GPON system for realizing rapid protection switching and protection switching method

A protection switching and fast technology, applied in the field of optical access network, can solve problems such as business data loss, achieve the effect of taking into account cost, increasing PON chip cache, and reducing protection switching time

Active Publication Date: 2018-10-09
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 for realizing rapid protection switching and protection switching method
  • GPON system for realizing rapid protection switching and protection switching method
  • GPON system for realizing rapid protection switching and protection switching method

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Experimental program
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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 custom PLOAM extension message: RANGING_TIME_DELTA; when ONU is registered, POPUP (O6) in GPON system state machine Register the interrupt handling function of the custom PLOAM extended message RANGING_TIME_DELTA in the state.

[0044] The PLOAM message is a general term for a type of physical layer operation management and maintenance messages defined in the GPON technical specification. The RANGING_TIME_DELTA message is not a PLOAM message defined in the GPON specification, but a custom message, which is encapsulated in the standard PLOAM message format. The extended message in the PLOAM message.

[0045] The custom PLOAM extension message is used to notify the ONU to switch the state machine when a PON protection switch occurs. Realizing the custom PLOAM extension message is the key to the ONU side to cooperate to ac...

Embodiment 2

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

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

[0063] Namely: running status -> Frame loss -> POPUP status -> Frame loss flag clear -> Receive customized PLOAM extended message -> Operating status

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

[0065] [gpon_stack.c 3652][Pon(455)]_Gpon LCDG or LOF state change interruptisr=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 transitionindication arrived

[0070] [gpon_stack.c 3652][Pon(455)]_Gpon LCDG or LOF state change interruptisr=0x00000010,ier=0x00000090

[0...

Embodiment 3

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

[0085] It can be further optimized on the basis of embodiment 1: When data cannot be sent during the PON switching process, the PON chip buffer of ONU and OLT can be set to buffer the sent data. After the data is restored, the buffer can be buffered. 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 for realizing rapid protection switching and a protection switching method. 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 continues to increase. Fiber-based access PON (Passive Optical Network) has become a leader in optical access technology due to its easy maintenance, high bandwidth, and low cost. With the increase of broadband access network services, Especially the needs of some important customers' networking, the protection of the PON system is very important. [0003] However, with the application of a large number of operators in the PON sys...

Claims

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Application Information

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Patent Type & Authority Applications(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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