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GPON system and protection switching method for realizing fast protection switching

A protection switching and fast technology, applied in the field of optical access network, can solve problems such as business data loss

Active Publication Date: 2020-07-07
FENGHUO COMM SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Traditionally, when a switching event occurs, the ONU needs to re-register and configure, that is, when the OLT finds that the ONU is in the POPUP state (O6), it will stop allocating bandwidth to the ONU and send a Broadcast POPUP (broadcast POPUP) message to the ONU , when the ONU receives the message and enters the ranging state (O4), after the OLT sends the Ranging-request (ranging request) message, the ONU delays the pre-equalization delay, and sends a ranging response message, and the OLT receives the ONU response After the message, the Ranging-time (ranging time) message is sent, and then the ONU receives the Ranging-time (ranging time) message, and enters the running state (O5) after processing. After the channel is re-created, the ONU business can resume, and the PON switching time Reaching about 50ms ~ 150ms may cause short interruption of business and loss of some data

Method used

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  • GPON system and protection switching method for realizing fast protection switching
  • GPON system and protection switching method for realizing fast protection switching
  • GPON system and protection switching method for realizing fast protection switching

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Embodiment 1 of the present invention provides a GPON system that realizes fast protection switching, including OLT and ONU, ONU negotiates with OLT, and adds a custom PLOAM extension message: RANGING_TIME_DELTA; when ONU is registered, in the POPUP (O6) of the GPON system state machine Register the interrupt handler function of custom PLOAM extended message RANGING_TIME_DELTA in the state.

[0044] The PLOAM message is a general term for a class of physical layer operation management and maintenance messages defined in the GPON technical specification. The RANGING_TIME_DELTA message is not the PLOAM message defined in the GPON specification, but a custom message. It is encapsulated in the standard PLOAM message format, which can be said to be Extended message in PLOAM message.

[0045] The custom PLOAM extended message is used to notify the ONU to switch the state machine when PON protection switching occurs, and the realization of the custom PLOAM extended message is ...

Embodiment 2

[0061] Before and after fast PON switching is successful, the processing sequence of the GPON system state machine and custom PLOAM extension messages is as follows:

[0062] O5->LOF Alarm->O6->LOF CLEAR->RANGING_TIME_DELTA->O5

[0063] That is: running status -> frame loss -> POPUP status -> frame loss flag clear -> received custom PLOAM extension message -> running status

[0064] Logs during fast PON switching are as follows:

[0065] [gpon_stack.c 3652] [Pon(455)]_Gpon LCDG or LOF state change interrupt isr=0x00000010, ier=0x00000090

[0066] [gpon_stack.c 14546] [Pon(455)]_Activation state machine:Invoke:state=OPERATION(O5), event=DETECT_DS_LOS_OR_LOF

[0067] [gpon_stack.c 9115][Pon(455)]_OAM indication arrived

[0068] [gpon_stack.c 9104][Pon(455)]_State transition indication arrived

[0069] [gpon_stack.c 9109][Pon(455)]_Link Operation state transition indication arrived

[0070] [gpon_stack.c 3652] [Pon(455)]_Gpon LCDG or LOF state change interrupt isr=0x00000010...

Embodiment 3

[0084] Embodiment 1 can shorten the type b protection switching time to 1 ms, but because data cannot be sent for a short period of time during the type b switching process, data is lost.

[0085] It can be further optimized on the basis of Embodiment 1: in the process of PON switching, when the data cannot be sent, the PON chip cache of the ONU and OLT can be set to cache the sent data, and after recovering the sent data, the cache The data is sent out to minimize data packet loss.

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Abstract

The invention discloses a GPON system for realizing rapid protection switching and a protection switching method and relates to the light access network field. The method comprises the following stepsthat an ONU negotiates with an OLT so as to add a customized PLOAM expansion message; the OLT records an EQD which normally registers the ONU; when switching is generated, an OLT PON port in a working mode detects an LOS and is switched to a standby mode, and a CPLD triggers the OLT PON port to be switched to the working mode, and broadcasts the customized PLOAM expansion message to all the ONUsunder the PON port; and the ONU detects a LOF, enters into a POPUP state from an operation state, and eliminates an LOF interruption, at this time, the ONU receives the customized PLOAM expansion message and generates an interruption, and the ONU sets the EQD of the ONU according to the EQD in the customized PLOAM expansion message sent by the OLT, sets a GPON system state machine to the operationstate, and reports the state. In the invention, PON protection switching time can be reduced to 1ms.

Description

technical field [0001] The invention relates to the field of optical access networks, in particular to a GPON system and a protection switching method for realizing fast protection switching. Background technique [0002] With the rise of the Internet, especially the development of multimedia services, the network has become an important part of people's lives. With the continuous emergence of high-bandwidth services such as online games, high-definition television (HDTV) and interactive Internet television (IPTV), users The demand for access bandwidth is constantly increasing. Fiber-based access PON (Passive Optical Network, Passive Optical Network) has become a leader in optical access technology due to its advantages of easy maintenance, high bandwidth, and low cost. With the increase of broadband access network services, Especially for some important customers' networking needs, it is very important to protect the PON system. [0003] However, with the application of a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/032H04Q11/00
CPCH04B10/032H04Q11/0062H04Q11/0067H04Q2011/0081
Inventor 高超屈兰
Owner FENGHUO COMM SCI & TECH CO LTD
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