Local exchange equipment for a cable network

Details Local exchange equipment for a cable network Local exchange equipment for a cable network

1982-07-27

1985-06-11

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

358 86, 370 73, 455209, 455315, H04Q 900, H04N 716

Patent

active

045231907

ABSTRACT:
Switching system for transmitting program or data signals from an exchange to a number of subscriber posts, in which the processing of selection signals received by the exchange from the subscriber posts, the tuning of oscillators in the exchange, and the eventual correction of a drifting oscillator are carried out in separate control loops. In a first control loop, the subscriber posts are scanned for selection signals at a high scanning rate. In a second control loop, oscillators which must be tuned to a frequency corresponding to a received selection signal, are scanned and properly tuned within a scanning period. In a third control loop, all oscillators are scanned sequentially and a correction signal is provided if frequency drift has occurred in any oscillator.

REFERENCES:
patent: 4135157 (1979-01-01), den Toonder
patent: 4302771 (1981-11-01), Gargini
patent: 4313212 (1982-01-01), Whitlock
patent: 4398286 (1983-08-01), Geesen et al.
patent: 4400726 (1983-08-01), Van Hulle
patent: 4484218 (1984-11-01), Boland et al.

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