Matches 201 - 250 out of 292 < 1 2 3 4 5 6 >


Match Document Document Title
6456587 Ring transmission system and squelch method used for same  
A ring transmission system of a bidirectional line switched ring (BLSR) type comprising nodes (A) to (F) connected by ring transmission lines RL, wherein the nodes (A) to (F) have modified squelch...
6456407 Optical telecommunications networks  
The invention relates to an optical telecommunications network comprising several nodes (N1 . . . N8) interconnected by optical transmission paths that form several working rings (R1 . . . R5),...
6442134 ATM network with ring architecture  
In a method of establishing communication over a network a number of nodes are interconnected in a ring architecture. Virtual connections are set up on a pair of counter-rotating packet-based...
6414771 Optical transmission system including optical restoration  
An optical communications system employs a plurality of optical nodes interconnected in a ring configuration by at least two optical transmission media, for example, optical fiber. The at least...
6396602 Optical switching unit, particularly for switching to standby components in optical transmission systems  
An optical switching unit is disclosed which permits switching from faulty components to standby components in optical transmission systems. A component in this connection may be a transmit laser...
6385657 Chain transaction transfers between ring computer systems coupled by bridge modules  
A computer system employs a hierarchical ring structure for communication. Computer system elements are configured into modules with ring interface hardware, and the modules are coupled to one or...
6359860 Connection switching method and apparatus  
According to a connection switching method of a switch for selectively setting a connection path between a plurality of input lines and a plurality of output lines, the types of faults which may...
6333915 On-line line monitor system  
An on-line line monitor system is provided for fault diagnosis of signal processing blocks, which perform cross-connecting of ATM cells by using at least reception-side memory blocks, a SRAM block...
6295146 System and method for sharing a spare channel among two or more optical ring networks  
A system and method for sharing a spare channel among two or more optical ring networks that have a common span. A first optical cross-connect switch (OCCS) and a first OCCS controller are placed...
6292464 Apparatus and method for self routing control mechanism for restoring fiber optic communications network connections  
A system and method for connecting traffic along a communications network is accomplished by rerouting traffic upon the detection of a fault condition along a primary connection path. A...
6278689 Optical cross-connect restoration technique  
An alarm and restoration system (28) accomplishes restoration in a ring network (10l) by monitoring network traffic to detect the occurrence of a single failure arising from a failed optical...
6249510 Signal protection system for bi-direction ring network  
The channel protection facility in a two-fiber bi-directional line switched ring network may be significantly enhanced by protecting the service channels in one of the fibers with corresponding...
6240064 Ring structure 1:N duplex communication equipment and data communication method  
1:N duplex communication equipment which has a host device and slave devices interconnected in a ring form is disclosed. In the equipment, the path distributing part 3 of the host device transmits...
6226111 Inter-ring cross-connect for survivable multi-wavelength optical communication networks  
A cross-connect for a multi-ring, multi-channel telecommunications network, especially for a wavelength-division multiplexed (WDM) optical network. Each of the interconnected rings is self-healing...
6219336 Terminal multiplexer and method of constructing the terminal multiplexer  
A terminal multiplexer is constructed in such a manner that it can be upgraded for adapting to a change in a transmission system. Line terminating equipment (LTE) having working high speed...
6198721 Method and system for data transmission in a ring network  
A method and system for data transmission in a 2-fiber ring network having a plurality of network nodes wherein working signals are bidirectionally transmitted between terminal multiplexers and...
6160648 Method and arrangement for detecting faults in a network  
The present invention relates to an arrangement and a method for detecting faults in an optical fiber network, comprising at least two nodes arranged with at least two optical fibers to a bus with...
6147967 Fault isolation and recovery in a distributed control network  
A control network has a bus to which is connected a master node and a plurality of slave nodes in a loop configuration. Each of the master node and slave nodes has a transceiver connected to the...
6088141 Self-healing network  
A communication network system having at least three nodes, which are interconnected by transmission links carrying traffic to and from the nodes. The transmission links are divided into a working...
6061335 Method for designing SONET ring networks suitable for local access  
A method is provided for designing a hierarchical architecture for a synchronous optical network (SONET) given a plurality of demand nodes at which communications traffic originates and at least...
6011774 Order-wire signal handling apparatus  
An apparatus for processing an order-wire signal capable of providing a high quality communication between operators through an order-wire channel for use in a synchronous add drop...
6005842 Engineering order wire  
An engineering order wire arrangement is provided for a synchronous telecommunications network comprising a plurality of nodes interconnected via transmission paths, each path accommodating a...
5983294 Synchronous cross-connect system with the function of ring network interworking using backplane interconnection  
Disclosed is a synchronous cross-connect system with an integrated 2.5 Gbps (STM-16) I/O link and a ring network interworking. The synchronous cross-connect system includes: first and second I/O...
5926102 Method for controlling bidirectional line protection switching by using a remote defect indication signal  
A method for controlling bidirectional line protection switching by using a remote defect indication signal. The method includes the following steps of: inserting and transmitting a remote defect...
5923449 Optically restorable WDM ring network using simple add/drop circuitry  
A parallel ring network is restorable upon sensing a failure of a transmission media. A central transmitter is coupled to one end of a first transmission medium. A central receiver is coupled to...
5920543 Double ring-type local area network system capable of switching transmission paths without interruption  
In a ring-type network system including a plurality of nodes connected by an L-ring and a R-ring, each of the nodes is constructed by a branch unit for branching data to first and second...
5909175 Connection switching circuit for ring system  
A connection switching circuit is disposed in each node of a ring system in which a first ring and a second ring are provided with two communication lines which allow data to flow in a different...
5862311 Inter-equipment data link system  
An inter-equipment data link system performs a data link between double equipments of an A data transmission equipment and a B data transmission equipment. In the system, a monitor output of the A...
5844889 Different system transfer method for a ring transmission system and transmission apparatus  
There is provided a different system transfer method for a ring transmission system and a transmission apparatus for transferring the ring transmission system constructed in the UPSR system to the...
5822298 Ring transmission system for providing efficient transmission of management data  
A ring transmission system includes nodes connected in a ring shape by transmission lines to communicate with each other. Each node includes a cell extracting unit which receives a cell from the...
5815490 SDH ring high order path management  
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 Digital Hierarchy (SDH) network...
5815489 Self-healing ring switch and method of controlling the same  
A self-healing ring switch transmission system uses space division switches disposed upstream and downstream of an add drop switch in order to determine a correspondence with a plurality of...
5805568 Add/drop multiplexer for supporting fixed length cell  
In an add/drop multiplexing apparatus, a fixed length cell such as an ATM cell can be handled in addition to the existing data services. The add/drop multiplexing apparatus for supporting a fixed...
5799001 Composite network protective/recovering device for synchronous digital hierarchy DXC  
A composite network protective/recovering device includes first to fourth input/output (I/O) modules. The first and third I/O modules are operational modules and the second and fourth I/O modules...
5790520 Path protection switch ring system for line saving even though line setting operation was not carried out  
A path protection switch ring system has a working line, a protection line, and a plurality of add/drop multiplexers. The add/drop multiplexer has a path-switch unit, an unequipped signal...
5754551 Ring communication system and method for connecting a plurality of end stations  
A method of connecting a new end station to a ring communication system for connecting a number of end stations is constituted by the steps of: i) sensing an attempt by the new end station to...
5751696 Multiplexed-communications network having mixed protection against faults and errors  
A dual-ring, multiplexed-communications network to deliver protected service to nodes where protection is required, while simultaneously other nodes of the same network, where only unprotected...
5742585 Network for connecting a plurality of nodes using a plurality of channels  
In a network system, a loop-shaped transmission path is constituted by multiplexing a plurality of loop-shaped transmission channels. A plurality of nodes are connected to the loop-shaped...
5719917 Circuit for activating back-up lines  
Disclosed is a circuit which permits automatic switching between a main line and spare line at a subscriber's network interface device. A relay is provided between the two lines, which relay is...
5717796 Optical fiber transmission system utilizing a line switched ring to provide protection  
Protection is provided by switching an optical transmission signal. An optical transmission system operating in a ring configuration, comprises optical transmitters and optical receivers connected...
5661720 Multi-ring network having plural rings connected by node  
A multi-ring network structured by connecting a plurality of rings having different speeds. The multi-ring network includes a first ring structured by connecting a plurality of first nodes by a...
5602827 Method and apparatus for correcting a defect in a token ring network  
Beacon recovery is performed separately on each module. After a module recognizes that a beacon condition has occurred, each module checks to determine if the defect or fault is on its module. If...
5572534 Method for merging wrapped media segments onto a working network  
A process for testing a wrapped segment of a dual token ring transmits idle signals on the segment and monitors the received signals. If either an Active Monitor, Standby Monitor or Beacon frame...
5546378 Fault tolerant FDDI wiring hub  
A wiring hub for interconnecting a plurality of switching units, includes a plurality of interface modules for connection to respective external switching units in a dual-attached connection, and...
5537393 BLSR network having path-AIS generation function  
A bidirectional line switched ring network having a path alarm indication signal (AIS) generation function, which is provided with ID writing means for writing, in the path overhead bytes of...
5535035 Optical fiber ring communications system and communications method  
A communications method and an optical fiber ring communications system including multiple devices or ports are provided. The optical fiber ring communications system includes first and second...
5535192 Serial network fault detection, isolation and restorative device  
A serial network fault isolation device for use in a network hub has receive and transmit buffers connected to the network. An isolation switch which allows the receive buffer to receive network...
5530694 Device for connecting a station to a local area network comprising at least one ring  
A device for connecting a station to a local area network comprising at least one ring includes switching arrangements associated with circuits for regenerating a signal in order to bypass a...
5517489 Synchronous digital hierarchy 2-fiber ring having a selective protection function  
An SDH (synchronous digital hierarchy) 2-fiber ring network optical multiplexing device, which, in order to increase the amount of usable bandwidth when the network is operating normally by...
5491686 Composite ring network having an increased redundancy for restoring communication path  
A composite ring network includes two ring networks each having a plurality of nodes and connected to each other by a bridging path which sustains a signal format different from the one used in...

Matches 201 - 250 out of 292 < 1 2 3 4 5 6 >