Matches 551 - 600 out of 701 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >
Match Document Document Title
5608725 Method and apparatus of a communications system having a DMT infrastructure  
A communication system (100) includes a primary site (102) coupled to a plurality of secondary sites (104-108) using DMT technology. The primary site (102) includes a controller, a data...
5553126 Secure anti-jamming wireless party line  
A secure wireless party line system that can be used by a group of mobile users to communicate with each other like a wired party line but without the cumbersome inconvenience of long wired tether....
5539529 Facsimile communication with selective call receivers  
A selective call receiver (40) includes a receiver (66) for receiving information represented as a bitmap image. The selective call receiver 40 further includes a segmenter (206), coupled to the...
5528665 Telephone exchange apparatus for both mobile and stationary stations, in which all communication channel pairs are assignable for all stations  
A telephone exchange apparatus for both mobile and stationary subscribers in which the stationary subscribers are not assigned permanent channel pairs but rather are treated as the mobile...
5528593 Method and apparatus for controlling power in a variable rate communication system  
A method and apparatus for controlling transmission power in a variable rate communication system is disclosed. The method disclosed provides for a closed loop power control method. A first remote...
5528585 Modularly clustered radiotelephone system  
A power-conserving time division multiple access (TDMA) radio telephone system is disclosed in which a cluster of subscriber stations, remote from a base station, employs a common pool of...
5517492 Increased speech interleave with reduced delay  
In a TDM readiotelephone network, there is provided a mechanism for introducing link asymmetry between an uplink and a downlink, paired frame alternation on the uplink and downlink and bandwidth...
5515397 PCM subcode communications technique between a regional radio transmitter/receiver and a regional switching center  
In a radiotelephone network, processing steps previously applied to digital voice transmissions received by a regional radio transmitter/receiver but not applied to analog voice transmissions...
5513247 Method and apparatus for facilitating the making of wireless telephone calls  
The lack of uniformity for accessing wireless carriers to reach roaming wireless telephones prevents nationwide wireless telephone service from being provided in a seamless manner by an automated...
5513242 Method and apparatus for facilitating the ultimate making of wireless data transfers  
Unnecessary expenses associated with exchanging data with wireless data stations that have become unavailable are avoided, in accordance with the principles of the invention, by a) transmitting the...
5497424 Spread spectrum wireless telephone system  
A system for accessing a telephone system, in which a set of user stations are matched with a set of base stations for connection to a telephone network. Each base station may be coupled directly...
5493693 Mobile radio communication system utilizing mode designation  
A mobile radio communication system is provided with a base station apparatus connected to a wire circuit, a mobile radio station apparatus which is connected to the base station apparatus by means...
5479400 Transceiver sharing between access and backhaul in a wireless digital communication system  
A microcellular digital packet communication system is provided for digital communication having a plurality of repeating packet-mode fixed-site transceivers each being at a plurality of different...
5475869 Radio base station capable of distinguishing between interference due to collisions of outgoing call signals and an external interference noise  
In a mobile communication system having a radio base station (14A), a plurality of mobile stations connected to the radio base station via at least one control channel, and a radio exchange station...
5475735 Method of providing wireless local loop operation with local mobility for a subscribed unit  
Mobility is provided for wireless local loop radiotelephone systems by providing the home access network of a subscriber unit with a home access number. Upon registration of the subscriber unit...
5444763 Translation and connection device for radio frequency point of sale transaction systems  
A device is provided that interfaces with existing point of sale credit card reading devices, and furnishes the option of transmitting data over either the existing modem installation or a radio...
5442683 Directory structure for large scale telecommunications network allowing location of roaming mobile subscribers  
A mobile telecommunications system for a large area telecommunications system, including a plurality of different networks, has a directory/network structure for minimizing data storage and...
5400020 Advance notification system and method  
An advance notification system (10) and method for notifying school children of the impending arrival of their school bus (19). The system includes an on-board vehicle control unit (12) for each...
5396541 Call handoff in a wireless telephone system  
Signaling a mobile unit to transmit a synchronization pattern with voice information upon detecting from the signal strength of the wireless mobile unit by a base station that the mobile unit is...
5377255 RF repeaters for time division duplex cordless telephone systems  
An RF repeater for interfacing with a base station for exchanging transmit and receive signals in a time division duplex cordless telephone system comprises a multicarrier amplifier having an input...
5375122 Telephony device for a telephony communications network with fixed stations and independent stations  
A fixed station (BFR1) is able to interact with a plurality of independent stations (SA1, . . . , SA4) and is linked to an external management unit (UGRB1) only by the intermediary of a single pair...
5363376 Method and apparatus for synchronizing timing among radio ports in wireless communications systems  
In a TDM/TDMA digital radio communications system, time synchronization between fixed ports is achieved by adjusting the timing of a first port in response to the average timing difference between...
5363375 Method and apparatus for synchronizing timing among radio ports in wireless communications systems using hierarchical scheme  
In a TDM/TDMA digital radio communications system a few selected ports are connected to a fixed common timing reference and designated as master ports. Each master port is assigned a hierarchical...
5361302 Method for encryption sync compression in an encrypted radio telephone interconnect system  
A method for transparently coupling an encrypted two-way RF communication unit (100) with an encrypted landline communication unit (104). An RF message comprised of a plurality of data frames...
5337344 Telecommunication system and a method for matching the numbering schemes of two telecommunication systems  
The invention relates to a telecommunication system and a method for matching the numbering schemes of telecommunication systems. The telecommunication system comprises a transmission network...
5327574 Mobile communication system  
A mobile communication system comprises a switching station, base stations to constitute respective zones, and mobile stations moving in a service zone formed by the communication zones. Plural...
5280521 Portable telephone system  
A portable telephone system is disclosed in which a plurality of i-th class exchanges, which accommodate key service units of a plurality of portable telephone sets present in each service area,...
5103474 Drive-by personnel monitoring system with radio link  
A personnel monitoring system for monitoring presence or absence of particular individuals at preassigned monitoring locations. A local unit is provided at each monitoring location for detecting...
4993061 Portable miniature high fidelity stereo tape player and cordless radio telephone system  
A portable high fidelity tape player and cordless radio telephone system includes a base unit, a handset unit and a stereo unit, in which the stereo unit includes a carrier filter, a carrier...
4977589 Signalling and control protocol for a communication system  
A signalling and control protocol is provided wherein each subscriber unit (106) operating within a communication system (100) must transmit a request (200, 200' or 200") to communicate to a...
4816826 Digital telephone switching system having a message switch with address translation  
The invention provides a communications system comprising a plurality of functional units including a switching network and peripheral units, and a message switch comprising a processor and data...
4796291 Mobile radio communications system  
A mobile radio communications system for wide area mobile radio communications allows any two remote mobile stations to hold communications by way of a public switching network. A fixed station...
4785450 Apparatus and method for obtaining frequency agility in digital communication systems  
In a communication system that comprises a plurality of subscriber stations in RF communication with a base station having multiple sequentially repetitive time slots, each time slot being assigned...
4737977 Device and method for switching communications among taxis  
A user connected by telephone to a central telephone exchange can inform an automatic switching communications device directly of his own telephone number by dialing on his telephone set, which...
4726052 Radio telephone system and method for controlling same  
In a radio telephone system comprising a radio telephone set utilizing a rechargeable battery, and a base unit connected to the radio telepone set through a radio channel for exchanging a speech...
4682350 Equipment for wireless telephone transmission  
A method of connecting audio information between a base telephone unit which is stationary and a portable unit associated therewith, the method involving dividing the communication time for audio...
4677656 Telephone-radio interconnect system  
A telephone interconnect system for a two-way radio communications system is disclosed. A telephone patch interconnect unit accepts dialed digits from a telephone line, encodes them into a data...
4675863 Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels  
A system for the wireless transmission of multiple information signals utilizing digital time division circuits between a base station and a plurality of subscriber stations. The subscriber...
4635285 Communication system with voice priority for remote stations  
A two-way radio communications system of the simplex or half-duplex type having a communication link to a duplex telephone system is provided wherein the simplex or half duplex mobile radio is...
4528656 Radio communication system using frequency division multiplexing for transmission between a master station and a plurality of remote stations  
A point-to-multipoint radio communication system includes a master station and a plurality of remote stations which communicate with the master station using frequency division multiplexing. Each...
4517561 Selective call, paging and priority signalling system  
A selective calling, paging and priority signalling system for two way communications between at least one primary and a plurality of remote stations. An automatic selective calling mode is...
4434504 Channeling and decode circuit for airborne radio-telephone systems  
An airborne radio-telephone transceiver is provided having improved channeling and decode circuitry compatible with the selective signalling call-up system prescribed by the Federal Communications...
4320265 Line repeater for telephone system using radio links  
A telephone exchange communicates with a number of scattered local stations via radio links extending from a central terminal to respective peripheral installations each comprising a radio...
4310722 Mobile radiotelephone station two-way ranging system  
Some cellular mobile radiotelephone systems use tones for certain call connection supervisory functions on radio links. The presence of the correct tone in a received radio channel call signal is...
4280020 Radio telephone system with direct digital carrier modulation for data transmission  
In a method of transmitting data and speech signals over a telephone system through which communication is effected via a radio link, the data and the speech signals are separated in the frequency...
4268722 Radiotelephone communications system  
A telephone system for providing communications between mobile radiotelephones, portable radiotelephones and landline telephones includes a land-line telephone system including a land-line...
4257119 PCM switching system for wide and narrow band signals  
A common control telecommunications switching system capable of efficiently handling both narrow band and wide band information. The system uses a hybrid digital network having a time division...
4130731 Portable telephone system  
A portable telephone system which utilizes both a VOX and a duplexer network wherein the necessity for the transmission of a continuous signal and continuous receiver scanning is eliminated,...
4125808 Automatic sequential search for a radio relay network  
This invention involves the implementation of a mobile, automatic range extension network for a communication system, such as may be used by a field army. Range extension techniques related to this...
4071711 Telephone subscriber distribution system  
This invention relates to a multi-point information distribution system useful for telephone service, data connecting systems and other applications which permits a central station to service a...
Matches 551 - 600 out of 701 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >