Patent
Circuit configuration for routine testing of the clock supply of a large number of units operated with the same clock
TLDR
A circuit configuration for the routine testing of the clock supply of a large number of digital TDM telecommunication units operated with the same clock, wherein a clock supply with stand-by generator through a corresponding arrangement of several monitor circuits and arrangements of on/alter switches, the operatability of the monitor circuits themselves can be tested as discussed by the authors.Abstract:
A circuit configuration for the routine testing of the clock supply of a large number of digital TDM telecommunication units operated with the same clock, wherein a clock supply with stand-by generator through a corresponding arrangement of several monitor circuits and arrangements of on/alter switches, the operatability of the monitor circuits themselves can be tested so that on routine testing independent of the switching position of a change-over switching device effective upon switching a generator from stand-by operation to active operation respectively the same generator always acts upon the partial distribution system.read more
Citations
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Patent
Clock generation circuit
TL;DR: In this paper, the authors considered a system in which active and standby units, each used to control a VCXO on the basis of a reference signal from a GPS receiver to generate a high-precision clock, constitute a redundant arrangement, and a clock is output from the active unit.
References
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Patent
System clock for electronic communication systems
TL;DR: In this article, the system clock is designed in such a way that a single failure of any kind will not prevent the generation of clock pulses, and the clock card is wired for redundant operation.
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Redundant clock system utilizing nonsynchronous oscillators
TL;DR: In this paper, a clock system is disclosed having two identical clocks not synchronized with each other, each of which includes a circuit for selecting the output of one of the clocks as the present system output.
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Device for increasing the operational security of a duplicated clock
TL;DR: In this paper, the authors propose a scheme for increasing the operational security of a duplicated clock which comprises first and second clocks, where in each clock a selector circuit with inputs connected to a filter and signal shaping circuit of each clock.
Patent
Synchronization method and apparatus in redundant time-division-multiple-access communication equipment
Sachio Miyazaki,Shinichiro Aoki +1 more
TL;DR: In this article, the synchronization between an active circuit and a standby circuit is carried out using a frequency divided signal from the active transmission frame timing signal instead of using the transmission-frame timing signal.
Patent
Glitchless clock signal control circuit for a duplicated system
TL;DR: In this paper, a control circuit for receiving clock signals from duplicated sources, such as a pair of Time Slot Interchanges (TSI) and for normally extending the clock signal of the on-line source to clock signal utilization devices such as digital port boards is presented.