Wavelength tuning method and system for passive optical network, and ONU

Abstract

The invention discloses a wavelength tuning method and system for a passive optical network, and an ONU. The method comprises the steps: detecting whether the ONU is in a Pending state or not before the ONU enters an Intermittent LODS state when the ONU (optical network unit) is in the Intermittent LODS state and the synchronization of current downlink channels is recovered before a constraint timer exceeds the time in the state; detecting whether the ONU can return to the Pending state before a specified moment SFC or not if the ONU is in the Pending state; enabling the state of the ONU to be switched to the Pending state from the Intermittent LODS state if the ONU can return to the Pending state. According to the invention, the method solves a problem that the ONU and S-CT are out of synchronization, a problem of intercommunication of S-CT and T-CT and a problem that the business of the ONU cannot be recovered quickly. The method can enable the business of the ONU to be recovered quickly, and irons out the defects and gaps of the prior art.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a wavelength tuning method, system and ONU of a passive optical network. Background technique [0002] At present, the deployment and application of passive optical network (PON) technology in the existing network has achieved a symmetrical 10Gbit / s bandwidth of optical line terminal OLT equipment on a single channel wavelength. Limited by the cost and maturity of optical devices with a rate exceeding 10Gbit / s, the idea of ​​PON technology development and evolution is to improve the bandwidth capability of the overall OLT equipment system by stacking multiple wavelengths, which is called time-division wavelength division passive in the industry. Optical network TWDM-PON. Currently, ITU is in the process of formulating standards, and its standard series is ITU-T G.989.x. In TWDM-PON, the OLT device provides multiple wavelength channels for transmitting data and control inf...

AI Technical Summary

Problems solved by technology

There is a problem or defect in the wavelength tuning mechanism in the current standard G.989.3: when the ONU device is in the O5.1 state (Associated), it enters the O5.2 state (Pending) after receiving and confirming the wavelength tuning (Tuningrequest), It will wait for the arrival of the specified time (SFC) and then migrate to the O8 state, and then start to adjust the downlink wavelength

However, if the ONU device encounters a downlink out-of-synchronization event (LODS) in the O5.2 state and recovers before the time specified by the SFC, the behavior of the ONU device in the wavelength tuning mechanism is not specified, and the source channel terminal of the OLT device The Inter-Tunnel Terminal Protocol (ICTP) procedure between (S-CT) and Target Tunnel Terminal (T-CT) is also not described

When the above situation occurs, the state information between the ONU device and the S-CT will be out of sync for a period of time, which will lead to abnormal suppression of the ONU device alarm, S-CT and T-CT cannot return to normal status, and ONU device business Unable to recover in time, longer outage

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