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Airborne network IEEE1588 protocol transparent clock port synchronization method

An IEEE1588, transparent clock technology, applied in the direction of synchronization devices, digital transmission systems, electrical components, etc., can solve the problems of clock synchronization, boundary clock synchronization error step-by-step amplification, etc.

Inactive Publication Date: 2016-06-01
CHINESE FLIGHT TEST ESTAB
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Problems solved by technology

[0005] The present invention mainly uses an airborne network IEEE1588 protocol transparent clock port synchronization method to solve the problem of step-by-step amplification of the synchronization error existing in the boundary clock in the PTP protocol of the existing networked airborne test system and the synchronization of the local clock in the transparent clock node

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  • Airborne network IEEE1588 protocol transparent clock port synchronization method
  • Airborne network IEEE1588 protocol transparent clock port synchronization method
  • Airborne network IEEE1588 protocol transparent clock port synchronization method

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Embodiment Construction

[0026] The IEEE1588 protocol transparent clock port synchronization method for an airborne network of the present invention, the IEEE1588 protocol transparent clock includes an uplink analysis unit, an uplink encapsulation unit, a PTP message processing unit, a downlink encapsulation unit, a downlink analysis unit, a PTP time stamp and dwell time bridge unit, and a processing unit. device, local clock unit, and MAC hard core (see figure 1 and figure 2 ), the steps for synchronizing the transparent clock and the slave clock are as follows:

[0027] Step 1: Receive the synchronization (Sync) message sent to the local and record the arrival time stamp of the synchronization (Sync) message

[0028] The MAC hard core receives the local synchronization (Sync) message sent by the main clock port of the PTP domain, and at the same time, the PTP time stamp unit records the time stamp t2 of the synchronization (Sync) message arriving at the GMII / MII interface, and reports t2 to the lo...

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Abstract

The invention provides an airborne network IEEE1588 protocol transparent clock port synchronization method. An IEEE1588 protocol transparent clock comprises an uplink analysis unit, an uplink packaging unit, a PTP message processing unit, a downlink packaging unit, a downlink analysis unit, a PTP time mark and residence time bridge unit, a processor, a local clock unit, and an MAC hardcore. The method is characterized in that the method comprises the following steps: (1), the MAC hardcore receives a synchronization message transmitted by a main clock point in a local PTP domain to a local side, and the PTP time mark unit records a time stamp t2 when the synchronization message reaches a GMII / MII interface, and uploads the time stamp t2 to a processor unit in a local control module.

Description

technical field [0001] The invention relates to an airborne network IEEE1588 protocol transparent clock port synchronization method, which belongs to the field of networked airborne testing. Background technique [0002] In the new generation of networked general-purpose airborne test system, the boundary clock can be used to solve the problem of time synchronization between network devices across network segments, but the boundary clock adopts a step-by-step synchronization method, and the synchronization errors of network devices at all levels will gradually increase. Zooming in, using the IEEE1588 protocol E2E transparent clock can solve this problem; but in the E2E transparent clock, if the local clock that calculates the dwell time of event messages is not synchronized with the master clock in the PTP domain, it will bring errors to the dwell time calculation. The E2E transparent clock in the IEEE1588 protocol is a clock node with switching functions composed of multipl...

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Application Information

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IPC IPC(8): H04L7/00
Inventor 单文军陈怦李文华张乐李飞行
Owner CHINESE FLIGHT TEST ESTAB
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