A communication network is provided for transmitting data in a hostile electromagnetic environment. Master and slave units are coupled to a data path by transformer coupling. The slave units can be turned on by applying a DC voltage between transfomer taps at the master, and detecting the voltage at corresponding taps at the slave. Separate pairs of conductors are used to carry signals transmitted by the master and signals transmitted by the slave. The conductors form a closed loop data path ena...

A network element in a telecommunication network providing a number of different types of services, supports several telecommunication network applications (1304, 1306). It furthermore contains system resources and management information software. This software includes application specific management information and management information for system resources common to the applications, and is available to an operations system for managing the system resources when they are to be used. All of s...

In a communication network for communication between a plurality of nodes over a multi-channel communication medium 6, the network has a number of allocatable channels, . . . for data communication between nodes and a control channel 26 for allocating the allocatable channels to individual nodes. At least one of the channels operates under a token-passing protocol with a limited message packet length whereby selected messages may be sent between nodes with a predetermined maximum delay. The toke...

Input signals inputted in respective unit circuits forming a synapse array pass through variable connector elements to be integrated into one analog signal, which in turn is converted into a binary associated corresponding signal by an amplifier. Two control signals are produced on the basis of the associated corresponding signal and an educator signal. The two control signals are fed back to the respective unit circuits, to control degrees of electrical coupling of the variable connector elemen...

A transceiver is provided for a station of a network of the type in which a plurality of stations are connected via links to a network common point through which a transmission received from any of the stations passes on its way to any other of the stations. The transceiver includes adjustment means for setting the output power level of the transceiver transmitter. The adjustment means is operative, when the transceiver is in a calibration mode, to measure the attenuation in the station/common p...

A transmission network nodes, including electronically controlled distributors so that, in the case of a failure of a path, a substitute path can be switched in very rapidly. Switching orders sent to the nodes from a controller include an unambiguous designation of the digital path to be switched, and the source network node passes this designation on to the subsequent network nodes, so that the subsequent nodes can check their switching. Alarm signals which are normally passed on transparently ...

This invention relates to an information network such as a telepoint network, having discrete communications units, such as telephone communications handsets (14), where each unit has a user-inaccessible memory. The invention also applies to networks of other units, such as smart cards. The network has regional controllers (11 and 12) for funnelling information from base stations (10) into a central controller (13). At the central controller, analysis of past communications is carried out and, b...

A broadcast facility is provided in a synchronous network comprising a number of nodes (b 20l ) coupled via a star coupler (b 21l ). Data is transmitted via the network in a sequence of frames. Each node with a public write to send transmits it to all system nodes (including itself) in the next available frame. Each node has its own identifying characteristic, e.g. a unique assigned frequency. These identifying characteristics determine the notional order in which data packets within a frame are...

In a network system having a plurality of LANs each connecting a plurality of terminals interconnected, a LAN interconnection switching unit for switching and relaying data receives data frames from LANs and sends out a call set-up frame including a call number assigned to a combination of source and destination terminal addresses and addresses of relaying interconnection switching units. The data received from LAN is segmented into packets, which are sent out together with the call number. The ...

Interconnecting network for simultaneous selective connecting of each of N inputs to one of N outputs has an input section which includes the inputs and contains at least the consecutive stages 1 to n-1 of a n-stage baseline network and has N outputs, and an output section which has N inputs which are connected to the N outputs of the input section, includes a n-stage baseline network and has N outputs which form the outputs of the interconnecting network. The order of the n-1 stages following t...