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Clock calibrater for program control switchboard system

A technology of program-controlled switches and system clocks, applied in the direction of time-division multiplexing selection devices, selection devices, automatic power control, etc., can solve problems such as increased costs, difficult technical implementation, and complex systems, so as to improve timing accuracy, Reduce the workload of manual maintenance and improve the effect of clock accuracy

Inactive Publication Date: 2010-05-05
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of this method is high precision and good long-term stability; the disadvantage is that the system is complex and technically difficult to implement, and additional equipment such as GPS system and time server are required, which increases the cost

Method used

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  • Clock calibrater for program control switchboard system
  • Clock calibrater for program control switchboard system
  • Clock calibrater for program control switchboard system

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Experimental program
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Embodiment Construction

[0031] The implementation of the technical solution will be further described in detail below in conjunction with the accompanying drawings.

[0032] figure 1 Introduces the overall structure block diagram of the real-time clock calibration device of the program-controlled exchange system. The circuits related to the clock calibration system include: a processor system (101), which is composed of a central processing unit, a bridge chip, a memory, and a peripheral interface. It runs an operating system and The switch system control and business program, and the software control program of the clock calibration system are also executed by the processor system (101).

[0033] The bus is a standard bus interface provided by the processor system (101) to external devices. The clock calibration function unit (102), the real-time clock unit (103), etc. can be used as bus devices and can be directly connected to the bus to expand the processor system (101). Peripheral function inter...

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Abstract

The device consists of: processor and its peripheral circuit; bus clock unit; and crystal oscillator. It also includes a clock alignment unit comprising of synchronous network interface unit, clock extract unit, clock processing and difference driving unit, clock difference receiving unit, digital PLL, crystal oscillator of PLL and hardware counter. The method includes: the device above is used toextract the clock source from synchronous digital switch network to take as benchmark of timing and to be in use for aligning the clock of software. By using the invention, the highly precise and highly stabilized clock source in data switch network can be used to make alignment.

Description

Technical field: [0001] The invention relates to an automatic calibration of a real-time clock of a program-controlled exchange system, in particular to an automatic calibration technology of a real-time clock of a main processor circuit in the field of a fixed telephone exchange system and a mobile communication exchange system. Background technique: [0002] The real-time clock of the main processor of the program-controlled exchange is the clock reference of the billing system and other units of the switch system. The accuracy and stability of the real-time clock of the main processor are of great significance to the billing system and other units. Effective measures need to be taken to ensure the clock precision and stability. [0003] The more commonly used method at present is to design a real-time clock circuit in the main processor circuit, select a crystal oscillator with a relatively high precision level as the clock timing reference, and generate a real-time clock...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q11/04H04Q3/545G06F1/14H03L7/08
Inventor 孟春才焦睿袁磊峰杨思远李俊
Owner ZTE CORP
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