CN101005317A - Method and device for detecting up transmitting error and protecting passive light network terminal - Google Patents
Method and device for detecting up transmitting error and protecting passive light network terminal Download PDFInfo
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- CN101005317A CN101005317A CNA2006100009393A CN200610000939A CN101005317A CN 101005317 A CN101005317 A CN 101005317A CN A2006100009393 A CNA2006100009393 A CN A2006100009393A CN 200610000939 A CN200610000939 A CN 200610000939A CN 101005317 A CN101005317 A CN 101005317A
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Abstract
The method includes following main steps: obtaining up going time slot assigned to the terminal from time slot assignment message sent to terminal in passive optical network (PON) from office equipment (OLT); detecting optical signal up sent by the terminal; when detected that the terminal sends optical signal outside the up going time slot, the method stops the terminal to send optical signal. The said terminals in the invention include optical feedback module and optical detection control module mainly. When PON terminals send signal not according to pointed time slit, the disclosed method takes measures to recover up going communication of PON in time so as to enhance robustness of PON.
Description
Technical field
The present invention relates to communication field, relate in particular to a kind of up method and apparatus wrong and protection PON (EPON) terminal that sends that detects.
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.
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, as shown in Figure 1.OLT is positioned at the equipment of 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 (network-termination device) and ONU (network user 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.
Upward signal 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 upward signal, it is extremely important constraint constrains that each ONT or ONU normally send data by the time slot of appointment.ONT or ONU break down in PON, not in the time slot of OLT appointment 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 3 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 purpose of this invention is to provide a kind of up method and apparatus wrong and protection PON terminal that sends that detects; passive light network terminal can be detected the fault of optical module and handle; realize protection automatically, thereby strengthen the reliability of passive light network terminal, ensure the normal operation of network.
The objective of the invention is to be achieved through the following technical solutions:
A kind of method that detects up transmission mistake and protection passive light network terminal, this method may further comprise the steps:
A, be handed down to the ascending time slot that obtains to distribute to this terminal the time slot assignment message of passive optical network PON terminal from local side apparatus OLT;
B, the light signal that described terminal is upwards sent detect, and when detecting this terminal send light signal outside described ascending time slot, stop this terminal and upwards send light signal.
Described steps A specifically comprises:
Be handed down to from OLT and obtain the time slot assignment message of terminal to allow this terminal upwards to send the time started and the termination time of the ascending time slot of light signal, according to this ascending time slot, obtain forbid this terminal opposite and upwards send the window of forbidding of light signal with this ascending time slot phase place.
Described terminal comprises network-termination device ONT or network user's unit ONU.
Described step B specifically comprises:
From the light signal that terminal upwards sends, extract the light signal fed back that is used to monitor, this light signal fed back and the described window of forbidding are carried out the logical AND operation, when determine when forbidding in the window that this terminal has light signal to send, then to stop this terminal and upwards send light signal according to result described with operation.
Described step B specifically comprises:
When described light signal fed back with described that forbid window with the result during for logic high, judge then that described confusion has appearred in the up transmission of this terminal, stops this terminal upwards to send light signal when forbidding that this terminal has light signal to send in the window; When being logic low, judging then described and forbid that this terminal does not have light signal to send in the window that the up transmission of this terminal is normal with the result when described.
A kind of device that detects up transmission mistake and protection passive light network terminal comprises:
The light feedback module: be used for extracting the feedback signal that is used to monitor from the light signal that terminal upwards sends, this feedback signal passed to light detect control module, the light feedback module can be formed by optical coupler and feedback optical fiber;
Light detects control module: be used for distributing to according to OLT the ascending time slot of terminal, the feedback signal that the light feedback module is passed over detects, and when determining that this terminal has light signal to send outside described ascending time slot, then stops this terminal and upwards sends light signal.
Described light detects control module and comprises:
Forbid window module: be used for distributing to the ascending time slot of terminal, extract forbid this terminal opposite and upwards send the window of forbidding of light signal, this is forbidden that window information passes to logic judgment module with this ascending time slot phase place according to OLT;
Logic judgment module: be used for forbid window and the described feedback signal that receive are carried out the logical AND operation, when with result when being logic high, determine to forbid that described this terminal has light signal to send in the window, confusion has appearred in the up transmission of this terminal, stops this terminal and upwards sends light signal; When with result when being logic low, determine that the up transmission of this terminal is normal.
Comprise:
Optical module: be used to receive OLT by the downlink optical signal that comprises time slot assignment message that optical branching device issues, this downlink optical signal is passed to protocol process module, the data that protocol process module is passed over send to OLT;
Protocol process module: the downlink optical signal that is used for optical module is passed over carries out protocol processes, the time slot assignment message that passes over according to optical module, extract OLT and distribute to the time started and the termination time of the ascending time slot of this terminal, this ascending time slot information is passed to light detect control module.
As seen from the above technical solution provided by the invention, the present invention detects by the light signal that the terminal to PON upwards sends, in the time of can working as terminal and outside the ascending time slot that OLT distributes, upwards send light signal, stop this terminal and upwards send light signal, recover the uplink communication of PON.
The present invention detects control module and light feedback module by light is set in the terminal of PON, make terminal carry out self check and processing to the optical module fault.When the optical module that detects terminal, just stops this terminal upwards to send light signal when sending light signal violating that OLT distributes to the time slot arrangement of oneself, the terminal that makes among the PON other is transceive data normally still, thereby does not disturb the normal operation of PON.
The present invention makes the fail safe of PON obtain promoting effectively, has strengthened 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 upward signal link schematic diagram of PON;
Fig. 4 is the schematic diagram that fault ONT 3 continues the emission uplink optical signal;
Fig. 5 is the structural representation of specific implementation of the terminal of described detection of this method and the upward signal mistake of recovering PON;
Fig. 6 is the process chart of specific implementation of the method for detection of the present invention and the upward signal mistake of recovering PON;
Fig. 7 is the Sstart (time started) of OLT uplink frame of designated terminal in downlink frame and the schematic diagram of Sstop (concluding time);
Fig. 8 obtains the ascending time slot of terminal and the schematic diagram that the sync detection window module obtains detection window for protocol process module;
Fig. 9 for detection window and feedback signal carry out with logical operation, and the generation switch controlling signal schematic diagram.
Embodiment
The invention provides a kind of up method and apparatus wrong and protection PON terminal that sends that detects; core of the present invention is: the time slot assignment message that terminal issues according to OLT obtains forbidding oneself upwards sending the window of forbidding of signal; terminal forbids that at this window inter-sync detects the light signal that own optical module upwards sends; if find in this forbids window, to have light signal to send; judge that then its up transmission causes confusion, and stop upwards to send light signal.
Describe the present invention in detail below in conjunction with accompanying drawing, the structure of the specific implementation of the described device of this method as shown in Figure 5, this device can be the PON terminal, comprising ONT or ONU, comprises as lower module:
Optical module: be used to receive OLT by the downlink optical signal that comprises time slot assignment message that optical branching device issues, this downlink optical signal is passed to protocol process module.The data that protocol process module is passed over send to OLT.
Protocol process module: the downlink optical signal that is used for optical module is passed over carries out protocol processes, the time slot assignment message that passes over according to optical module, extract OLT and distribute to the time started and the termination time of the ascending time slot of this terminal, this ascending time slot information is passed to light detect control module.
Light feedback module: be used for extracting the feedback signal that is used to monitor, this feedback signal passed to light detect control module from the light signal that optical module upwards sends.The light feedback module can be formed by optical coupler and feedback optical fiber.
Light detects control module: be used for the ascending time slot information that passes over according to protocol process module, the feedback signal that the light feedback module is passed over detects, when determining that this terminal has light signal to send outside described ascending time slot, then stop this terminal and upwards send light signal.Light detection control module comprises forbids window module and logic judgment module.
Wherein, forbid window module: be used for distributing to the ascending time slot of terminal, extract forbid this terminal opposite and upwards send the window of forbidding of light signal, this is forbidden that window information passes to logic judgment module with this ascending time slot phase place according to OLT;
Wherein, logic judgment module: be used for forbid window and the described feedback signal that receive are carried out the logical AND operation, when with result when being logic high, determine to forbid that described this terminal has light signal to send in the window, confusion has appearred in the up transmission of this terminal, stops this terminal and upwards sends light signal; When with result when being logic low, determine that the up transmission of this terminal is normal.
The handling process of the specific implementation of the method for the invention comprises the steps: as shown in Figure 6
Step 6-1, from the time slot assignment message that OLT issues, extract the ascending time slot of distributing to this terminal and forbid that this terminal upwards sends the window of forbidding of light signal.
In PON, specify the time started and the concluding time of the uplink frame of each terminal in the time slot assignment message that OLT carries in downlink frame, promptly specify the ascending time slot of each terminal.With EPON (broadband passive optical network) is example, the Sstart (time started) of OLT uplink frame of designated terminal in downlink frame and the schematic diagram of Sstop (concluding time), as shown in Figure 7.
The described time slot assignment message that the protocol process module of terminal passes over according to optical module, therefrom extract the time started and the termination time of the ascending time slot of distributing to this terminal, promptly extract the ascending time slot of distributing to this terminal, this ascending time slot information is passed to light detect control module.
Light detects the ascending time slot information that control module passes over according to protocol process module, obtain the time started and the termination time of the ascending time slot of terminal, obtain ascending time slot phase place with terminal opposite forbid window, this forbids that window is to forbid that this terminal sends the window of uplink optical signal, can be used as the synchronous control switch that light detects control module.
Above-mentioned protocol process module obtains the ascending time slot of terminal and light and detects process that control module obtains to forbid window as shown in Figure 8.
Step 6-2, from the light signal that terminal upwards sends, extract light signal fed back, this light signal fed back is carried out and operation with the described window of forbidding.
The light feedback module of terminal extracts the light signal fed back that is used to monitor from the light signal that the optical module of terminal upwards sends, on specific implementation, can from the light signal that optical module upwards sends, tell a branched optical signal by optical coupler as light signal fed back.Then, by feedback optical fiber this light signal fed back is passed to light and detect control module.Optical branching device preferably is installed in ONT or ONU inside.
The feedback signal that window and light feedback module pass over of forbidding that light detection control module will obtain is carried out the logical operation.
Step 6-3, according to the operation the result determine whether the up transmission of terminal confusion occurred.If, then transmit control signal to optical module, control this terminal and stop upwards to send light signal.
After light detection control module will forbid that window and feedback signal have been carried out the logical operation, determine in this forbids window, whether to have signal output according to operating result, if with the result be high level " 1 ", then judge signal output is arranged in this forbids window, think that confusion has appearred in the up transmission of this terminal, give the optical module of this terminal then by the transmit button control signal, cut off the up transmission link of this terminal, make it stop upwards to send data, the terminal that makes among the PON other is transceive data normally still, thereby does not disturb the normal operation of PON; If with the result be low level " 0 ", judge that then the up transmission of this terminal is normal.
Above-mentioned will forbid window and feedback signal carry out with logical operation, and produce switch controlling signal, as shown in Figure 9.
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 kind of method that detects up transmission mistake and protection passive light network terminal is characterized in that this method may further comprise the steps:
A, be handed down to the ascending time slot that obtains to distribute to this terminal the time slot assignment message of passive optical network PON terminal from local side apparatus OLT;
B, the light signal that described terminal is upwards sent detect, and when detecting this terminal send light signal outside described ascending time slot, stop this terminal and upwards send light signal.
2, method according to claim 1 is characterized in that, described steps A specifically comprises:
Be handed down to from OLT and obtain the time slot assignment message of terminal to allow this terminal upwards to send the time started and the termination time of the ascending time slot of light signal, according to this ascending time slot, obtain forbid this terminal opposite and upwards send the window of forbidding of light signal with this ascending time slot phase place.
3, method according to claim 1 is characterized in that, described terminal comprises network-termination device ONT or network user's unit ONU.
4, according to claim 2 or 3 described methods, it is characterized in that described step B specifically comprises:
From the light signal that terminal upwards sends, extract the light signal fed back that is used to monitor, this light signal fed back and the described window of forbidding are carried out the logical AND operation, when determine when forbidding in the window that this terminal has light signal to send, then to stop this terminal and upwards send light signal according to result described with operation.
5, method according to claim 4 is characterized in that, described step B specifically comprises:
When described light signal fed back with described that forbid window with the result during for logic high, judge then that described confusion has appearred in the up transmission of this terminal, stops this terminal upwards to send light signal when forbidding that this terminal has light signal to send in the window; When being logic low, judging then described and forbid that this terminal does not have light signal to send in the window that the up transmission of this terminal is normal with the result when described.
6, a kind of device that detects up transmission mistake and protection passive light network terminal is characterized in that, comprising:
The light feedback module: be used for extracting the feedback signal that is used to monitor from the light signal that terminal upwards sends, this feedback signal passed to light detect control module, the light feedback module can be formed by optical coupler and feedback optical fiber;
Light detects control module: be used for distributing to according to OLT the ascending time slot of terminal, the feedback signal that the light feedback module is passed over detects, and when determining that this terminal has light signal to send outside described ascending time slot, then stops this terminal and upwards sends light signal.
7, device according to claim 6 is characterized in that, described light detects control module and comprises:
Forbid window module: be used for distributing to the ascending time slot of terminal, extract forbid this terminal opposite and upwards send the window of forbidding of light signal, this is forbidden that window information passes to logic judgment module with this ascending time slot phase place according to OLT;
Logic judgment module: be used for forbid window and the described feedback signal that receive are carried out the logical AND operation, when with result when being logic high, determine to forbid that described this terminal has light signal to send in the window, confusion has appearred in the up transmission of this terminal, stops this terminal and upwards sends light signal; When with result when being logic low, determine that the up transmission of this terminal is normal.
8, device according to claim 6 is characterized in that, comprising:
Optical module: be used to receive OLT by the downlink optical signal that comprises time slot assignment message that optical branching device issues, this downlink optical signal is passed to protocol process module, the data that protocol process module is passed over send to OLT;
Protocol process module: the downlink optical signal that is used for optical module is passed over carries out protocol processes, the time slot assignment message that passes over according to optical module, extract OLT and distribute to the time started and the termination time of the ascending time slot of this terminal, this ascending time slot information is passed to light detect control module.
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| CNA2006100009393A CN101005317A (en) | 2006-01-16 | 2006-01-16 | Method and device for detecting up transmitting error and protecting passive light network terminal |
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| CNA2006100009393A CN101005317A (en) | 2006-01-16 | 2006-01-16 | Method and device for detecting up transmitting error and protecting passive light network terminal |
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| CN102118193A (en) * | 2011-01-12 | 2011-07-06 | 深圳市易飞扬通信技术有限公司 | Passive optical network fault diagnosis system based on optical line terminal module |
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Application publication date: 20070725 |