Alcatel N.v.

Alcatel Lucent

Jan L De Groote

Richard Marion Czerwiec

Marlin Vaughn Simmering

Gert Van Der Plas

Willem J Verbiest

Richard Roger Rzonca

Peter I Barri

Geert Arthur Van Wonterghem

Jan A Vandewege

Werner J Stessens

Chris Frans Deloddere

Joost Allaert

Hans A Van Parys

Vincent Pirson

A method for a system including a plurality of encoders each for receiving a first signal and encoding to generate a respective second signal for sending to a respective subscriber, comprising receiving, in each encoder, the first signal from a first source, while testing a signal path between a second source and the encoders, the first source on a first assembly, the second source on a second assembly, and each encoder on a respective third assembly, while each encoder is receiving the first signal from the first source, receiving, in each encoder, a third signal from the second source, generating, from each encoder, a fourth signal based on the third signal, the fourth signal being a redundancy signal and receiving and examining the fourth signal at the second source and subsequently receiving the first signal from the second source.

Communication system having enhanced reliability

A method is provided of determining access in a communication network having a main station (CS) and user stations (US1-USM) with distinct N-bit binary addresses, and having an access protocol including transmitting from the main station (CS) an invitation-to-send signal, and upon receipt thereof by the user stations (US1-USM), starting an access group which includes all user stations (US1-USM) wanting access to the main station (CS).

Method used in a communication network for determining access of user

The receiver processing circuitry performs the steps of an iterative process and in each step derives from a received signal Iin a threshold value related to a characteristic of the signal. This value is stored via an analog-to-digital convertor AD in a memory MEM. The characteristic of the signal Iin is then compared in a comparator consisting of two comparator circuits C1 and C2 and a switch S, with a threshold value stored previously for the substation which sent Iin. This value is prior to receipt of Iin, i.e. during a previous timeslot, applied to, e.g., C1 via a digital-to-analog convertor DA1. During this comparison a threshold stored for the substation which is next to transmit a signal is retrieved from MEM via a digital-to-analog convertor DA2. The result of the comparison is via S generated at Dout and represents the digital conversion of Iin. The power of the transmitted signals is controlled by a circuit included in the transmitters of the system. This circuit compares the peak power values of a maintenance signal coupled back via a backfacet diode D with reference values REF1 and REF 2 and controls a laser circuit L based on the result of the comparison stored in a memory MEM2.

Transmission system for transmitting signals in a burst mode

The access control arrangement controls access to communication channel of a plurality of interconnected units each of which has an own priority assigned to it. Each unit receives from a preceding unit an access request word comprising a plurality of successive request channels to which priorities are assigned and writes its own priority in the corresponding request channel. The request word is then transmitted to a following unit. When preceding unit has a priority exceeding the priority of the considered unit, these preceding units are inhibited from accessing the communication channel. When after a predetermined time interval, the considered unit is not inhibited by any of the following units, it may access the communication channel.

Priority based access control arrangement

Communication switching element (SE) with a plurality of input receiver circuits (RC01/16), a plurality of output transmitter circuits (TC01/17), and a plurality of control circuits (CMC01/08) each with a data write bus (DB01/08), with a plurality of data buffers (DB0101/1601); DB0108/1608) coupling the input circuits to the data bus, and with a plurality of RAMs (RAM0101/1701; RAM0108/1708) each with an input individually connected to the data write bus and with an output individually connected to a respective one of the output circuits.

Communication switching element

Growing community of inventors

Schilde, Belgium

Jan L De Groote