Method and apparatus for establishing a system clock in response

Details Method and apparatus for establishing a system clock in response Method and apparatus for establishing a system clock in response

1987-10-16

1989-06-13

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328 63, 328 72, H03K 513, H03L 700

Patent

active

048395340

ABSTRACT:
A system clock is produced either from clock signals (t1) recovered in a clock regenerator, based on surface wave filtered technology and having level fluctuations, or from the digital clock signals (t2) internally generated in, for example, an access controller of a ring network, in response to the level of the regenerated clock signals (t1). The change in the source of the system clock is accomplished after an early detection of the level fluctuations, so that the clock signal (t1,t2) currently connected to the clock line are disconnected and, after a short delay time, the other clock signal (t1,t2) is sychronously switched to the clock line.

REFERENCES:
patent: 3609391 (1971-09-01), Hatano et al.
patent: 4524291 (1985-06-01), Lehning
patent: 4528591 (1985-07-01), Liepe et al.
patent: 4529892 (1985-07-01), Reilly et al.
patent: 4571547 (1986-02-01), Day
Siemens LWL-Komponenten, Wandler, Sender und Empfanger, MeBzubenhor, pp. 92-95, date unknown.

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