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6052377 Access control method in communication system  
A down-link frame generating/transferring portion 12 detects a free channel from among a plurality of previously assigned up-link channels. The down-link frame generating/transferring portion 12...
6031837 Method for forming multiple bidirectional connections for use in asynchronous transfer mode switching device  
A method for establishing bidirectional connections and multiple connections performed by an ATM switching device is disclosed, and the method may include the steps of recognizing a connection...
6011799 Method and apparatus for managing external physical layer devices  
Every external physical layer device coupled to a multiport data communication switch is polled in succession to determine status and control information relating to the external physical layer...
6006017 System for determining the frequency of repetitions of polling active stations relative to the polling of inactive stations  
An apparatus and method to implement a hybrid contention and polling protocol for a communications or computer network is disclosed. Various apparatus and method embodiments of the invention...
5973609 Communication system with adaptive media access control  
A communication system includes data terminals and controllers. The controllers have distinct areas of responsibility in which they communicate with particular data terminals. The controllers map...
5970063 Method for unacknowledged data frame delivery in a noisy wireless environment  
Fading on a data link prevents a mobile station from acknowledging a received base station poll message. Responsive thereto, the data link is transitioned to an unacknowledged mode of operation. A...
5960000 System, device, and method for contention-based reservation in a shared medium network  
A system, device, and method for contention-based reservation in a shared medium network resolves collisions resulting from contention access using a combination of probabilistic tree splitting...
5959997 Hybrid access system with AGC control of upstream channel transmit power  
A hybrid access system and method using a hybrid access system point of presence router and a remote link adapter to connect a user computer terminal to a network for fast downstream information...
5949822 Encoding/decoding scheme for communication of low latency data for the subcarrier traffic information channel  
A communication system for communicating low latency data in a fading channel environment using a data structure having data frames modulated on a subcarrier signal and on a commercial radio...
5939999 Polling method and apparatus for a digital processing system  
A polling method and apparatus for polling from a control unit to a plurality of controlled units using an information collecting command in order to collect status information from each...
5930260 ISDN terminal adapter using digital signal processor  
A terminal adapter for ISDN services is implemented using a digital signal processor rather that a general purpose microprocessor, and provides normal terminal adapter functionally while at the...
5926476 Network architecture for broadband data communication over a shared medium  
Network architectures and data communication protocols for supporting both downstream and upstream transport of digital data between a headend facility and multiple downstream network terminals...
5926478 Data transmission over a point-to-multipoint optical network  
A data transmission protocol for use in an ATM-based point-to-multipoint passive optical network having a headend facility and a plurality of downstream network units, wherein downstream data is...
5923661 Method of collecting large amounts of data in apparatus such as ATM exchange  
A central control unit responsible for path control collects data from a distribution/concentration unit by issuing thereto a command containing the specification of multiple data items. The...
5917813 Multiple access telecommunication network  
A multiple access telecommunication network wherein a primary station is coupled to a plurality of secondary stations by a shared transmission medium. Depending on traffic volume it is...
5907559 Communications system having a tree structure  
A communications system is organized into a two or more levels of multiplexing modules. Each multiplexing module has a plurality of inputs from next level multiplexing modules, with the exception...
5896561 Communication network having a dormant polling protocol  
A base station utilizing a dormant polling protocol transmits polling sequences to a plurality of remote transceivers during periods of heavy loading. During periods of light loading, the base...
5896382 Method and apparatus for communicating information between a headend and subscriber over a wide area network  
A distribution system architecture provides a platform for communicating energy services and non-traditional services as part of an overall communications infrastructure. A native message,...
5872522 Selective call system  
A selective call system including a system controller, a base station transceiver and a plurality of secondary stations with receivers and low powered transmitters capable of sending spread...
5859852 Hybrid access system with automated client-side configuration  
An asymmetric network communication system for use in a client-server environment having independent forward and return channels operating at different speeds and/or under different protocols on...
5854591 System and method for processing passenger service system information  
Implemented on a vehicle, a digital in-transit entertainment system that assists in providing passenger services to a plurality of end nodes of a vehicle. The system includes a multi-drop digital...
5841770 Data communication system using indentification protocol  
One or more interrogating commander stations and an unknown plurality of responding responder stations coordinate use of a common communication medium. Each commander station and each responder...
5818845 Hybrid access system having channel allocation and prioritized polling schemes  
An asymmetric network communication system for use in a client-server environment having independent forward and return channels operating at different speeds and/or under different protocols on...
5787132 Data communication system having improved synchronization capability  
A data receiving unit includes a data receiving circuit for receiving, through a transmission path, transmission data which has been encoded into a predetermined transmission code by using a...
5781726 Management of polling traffic in connection oriented protocol sessions  
Traffic involved in maintaining a set of connection oriented sessions between end stations in a network is managed to optimize and reduce the polling traffic needed to maintain the connection...
5768280 Two-way broadband CATV communication network protocol and monitoring technology  
A medium-access protocol is disclosed for use in a communication network to provide a two-way broadband communication network. The communication network comprises a central network controller...
5757276 Communication port control system  
A communication port control system which controls the use of communication ports for making a communication between a main station and a plurality of sub stations, and includes a processing unit...
5745769 Multiple connection method using a single control link  
A multiple connection method using a single channel is provided. The multiple connection method includes the steps of: (a) transmitting polling addresses from the master in a predetermined...
5737330 System and method for the efficient control of a radio communications network  
A technique for optimizing throughput on a communications channel shared by multiple users. A communications channel that must be shared by a large number of devices has the potential of being...
5734642 Method and apparatus for network synchronization  
According to several aspects of the present invention, a network is monitored for status information indicative of the status of a manageable device within the network. A network manager receives...
5732129 Method of improving computer communication speed in key telephone system  
A method of improving the speed of a computer communication interface module in a key telephone system is disclosed including the steps of: (a) detecting if control data transmission/reception...
5729546 Expandable communication cell bus for multiplexing and concentrating communication cell traffic onto high speed lines  
A communication interface with an expandable multilane cell bus that enables conversion of communication traffic received over a set of low speed or narrow band communication links according to a...
5725383 Data transmission system  
In a karaoke system, a central terminal and a plurality of karaoke terminals are connected by a coaxial cable. A polling modem modulates a polling signal to a predetermined channel signal and...
5721737 Serial transmission system for controlling a network of I/O devices  
A serial transmission system for controlling a network of input/output devices is provided. The serial transmission system includes: a three wire serial link; a master unit for controlling...
5696765 Configurable hybrid medium access control for cable metropolitan area networks  
The hybrid medium access control MAC system is configurable to the type of communication required to support a desired application or service. The MAC system analyzes services requested from a...
5694543 Polling substitution system for performing polling communications within a computer network  
A substitution response section processes a start, stop, restart, and end of a substitution response to a polling request from a server unit on the basis of an exchange of a sync control message...
5687175 Adaptive time-division multiplexing communications protocol method and system  
A system and method for an adaptive time-division multiplexing communications protocol for collecting data from remote sensors equipped with RF transceivers using an RF transceiver equipped mobile...
5684802 System and method for hybrid contention/polling protocol collison resolution used backoff timers with polling  
The system and method provide for efficiently resolving collisions in an environment where a transmitting device cannot hear collisions without a headend control station/control device, i.e.,...
5684843 Data transmission system for transmitting information from a central control unit to a plurality of terminals  
A data transmission system includes a polling modem and a central control unit that receives a response signal from a terminal. A data transmission central control unit performs polling type...
5682604 Communications system with priority scheme for reduced access delay  
A communications system is described having a central station and a number of remote units arranged for communication over a common communications channel. Each remote unit has a predetermined...
5673252 Communications protocol for remote data generating stations  
A method for communicating data between a central data terminal, a plurality of intermediate data terminals, a plurality of remote cell nodes, and a plurality of network service modules, using a...
5604748 Information processing apparatus for transmitting information among a plurality of nodes and arbitration method in such information processing apparatus  
An information processing apparatus transmits data among a plurality of nodes connected to a common transmission line. An arbiter selectively gives use permission, to use the common transmission...
5596577 Method and system for providing access by secondary stations to a shared transmission medium  
A method for providing access by secondary stations (12, 14, 16) to a shared transmission medium, maintains a list of secondary stations (12, 14, 16). A poll is transmitted poll by a primary...
5596574 Method and apparatus for synchronizing data transmission with on-demand links of a network  
A novel synchronization mechanism synchronizes delivery of data packets over on-demand links of a computer network in a manner that efficiently utilizes those links. The mechanism comprises...
5594733 Multi-station bus system having means for polling and updating of globally relevant information, in particular a station address, and station for use in such system  
A communication system has multiple and uniformly weighted station interconnected by a shared digital bus. A particular station comprises globally relevant information, and, with a predetermined...
5581707 System for wireless collection of data from a plurality of remote data collection units such as portable bar code readers  
In order to collect data messages at a base station which is in radio communications with portable data collection terminals, such as bar code readers, that may move between different locations,...
5577043 Method and apparatus for controlling information transmission on a multipoint link  
A method and apparatus for controlling communications on a multipoint communication link includes a multipoint link (29) coupling plural slave stations (11-13) and a master (10) having a...
5565745 Communications protocol  
A protocol for communication between devices connected via a bus having three handshake lines and at least one data line. A first device controls two of the three handshake lines, and a second...
5563883 Dynamic channel management and signalling method and apparatus  
There is provided a dynamic and adaptable method and apparatus to support two-way multi-media communication services on a multiple access communication system, which comprises a central...
5563874 Error monitoring algorithm for broadband signaling  
The error performance of an ATM signaling link operating under the service specific connection oriented protocol (SSCOP) is monitored at the transmitting end of the link by attributing a penalty...