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Synchronization system, synchronization method, first synchronization device, second synchronization device, and computer program

A technology of synchronization device and synchronization system, applied in the direction of synchronization device, transmission system, digital transmission system, etc., can solve problems such as deviation and synchronization accuracy deterioration.

Active Publication Date: 2013-11-27
NEC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, even if time synchronization is performed once between the time synchronization device 90 and the master device, the synchronization accuracy deteriorates with the passage of time and a deviation occurs.

Method used

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  • Synchronization system, synchronization method, first synchronization device, second synchronization device, and computer program
  • Synchronization system, synchronization method, first synchronization device, second synchronization device, and computer program
  • Synchronization system, synchronization method, first synchronization device, second synchronization device, and computer program

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no. 1 approach

[0030] figure 1 It is a system configuration diagram showing the system configuration of the first embodiment of the synchronization system (the synchronization system 100: corresponding to the "synchronization system" of the present invention). The synchronization system 100 includes: a clock generator 10, a time synchronization master device 20 (equivalent to the "second synchronization device" of the present invention), a relay device 30, a time synchronization slave device 40 (equivalent to the "first synchronization device" of the present invention "). exist figure 1 Although the synchronization system 100 includes one device, the number of devices included in the synchronization system 100 is not limited to one. In addition, the number of relay devices 30 installed between the time synchronization master device 20 and the time synchronization slave device 40 is not limited to one, but may be two or more.

[0031] First, the outline of the synchronization system 100 ...

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Abstract

Provided is a synchronization system comprising a first synchronization device and a second synchronization device which carry out synchronization processing by transmitting and receiving synchronization packets in accordance with a synchronization protocol and which synchronize the times thereof. The first synchronization device, which corresponds to a slave device, notifies an abnormality to the second synchronization device when an abnormality related to time synchronization processing is detected. The second synchronization device, which corresponds to a master device, increases the interval during which synchronization is performed as the length of time during which an abnormality notification is not received increases.

Description

technical field [0001] The present invention relates to a technique for synchronizing time between communicating devices. Background technique [0002] Conventionally, a technique for synchronizing time between communication devices located at physically separated locations has been proposed (see Patent Document 1). As an example of such a technique, there is a technique using packets for synchronization processing (synchronization packets). Figure 10 It is a figure which shows the example of the structure of the time synchronization apparatus 90 related to the above-mentioned technique. The time synchronization device 90 includes a synchronization packet transmission and reception unit 901 , a synchronization control unit 902 , a clock oscillator 904 , and a time management unit 905 . The time synchronization device 90 maintains the time counted by the time management unit 905 with a certain accuracy by the clock oscillator 904 included in the device itself. However, eve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00
CPCH04J3/14H04J3/0667H04J3/0638
Inventor 镰田慎也
Owner NEC CORP
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