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Optical transmission system and station-side equipment in the optical transmission system

A technology of optical transmission and equipment, which is applied in the field of station-side equipment, can solve the problems of unreachable, low utilization efficiency, and degradation of PON control circuit utilization efficiency, and achieve the effect of eliminating power waste and improving utilization efficiency

Active Publication Date: 2021-01-08
NIPPON TELEGRAPH & TELEPHONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, in an actual multi-port PON system, the number of ONUs to be accommodated or the number of LLIDs per PON port can hardly reach the limit value of this number (M)
Therefore, there are unused resources, deteriorating the usage efficiency of the PON control circuit
In addition, the use of low-efficiency PON control circuits is wasteful in terms of power

Method used

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  • Optical transmission system and station-side equipment in the optical transmission system
  • Optical transmission system and station-side equipment in the optical transmission system
  • Optical transmission system and station-side equipment in the optical transmission system

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0058] In the OLT 1A according to the first embodiment, the upstream distribution circuit 14A receives input via the frame reproduction circuits 12-1 to 12-N obtained by aggregating upstream frames (upstream control frames+upstream data frames) from all the ONUs 3 superimposed frame 101, and each upstream control frame 102 collected in the superimposed frame 101 is assigned to a predetermined PON control circuit 13 based on the PON port number added to the frame.

[0059] The PON port number has a value of 1 to N predetermined for each ONU, and can be generated by substituting the individual identification number of the ONU in the frame or the like. The downstream distribution circuit 15 distributes the downstream control frame 103 output from the PON control circuit 13 to which the upstream control frame 102 has been distributed, to the preset predetermined frame reproduction circuit 12 .

[0060] image 3 An example of the upstream distribution circuit 14A is shown. The up...

no. 2 example

[0082] Next, an OLT 1B according to a second embodiment will be described. The OLT 1A according to the first embodiment has an arrangement in which upstream control frames 102 are allocated based on PON port numbers, and all upstream control frames 102 added with the same PON port number are processed by the same PON control circuit 13 . Therefore if the number of upstream control frames 102 added with the same PON port number is close to the maximum number of frames that can be processed in the PON control circuit 13, it is difficult for the same PON control circuit 13 to process the upstream control frame 102 with another PON port number, And the use efficiency of the PON control circuit 13 is reduced.

[0083] In the OLT 1B according to the second embodiment, an upstream distribution circuit 14B having an arrangement in which the distribution destination of the upstream control frame 102 is determined for each LLID is used as the upstream distribution circuit 14 . Uplink c...

no. 3 example

[0106] Figure 8 The basic arrangement of the OLT 1 ​​(1C) according to the third embodiment is shown. In the OLT 1 ​​(1A and 1B) according to the first and second embodiments, only components related to control frame processing are shown. However, in the OLT 1C according to the third embodiment, components related to data frame processing are also shown.

[0107] It should be noted that in the OLT 1C according to the third embodiment, the upstream distribution circuit 21 corresponds to the upstream distribution circuit 14 according to the first and second embodiments, and the downstream distribution circuit 22 corresponds to the downstream distribution circuit 15 . The control frame processing circuits 23 (23-1 to 23-N) correspond to the control frame processing circuits 131 (131-1 to 13-N) in the PON control circuits 13 (13-1 to 13-N) according to the first and second embodiments. 131-N). In addition, an external network 4 is connected to the OLT 1C as a host device. The...

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Abstract

An upstream distribution circuit (14) and a downstream distribution circuit (15) are provided in the OLT (1). For example, a superimposed frame obtained by gathering upstream frames (uplink control frame+uplink data frame) from all ONUs is input to the upstream distribution circuit (14) via the frame reproduction circuit (12-1). The superimposed frame can be generated at the optical signal level, or after converting the optical signal to an electrical signal. The upstream distribution circuit (14) distributes each of the upstream control frames assembled in the superimposed frame to a predetermined PON control circuit (13) based on the information (PON port number or LLID) added to the frame. The downlink distribution circuit (15) distributes each downlink control frame output from the PON control circuit (13) to a preset frame reproduction circuit (12).

Description

technical field [0001] The present invention relates to a station-side device (OLT: Optical Line Terminal) in an optical transmission system between a host device and a plurality of user-side devices connected via an optical transmission channel (PON: Passive Optical Network) transfers frames between, and more specifically, relates to an OLT capable of efficiently communicating with multiple ONUs and optical transport systems. Background technique [0002] Figure 27 An example of such an optical transmission system (PON system) is shown. exist Figure 27 402 represents an optical splitter; 403 represents an ONU (user side device); 404 represents an external network (host device); 405 represents between each ONU 403 and the optical splitter 402 placed optical fiber; 406 indicates an optical fiber placed between the optical splitter 402 and the OLT 401; and 407 indicates an optical transmission channel (PON section) between the OLT 401 and the ONU 403. The OLT 401 transmits...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/44
CPCH04L12/44H04B10/60H04B10/50H04B10/40H04L47/788H04Q11/0067H04Q2011/0086
Inventor 八田彩希川村智明川合健治田中伸幸重松智志池田奈美子大辉晶子加藤顺一
Owner NIPPON TELEGRAPH & TELEPHONE CORP
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