CN1996809B - The system and method for enhancing the robustness of the passive optical network - Google Patents
The system and method for enhancing the robustness of the passive optical network Download PDFInfo
- Publication number
- CN1996809B CN1996809B CN2006100002089A CN200610000208A CN1996809B CN 1996809 B CN1996809 B CN 1996809B CN 2006100002089 A CN2006100002089 A CN 2006100002089A CN 200610000208 A CN200610000208 A CN 200610000208A CN 1996809 B CN1996809 B CN 1996809B
- Authority
- CN
- China
- Prior art keywords
- terminal
- optical signal
- uplink optical
- olt
- pon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
This invention provides one system and method to enhance PON robust property, which comprises terminals to send upper signals with different wave length and OLT to receive different upper light signals. The method comprises the following steps: setting PON terminal to support different upper signals to receive different light signals; when the signals is damaged, sending orders to switch all terminals to other wave length.
Description
Technical field
The present invention relates to communication field, relate in particular to a kind of system and method for enhancing PON (EPON) robustness.
Background technology
Advantages such as optical fiber has transmission frequency bandwidth, capacity is big, loss is low and antijamming capability is strong are suitable as at a high speed, the transmission medium of broadband services very much.And in various smooth access technologies, PON (EPON) as a kind of now and future very promising smooth access technology, just more and more be subjected to people's attention.
As shown in Figure 1, PON is made up of the terminal equipment and the multifiber of an OLT (local side apparatus), optical branching device, a plurality of far-ends.OLT is the equipment that is positioned at the carrier network end, upwards links to each other with network, links to each other with optical branching device downwards, connects by an optical fiber between local side apparatus and optical branching device, forms the trunk roads of optical fiber.Optical branching device adopts multifiber to be connected with a plurality of distance terminal equipment.Distance terminal equipment comprises ONT (Optical Network Terminal) and ONU (optical network unit).
Downlink data signal is continuous broadcast mode in PON, adopts TDM (time division multiplexing) technology, and as shown in Figure 2, each ONU or ONT will receive all downlink data signals that OLT issues.
Upstream data. signals adopts tdma in PON, and as shown in Figure 3, each ONT or ONU adopt burst mode to send light signal in the time slot of OLT appointment, upload data to OLT.The data that each ONT or ONU upload are assembled into compound frame at the OLT place.
In the transmittance process of above-mentioned upstream data, it is extremely important constraints that each ONT or ONU normally send data by the time slot of authorizing.ONT or ONU break down in PON, not in the time slot that OLT authorizes during the emission light signal; Perhaps, mistake appears in the up luminescent device hardware of ONT or ONU among the PON, when causing this ONT or ONU to launch light signal constantly.Such as, as shown in Figure 4, ONT B continues the emission uplink optical signal.At this moment, will seriously disturb the uplink optical signal of other ONT or ONU emission, cause OLT can't resolve the data that other ONT or ONU upload.Thereby cause the up channel of whole system to stop up.
In the middle of prior art, also there is not solution to the problems described above.
Summary of the invention
The system and method that the purpose of this invention is to provide a kind of PON of enhancing robustness, thus when the uplink communication that can work as PON breaks down, in time take measures to recover the uplink communication of PON, strengthen the robustness of PON.
The objective of the invention is to be achieved through the following technical solutions:
A kind of system that strengthens the EPON robustness comprises:
Terminal: comprise Optical Network Terminal ONT and/or optical network unit ONU, the emission optical module of terminal can send the uplink optical signal of different wave length to local side apparatus, under normal circumstances, terminal is unified to adopt a kind of wavelength in the different wave length that disposes to launch uplink optical signal to local side apparatus, and a plurality of terminal adopts tdma to send uplink optical signal; The reception optical module of terminal receives the downstream signal that local side apparatus issues by optical branching device;
Local side apparatus: the reception optical module receiving terminal of local side apparatus is to the uplink optical signal of the different wave length of its transmission, the emission optical module of local side apparatus sends downstream signal to terminal, when the uplink optical signal that detects passive optical network PON breaks down, sending downstream signal indicates all terminal unifications to switch to the another one wavelength to carry out uplink communication, according to the uplink optical signal after switching, take corresponding operation, make the uplink optical signal of PON recover normal.
Described local side apparatus also comprises:
Wavelength division multiplexer: the uplink optical signal that is used for different wave length that local side apparatus is received is distinguished.
A kind of method that strengthens the EPON robustness comprises:
The terminal support of A, configuration passive optical network PON sends the uplink optical signal of different wave length, under normal circumstances, the terminal of PON is unified to adopt a kind of wavelength in the different wave length that disposes to launch uplink optical signal to local side apparatus OLT, and a plurality of terminals adopt tdma to send uplink optical signal, and the OLT of configuration PON supports to receive wavelength optical signals;
B, after uplink optical signal that OLT detects PON breaks down, transmitting order to lower levels switches to the uplink optical signal of all terminals the another one wavelength of described configuration, OLT takes corresponding operation according to the uplink optical signal after the switching that receives, and makes the uplink optical signal of PON recover normal.
Described terminal comprises ONT and ONU.
Described step B specifically comprises:
B1, have the fault terminal to launch light signal constantly in the PON network or when launching light signal outside the time slot that OLT authorizes when OLT detects, the OLT transmitting order to lower levels switches to the uplink optical signal of all terminals the another one wavelength in the different wave length of described configuration;
B2, OLT take corresponding operation according to the uplink optical signal of the described another one wavelength of the transmission of the terminal after the described switching that receives, and make the uplink optical signal of PON recover normal.
Described step B2 specifically comprises:
When described fault terminal can't be handled the order that OLT issues, when still adopting the wavelength transmission uplink optical signal before switching, OLT does not receive the uplink optical signal that this fault terminal sends, receive only the uplink optical signal of the described another one wavelength that the terminal after the switching sends, it is normal that the uplink optical signal of PON recovers.
Described step B2 specifically comprises:
When described fault terminal can be handled the order that OLT issues, the same with terminal after other switches in the time slot that OLT authorizes during with described another one wavelength emission uplink optical signal, at this moment, it is normal that described fault terminal is recovered, and it is normal that the uplink optical signal of PON recovers.
Described step B2 specifically comprises:
B21, after described fault terminal is switched, launch light signal constantly or outside the time slot that OLT authorizes, launch light signal with described another one wavelength;
After B22, OLT detect uplink optical signal and break down, transmitting order to lower levels is closed all terminals one by one, search the terminal that breaks down, when closing described fault terminal, it is normal that the uplink communication of PON recovers, judge that then this terminal breaks down, continue to close this terminal, it is normal that the uplink optical signal of PON recovers.
As seen from the above technical solution provided by the invention, the present invention disposes OLT simultaneously and supports to receive two wavelength optical signals by the uplink optical signal that configuration ONT or ONU in the PON network support to send two different wave lengths.When thereby the uplink communication that can work as PON breaks down, in time detect the ONT or the ONU that break down, and the uplink communication of the recovery PON that takes appropriate measures, make the communication recovery of whole PON network normal, strengthen the robustness of PON.
Description of drawings
Fig. 1 is the structural representation of PON;
Fig. 2 is the downlink data link schematic diagram of PON;
Fig. 3 is the up data link schematic diagram of PON;
Fig. 4 is the schematic diagram that fault ONT B continues the emission uplink optical signal;
Fig. 5 is the structural representation of the terminal (comprising ONT and ONU) after the improvement of the present invention;
Fig. 6 is the structural representation of the OLT after the improvement of the present invention;
Fig. 7 is the process chart of the specific implementation of the method for the invention;
Fig. 8 is the networking schematic diagram of embodiment of the present invention.
Embodiment
The invention provides a kind of system and method for the PON of enhancing robustness, core of the present invention is: configuration ONT or ONU support to send the uplink optical signal of two different wave lengths, dispose OLT simultaneously and support to receive two wavelength optical signals.
Describe the present invention in detail below in conjunction with accompanying drawing, the basic structure of the structure of the described system of this method and PON network shown in Figure 1 is identical, and the described system of this method improves wherein the OLT and the internal structure and the function of terminal (comprising ONT and ONU).
The structure of the terminal after the improvement (comprising ONT and ONU) as shown in Figure 5, this terminal comprises that two emission optical modules, one receive that optical module, control module and PON protocol data are resolved, analysis module.Two emission optical modules can send the uplink optical signal of two different wave lengths respectively to OLT.The reception optical module of terminal can receive the downstream signal that OLT issues by optical branching device.
The structure of OLT after the improvement as shown in Figure 6.This OLT comprises an emission optical module, two reception optical modules, control module, the parsing of PON protocol data, analysis module and wavelength division multiplexers.Two reception optical modules of OLT can be by the uplink optical signal of wavelength division multiplexer difference receiving terminal (comprising ONT and ONU) to two different wave lengths of its transmission.The major function of wavelength division multiplexer is that the uplink optical signal of the different wave length that receives is made a distinction.The emission optical module of OLT can send downlink information to terminal (comprising ONT and ONU) by optical branching device.
When the uplink optical signal that detects PON as OLT breaks down, carry out uplink communication by indicating all terminal unifications to switch to the another one wavelength to terminal transmission downstream signal, then, according to the uplink optical signal after switching, take corresponding operation, make the uplink optical signal of PON recover normal.
The handling process of the specific implementation of the method for the invention comprises the steps: as shown in Figure 7
Step 7-1, configuration ONT or ONU support to send the uplink optical signal of two different wave lengths, dispose OLT simultaneously and support to receive two wavelength optical signals.
The present invention at first improves the ONT of PON network and the function of terminal (comprising ONT and ONU), makes OLT support to receive two wavelength optical signals.Make terminal (comprising ONT and ONU) support send the uplink optical signal of two different wave lengths, in actual applications, under normal circumstances, all terminals (comprising ONT and ONU) all send uplink optical signal according to identical wherein a kind of wavelength to OLT.
Such as, in networking shown in Figure 8, it is the uplink optical signal of 1310nm, 1410nm that terminal ONT A, ONT B, ONT C and ONT D can send wavelength to OLT respectively, it is the downstream signal of 1490nm that OLT sends wavelength to terminal.Under normal circumstances, terminal adopts wavelength 1310nm to the uplink optical signal that OLT sends.
Step 7-2, after OLT detects uplink optical signal and breaks down, OLT switches to the another one wavelength by transmitting order to lower levels with the uplink optical signal of all ONT or ONU.
In actual applications, when OLT detects lasting uplink optical signal, when perhaps OLT can't resolve the uplink optical signal of terminal, just thinking had the emission of terminal optical module to break down.
So OLT sends downstream signal by optical branching device to all terminals.Indicate all terminals that uplink optical signal is switched to the another one wavelength.Simultaneously, OLT receives only the signal of this another one wavelength.
Such as, in networking shown in Figure 8, after fault has taken place in the emission optical module of ONT A, ONT A launches uplink optical signal constantly to OLT, perhaps, ONT A does not launch light signal in the time slot that OLT authorizes, so, ONT A will seriously disturb the uplink optical signal of other ONT, causes whole uplink to stop up.After OLT detects uplink and breaks down, all issue an order just for all terminals (comprising ONT A, ONT B, ONT C and ONT D) in the PON network, indicate all terminals all up wavelength to be switched to 1410nm.
Step 7-3, OLT be according to the uplink optical signal after switching, and determines the ONT or the ONU that break down, and take corresponding operation, guarantees that whole PON network service recovers normal.
After having carried out above-mentioned handover operation, OLT is just according to the uplink optical signal after switching, and determines the ONT or the ONU that break down, and takes corresponding operation, guarantees that whole PON network service recovers normal.
After having carried out above-mentioned handover operation, following three kinds of situations can appear in the PON network:
1, since ONT A catastrophe failure or Optical Receivers take place can not operate as normal, cause it can't handle the order that OLT issues.ONT B, ONT C and ONT D adopt the 1410nm wavelength to carry out uplink communication at this moment, and OLT receives only the light signal of 1410nm wavelength, and the light signal of the still up emission of ONT A 1310nm wavelength, therefore, at this moment, ONT A can not disturb the uplink communication of other ONT, and the communication recovery of whole PON network is normal except that ONT A.
2, ONT can handle the down order of OLT, and ONT A and ONT B, ONT C, ONT D is the same is launching uplink optical signal under the 141Onm wavelength and only in the time slot that OLT authorizes, at this moment ONT A neither can disturb the uplink optical signal of other ONT, itself also recover normally, the communication recovery of whole PON network is normal.
3, ONT can handle the down order of OLT, but still continues the emission light signal or launch light signal outside the time slot that OLT authorizes after switching to the 1410nm wavelength, disturbs the uplink communication of other ONT.At this moment, OLT can transmitting order to lower levels, closes ONT A, ONT B, ONT C and ONT D one by one and searches the ONT that breaks down.When closing ONT A, it is normal that the uplink communication of whole PON network recovers, and therefore can judge that ONT A breaks down.So OLT closes ONT A, whole PON network service recovers normal except ONT A.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (8)
1. a system that strengthens the EPON robustness is characterized in that, comprising:
Terminal: comprise Optical Network Terminal ONT and/or optical network unit ONU, the emission optical module of terminal can send the uplink optical signal of different wave length to local side apparatus, under normal circumstances, terminal is unified to adopt a kind of wavelength in the different wave length that disposes to launch uplink optical signal to local side apparatus, and a plurality of terminal adopts tdma to send uplink optical signal; The reception optical module of terminal receives the downstream signal that local side apparatus issues by optical branching device;
Local side apparatus: the reception optical module receiving terminal of local side apparatus is to the uplink optical signal of the different wave length of its transmission, the emission optical module of local side apparatus sends downstream signal to terminal, when the uplink optical signal that detects passive optical network PON breaks down, sending downstream signal indicates all terminal unifications to switch to the another one wavelength to carry out uplink communication, according to the uplink optical signal after switching, take corresponding operation, make the uplink optical signal of PON recover normal.
2. system according to claim 1 is characterized in that, described local side apparatus also comprises:
Wavelength division multiplexer: the uplink optical signal that is used for different wave length that local side apparatus is received is distinguished.
3. a method that strengthens the EPON robustness is characterized in that, comprising:
The terminal support of A, configuration passive optical network PON sends the uplink optical signal of different wave length, under normal circumstances, the terminal of PON is unified to adopt a kind of wavelength in the different wave length that disposes to launch uplink optical signal to local side apparatus OLT, and a plurality of terminals adopt tdma to send uplink optical signal, and the OLT of configuration PON supports to receive wavelength optical signals;
B, after uplink optical signal that OLT detects PON breaks down, transmitting order to lower levels switches to the uplink optical signal of all terminals the another one wavelength of described configuration, OLT takes corresponding operation according to the uplink optical signal after the switching that receives, and makes the uplink optical signal of PON recover normal.
4. method according to claim 3 is characterized in that described terminal comprises ONT and ONU.
5. according to claim 3 or 4 described methods, it is characterized in that described step B specifically comprises:
B1, have the fault terminal to launch light signal constantly in the PON network or when launching light signal outside the time slot that OLT authorizes when OLT detects, the OLT transmitting order to lower levels switches to the uplink optical signal of all terminals the another one wavelength in the different wave length of described configuration;
B2, OLT take corresponding operation according to the uplink optical signal of the described another one wavelength of the transmission of the terminal after the described switching that receives, and make the uplink optical signal of PON recover normal.
6. method according to claim 5 is characterized in that, described step B2 specifically comprises:
When described fault terminal can't be handled the order that OLT issues, when still adopting the wavelength transmission uplink optical signal before switching, OLT does not receive the uplink optical signal that this fault terminal sends, receive only the uplink optical signal of the described another one wavelength that the terminal after the switching sends, it is normal that the uplink optical signal of PON recovers.
7. method according to claim 5 is characterized in that, described step B2 specifically comprises:
When described fault terminal can be handled the order that OLT issues, the same with terminal after other switches in the time slot that OLT authorizes during with described another one wavelength emission uplink optical signal, at this moment, it is normal that described fault terminal is recovered, and it is normal that the uplink optical signal of PON recovers.
8. method according to claim 5 is characterized in that, described step B2 specifically comprises:
B21, after described fault terminal is switched, launch light signal constantly or outside the time slot that OLT authorizes, launch light signal with described another one wavelength;
After B22, OLT detect uplink optical signal and break down, transmitting order to lower levels is closed all terminals one by one, search the terminal that breaks down, when closing described fault terminal, it is normal that the uplink communication of PON recovers, judge that then this terminal breaks down, continue to close this terminal, it is normal that the uplink optical signal of PON recovers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100002089A CN1996809B (en) | 2006-01-04 | 2006-01-04 | The system and method for enhancing the robustness of the passive optical network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100002089A CN1996809B (en) | 2006-01-04 | 2006-01-04 | The system and method for enhancing the robustness of the passive optical network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1996809A CN1996809A (en) | 2007-07-11 |
| CN1996809B true CN1996809B (en) | 2010-10-27 |
Family
ID=38251773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006100002089A Active CN1996809B (en) | 2006-01-04 | 2006-01-04 | The system and method for enhancing the robustness of the passive optical network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1996809B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101902665B (en) * | 2009-05-26 | 2014-05-07 | 华为技术有限公司 | Optical line terminal, optical add-drop multiplexer and optical access system |
| CN102148682B (en) * | 2010-02-08 | 2016-02-10 | 中兴通讯股份有限公司 | A kind of method and system that the abnormal optical network unit of luminescence is correctly located |
| CN102082706B (en) * | 2010-12-23 | 2014-06-11 | 中兴通讯股份有限公司 | Method for monitoring test access points and data links |
| CN103051983B (en) * | 2011-10-12 | 2017-05-10 | 中兴通讯股份有限公司 | Method and device for processing uplink data exception |
| WO2015013856A1 (en) * | 2013-07-29 | 2015-02-05 | 华为技术有限公司 | Optical assembly and passive optical network (pon) system |
| CN104301033B (en) * | 2014-08-26 | 2017-01-25 | 国家电网公司 | Electric power optical fiber communication network robustness indicator evaluation method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0597719A2 (en) * | 1992-11-12 | 1994-05-18 | Nortel Networks Corporation | TDM/TDMS telecommunications systems |
| CN1233893A (en) * | 1998-04-28 | 1999-11-03 | 株式会社日立制作所 | Bidirectional line switched ring network system |
| CN1578199A (en) * | 2003-07-07 | 2005-02-09 | 三星电子株式会社 | Self-healing wavelength division multiplexing-passive optical network system |
-
2006
- 2006-01-04 CN CN2006100002089A patent/CN1996809B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0597719A2 (en) * | 1992-11-12 | 1994-05-18 | Nortel Networks Corporation | TDM/TDMS telecommunications systems |
| CN1233893A (en) * | 1998-04-28 | 1999-11-03 | 株式会社日立制作所 | Bidirectional line switched ring network system |
| CN1578199A (en) * | 2003-07-07 | 2005-02-09 | 三星电子株式会社 | Self-healing wavelength division multiplexing-passive optical network system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1996809A (en) | 2007-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101047442B (en) | Maintenance method of passive optical network and its system | |
| US8335439B2 (en) | Method of ethernet frame forward error correction initialization and auto-negotiation | |
| US8285139B2 (en) | Method, system, and apparatus for managing alarms in long-reach passive optical network system | |
| CN101005317A (en) | Method and device for detecting up transmitting error and protecting passive light network terminal | |
| CN1996809B (en) | The system and method for enhancing the robustness of the passive optical network | |
| US9686036B2 (en) | Method, apparatus and system for transmitting upstream burst data in PON system | |
| US8199775B2 (en) | Optical transmission device and optical transmission method | |
| US20140161438A1 (en) | Protection for distributed radio access networks | |
| CN110380809B (en) | Wavelength division multiplexing transmission system and transmission method thereof | |
| CN101848054A (en) | System and method for leading wavelength division multiplexing passive optical network to realize broadcast function with self-healing function | |
| WO2011009368A1 (en) | Method, apparatus and system for transmitting information in passive optical network | |
| US20050123293A1 (en) | Optical transmission method and system | |
| CN104393914A (en) | A multiplex route recovering method for an optical fiber differential protection device | |
| US9287981B2 (en) | Station-side apparatus and PON system | |
| CN101902665B (en) | Optical line terminal, optical add-drop multiplexer and optical access system | |
| EP1524781A1 (en) | Optical link performance monitoring using OTDM with laser for data transmission/reception | |
| JP2012257167A (en) | Communication control device, termination device, and communication control program | |
| EP2562947B1 (en) | Method, apparatus and system for passive optical network communication | |
| US7315694B2 (en) | Apparatus for switching optical channel overhead in optical supervisory channel of optical transport network system and apparatus for forwarding optical channel maintenance signal | |
| Wang et al. | Implemention of a survivable EPON system supporting direct communication between ONUs | |
| US7313327B2 (en) | Switching control device for wavelength-division multiplexing optical signal | |
| CN1921356B (en) | Radio-frequency optical transport module based on TD mode and synchronous control method | |
| CN101150366A (en) | Wave division multiplexing optical transmission system | |
| JP2014135679A (en) | Terminal-side communication device, station-side device and communication failure restoration method | |
| CN214675520U (en) | Optical line protection device and optical line network transmission equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |