Timing signal generation and distribution system for TDM telecom

Details Timing signal generation and distribution system for TDM telecom Timing signal generation and distribution system for TDM telecom

1979-05-29

1980-10-21

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 13, 375107, H04J 306

Patent

active

042298164

ABSTRACT:
Synchronous operation of any number of digital switching units of a TDM system is maintained by interconnecting the switching units to a timing signal highway which distributes timing signals generated by sources of such signals in any one of the units. The units are connected successively in a chain by timing signal distribution control lines. Validity signals are generated and transmitted by circuits in each unit along the lines so as to provide for transmission of timing signals generated in the first switching unit on to the timing signal highway and switch over of the timing signal generating function to successive ones of the units when the timing signal generation in preceding units becomes faulty.

REFERENCES:
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patent: 3641474 (1972-03-01), Liberman
patent: 3940558 (1976-02-01), Gabbard et al.
patent: 3993870 (1976-11-01), Schwartz
patent: 4156112 (1979-05-01), Moreland
Oswald, "System Century DBX Application Software" Conference Record, vol. 1, International Communications Conference 1977, IEEE Cat. No. 77CH1209-6 CSCB.
Russell, "System Century DBX Real-Time Processing", Conf. Record, vol. 1, International Communications Conference 1977, IEEE Cat. No. 77CH1209-6 CSCB.
Gueldenpfennig, "Conceptual Systems Approach for a Digital PABX", Conference Record 1976, National Telecommunications Conference, IEEE Cat. No. 76 CH1149-4-CSCB.
Gueldenpfennig, "Distributed Control for Switching Systems", Conference Record, National Telecommunications Conference, 1975, IEEE Cat. No. 75 CH1015-7 CSCB.

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