A wireless communication system (Fig. 1) and station (60, 62 & 64) for use therein, having means for receiving a command packet (Fig. 2) comprising: an address field (bits 0-15) containing a station address; an operation code field (bits 24-28) containing a code at least partly specifying an operation to be performed by said addressed station; and an argument field (bits 16-23) containing an argument used to further and fully specify, together with the operation code in the same command packet, said operation when said operation code only partly specifies said operation and is capable of conveying data or status information when said operation fully specifies said operation, whereby said operation may be determined by said operation code in conjunction with said argument when said argument is used to further specify said operation, and means for performing said operation specified in said received command packet only when portions of said addressed station's address match corresponding portions indicated in the received address.
Abstract:
A data signalling system for transmitting signals between at least one primary station (50, 52) and a plurality of secondary stations (60, 62, 64). The system is well adapted for use in multiple unit radio communications systems capable of voice and data communications. A register model is utilized which permits a highly flexible signalling system compatible with a wide range of communications networks. Data transfer is accomplished using fixed length data packets (Fig. 2 and 3) which are error correction encoded and transmitted utilizing PSK modulation.
Abstract:
A control unit (102) efficiently decodes burst signal transmissions in a TDMA based telecommunication system (100) by decimating down the number of samples requiring processing during symbol detection. The control unit (102) includes a sampling receiver (304) that inputs burst signals from cable access units, converts them to a pair of baseband quadrature signals, I and Q. fThe sampling receiver (304) also includes an A/D converter (314) that samples the I and Q signals at preferably four times the symbol rate. A digital signal processor circuit (306) produces a timing error signal for substantially all of the samples. The digital processor circuit (306) also accumulates a timing error sum for each of the four samples. The processor circuit (306) selects the optimum sample between the samples having the largest positive and negative error sums. The processor circuit (306) also includes a * small Greek pi */4-DQPSK differential detector that processes the optimum sample of each symbol for symbol detection.
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.
Abstract:
In accordance with the present invention, there is provided a register-modelled radio system comprising a plurality of register-modelled processors having addressable registers for modelling the virtual state of the processor; a serial bus, interconnecting the register-modelled processors for communicating between the addressable registers; and a communications protocol for passing information to or from the addressable registers, whereby the virtual state of a radio portion may be determined or altered by, respectively, communicating information from or to the addressable registers. The communications protocol further comprises an information packet having an address, an operation code, optional data, and an error detection device, such as a cyclical redundancy check packet. The operation code is chosed from the group of primitive operation codes reset, read, write, bit set, bit clear, acknowledge, and negative acknowledge.
Abstract:
A general purpose data control and information system (30-64) particularly well adapted for multiple unit (60-64) radio communications providing reliable enhancement to normal voice systems. The system provides addressing capability (Fig. 2, bits 0-15), along with data transfer (Fig. 3) and utilizes handshake and retransmisssion protocol to enhance flexibility and reliability. The system utilizes fixed length signalling packets (Figs. 2 and 3) with error correction encoding, to permit data transfer, transmitter identification and control and status monitoring.