Olivetti Telemedia S.p.a.

Northern Telecom Limited

British Telecommunications Public Limited Company

Kenwood Corporation

Gpt Limited

Orbitel Mobile Communications Limited

At&t Wireless Communications Products Limited

Sixtel, S.p.a. Corp.

Andrew Bud

Franco Straullu

Nigel Everard Barnes

Peter N Proctor

Michael T Dudek

David C Odhams

Rupert Goodings

Ian Rodgers

Brian A Bidwell

Malcolm Crisp

Antonino Sgroi

Rino Furno

Luciano Campi

The present invention refers to a system and device 29 for the exchange of information between a cordless local network 10 using an asynchronous type communication protocol and a fixed telephone network 11 using a synchronous type communication protocol. The local network 10 has a central control unit 13 comprising an electronic computer 15 and one or more devices 29 capable of converting the information coded according to the asynchronous communication protocol into information coded according to the synchronous type protocol. The electronic computer 15 and the devices 29 enable the realization of a cordless telephony service node that is flexible, programmable and easily adaptable to telephone traffic requirements.

Multiprotocol system and device for information exchange

FSK communication device for digital information

Cordless local area network having a fixed central control device

A communication procedure suitable for a cordless telephone system involves time division duplex radio communication between a handset 11 and a base station 3 using alternating bursts of transmission over a single radio channel. Once a radio link has been set up, initial transmissions carry a synchronisation logical channel S and a signalling logical channel D multiplexed together, but the link may switch to bursts carrying a communications logical channel B for the speech data and the signalling logical channel D. Burst synchronisation is achieved by the asynchronous detection of words in a synchronisation channel S. These words have bit patterns reducing the probability of incorrect asynchronous detection of them. If one part ceases to receive handset signals from the other, it transmits a special signal, informing the other part. This enables both parts to detect the failure of a link at substantially the same time, so that their actions to re-establish the link are synchronised.

Time division duplex telecommunication system

Growing community of inventors

Ivrea, Italy

Andrew Bud