Alcatel

Alcatel Business Systems

Mark Medlicott

Gérard Vergnaud

Rémy Jaeger

Vincent Guntz

A first resistor is connected in parallel with a second resistor having a lower resistance than the first resistor. The voltage at the terminal of the first resistor is compared with a first threshold voltage, and the voltage at the terminals of the second resistor is compared with a second threshold voltage. A switching device either connects the first resistor in series in a remote power feed circuit, if the switching device detects that the remote power feed current is less than a third threshold current that is between the first and second threshold currents, or connects the second resistor and the first resistor, connected in parallel, in series in the remote power feed circuit if the switching device detects that the remote power feed current is greater than the third threshold current.

Device for remote power feeding a terminal in a telecommunication network, and a concentrator and a repreater including the device

A dual-mode synchronization device is designed in particular to recover the phase of the frame clock in a half-duplex transmission system. It is included in a receiver in a half-duplex digital transmission system in which a receiver receives frames only at regular intervals. The device comprises an energy sensing phase locking first system and a phase recovery second system which senses a reference pattern. A selector system selects one of the phase difference indications supplied by the first and second systems, under the control of a respective binary indication of loss or acquisition of synchronization. A particular application of the invention is to half-duplex transmission using the WAL2 code.

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Illkirch, France

Mark Medlicott