ONU automatic detection and EPON-and-GPON-adaptation method and device

An automatic detection and adaptation technology, applied in the direction of transmission monitoring/testing/fault measurement systems, etc., can solve problems such as single scope of application, unfavorable use and expansion of communication systems, and difficulty in effectively utilizing resources and layouts, so as to speed up detection. The effect of low occupancy

Active Publication Date: 2013-09-04
FENGHUO COMM SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the scope of application of the existing ONU remote devices is relatively single, which is not only not conducive

Method used

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  • ONU automatic detection and EPON-and-GPON-adaptation method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] Embodiment 1: The method of the present invention is used for the first time to connect an ONU whose current access mode is GPON access mode to an EPON system.

[0091]Power on and start the ONU, read and run the GPON mode, and pre-set the access mode parameter on the ONU as the GPON mode. Detect the state of the optical link, and the LOS signal of the optical link is eliminated during the power-on and start-up process of the ONU. Read the GPON mode, and set the ONU access mode to GPON access mode according to the GPON mode; read the detection duration parameter, and set the detection time to 3000 milliseconds according to the detection duration parameter. Set the framing mode of the MAC layer according to the GPON access mode. The MAC layer works in the downlink 2488Mbps GEM frame mode. The MAC layer working in the GPON mode runs the GPON frame demarcation state machine according to the technical standard of ITU-G.984. Set the synchronization signature string of the f...

Embodiment 2

[0094] Embodiment 2: On the basis of Embodiment 1, the ONU in the EPON access mode is connected to the GPON system.

[0095] Power on and start the ONU, read and run the EPON mode, detect the status of the optical link, and the LOS signal of the optical link is eliminated during the process of powering on the ONU. Read the EPON mode, and set the access mode of the ONU to the EPON access mode according to the EPON mode. According to the EPON access mode, set the framing mode of the MAC layer. The MAC layer works in the downlink 1250Mbps Ethernet frame mode. The MAC layer working in the EPON mode runs the EPON frame delimitation state machine according to the technical standard of IEEE802.3ah. The synchronization signature string of the frame delimitation state machine is a 0x55 string sequence. Read the detection time length parameter after changing in embodiment 1, according to detection time length parameter, detection time is set to 1000 milliseconds, in the detection time ...

Embodiment 3

[0098] Embodiment 3: On the basis of Embodiment 2, the ONU in the GPON access mode is connected to the GPON system.

[0099] Power on the ONU, read and run the GPON mode, detect the status of the optical link, and after the optical fiber is plugged or replaced on the ONU, the LOS signal of the optical link is eliminated. Set the framing mode of the MAC layer according to the GPON access mode. The MAC layer works in the downlink 2488Mbps GEM frame mode. The MAC layer working in the GPON mode runs the GPON frame demarcation state machine according to the technical standard of ITU-G.984. Set the synchronization signature string of the frame delimitation state machine to 0xB6AB31E0. Read the updated detection duration parameter in embodiment 2, according to the detection duration parameter, the detection time is set to 1000 milliseconds; in the detection time range of 1000 milliseconds, the GPON frame demarcation state machine that runs by the MAC layer detects the ONU received W...

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Abstract

The invention discloses an ONU automatic detection and EPON-and-GPON-adaptation method and device, and relates to the technical field of PONs. The method comprises the steps of electrifying to start an ONU, running current access mode parameters of the ONU, judging that LOS signals of an optical link are eliminated, using the ONU to detect downlink optical signals of an OLT, setting a framing mode of a medium access control layer according to a current access mode of the ONU, running a frame delimiting state machine according to the framing mode of the medium access control layer, setting detection duration parameters, setting detection time according to the detection duration parameters, using the frame delimiting state machine to detect whether the downlink optical signals reach a frame synchronous state or not, keeping the current access mode of the ONU if the downlink optical signals reach the frame synchronous state, and replacing the current access mode of the ONU if the downlink optical signals do not reach the frame synchronous state. According to the ONU automatic detection and EPON-and-GPON-adaptation method and device, the access mode of the OLT can be automatically detected and adapted, the application range is wide, convenience is brought to use and dilatation of a communication system, and existing resources and existing layouts can be effectively used.

Description

technical field [0001] The present invention relates to the technical field of PON (Passive Optical Network, passive optical network), in particular to a method and device for automatic detection and adaptation of ONU to EPON and GPON. Background technique [0002] At present, broadband access technology is mainly divided into copper wire access technology and optical access technology; in optical access technology, PON is a passive optical network characterized by point-to-multipoint bidirectional optical fiber transmission. see figure 1 As shown, the PON system includes: OLT (Optical Line Terminal, Optical Line Terminal), ODN (Optical Distribution Network, Optical Distribution Network) and at least two ONUs (Optical Network Unit, Optical Network Unit), between the OLT and each ONU through The ODN transmits uplink data and downlink data. [0003] At present, the main access methods in the broadband access PON technology are generally EPON (Ethernet Passive Optical Network...

Claims

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Application Information

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IPC IPC(8): H04B10/07
Inventor 刘静霞熊晴晴
Owner FENGHUO COMM SCI & TECH CO LTD
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