Optical network data transmission method as well as system and equipment thereof

Abstract

The invention discloses an optical network data transmission method as well as a system and equipment thereof, belonging to the field of optical communication. The method comprises the steps of obtaining the respective first roundtrip delay Rtd value of ONU; obtaining the second roundtrip delay Rtd value of distance measurement ONU; obtaining the change value of the Rtd value according to the first Rtd value and the second Rtd value of the distance measurement ONU; obtaining the second Rtd value of non-distance-measurement ONU according to the change value and the first Rtd value of the non-distance-measurement ONU; and obtaining and transmitting the corresponding isostatic delay EqD value of the ONU according to the obtained respective second Rtd value of the ONU. The system comprises transmission equipment, distance measurement equipment and non-distance-measurement equipment. The equipment comprises an obtaining module, a distance measurement module, a difference value module, a processing module and a transmission module. When the phenomena of main optical fiber faults or main OLT equipment faults, and the like occur in a PON network, main and standby conversion is triggered and performed. The invention only needs to perform distance measurement for one ONU, so the distance measurement time is saved. Especially when a plurality of ONUs exist, the invention can obviously reduce service interruption and meet the requirements of service which is carried by the PON network and has higher time delay requirements.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a method, system and equipment for sending data by an optical network. Background technique [0002] In the current field of optical communication technology, PON (passive optical network, passive optical network) technology is widely used as a point-to-multipoint optical access technology, see figure 1 , the PON network is composed of OLT (Optical Line Terminal; Optical Line Terminal), OS (Optical Splitter, Optical Splitter) and ONU (Optical Network Unit, Optical Network Unit). The OS connects each ONU through a separate branch fiber; among them, in the downlink direction (the transmission direction from the OLT to the ONU, usually using 1490 nm wavelength to carry the service transmission), the OS realizes the optical splitting function, and the downlink light of the OLT is transmitted through the branch fiber The signal is sent to all ONUs; in the upstream direction (the ...

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Problems solved by technology

Capacity expansion is an inevitable trend in the development of PON networks. With the large increase in the number of ONUs connected to the PON, when re-ranging is required during service operation (such as the occurrence of the above-mentioned master-standby switchover), if still Using the re-ranging method provided in the existing standards, for those services that require high service delays, such as TDM (Time Division Multiplex, time division multiplexing) voice services, video services, etc., it will not be able to meet the time delay request

For example, when a service requires that its service interruption time be less than 50ms, if a PON LT is connected to 128 ONUs or more, it will not be able to guarantee the continuity of the service, resulting in service interruption, resulting in poor poor user experience, reducing user satisfaction with the services provided by operators

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