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Method and device for transmitting time information

A time information and time technology, applied in synchronization devices, transmission systems, digital transmission systems, etc., can solve the problems of occupying OTN overhead, unable to complete the mapping of time data, limited bytes, etc., to ensure services, easy to deploy and The effect of upgrading equipment

Active Publication Date: 2011-05-04
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second type requires time-synchronized data mapping and occupies OTN overhead
Due to the limited OTN overhead bytes, complete mapping with time data cannot be achieved
And this method still needs to deal with the business

Method used

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  • Method and device for transmitting time information
  • Method and device for transmitting time information
  • Method and device for transmitting time information

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] This embodiment mainly describes reading the synchronized time from the main optical path sent by the superior node, and putting the time into the downlink optical path of the current node. Such as figure 2 shown, including the following steps:

[0055] Extract the data stream of the optical monitoring channel from the main optical path;

[0056] Extract time data from the data stream of the optical monitoring channel;

[0057] processing the time data according to the clock mode adopted by the current node to generate time information;

[0058] inserting the time information into the data stream of the optical monitoring channel, and merging the optical monitoring channel into the main optical path.

[0059] The clock mode refers to the mode stipulated in the IEEE1588 protocol. In this embodiment, the clock mode adopted by the current node includes a boundary clock (Boundary Clock, BC for short) mode and a transparent clock (Transparent Clock, TC for short) mode. ...

Embodiment 2

[0069] This embodiment mainly describes reading the synchronized time from the data stream of the optical monitoring channel of the main optical path, but does not put the time into the downlink optical path of the node, but provides the time to the external interface for use. Such as Figure 4 shown, including the following steps:

[0070] Extract the data stream of the optical monitoring channel from the main optical path;

[0071] Extract time data from the data stream of the optical monitoring channel;

[0072] synchronizing the time of the current node according to the time data, and processing the time data according to the clock mode adopted by the current node to generate time information;

[0073] Send the time information to the external interface device.

[0074] In this embodiment, the external interface device is a time application unit, that is, a unit that uses synchronized time, such as a 3G base station. The clock mode of the current node is determined acc...

Embodiment 3

[0081] This embodiment mainly describes reading synchronized time data from an external interface, and putting the time into the downlink optical path of the current node. Such as Figure 6 shown, including the following steps:

[0082] Extract the data stream of the optical monitoring channel from the main optical path;

[0083] Acquiring time data from an external interface device, synchronizing the time of the current node according to the time data, processing the time data according to the clock mode adopted by the current node to generate time information;

[0084] inserting the time information into the data stream of the optical monitoring channel, and merging the optical monitoring channel into the main optical path.

[0085] In this embodiment, the time on the external interface device is the synchronized absolute time. The external interface device may be an external time source unit such as a time server, or a time application unit such as a 3G base station.

...

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Abstract

The invention discloses a method and a device for transmitting time information, which is easy to realize, and avoids unnecessary alteration of services. The method comprises the following steps: extracting a data stream of a light monitoring channel from a main light path; extracting time data from the data stream of the light monitoring channel; processing the time information generated by the time data according to a clock mode used by the current node; and interpolating the time information to the data stream of the light monitoring channel, and merging the light monitoring channel into the main light path.

Description

technical field [0001] The present invention relates to the field of WDM (Wavelength division multiplexing, wavelength division multiplexing) / OTN (Optical Transport Network, optical transport network) equipment, in particular to a method and device for transmitting time information. Background technique [0002] With the development of communication technology, there is an increasingly strong demand for communication networks to transmit accurate time information, that is, time synchronization. Accurate time information can be used in fields such as 3G network synchronization. Therefore, as important components of the bearer network, time synchronization functions must also be provided for bearer network equipment, especially for wavelength division multiplexing, that is, WDM equipment, and optical transport network, that is, OTN equipment. [0003] In order to realize accurate time synchronization in WDM / OTN equipment, generally adopt IEEE 1588 agreement. It specifies t...

Claims

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Application Information

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IPC IPC(8): H04L7/00H04B10/08
Inventor 代航
Owner ZTE CORP
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