Telecom Italia

Cselt-Centro Studi E Laboratori Telecomunicazioni S.p.a.

Secondo Gallo

Margherita Miali

Vincenzo Lazzari

Roberto Fossati

Andrea Bergaglio

Renzo Ravaglia

A method of upgrading the software of a terminal of a telecommunication network, in particular a wired video telephone, includes the steps of periodically sending a first signal from the terminal to a service center via an intelligent network, the first signal including a service access code containing information related to the current software version installed on the terminal; checking, in a data base containing information on the different software versions available in the service center, if the current software version corresponds to a correct software version; sending from the service center to the terminal a second signal, in the form of a DTMF sequence, indicative of the result of the step of checking; possibly displaying a message on the terminal to inform the user that the software has to be upgraded; and remotely downloading the software.

Method and system for upgrading the software of a telecommunication terminal, in particular of a video telephone, and related computer program product

A terminal of a digital telecommunication system working in a so-called 'ping-pong' mode, with alternate reception and transmission of data words in respective halves of a recurrent operating cycle, has a phase-lock circuit whose oscillator is stabilized by a control signal periodically extracted from an incoming bit stream during the data-receiving phases. The receiving section of the terminal has a branch obtaining incoming bipolar data words from an input/output transformer and converting them, with the aid of a peak detector and an integrator or a monoflop, into respective timing pulses whose leading edges recur with the same periodicity as the data words.

Method of and means for synchronizing a receiving section of a digital

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Turin, Italy

Secondo Gallo