CN104779994B - The guard method of ethernet passive optical network and device - Google Patents
The guard method of ethernet passive optical network and device Download PDFInfo
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Abstract
The present invention is suitable for technical field of access networks, provides a kind of guard method of ethernet passive optical network, including：The optical power of optical signal in first interface is detected, the first interface is the interface currently connecting with optical line terminal OLT；If the optical power of the optical signal is fallen in except preset range, second interface is switched to from the first interface, is connect by the second interface with the OLT；It is communicated by the second interface with the OLT.In the present invention, it include first interface and second interface in ONU, it is connect by first interface with OLT, carry out the optical signal communications of uplink and downlink, the optical power of optical signal switches to second interface from first interface if the optical power of optical signal is fallen in except preset range in detection first interface, the optical signal communications that uplink and downlink are carried out by second interface and OLT, improve EPON network and the reliability communicated when optical power exception occur.
Description
Technical field
The invention belongs to the guard method of technical field of access networks more particularly to a kind of ethernet passive optical network and devices.
Background technique
Ethernet passive optical network（Ethernet Passive Optical Network, EPON）It is a kind of intelligent acess skill
Art, using point-to-multipoint structure, as shown in Figure 1, the equipment optical line terminal of local side（Optical Line Terminal,
OLT）With the equipment optical network unit of several user sides（Optical Network Unit, ONU）Between using optical fiber connect,
Service is provided for ONU, has an interface to connect on each ONU with OLT, which is known as PON mouthfuls, if can connect under each ONU
Dry domestic user terminal.
EPON point-to-multipoint tactic pattern can adapt to the complicated route of layout, make it suitable for applying in power distribution network
In automated communication system, it is responsible for processing, transmission and the return of information.Currently, EPON technical application is distribution network automated logical
When letter system, unprotect list chain structure as shown in Figure 1 occurs light when communicating with OLT if there is the PON mouth in ONU
Power is excessively high or too low, and during system starting, will lead to ONU can not register on OLT；In the process of system operation
In, will lead to ONU can not identify that the downlink data of OLT transmission and OLT can not identify the upstream data that ONU is sent, to lead
The communication disruption of all domestic user terminals of the ONU or less is caused, communication reliability is poor.
Summary of the invention
The purpose of the present invention is to provide a kind of guard methods of ethernet passive optical network, it is intended to solve existing EPON net
There is the problem that communication reliability is poor when optical power exception for PON mouthfuls in network.
The invention is realized in this way a kind of guard method of ethernet passive optical network, including：
The optical power of optical signal in first interface is detected, the first interface is currently to connect with optical line terminal OLT
Interface；
If the optical power of the optical signal is fallen in except preset range, second interface is switched to from the first interface,
It is connect by the second interface with the OLT；
It is communicated by the second interface with the OLT.
Another object of the present invention is to provide a kind of protective devices of ethernet passive optical network, including：
Detection unit, detects the optical power of optical signal in first interface, and the first interface is currently and optical line terminal
The interface of OLT connection；
Switch unit is cut if the optical power for the optical signal is fallen in except preset range from the first interface
Second interface is shifted to, is connect by the second interface with the OLT；
Communication unit, for being communicated by the second interface with the OLT.
In the present invention, include first interface and second interface in ONU, connect by first interface with OLT, carry out uplink
With the optical signal communications of downlink, the optical power of optical signal in first interface is detected, if the optical power of optical signal falls in default model
Except enclosing, second interface is switched to from first interface, the optical signal communications of uplink and downlink are carried out by second interface and OLT,
It improves EPON network and the reliability communicated when optical power exception occurs.
Detailed description of the invention
Fig. 1 is the EPON structural topology figure that the prior art provides；
Fig. 2 is EPON structural topology figure provided in an embodiment of the present invention；
Fig. 3 is the implementation flow chart of the guard method of ethernet passive optical network provided in an embodiment of the present invention；
Fig. 4 is the specific of reparation optical power exception in the guard method of ethernet passive optical network provided in an embodiment of the present invention
Implementation flow chart；
Fig. 5 is the structural block diagram of the protective device of ethernet passive optical network provided in an embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
In embodiments of the present invention, include first interface and second interface in ONU, connect by first interface with OLT, into
The optical signal communications of row uplink and downlink detect the optical power of optical signal in first interface, if the optical power of optical signal is fallen in
Except preset range, second interface is switched to from first interface, the optical signal of uplink and downlink is carried out by second interface and OLT
Communication, improves EPON network and the reliability communicated when optical power exception occurs.
Fig. 2 shows EPON structural topology figures provided in an embodiment of the present invention to illustrate only and this reality for ease of description
Apply the relevant part of example.
It is connected on two PON mouths of ONU22 referring to Fig. 2, OLT21 by optical fiber, it is home-use to connect several under ONU22
Family terminal（It is not shown herein）, OLT21 and ONU22 carry out two-way communication.The electric signal of preceding end switch is converted into light by OLT21
Signal is realized to functions such as the controls, management and ranging of ONU22；ONU22 selection receives broadcast data, the response that OLT is sent
The order such as the ranging of OLT and power control carries out caching to the data of its lower domestic user terminal and when OLT21 is distributed
Between the data of domestic user terminal are sent in window to OLT21.In the communication process with OLT21, at one PON mouthfuls of ONU22
In working condition, another PON mouthfuls is in stand-by state, and two PON mouthfuls of structure and function is identical, when in running order
When the optical power of optical signal occurs abnormal in PON mouthfuls, start the PON mouth under stand-by state, it is switched to working condition, with
OLT21 is communicated, and at the same time, can repair the PON mouth of failure, and not will lead to communication disruption.
Fig. 3 shows the implementation process of the guard method of ethernet passive optical network provided in an embodiment of the present invention, is described in detail such as
Under：
In step S301, the optical power of optical signal in first interface is detected, the first interface is currently and optical link
The interface of terminal OLT connection.
In embodiments of the present invention, first interface is one of PON mouthfuls of ONU, is connect with OLT, and work shape is in
State.Uplink and downlink optical signal between OLT and ONU is both needed to by first interface.
As an embodiment of the present invention, step S301 is specially：Detect the light of the uplink optical signal in first interface
Power, the uplink optical signal are sent to OLT by the first interface；And the light of the downlink optical signal in detection first interface
Power, the downlink optical signal are sent to the first interface by the OLT.
Up direction is the direction ONU to OLT, and down direction is the direction OLT to ONU.In embodiments of the present invention, it detects simultaneously
Up direction 1310nm optical signal and down direction 1490nm optical signal are listened, its optical power is obtained.
In step s 302, it if the optical power of the optical signal is fallen in except preset range, is cut from the first interface
Second interface is shifted to, is connect by the second interface with the OLT.
In embodiments of the present invention, second interface is one of PON mouthfuls of ONU, structure and function and first interface
It is identical, it is in stand-by state.When the optical power of optical signal in first interface occurs abnormal, second is switched to from first interface and is connect
Mouthful, so that second interface is in running order.Optical power refers to that optical power is excessively high or too low extremely.
As an embodiment of the present invention, step S302 is specially：If the optical power of the uplink optical signal is fallen in
Except first preset range, second interface is switched to from the first interface；And/or if the downlink optical signal optical power
It falls in except the second preset range, switches to the second interface from the first interface.
If uplink optical signal or downlink optical signal emergent power are abnormal, second interface is switched to from first interface；Such as
Fruit uplink optical signal and the equal emergent power of downlink optical signal are abnormal, it is also necessary to switch to second interface from first interface.
Sender and recipient's difference due to up direction with down direction, judge the preset range of optical power exception
Also different.Reference light communication specification standard, for up direction, the first preset range be may be selected in 0~4dBm；For downlink side
To the second preset range may be selected in -26dBm~-3dBm.When the optical power for detecting uplink optical signal fall in 0~4dBm it
Outside, or when detecting that the optical power of downlink optical signal falls in except -26dBm~-3dBm or the light function of uplink optical signal
Rate and the optical power of downlink optical signal are respectively fallen in except its corresponding preset range, can determine that exception occur for optical power,
ONU switches to second interface from first interface.
There is the situation of optical power exception if it is being in operational process in system, in order to carry out ONU and OLT
Communication service be able to maintain continuous uninterrupted, the communication service information in the first interface is synchronized to described second and is connect
Mouthful, communication service information, which can be, refers to ongoing type of service, business progress and the information such as data cached.Such as, it is broadcasting
Video broadcasting is put, then the playback progress of video broadcasting in first interface and buffered video data synchronization are connect to second
Mouthful, second interface can continue to play video broadcasting on the basis of original playback progress according to these communication service informations, make
The interruption of the imperceptible business of user.
In step S303, communicated by the second interface with the OLT.
After ONU switches to second interface from first interface, complete to register in the olt by second interface, and carry out light letter
Signal communication etc..
Although after ONU switches to second interface from first interface the failure of optical power exception can be eliminated, in order to mention
Monitoring personnel of waking up issues alarm prompt if the optical power of the optical signal is fallen in except the preset range.Alarm prompt packet
Include but be not limited to starting jingle bell, indicator light flashing and pop-up prompting frame etc..
It is above-mentioned when judging whether optical power is abnormal, if the optical power of the downlink optical signal falls in the described second default model
Except enclosing, i.e., expression optical power is improper and cause by the transmitting optical power of OLT extremely.As an implementation of the invention
Example can repair the problem of first interface optical power exception, as shown in figure 4, specifically while starting second interface is communicated
It is as follows：
In S401, the op-tical power information of the downlink optical signal in the first interface is stored.
In S402, the op-tical power information is sent to the OLT, so that the OLT is according to the op-tical power information
Adjust the transmitting optical power of itself.
In embodiments of the present invention, ONU is stored in the op-tical power information for the downlink optical signal that first interface detects, light function
Rate information can be the value for the optical power that ONU is detected, be also possible to characterize the excessively high or too low mark of the optical power, and
The op-tical power information is fed back to OLT by up direction, and OLT receives the transmitting optical power that itself is adjusted after the op-tical power information.
Excessively high if optical power, then OLT reduces the transmitting optical power of itself；Too low if optical power, then OLT improves the transmitting light of itself
Power.After such fault restoration, ONU can switch to first interface and be communicated, or continues to use second interface and communicated.
In embodiments of the present invention, include first interface and second interface in ONU, connect by first interface with OLT, into
The optical signal communications of row uplink and downlink detect the optical power of optical signal in first interface, if the optical power of optical signal is fallen in
Except preset range, second interface is switched to from first interface, the optical signal of uplink and downlink is carried out by second interface and OLT
Communication, improves EPON network and the reliability communicated when optical power exception occurs.
Fig. 5 shows the structural block diagram of the protective device of ethernet passive optical network provided in an embodiment of the present invention, the device
It can be located in the ONU equipment of EPON network, the protection of the ethernet passive optical network for executing Fig. 3 and Fig. 4 description of the present invention
Method.For ease of description, only the parts related to this embodiment are shown.
Referring to Fig. 5, which includes：
Detection unit 51, detects the optical power of optical signal in first interface, and first interface is connecing of currently connecting with OLT
Mouthful.
Switch unit 52 switches to second from first interface and connects if the optical power of optical signal is fallen in except preset range
Mouthful, it is connect by second interface with OLT.
Communication unit 53 is communicated by second interface with OLT.
Optionally, detection unit 51 includes：
Uplink detection sub-unit, detects the optical power of the uplink optical signal in first interface, and uplink optical signal is connect by first
Mouth is sent to OLT.And
Downlink detection sub-unit, detects the optical power of the downlink optical signal in first interface, and downlink optical signal is sent by OLT
To first interface.
Switch unit 52 includes：
Uplink switching subelement, if the optical power of uplink optical signal is fallen in except the first preset range, from first interface
Switch to second interface.And/or
Downlink switching subelement, if the optical power of downlink optical signal is fallen in except the second preset range, from first interface
Switch to second interface.
Optionally, if the optical power of downlink optical signal is fallen in except the second preset range, which further includes：
Storage unit stores the op-tical power information of the downlink optical signal in first interface.
Op-tical power information is sent to OLT by transmission unit, so that OLT adjusts the transmitting light of itself according to op-tical power information
Power.
Optionally, which further includes：
Communication service information in first interface is synchronized to second interface by synchronization unit.
Optionally, which further includes：
Alarm Unit issues alarm prompt if the optical power of optical signal is fallen in except preset range.
In embodiments of the present invention, include first interface and second interface in ONU, connect by first interface with OLT, into
The optical signal communications of row uplink and downlink detect the optical power of optical signal in first interface, if the optical power of optical signal is fallen in
Except preset range, second interface is switched to from first interface, the optical signal of uplink and downlink is carried out by second interface and OLT
Communication, improves EPON network and the reliability communicated when optical power exception occurs.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (4)
1. a kind of guard method of ethernet passive optical network, which is characterized in that the method includes：
The optical power of optical signal in first interface is detected, the first interface is the interface currently connecting with optical line terminal OLT；
The first interface is in running order interface；
If the optical power of the optical signal is fallen in except preset range, second interface is switched to from the first interface, is passed through
The second interface is connect with the OLT；Wherein, the second interface is all the same with the first interface structure and function
Interface；
Communication service information in the first interface is synchronized to the second interface；Wherein, the communication service information packet
Include ongoing service type information, business progress msg and data cached information；
It is communicated by the second interface with the OLT；
Wherein, the optical power of optical signal includes in the detection first interface：
The optical power of the uplink optical signal in first interface is detected, the uplink optical signal is sent to OLT by the first interface；
And
The optical power of the downlink optical signal in first interface is detected, the downlink optical signal is sent to described first by the OLT
Interface；
If the optical power of the optical signal is fallen in except preset range, second interface packet is switched to from the first interface
It includes：
If the optical power of the uplink optical signal is fallen in except the first preset range, second is switched to from the first interface and is connect
Mouthful；And/or
If the optical power of the downlink optical signal is fallen in except the second preset range, described is switched to from the first interface
Two interfaces；
If the optical power of the downlink optical signal is fallen in except second preset range, the method also includes：
Store the op-tical power information of the downlink optical signal in the first interface；The op-tical power information includes：Under described
The value of row optical power, alternatively, characterizing the too high or too low mark of the downlink optical power；
The op-tical power information is sent to the OLT, so that the OLT adjusts the transmitting of itself according to the op-tical power information
Optical power.
2. the method as described in claim 1, which is characterized in that the method also includes：
If the optical power of the optical signal is fallen in except the preset range, alarm prompt is issued.
3. a kind of protective device of ethernet passive optical network, which is characterized in that described device includes：
Detection unit, detects the optical power of optical signal in first interface, and the first interface is currently to connect with optical line terminal OLT
The interface connect；The first interface is in running order interface；
Switch unit switches to if the optical power for the optical signal is fallen in except preset range from the first interface
Second interface is connect by the second interface with the OLT；Wherein, the second interface is and the first interface structure
The interface all the same with function；
Synchronization unit, for the communication service information in the first interface to be synchronized to the second interface；Wherein, described logical
Communication service information includes ongoing service type information, business progress msg and data cached information；
Communication unit, for being communicated by the second interface with the OLT；
Wherein, the detection unit includes：
Uplink detection sub-unit, for detecting the optical power of the uplink optical signal in first interface, the uplink optical signal is by institute
It states first interface and is sent to OLT；And
Downlink detection sub-unit, for detecting the optical power of the downlink optical signal in first interface, the downlink optical signal is by institute
It states OLT and is sent to the first interface；
The switch unit includes：
Uplink switching subelement, if the optical power for the uplink optical signal is fallen in except the first preset range, from described
First interface switches to second interface；And/or
Downlink switching subelement, if the optical power for the downlink optical signal is fallen in except the second preset range, from described
First interface switches to the second interface；
If the optical power of the downlink optical signal is fallen in except second preset range, described device further includes：
Storage unit, for storing the op-tical power information of the downlink optical signal in the first interface；The optical power letter
Breath includes：The value of the downlink optical power, alternatively, characterizing the too high or too low mark of the downlink optical power；
Transmission unit, for the op-tical power information to be sent to the OLT, so that the OLT is according to the op-tical power information
Adjust the transmitting optical power of itself.
4. device as claimed in claim 3, which is characterized in that described device further includes：
Alarm Unit issues alarm prompt if the optical power for the optical signal is fallen in except the preset range.
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| CN106550290B (en) * | 2015-09-21 | 2020-10-02 | 南京中兴软件有限责任公司 | Passive optical network power balancing method, device, terminal, unit and system |
| CN106937184B (en) | 2015-12-29 | 2021-08-06 | 中兴通讯股份有限公司 | A method and device for realizing activation |
| WO2019100267A1 (en) * | 2017-11-22 | 2019-05-31 | 华为技术有限公司 | Optical network unit network interface switching method and optical network unit |
| CN111970049B (en) * | 2019-05-20 | 2022-05-13 | 华为技术有限公司 | Optical power detection method and device |
| CN118870236B (en) * | 2024-07-05 | 2025-03-07 | 内蒙古电力(集团)有限责任公司阿拉善供电分公司 | Conversion interface method and system based on MEMS optical fiber matrix switch transmission device |
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| CN102202244B (en) * | 2010-03-23 | 2014-08-13 | 中兴通讯股份有限公司 | Method and device for improving protective performance of passive optical network |
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| CN101060369A (en) * | 2006-04-17 | 2007-10-24 | 华为技术有限公司 | A method and system for solving the errors under the PON PLOAM system |
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