Communications: electrical – Continuously variable indicating – With meter reading
Patent
1982-03-01
1983-11-22
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
3408252, 370 86, 375107, H04Q 900, H04L 708, H04J 308
Patent
active
044172427
ABSTRACT:
In a ring communication system comprising selectively connectable data stations, each station has connecting circuitry including a phase-locked loop arrangement (111) which is frozen at its current frequency and phase in response to a signal interruption caused by a station insertion or removal operation. Control logic (113) generates a freeze control signal in dependence of the signal energy status on input lines (75). This control signal activates gates (149, 151) and switches (155, 157) to interrupt change control signals of the phase-locked loop circuitry and to keep an oscillator control voltage at a given value. The control logic also provides an auxiliary data signal during the freeze interval which is applied to the ring to keep stations downstream in synchronism. By this method and arrangement, undesired reactions and excursions of the phase-locked loop circuitry in response to a signal energy outage are prevented, and synchronization can be rapidly regained after station insertion or removal.
REFERENCES:
patent: Re28577 (1975-10-01), Schmidt
patent: Re28958 (1976-09-01), Zafiropulo et al.
patent: 4002847 (1977-01-01), Dail
patent: 4042783 (1977-08-01), Gindi
patent: 4334305 (1982-06-01), Girardi
European Patent Application, 0006325, Published Jan. 9, 1980, Champlin et al.
Bapst Urs
Keller Heinz
Meyr Heinrich
Muller Hans R.
Frisone John B.
International Business Machines Corp.
Yusko Donald J.
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