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Implementation method by using digital picked clocking as analog reference source

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

Inactive Publication Date: 2006-12-06
COMBA TELECOM TECH (GUANGZHOU) CO LTD
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  • 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

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  • 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

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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...

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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. After the 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 reference source. 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 operated crystal 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 interrupt 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 boa...

Claims

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Application Information

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IPC IPC(8): H04J3/06
Inventor 钱玫杨波
Owner COMBA TELECOM TECH (GUANGZHOU) CO LTD
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