Abstract: 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.

Abstract: A communication device (1) for computer local networks of the cordless type uses a modulator (MOD) able to perform FSK modulation on the data (DDI) to be transmitted, with optimum characteristics thanks to a digital switch (SW) controlled by the data (DDI) which commutes during transmission between two fixed frequencies received from a quartz oscillator, in association with a filter of the surface acoustic wave type (SAW). The device (1) permits a significant improvement in circuit integration and is simple and of low cost.