Method, system and device for switching and selecting clock source equipment
A source device and clock technology, applied in the field of systems and devices, clock source device switching and selection methods, can solve problems such as failure to select a valid clock source device, blocked uplink path of the clock source device, etc., to ensure correctness and clock synchronization Effect
Active Publication Date: 2011-07-13
ZTE CORP
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[0005] Embodiments of the present invention provide a method, system, and device for switching and selecting clock source devices, which are used to solve the problem that an effective clock source device may not be selected due to the blocking of the upstream path of the clock source device when switching and selecting existing clock source devices
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[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0026] An embodiment of the present invention provides a method for switching and selecting a clock source device. For a device that uses the 1588 clock synchronization protocol for time and frequency synchronization, when the clock slave device is connected to the clock source device, the validity of the clock source device is determined so that the clock source can be correctly selected. Device Selection. The method realizes bidirectional communication link detection through the detection and detection feedback mechanism between the clock slave device...
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The invention discloses a method, system and device for switching and selecting clock source equipment. The method comprises the following steps of: transmitting a link detection message to the clock source equipment when clock slave equipment receives an announce message transmitted by the clock source equipment; determining that the clock source equipment is effective clock source equipment when the clock slave equipment receives a detection feedback message which is fed back by the clock source equipment according to the link detection message; adding the effective clock source equipment into a backup clock source equipment list when the clock slave equipment determines that the effective clock source equipment is stable clock source equipment; and selecting close source equipment from the backup clock source equipment list when the clock slave equipment requires switching clock source equipment. The communication situation of an up-link is detected through the link detection message and the detection feedback message, so that reliable clock source equipment is found, and accuracy of clock synchronization of the clock slave equipment is ensured.
Description
technical field [0001] The invention relates to the field of communication technology, in particular to a method, system and device for switching and selecting clock source equipment. Background technique [0002] Precision Time Protocol (Precision Time Protocol, PTP)—IEEEESTD1588 protocol is one of the important technologies in the field of time and frequency synchronization control. The 1588 protocol stipulates that if each device receives 2 announce messages from a certain clock source device within the time of 4 announce messages, the source is considered stable. Generally, the clock slave device records five such clock source devices as alternative sources, and then selects the one with the highest priority as the current system clock clock source device through the best clock algorithm (Best Master Clock Algorithm, BMC) algorithm. When the announce message is received overtime, it is considered that the link between the clock slave device and the clock source device h...
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IPC IPC(8): H04L7/00H04L12/56H04L29/06
CPCH04J3/0667H04L49/00H04J3/0641
Inventor 王斌刘东甲
Owner ZTE CORP