Abstract: A system includes a base unit, a plurality of connectors disposed in the base unit each operable to couple to a module, and each module operable to couple to at least one terminal unit. The system further includes a host processor residing in the base unit and coupled to a communications network, and a first high speed switch residing in the base unit having a plurality of ports coupled to the plurality of connectors and further coupled to the host processor.

Abstract: An apparatus (10) and method for selectively monitoring radar signals impinging on a vehicle is disclosed. The apparatus (10) comprises a speed determination circuit (20) that determines vehicle speed and provides a speed signal representative thereof to a comparator (22) that compares the speed signal to a preselected speed and provides an on signal when the vehicle speed exceeds the preselected speed and an off signal when the vehicle speed is at or below the preselected speed. When the comparator (22) provides the on signal, a radar detecting circuit (14) is powered to detect incoming radar signals and provide a radar detected signal to an alarm (18) that provides an alert in response to the radar detected signal. When the comparator (22) provides the off signal, the radar detecting circuit (14) is not powered and does not detect incoming radar signals.

Abstract: A power measurement circuit, suitable for use in communications devices, is provided in which first and second signals derived from the signal of interest are passed through a multiplier, and the output of the multiplier is passed through a filter. In one embodiment, the filter provides a signal substantially representative of or relating to the DC component of the signal output from the multiplier. In another embodiment, the filter provides a signal substantially representative of or relating to the average power of the signal of interest. Advantageously, in one embodiment, the signal output from the filter bears a substantially linear relationship to the average power of the signal of interest over a desired region of operation. In a second embodiment, the signal output from the filter is advantageously substantially frequency invariant over a desired region of operation.

Abstract: A radio communication network is disclosed, wherein direct calls are automatically converted to pages when the called radio is not in radio frequency (RF) communication with any of the cells of the radio system. The called radio's current checked-in cell sends call set up messages to the called radio. If the called radio does not respond, then the incoming call is automatically converted to a page that is delivered to the called radio when it checks back into the system. Any appropriate network element, such as the calling radio, the calling or called radio's checked-in cell, or the called radio's home cell, may configure the page.

Abstract: A communications device determines transmitted signal power by providing the transmitted signal to a signal strength indication (SSI) processor that detects voltage of the transmitted signal and determines signal power of the transmitted signal during normal operation by searching a calibration table of the SSI processor and correlating the detected transmitted signal voltage to stored signal power values. The calibration table is constructed by providing transmitted signals to the SSI processor during a calibration phase of operation, detecting the transmitted signal power, and storing the transmitted signal voltage level with the detected transmitted signal power, for a plurality of transmitted signals. Thus, the SSI processor combines the function of a conventional RSSI processor and also performs measurement of the transmitted signal power.

Abstract: A mobile communication device comprising a handset achieves gain control of a received signal by adjusting gain of the received signal based on A/D converter samples of the received signal, rather than on power I2 and Q2 calculations of the received signal. The device processes a received signal and adjusts its gain by first setting signal gain to a maximum level, then providing the amplified received signal to an analog-to-digital converter (ADC) that produces a predetermined number of ADC signal sample values in a single cycle of an estimated signal frequency of the received signal. Setting the signal gain to a maximum initial level will cause a number of ADC signal sample values to have full scale magnitude, indicating saturation of the ADC.

Abstract: A multi-site dispatch communication network includes a hub controller programmed to expedite the connection between multiple radio cells to accomplish a broadcast of the radio transmission. A routing table is employed to provide an association between the various group identification codes and the respective mobile radio cell sites servicing members of the group. A connection table is employed to identify the resources utilized in the dispatch communication connection. When a dispatch communication is initiated, the routing table is accessed to determine which mobile radio cell sites service the various members of the group. When a connection is made to establish the dispatch communication, the connection table is written with information concerning the resources utilized to complete the dispatch communication. In this manner, dispatch communications can be quickly established and terminated. The resources of the network are thereby optimized.

Abstract: Methods and apparatus for performing DC—DC converter synchronization in a mobile DC-powered device in which the variable clock output of a serial communications circuit is utilized to synchronize the clock which provides the switching function in the DC—DC converter.

Abstract: A power control circuit for use with a closed loop transmitter such as a cellular telephone. The inventive circuit includes an amplifier for varying the output power level of the transmitter output signal. The amplifier includes an input terminal and a gain control terminal. The transmitter output is fed back to the gain control terminal of the amplifier by a feedback loop. The feedback loop includes circuitry for adjusting the response thereof in response to a loop gain control signal. A control system is included for receiving a power level control signal over a predetermined range of transmitter output power levels and providing the loop gain control signal in response thereto whereby the feedback loop has a linear gain response over the predetermined range of output power levels. In the illustrative embodiment, the system is adapted for use in a mobile station of a cellular telephone system to which a power level control signal is supplied by a base station thereof.

Abstract: An integrated cellular and cordless communication system in which cellular calls are forwarded to a landline telephone number associated with a personal base station when a subscriber terminal is determined to be within a predefined vicinity of the personal base station is described herein. Once forwarded to the personal base station via external network elements, such calls may be answered using a cordless device operative to communicate with the personal base station. Alternately, the calls may be transferred to a voice messaging module within the personal base station. When the subscriber terminal is determined to have been removed from within the vicinity of the personal base station, a message from the personal base station to the external network elements results in modification of a call forwarding address such that subsequent calls intended for the subscriber terminal are in fact routed thereto.

Abstract: A mobile radio communication network including plural radio cells controlled by a centralized hub controller. The hub controller communicates data packets to each radio cell on a data line, and bridges together appropriate audio lines to provide dispatch communications between the radio cells. The hub controller is programmed to carry out tests on each data line and each audio line to verify off-hook conditions thereof so that uninterrupted data signals and audio signals can be carried.

Abstract: A radio communication system is disclosed, wherein caller identification information is sent to called radios prior to the initiation of voice communications. The called radio's current checked-in cell sends call set up messages to the called radio and receives a response from the called radio. The cell then sends page information comprising the calling, or source, radio's identification. Voice communications are established immediately following the page data transmission. The called user is notified of the page information and can access the page message to determine which radio initiated the incoming call.

Abstract: A method for facilitating the placement of emergency calls from a wireless telephone within a cellular, or other wireless, communication system is disclosed herein. A wireless telephone is configured to receive from a base station a local emergency number associated with the service area of the base station. During operation of the wireless telephone, each number dialed or otherwise entered in by a user is compared to the local emergency number. If the dialed number matches the local emergency number, an emergency call is initiated by the wireless telephone; otherwise, the wireless telephone initiates a standard telephone call in response to entry of the dialed number. The user interface of the wireless telephone may optionally provide an indication upon the placement of an emergency call.

Abstract: A method and device for error-correcting a plurality of bits transmitted over RF channels in a cellular communication system are provided. The present invention applies principles of majority voting to error-correct a plurality of bits in a message word simultaneously. Further, the present invention applies its error-correction capability to virtually any number of repeat transmissions over forward and reverse control/voice channels. Following synchronization of the transmit and receive stations, a message word having n-bits is transmitted repeatedly. The repeat bits are separated and analyzed whereafter the true logical state of the original n-bits is determined. The originally transmitted message word is then reconstructed based upon the determined true logical state of the n-bits.

Abstract: A system for networking dispatch-type of communications. A plurality of radio cells are coupled to a centralized hub controller via the public switched telephone network. The radio cells are networked together via the hub controller using one or more telephone voice lines and a respective data line for providing communications between each radio cell and the hub controller. Data packets are transferred between the radio cells and the hub controller on the data lines to set up a path for the dispatch communications on the telephone voice lines. The hub controller carries out a trunking function of the telephone voice lines so that the number of voice lines are minimized, while yet preventing blocking of dispatch communications.

Abstract: The pager has flexible sequencing of messages to the display. The sequencing of messages on the display is done either manually by switch actuation, automatically by a timed delay sequencing method, or by a combination of both. The method of message sequencing and the illumination of the display is controlled solely by the pager user and may be controlled by a single switch.

Abstract: A land mobile radio communication system has a plurality of cell cites, each of which includes a plurality of repeaters. The mobil radios in the cell transmit and receive both data and audio. The date component of the signal is carred as low-frequency subaudible information. In operation the system determines the number of repeaters that are available. When the system has determined that more than a predetermined number of the repeaters are available, all of the repeaters are set to repeat audio and to transmit and to receive data. However, when the system determines that only the predetermined number of repeaters are available, all of the repeaters, except for the ones of the repeaters in the predetermined number, are set to repeat audio and to transmit and receive data. The ones of the repeaters in the predetermined number are set to only transmit and receive data.