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

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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 ti

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

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Example Embodiment

[0075] Example 1

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

[0077] The present invention defines the intermediate data frame structure as a K-order optical payload tributary unit (OPTUK: Opticalchannel Payload Tributary Unit-K) frame structure. The OPTUK frame structure requires a repetition period of 125 microseconds (the same as the repetition period of the DTM frame structure), that is, the repetition frequency is 8KHz; the OPTUK frame structure rate is the rate of the OPUK payload area of ​​the optical channel payload unit; different K The value corresponds to different nominal rates, for example, the nominal rate of OPTU1 is the rate of STM-16, the nominal rate of OPTU2 is the rate of STM-64, and the nominal 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 sho...

Example Embodiment

[0089] Example 2

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

[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 designated capacity. Various data services, after being processed by the physical layer, and then adapted by GFP or other adaptation protocols, have a rate equal to the specified number of DTM timeslot rates. For example, GE services have a rate of about 1...

Example Embodiment

[0098] Example 3

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

[0100] 1) Adaptation module, in the sending direction, adapt 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 , 140M TDM signal is adapted to the rate indicated 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 extracted from the data stream with the adapted protocol format Signal format.

[0101] 2) OPTUK module, in the sending direction, the adapted signals of all adaptation modules are mapped to the DTM time slot position in the specified OPTUK. The multiplexing of the DTM time slot is by mapping these adapted signals to the specified time. The gap is complete. For exam...

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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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