Matches 251 - 292 out of 292 < 1 2 3 4 5 6


Match Document Document Title
5440540 Ring interworking between a bidirectional line-switched ring transmission system and another ring transmission system  
Communications circuit connectivity between a bidirectional line-switched ring transmission system and another ring transmission system is continued in the presence of the failure of a first...
5412652 Sonet ring subnetwork management method  
A method of managing a telecommunication subnetwork system composed of a number of network elements coupled together through an optical medium to form a Synchronous Optical NETwork (SONET) ring....
5383191 Dual ring reconfiguration switching unit  
A multiport access and reconfiguration unit for use in a dual token ring network is provided with three adapters and, depending on error conditions, can assume one of a plurality of recovery...
5351040 Control system for configuring ring LAN with improved reconfiguration operation  
In a ring LAN system having a configuration control unit serially connected to a dual ring transmission line, the configuration control unit is provided with a transmission line reconfiguration...
5341364 Distributed switching in bidirectional multiplex section-switched ringtransmission systems  
Long delays in bidirectional multiplex section-switched self-healing ring transmission systems are avoided by eliminating looping of communications signals when restoring them in response to a...
5335227 Serial network topology and recognfiguration generator  
A plurality of access ports in a serial communication network are bracketed by a pair of adapters each of which is connected to a programmed processor. The adapters have unique identities and take...
5317569 Alternate path FDDI standard LAN  
A local area network uses standard ANSI FDDI LAN concentrator stations and a first set of mutually reverse-direction data buses or loops, in conjunction with an additional set of mutually...
5278824 Dual hubbing in a bidirectional line-switched ring transmission system  
Communications circuit connectivity in a bidirectional line-switched ring transmission system is continued in the presence of the failure of a first ring node for communications circuits...
5218604 Dual-hubbed arrangement to provide a protected ring interconnection  
An arrangement of coupled hybrid rings is disclosed which can withstand a failed node or a cut ring in either or both of the hybrid rings, as well as an outage of one of the two serving nodes...
5189541 Method and apparatus for connecting branch networks with a trunk network in optical transmission system  
In an optical transmission system including a trunk LAN having duplex optical transmission lines, and branch LANs connected with the trunk LAN through nodes, an optical signal on the optical...
5150356 Dual-ring ATM communications system  
An ATM communications system has two ring transmission lines in which network nodes are connected for transmission of cells in opposite directions. Each cell contains a first identifier...
5132962 Fault isolation and bypass reconfiguration unit  
A multiport access and reconfiguration unit for use in a dual token ring network is provided with three adapters which in the presence of an internal fault establishes an isolated token ring which...
5091902 Telecommunications transmission security arrangement  
The telecommunications transmission security arrangement comprises first and second transmission paths, each having first and second serially connected circuit means. The first circuit means of...
5087911 Data communication network  
A data communications network comprises a plurality of terminals (30, 31, . . . 34) which are interconnected by a contra-rotative ring pair of lines (35, 36), so as to be able to send data to and...
5084863 System for interchanging messages in real time between stations interconnected by a loop link, in particular between stations in a telecommunications exchange  
The interchange system comprises stations connected to a loop link having two rings (A1, A2) making use of a token access method and operating in load sharing mode, with each ring providing all...
5081452 Self-healing system for a ring link with spare ring link means  
The stations (S1to SN) are interconnected in series by a ring (A), and the system of the invention includes a spare ring (AS) interconnecting the stations in series, together with two self-healing...
5049871 Loop communication system  
A loop transmission system includes a plurality of micronodes and a central processor operative as a supervisory station linked by two loop transmission lines each capable of transmitting in...
5042031 Double loop communications control system  
A configuration control method for a double loop communications system capable of handling simultaneously two different traffic modes for packet data and circuit-switched data, which includes a...
5003531 Survivable network using reverse protection ring  
In a data communications network comprising a series of nodes connected by optical fiber links providing direct bidirectional communication between adjacent nodes, and communication between...
4973955 Data transmission system  
A data transmission system comprising a plurality of connecting units, data lines interconnecting the connecting units in a sequence to form a data bus, and a plurality of data terminals. Each...
4973953 Data transmission system with improved fault  
A system of transmitting data and frame signals distinguishable from the data between a plurality of nodes linked in ring form. Each node comprising two transmitter circuits for simultaneously...
4937823 Ring network configuration  
In a ring network system including two transmission lines transmitting a signal in directions opposite to each other, and a plurality of line concentrators connected in the form of a loop by the...
4855993 Method and apparatus for detecting a fault in a ring network data transmission system  
A ring network data transmission system includes a plurality of transmission apparatuses, at least one terminal connected to each of the transmission apparatuses and double ring transmission paths...
4835763 Survivable ring network  
A survivable ring network is disclosed that can withstand a cut link or failed node, without the need for a central controller or protection switching among links. The disclosed invention...
4779087 Loop transmission system with frame synchronization control  
A loop transmission system with frame synchronization control includes a loop (1) through which information in the form of a sequence of frames is transmitted, a plurality of node units (51, 52, ....
4760488 Transmission control apparatus for duplex loop type transmission system  
This invention relates to a duplex loop type transmission system which is so constructed that a plurality of transmission stations are loop-connected with two transmission lines, and the control...
4736465 Communications network  
A digital optical fiber communications system includes a plurality of communications nodes, each of which may include a processor, at each of a plurality of different locations. For packet data...
4596982 Reconfigurable ring communications network  
A ring communications network which is automatically reconfigured based on the detection of system defects.
4501021 Fiber optic data highway  
A communications system having a data highway made up of two optical communications channels forming a ring to interconnect stations whose signals are interfaced with the ring by an...
4435704 Loop transmission system  
A loop transmission system including a plurality of stations connected in series in a looped transmission line to transfer data among the stations, wherein the stations include a supervising...
4380061 Loop transmission system with improved bypass routing arrangement  
A double loop transmission system is provided in which not only bypass routes but also terminals are connected with a pair of transmission control units of each loop. In this manner, the transfer...
4354267 Data transmission system utilizing loop transmission lines between terminal units  
There is disclosed a data transmission system comprising a first and a second loop transmission line for transferring data in its clockwise and counterclockwise directions, respectively. In each...
4347605 Multiplexed telecommunication systems  
A multiplexed telecommunication system includes two looped transmission lines connecting a plurality of stations. Each station transmits along both looped lines and receives only from the first...
4241330 Multiple-processor digital communication system  
A digital communication system is disclosed for communicating among two central consoles and a plurality of local controllers, such as may be used in a radiation and monitoring system and the...
4195351 Loop configured data transmission system  
A data transmission system which includes stations connected in a closed loop configuration with interface capabilities at each station to connect to an external data processor. Through this...
4190821 Self-healing loop communications system  
Primary and back-up closed loop unidirectional transmission lines transmit self-clocking data streams and null data, respectively, in opposite directions to a plurality of loop interface units...
4159470 Data communications systems employing redundant series transmission loops  
A loop communication system includes a loop controller originating and terminating parallel output multiple bit message frames over a pair of trunks to remote stations, each of which includes a...
4144410 Multiplex communication system  
A reconfigurable serial loop multiplex communication system for communication of digital and analog status and control information between field terminal locations or to a central control location...
4075440 Automatic communication system reconfiguration apparatus  
A communication system is illustrated wherein the communication links include automatically reversible amplifiers with the termination means of two links closing a loop. Upon failure of detection...
4035770 Switching system for use with computer data loop terminals and method of operating same  
A switching system for use with a plurality of data terminals connected in series in a loop, the ends of which are connected to a central computer so that the central computer may communicate with...
4009469 Loop communications system with method and apparatus for switch to secondary loop  
This invention relates to a system for communicating between a central station, such as a host processor, and one or more remote stations, such as terminal devices, on a pair of communication...
RE28958 Synchronous disconnection and rearrangement  
This is a communication loop system having a bidirectional transmission capability between terminals. The system is comprised of switching units which allow isolation of a loop segment and the...

Matches 251 - 292 out of 292 < 1 2 3 4 5 6