Telephone exchange apparatus with communication line clocking

Details Telephone exchange apparatus with communication line clocking Telephone exchange apparatus with communication line clocking

1991-05-06

1994-07-19

Dwyer, James L.

Pulse or digital communications

Spread spectrum

Direct sequence

3701001, 375108, 375110, 375118, 375120, 379242, 379290, H04L 700, H04L 702, H04J 306, H04M 300

Patent

active

053316673

ABSTRACT:
In a telephone exchange apparatus which accommodates digital communication liens and employs a slave synchronization system in which a clock is extracted from a signal received from the network, an exchange switch is operated in synchronism with the extracted clock so as to prevent data omission caused by a difference between operating frequencies of a network and an exchange apparatus. If there is a phase difference between a pre-switching clock and a post-switching clock when the extracted clocks are switched upon changing communication lines, the postswitching clock is delayed by the phase difference between the two clocks so as to cause the phase of the post-switching clock to coincide with the phase of the pre-switching clock.

REFERENCES:
patent: 4675885 (1987-06-01), Gagliardi et al.
patent: 5034967 (1991-07-01), Cox et al.
patent: 5038351 (1991-08-01), Sakai et al.
patent: 5051990 (1991-09-01), Kato
patent: 5138635 (1992-08-01), Ballance

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