Abstract: A repeater for use in a radiocommunication network for relaying data communications between first and second stations between which data communication via the radiocommunication network alone is impossible includes a first converter for converting a first radio signal received from the first station into the form of first receive messages and converting first transmit messages into the form of a first radio signal transmitted to a first station. A second converter converts a second radio signal received from said second station into the form of second receive messages and second transmit messages into the form of a second radio signal transmitted to the second station. An application controller manages the first receive messages and the first transmit messages and the second receive messages and the second transmit messages.

Abstract: Data is stored on a prewritten optical data storage medium along a track made up of adjacent elements. A scanning light spot focussed on the medium has to be able to access any element to write, read or modify data there. Prewritten patterns on the medium define a radial graduation scale that is analysed by an optical scaning device using a sampling technique to determine the absolute position of the scanning light spot relative to the track elements, the only material representation of which may be discrete prewritten elements. The technology is particularly applicable to very high density optical memories using a prewritten disk written by thermo-optical interaction with an intensity modulated laser beam.

Abstract: Data is stored on a prewritten optical data storage medium along a track made up of adjacent elements. A scanning light spot focussed on the medium has to be able to access any element to write, read or modify data there. Prewritten patterns on the medium define a radial graduation scale that is analyzed by an optical scanning device using a sampling technique to determine the absolute position of the scanning light spot relative to the track elements, the only material representation of which may be discrete prewritten elements. The technology is particularly applicable to very high density optical memories using a prewritten disk written by thermo-optical interaction with an intensity modulated laser beam.