Implementation method by using digital picked clocking as analog reference source

An implementation method and a technology of reference sources, which are applied in multiplexing communication, time division multiplexing systems, electrical components, etc., can solve problems such as increasing the cost of network operators, increasing the cost of relay terminals and remote terminals, etc. , to achieve the effect of easy investment, small frequency error and cost reduction

Inactive Publication Date: 2010-04-14
COMBA TELECOM TECH (GUANGZHOU) CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the traditional method of processing reference sources is difficult to balance between performance and price. On the premise of maintaining high performance, it will lead to high cost of relay terminals and remote terminals, increasing the cost of network operators

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Implementation method by using digital picked clocking as analog reference source
  • Implementation method by using digital picked clocking as analog reference source
  • Implementation method by using digital picked clocking as analog reference source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0019] see figure 2 , this utility uses the digital extraction clock as the implementation method of the analog reference source, including the relay terminal 1, the remote terminal 2 and the transmission optical fiber, and the relay terminal 1 includes an analog frequency conversion board 11, a digital processing board 12, a phase-locked loop Circuit 14 and reference source 13, reference source 13 provides local oscillator and clock to analog frequency conversion board 11 and digital processing board 12 respectively through two-way phase-locked loop circuit 14, wherein reference source 14 uses temperature compensation to control the crystal oscillator, and uses voltage The control oscillator and the phase detector form the phase-locked loop circuit 14 of the relay terminal 1 .

[0020] The remote machine 2 includes a digital processing board 22 , an analog...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

In far end unit, multiplexer / demultiplexer of digital processing board is in charge for picking up clock signal from optical fiber as reference source for first order phase locked loop circuit. Afterthe first order phase locked loop circuit executes phase locking, clock is distributed for each chip in digital processing board to provide synchronized signal. The synchronized signal is as referencesource. After the second order phase locked loop circuit executes phase locking, the reference source is provided for analogy frequency conversion board as local oscillation. Thus, the invention makes reference source of whole system of straight through station possess relativity so as to guarantee smaller frequency error of system. Advantages are: avoiding use of costly thermostatically operatedcrystal oscillator, selecting number of stages of each phase locked loop circuit, crystal oscillator, and frequency of crystal oscillator freely, preventing use of oscillator in high frequency.

Description

【Technical field】 [0001] The invention relates to the field of mobile communication repeaters, in particular to a method for implementing digital extraction clocks as analog reference sources in long-distance digital optical fiber communication equipment. 【technical background】 [0002] see figure 1 , in the traditional digital repeater, in the relay terminal and the remote terminal, there are analog frequency conversion boards and digital processing boards to complete the uplink and downlink transmission and processing of signals. In the relay end machine, the constant temperature control crystal oscillator 1 is used as a reference source to provide the local oscillator and clock for the analog frequency conversion board and the digital processing board. After the signal is transmitted to the remote end machine, the clock is extracted from the signal transmitted by the optical fiber. In order to achieve signal synchronization, but in the analog frequency conversion board o...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06
Inventor 钱玫杨波
Owner COMBA TELECOM TECH (GUANGZHOU) CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap