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Regional clock system and networking method thereof

A regional clock and networking technology, applied in the direction of time division multiplexing system, transmission system, digital transmission system, etc., can solve the inconvenience of maintenance, difficulty in synchronizing the time accuracy to meet the requirements, difficulty in receiving the first-level node to the second-level node, etc. problem, to achieve the effect of easy management

Active Publication Date: 2019-02-12
YANTAI CHIJIU CLOCK WATCH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Most of the existing clock systems use RS-422 or Ethernet to realize the networking of the first-level nodes and the second-level nodes. However, due to the serial interface, the synchronization time accuracy of the system can only reach the ms level, and it is difficult to synchronize the time. Accuracy meets the requirements
In addition, most of the existing clock systems are one-way transmission, that is, only the first-level nodes send time signals to the second-level nodes, but it is difficult for the first-level nodes to receive feedback from the second-level nodes. Faults require personnel to check one by one on site, and maintenance is extremely inconvenient

Method used

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  • Regional clock system and networking method thereof

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Embodiment Construction

[0039] The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.

[0040] Such as figure 1 As shown, in the regional clock system of the present invention, the first-level node is the root node of the system, and the second-level nodes are distributed on the communication nodes of the first-level nodes in the form of a bus. Specifically, a two-way four-wire channel is used between the first-level node and the second-level node. The two lines are one channel, and RS-485 bus or CAN bus can be used. One interface module transmits signals, such as transmitting IRIG-B (DC) signals, and the other is a loopback channel from the second-level node to the first-level node, and transmits signals through the second interface module, such as transmitting serial data packets.

[0041] Such as figure 2 As shown, another embodiment of the present invention is given, the difference is that a child node is added after the sec...

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Abstract

The invention relates to a regional clock system and a networking method thereof, and belongs to the technical field of time synchronization of watch clocks. By using a two-way four-wire channel, a time frame and a management frame are cyclically transmitted from a first-level node to a second-level node, and the second-level node sends a data message carrying corresponding status information to the first-level node according to the received management frame, which can improve the accuracy of the system on a limited transmission channel, and provide high-quality, high-precision synchronizationtime information.

Description

technical field [0001] The invention relates to a regional clock system and a networking method thereof, and belongs to the technical field of clock time synchronization. Background technique [0002] At present, in public places, such as bus stations, railway stations, airports, subways, etc., clocks are often hung to provide time to passing passengers. These clocks are usually divided into first-level nodes and second-level nodes according to levels. One, the number of secondary nodes installed can be adjusted according to the needs of the site. In order to ensure the consistency of time provided by nodes in different locations, more primary nodes are used to drive the time of secondary nodes. Therefore, it is necessary to combine the primary nodes and secondary nodes. Level nodes are connected to complete the networking of the clock system. [0003] Most of the existing clock systems use RS-422 or Ethernet to realize the networking of the first-level nodes and the second...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06H04L12/24
CPCH04J3/0638H04L41/04
Inventor 张学东王静房海川曹春蕾朱长红孙钰凯
Owner YANTAI CHIJIU CLOCK WATCH