Synchronizing system for a private digital exchange connected to

Details Synchronizing system for a private digital exchange connected to Synchronizing system for a private digital exchange connected to

1989-11-03

1991-10-22

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

370 681, 3701001, 3701101, 375120, H04L 7033

Patent

active

050602411

ABSTRACT:
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.

REFERENCES:
patent: 4161786 (1979-07-01), Hopkins et al.
patent: 4596025 (1986-06-01), Satoh
patent: 4633193 (1986-12-01), Scordo
patent: 4794596 (1988-12-01), Gloyne et al.
Siemens Telecom Report, vol. 11, No. 5, 1988, pp. 178-181-H. Beetz et al., "High-Precision Synchronization in the ISDN".
Fujitsu Scientific and Technical Journal, vol. 18, No. 3, Sep. 1982, E. Odera et al., "Fetex-150 Digital Switching System for Central Offices", pp. 351-380.

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