A circuit system and method of automatically recoverable available service clock

An automatic recovery and circuit system technology, applied in the direction of electromagnetic wave transmission system, transmission system, fault recovery arrangement, etc., can solve problems such as unrecognizable service signals, service signal frequency deviation or frequency instability, etc., to improve maintainability, low cost effect

Active Publication Date: 2010-09-29
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] When the optical signal input by the system has a quality problem, the optical transponder board loses a stable and reliable frequency source. At this time, the output service signal clock fails because there is no available synchronization source, and the optical transponder board sends the downstream service signal There will be obvious frequency deviation or frequency instability, so that downstream nodes may not be able to recognize the AIS alarm inserted in the service signal

Method used

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  • A circuit system and method of automatically recoverable available service clock
  • A circuit system and method of automatically recoverable available service clock
  • A circuit system and method of automatically recoverable available service clock

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Embodiment Construction

[0027] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] The overall structure of the optical forwarding board system in a preferred embodiment of the present invention is as follows figure 1 As shown, the service light (not shown) on the line side enters the optical receiver 11, and the optical receiver 11 extracts the clock 17 and service data 12 recovered from the service light, and then sends the clock 17 recovered from the service light to the PPL part 18, and send the clock 17 and service data 12 recovered from the service light to the service processing part 13, the service processing part 13 will perform some overhead processing, and then send the service data 15 and the synchronous transmission clock 14 to the optical transponder 16, while The PPL part 18 provides the transmission reference clock 19 to the optical transponder 16 and the service processing part 13, and then the...

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Abstract

The invention provides a circuit system capable of automatically recovering and using a service clock and a method thereof. The invention comprises a phase-locked loop, a 2-channel analog switch, an analog to digital converter, a digital to analog converter, a processor, and a nonvolatile memory. The phase-locked loop comprises a voltage-controlled oscillator. The phase-locked loop is connected with the 2-channel analog switch and the analog to digital converter, receives the clock from the optical recovery and provides the transmission reference clock. The analog to digital converter is connected with the 2-channel analog switch. The processor is connected with the analog to digital converter and the nonvolatile memory. The digital to analog converter is connected with the processor. The2-channel analog switch is connected with the digital to analog converter and the voltage-controlled oscillator. The invention has the advantages of the lower cost, being easy to diagnose fault and improvement of the maintainability of the system.

Description

technical field [0001] The invention relates to the field of optical communication equipment, in particular to a circuit system and method capable of automatically recovering available service clocks. Background technique [0002] In the wavelength division transmission system, the main function of the optical transponder board is to convert the service optical signal of any manufacturer that meets the requirements of the G.691 recommendation into an optical signal that meets the requirements of the G. Error correction coding, overhead detection processing. [0003] Inserting an alarm indication signal (Alarm Indication Signal, hereinafter referred to as AIS) into the output optical service signal is one of the contents of its overhead processing work: when the quality of the input optical signal of the system deteriorates and the service cannot be transmitted normally, the optical forwarding board It is necessary to insert an AIS alarm into the service signal to notify the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/02H03L7/08H04B10/03
Inventor 刘培元
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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