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Mapping method and device of optical channel data unit

A data unit and mapping method technology, applied in the field of communication transmission, can solve the problems of increasing data transmission overhead, reducing data transmission rate and efficiency, and different effects, so as to improve data transmission efficiency and speed, speed up commercial applications, and protect existing Have the effect of investing

Active Publication Date: 2010-12-29
ZTE CORP
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Problems solved by technology

However, after ODUk data is mapped to TFI-5 data, since ODUk data and TFI-5 data are different in frame format, data width, rate, etc., their effects during data transmission are also different. For example, when ODUk data is mapped to TFI-5 data, the rate adjustment byte is added in the frame format of the data, thus increasing the overhead of data transmission and reducing the rate and efficiency of data transmission
Therefore, in the process of transmission, it is necessary to map TFI-5 data back to ODUk data to realize the conversion from TFI-5 to OTN. However, there is currently no effective mapping method from TFI-5 data to ODUk data

Method used

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  • Mapping method and device of optical channel data unit

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Embodiment Construction

[0020] The basic idea of ​​the present invention is: by performing frame alignment on TFI-5 data, deleting the rate adjustment byte in TFI-5 data, and converting the clock signal frequency of TFI-5 to the clock signal frequency of ODUk and the width conversion of data A series of operations, etc., realize the mapping from TFI-5 data to ODUk data.

[0021]It should be noted that in the G.709 standard formulated by the Telecommunication Standardization Department (ITU-T), three different rate levels of ODUk are specified, where k=1, 2, and 3 correspond to approximately 2498775.126 kbit / s, 10037273.924 kbit / s, 40319218.983kbit / s rate. Moreover, in order to make full use of the bandwidth of ODU1, the present invention also defines a rate level ODU0 when k=0, and this ODU0 corresponds to a rate of about 1249387.563 kbit / s. Here, when mapping ODUk data to TFI-5 data, in order to adjust the rate between TFI-5 data and ODUk data, a frame format is customized, including: overhead byte...

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Abstract

The invention discloses a mapping method of an optical channel data unit ODUk, which comprises the following steps: inputting TFI-5 data of a time-division multiplexing structure interface, and positioning the boundary position of rate adjustment bytes which need to be deleted; deleting the rate adjustment bytes in the TFI-5 data according to the positioned boundary position; and converting the clock signal frequency of data which does not contain the rate adjustment bytes onto a clock domain located by ODUk data and converting the width of the data to the width of the ODUk data. Correspondingly, the invention further discloses an ODUk mapping device which comprises a data input unit, a frame positioning unit, a first-in first-out (FIFO) unit and a data assembly unit. Therefore, the mapping method and the device can realize the mapping of the TFI-5 data to the ODUk data and further lead the ODUk data on different single boards to be exchanged.

Description

technical field [0001] The present invention relates to communication transmission technology, in particular to a mapping method and device for Optical Channel Data Unit (ODUk, Optical Channel Data Unit-k). Background technique [0002] The development of optical communication technology has realized the transition from Synchronous Digital Hierarchy (SDH) to Dense Wavelength Division Multiplexing (DWDM, Dense Wavelength Division Multiplexing). In the past, SDH was the transmission backbone network. With the emergence and development of DWDM technology, DWDM has replaced SDH as the transmission backbone network, while SDH has become the access network. Then, the emergence and development of Optical Transport Network (OTN, Optical Transport Network) technology has promoted the progress of the transmission backbone network. OTN is based on wavelength division multiplexing technology, provides fast protection and recovery functions on the optical layer, and It provides a solid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q11/00H04J14/02
Inventor 钟长龙
Owner ZTE CORP
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