Ranging method and apparatus, optical line terminal, optical network unit, and storage medium

CN122349073APending Publication Date: 2026-07-07NEW H3C TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NEW H3C TECH CO LTD
Filing Date
2026-06-04
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

In Type B PON networking, the high clock synchronization requirements of primary and backup devices lead to increased equipment costs. Existing ranging methods require re-ranging during primary and backup device switching, which reduces the primary/backup switching rate.

Method used

The master device measures the loop delay from the ONU device to itself and sends it to the backup device. The backup device calculates the delay difference to obtain the loop delay from the ONU device to itself, reducing the requirement for clock synchronization and enabling fast distance measurement.

Benefits of technology

Without requiring clock synchronization between primary and backup devices, loop delay measurement from ONU device to backup device was achieved, reducing equipment hardware costs and improving primary/backup switchover rate.

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Abstract

The embodiment of the application provides a ranging method and device, an optical line terminal, an optical network unit and a storage medium, relates to the technical field of passive optical networks, and in the scheme, a PON networking of Type B comprises a first OLT device and a second OLT device, which are respectively a master device and a backup device in a fiber backup group. The first OLT device measures a first loop delay from a first ONU device to the first OLT device, and sends the first loop delay to the second OLT device. The second OLT device measures a second loop delay from the first ONU device to the second OLT device, and calculates a delay difference between the second loop delay and the first loop delay. The first OLT device measures a third loop delay from a second ONU device to the first OLT device, and sends the third loop delay to the second OLT device. The second OLT device calculates a sum of the third loop delay and the delay difference, and obtains a fourth loop delay from the second ONU device to the second OLT device. The scheme can realize ranging while reducing the cost of devices.
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