System time calibrating method between main apparatus and stand-by apparatus in back-up system

A technology of backup equipment and system time, which is applied in a variety of digital computer combinations, instruments, electrical digital data processing, etc., can solve problems such as large system overhead, complex algorithms, and inability to take advantage of the advantages of the NTP protocol, achieving low overhead and high precision Effect

Inactive Publication Date: 2006-08-09
HUAWEI TECH CO LTD
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Problems solved by technology

The NTP protocol is based on the IP and UDP protocols. The main advantage is that it is suitable for time calibration between the time server and the client on the Internet, and the time calibration accuracy is high; the disadvantage is that the calibration method is complicated, and the algorithm used is also relatively complicated, which is not easy to implement. The system The cost is also relatively large
For some application systems, the advantages of the NTP protocol cannot be used

Method used

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  • System time calibrating method between main apparatus and stand-by apparatus in back-up system
  • System time calibrating method between main apparatus and stand-by apparatus in back-up system
  • System time calibrating method between main apparatus and stand-by apparatus in back-up system

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Embodiment Construction

[0023] The present invention mainly solves the time calibration between two or more modules in a communication device or a time server and a client in a small network, such as figure 1 and figure 2 Shown is a schematic diagram of the time calibration network model of the present invention. It can be seen from the figure that the network model mainly includes a time server (Server) and one or more (Host1, Host2, . . . ). In this embodiment, the time server is the master device, and the client is the backup device.

[0024] In order to transmit information on the master device (hereinafter referred to as the main board) to the standby device (hereinafter referred to as the standby board), there must be a communication channel between the main board and the standby board. The communication channel used in this technical solution is the communication channel provided by the Ethernet switch, hereinafter referred to as the IPC channel. Through the IPC channel, information exchang...

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Abstract

The present invention discloses a method for calibrating the system time between a main apparatus and a spare apparatus in a back-up system, being: the spare apparatus initiates a periodic circle timer to transmit periodically a time calibrating requesting message to the main apparatus, the main apparatus transmits a time response message to the spare apparatus in response to the request and carries the system time of the main apparatus, the spare apparatus stops said timer and records the first packaging time after receiving the response message, the spare apparatus transmits again a time calibrating request to the main apparatus, records the times of transmitting requests and records the second packaging time according to the response message for the request; the spare apparatus determines the time calibrating error according to the first packaging time and the second packaging time, and the system time of the spare apparatus will be set to be the system time of the main apparatus added with the time calibrating error if the error is not larger than a permissible error, otherwise the calibration fails or the calibration is continued will be determined according to the times of the calibrations have been requested.

Description

technical field [0001] The invention relates to a method for calibrating system time between main equipment and standby equipment in a backup system. Background technique [0002] In carrier-grade communication electronic equipment, the stability and reliability of the equipment are the basis for providing good service. Generally, in order to provide more stable services, hot backup technology is widely used in telecommunication equipment. When the main equipment fails, it will automatically switch to the standby equipment to provide uninterrupted service and minimize call loss. Therefore, the real-time synchronization of information must be maintained between the backup device and the master device. In many cases, the consistency of system time is an important basis for information synchronization. So first the system time must be calibrated between the standby and the primary. Usually different applications have different requirements on the time offset between the mast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F15/16G06F13/00
Inventor 郭东平先军张丙库
Owner HUAWEI TECH CO LTD
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