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Method and apparatus for mapping DTM to OTN

A rate and dynamic technology, applied in the field of optical transport network, can solve the problems of not being able to utilize the advantages of DTM optical fiber bandwidth, low bandwidth utilization, and inability to DTM mapping, etc., to achieve strong business adaptability, high QOS real-time transmission, and line bandwidth Effect of Utilization Ratio Improvement

Inactive Publication Date: 2007-09-05
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0027] 1) The bandwidth utilization rate is not high; if DTM needs to be transmitted over OTN, it needs to be realized through DTM OVER SDH and then OVER OTN, so the overhead occupied by each layer is relatively large;
[0028] 2) There is one more SDH layer, so the design is more complicated and the hardware cost is high;
[0029] 3) Cannot take advantage of DTM's ability to utilize the fiber bandwidth to the maximum
[0030] Since the DTM frame structure is a frame structure with a period of 125 microseconds, the number of time slots is related to the line rate; while the OTN frame structure, such as ODUK is a 3824×4 modular frame structure, which has nothing to do with the line rate Modular frame structure, and the periods of different levels of ODUK are different. For example, the frame period of ODU1 is more than 4 times longer than that of ODU2, but the structure is still 3824×4 bytes; therefore, the time slot of DTM cannot be directly mapped In the time slot or byte of ODUK, the technology of DTM OVER to SDH cannot be borrowed on OTN

Method used

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  • Method and apparatus for mapping DTM to OTN
  • Method and apparatus for mapping DTM to OTN
  • Method and apparatus for mapping DTM to OTN

Examples

Experimental program
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Embodiment 1

[0076] First, the method for mapping the DTM to the OTN of the present invention is described through this embodiment.

[0077] The present invention defines the intermediate data frame structure as an Optical Channel Payload Tributary Unit-K (OPTUK: Optical Channel Payload Tributary Unit-K) frame structure. Described OPTUK frame structure needs repetition period to be 125 microseconds (repetition period with DTM frame structure), that is to say repetition frequency is 8KHz; Described OPTUK frame structure rate is optical channel payload unit OPUK payload area rate; Different K The values ​​correspond to different nominal rates. For example, the nominal rate of OPTU1 is the rate of STM-16, the rate of OPTU2 is the rate of STM-64, and the rate of OPTU3 is the rate of STM-256.

[0078] FIG. 6 is a frame structure diagram of one line of OPTUK in this embodiment; FIG. 7 is a modular structure of OPTU1 of the present invention. As shown in the figure, the OPTUk data frame structur...

Embodiment 2

[0090] FIG. 8 is a schematic structural diagram of a multiplexing converter (TMUX) implementing DTM mapping to OTN in this embodiment. This is a DTM TMUX structure that can realize full service transparency, whether it is data service, video service or traditional TDM service, it can realize transparent transmission. For data services, both MAC transparency and bit transparency can be realized. As shown in FIG. 8, the TMUX includes: an adaptation module, an OPTUK module and an OTN line processing module. in,

[0091] The adaptation module is used to complete the physical layer processing of the client signal in the sending direction, and adapt the client signal to the DTM time slot rate of the specified capacity. After various data services are processed by the physical layer and then adapted by GFP or other adaptation protocols, their rate is equal to the specified number of DTM time slot rates. For example, the rate of GE services is about 1G after GFP adaptation, and 2000...

Embodiment 3

[0099] Fig. 9 is an OXC device with built-in DTM scheduling of the present invention. As shown in Figure 9, the OXC equipment includes:

[0100] 1) The adaptation module, in the sending direction, adapts each client signal to the rate level of the specified DTM time slot group through the adaptation protocol, for example, the GE signal is adapted to the rate represented by 2000 DTM time slots through the GFP protocol , the 140M TDM signal is adapted to the rate represented by 300 DTM time slots by bit or byte stuffing; in the receiving direction, the de-adaptation process is completed, and the original client is decomposed from the data stream with the adapted protocol format signal format.

[0101] 2) The OPTUK module, in the sending direction, completes the mapping of the adapted signals of all the adaptation modules to the specified DTM time slot position in the OPTUK, and the multiplexing of the DTM time slot is by mapping these adapted signals to the specified time slot ...

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Abstract

The method comprises: a) constructing a meta-data frame structure whose repeating cycle is 125 microseconds and whose rate is the payload area rate of optical channel payload unit (OPUK); b) dividing out a dynamical transmission mode (DTM) time slots from the meta-data frame structure; according to the signal rate of user, allocating the numbers of DTM time slots; adapting the users' signals to the allocated DTM time slots, and mapping them into relevant time slot position; e) transparently mapping the meta-data frame structure into the OPUK of optical transmission network (OTN).

Description

technical field [0001] The present invention relates to optical transport network technology, in particular, relates to a method and device for mapping DTM to OTN. Background technique [0002] Next-generation networks require high-efficiency transmission and performance monitoring capabilities, as well as the highest availability and survivability. Although SONET / SDH (Synchronous Optical Network / Synchronous Digital System) can exert considerable advantages in services based on time division multiplexing (TDM) and play an important role in metropolitan area networks, there are many limitations of SONET / SDH , with the continuous growth of Internet and data traffic, it is difficult for SONET / SDH to meet the requirements of the current metropolitan optical transport network. A new network solution is required to meet the scalability and manageability requirements of the network. Optical Transport Network (OTN: Optical Transmission Net) based on ITU-T (International Telecommun...

Claims

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Application Information

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IPC IPC(8): H04J3/16H04J14/00H04B10/27H04B10/29H04B10/291H04J3/00H04J14/02
CPCH04J3/1611
Inventor 邹世敏
Owner HUAWEI TECH CO LTD
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