A time synchronization method and device for an optical transport network asynchronous network

An asynchronous network and optical transport network technology, applied in the field of communication, can solve the problems of incompatibility of OSC, inability to realize time and synchronization through transformation, and achieve the effect of realizing time
CN103684727BActive Publication Date: 2018-03-23ZTE CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZTE CORP
Publication Date
2018-03-23

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Abstract

The invention discloses a time synchronization method and device for an asynchronous network of an optical transmission network. When a station in the optical transmission network receives a time message transmitted by other stations, the first line card in the station recovers one or more clocks The clock frequency of the optical channel data unit (ODUm), where m is a positive integer less than or equal to k, k is the order of the optical channel data unit, k=1, 2, 3, 4, and the service of the first line card uses the local clock Convert to the data frame format of the backplane, and send the clock ODUm to the second line card in the site through the cross-connect board; the second line card uses the local clock to receive the backplane data frame, recovers the clock frequency of the clock ODUm, and uses the optical path transmission unit (OTUn) The local clock or service recovery clock of the optical port sends the entire OTUn, where n is the order of the optical channel transmission unit. The present invention can support high-precision time synchronization under the asynchronous condition of the existing network OTN.
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Description

technical field

[0001] The invention relates to a time synchronization technology in the communication field, in particular to a time synchronization method and device for an asynchronous network of an optical transport network. Background technique

[0002] With the development of packet services, PTN (Packet Transport Network, Packet Transport Network) is rising day by day. It is not only suitable for multi-service bearer, but also can provide clock synchronization (synchronous Ethernet) and 1588 time synchronization functions, which can be very good Supports mobile backhaul features. However, if the services converged by the PTN equipment are transmitted through the existing OTN (Optical Transport Network, Optical Transport Network), it is necessary to consider the bearer mode of the OTN for time synchronization.

[0003] At present, OTN mainly supports the time transfer of PTN in the following three ways:

[0004] 1. The client signal transmits the 1588 protocol on the...

Claims

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