Nvidia International, Inc.

Telic Alcatel

Xavier Penet

Jacques Allouis

Patrick Hauptmann

Pierre Saint-Ellier

A modular expandable telecommunication system having a main cabinet and at least one expansion cabinet that are interconnected with each other to obtain an extended telecommunication system with increased connection possibilities for extensions and trunks. The main cabinet and each expansion cabinet have a transmission interface unit allowing connection of the expansion cabinet(s) to the main cabinet via a single transmission link conveying voice/data channels and low level signaling for mutual synchronization and clock recovery for all interconnected cabinets. The main cabinet has a master clock device, a CPU for running software applications and a DSP for routing the higher level messages issued by the CPU depending on the physical location of the expansion cabinet.

Modular expandable telecommunication system

A synchronizing system for a private digital exchange (1) comprising a logic control unit (4) and specialized interfaces (9, 8) whereby the exchange is connected firstly to a plurality of subscriber terminals (2) via SO accesses, and secondly to a telecommunications network (3) via TO base accesses. The exchange includes a time base (6) which associates a fixed frequency local oscillator (7) with a phase locked loop (32). The system includes clock switching means suitable for imposing the first clock signals to come from the network (3) via an active one of the TO base accesses and the associated interface (8) on the phase locked loop (32) of the time base (6) as soon as said first clock signals come close in phase to the substitute clock signals provided by the time base (6) in the absence of said first signals from the network.

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Illkirch Graffenstaden, France

Xavier Penet