CN101127567A - A method and device for optical line terminal to detect the optical power of optical network unit - Google Patents
A method and device for optical line terminal to detect the optical power of optical network unit Download PDFInfo
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- CN101127567A CN101127567A CN 200710122060 CN200710122060A CN101127567A CN 101127567 A CN101127567 A CN 101127567A CN 200710122060 CN200710122060 CN 200710122060 CN 200710122060 A CN200710122060 A CN 200710122060A CN 101127567 A CN101127567 A CN 101127567A
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Abstract
The utility model discloses an optical power checking method and device of an optical network unit (ONU) at the optical line terminal (OLT) side. The method is characterized in the following steps: firstly, the OLT setups the object ONU registered and the other ONUs unregistered; then the OLT controls the object ONU to illuminate continuously for a period; during the continuous illuminating period of the object ONU, the OLT checks the optical power transmitted from the object ONU. The utility model can check the ONU optical power correctly at the OLT side under the premises of sufficiently utilizing the prior source without increasing the cost.
Description
Technical field
The present invention relates to the luminous power detection technique, refer to that especially a kind of optical line terminal (OLT) side detects the method and apparatus of optical network unit (ONU) luminous power.
Background technology
EPON (PON) have save fiber resource, to the transparent characteristics of procotol, in optical access network, playing the part of important role.Nowadays the PON technology has become the hot technology in the optical access network field.
The PON technology is the optical fiber access technology of a kind of point to multiple spot, and it is made up of the OLT of office's side, the ONU and the Optical Distribution Network (ODN) of user side.Can form topological structures such as tree type, star-like, bus-type neatly.So-called " passive ", be meant do not contain any active electronic device among the ODN, without any need for the power supply power supply, all form, so the cost of its management maintenance is lower, market application foreground light by optical branching device passive devices such as (Splitter).
Now, the PON system constantly develops, and whether can carry out operation and maintenance to system efficiently, is crucial.In existing P ON system, can user side ONU be dispersed in each user's point, manage most important effectively to it.ONU is connected to OLT through ODN, ODN can be made of a plurality of optical branching device cascades, according to the system requirements flexible configuration, signal is every to have certain decay through an optical branching device, different optical branching device decay have nothing in common with each other, signal is transferred to the OLT side from the ONU side and often passes through a plurality of optical branching devices, adds the decay that optical fiber is intrinsic, and the signal light power that arrives the OLT side has decayed many.In beginning and later system maintenance process, effectively the ONU optical module is detected, understanding is from the luminous power situation of ONU, to help to judge whether this ONU is in normal operating conditions, make things convenient for system maintenance, but the ONU optical module is different from the normal optical module in context of detection, difference is, all ONU optical module transmitting optical powers are all discontinuous, can not detect easily.
In general, existing ONU luminous power detection technique has following two kinds:
1, user side equipment ONU realizes technology: this technology uses the ONU optical module that has the transmitting optical power measuring ability to realize.
It detects principle: the ONU optical module sends useful signal, and charging by electric capacity of this useful signal control obtains smooth voltage, and this voltage is directly proportional with work average light power in period, calculates the luminous average power of ONU optical module according to this voltage.Intrinsic according to known ODN again decay calculates the luminous power that ONU sends to OLT.
The ONU optical module that has the transmitting optical power measuring ability has increased chip in inside, and this has increased hardware circuit, makes cost improve, therefore present commercial value costliness.
2, the side apparatus OLT of office realizes technology: the cooperation of this Technology Need OLT medium access control system (MAC) chip, needs increase modulus (A/D) transducer of high-speed, high precision.
It detects principle: under the control of OLTMAC chip, A/D converter detects the value of ONU optical module receiving intensity index signal (RSSI) when ONU is luminous, by calibrating, calculate the luminous power from ONU that the OLT side joint is received.
The method that typical OLT side of this technology detects from the luminous power of ONU is: ONU optical module inside is selected the preamplifier of band RSSI for use, RSSI is the analog current signal of preamplifier output, be converted to voltage signal by external suitable resistance R, A/D converter detects the value of RSSI when ONU is luminous under the control of PON OLT MAC chip, by calibrating, calculate the luminous power from ONU that the OLT side joint is received.
Why the cooperation of PON OLT MAC chip will be arranged, be because have only PON OLT MAC chip to know the up transmitting time of certain ONU and the identity code (ID) of ONU, realize that PON OLT optical module detects the luminous power that each ONU sends over, the cooperation of PON OLT MAC chip just must be arranged
In addition and since the single ONU of PON time of uplink assignment in the microsecond rank, A/D converter need have higher switching rate or need have preposition sampling hold circuit, the A/D converter price of this high-speed, high precision is very high.
Therefore, make and cause cost to increase substantially in this way.
Though more than two kinds of methods can realize that the OLT side is to the detection from the luminous power of ONU, but method 1 needs the ONU optical module to carry measuring ability, and this ONU optical module that carries measuring ability has increased hardware circuit owing to having increased chip in inside, costs an arm and a leg usually; Method 2 also needs additionally to increase the A/D converter of high-speed, high precision except needing the control of OLT MAC chip, causes the increase of single board design complexity, product cost to increase.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of OLT of system of PON cheaply side to detect the method and apparatus of ONU luminous power, utilizes the present invention, can fully use under the prerequisite of existing resource, in the correct luminous power that detects from ONU of OLT side, and do not increase product cost.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of optical line terminal OLT side detects the method for optical network unit ONU luminous power, and this method may further comprise the steps:
A, OLT are provided with target ONU registration, make described target ONU have the ID of self, other ONU is set does not simultaneously register;
B, OLT control described target ONU and continue luminous a period of time;
C, OLT detect the luminous power from described target ONU.
Wherein, described step B is: OLT forces luminous instruction or configuration maximum bandwidth to be instructed to target ONU according to the configuration information transmission of target ONU.
Further, described step B is: OLT sends and carries the luminous instruction of pressure of described id information to target ONU.
Preferably, further comprise after the described step B: OLT judges whether to receive feedback information,
If then the OLT configuration maximum bandwidth instruction that will carry described id information sends to target ONU, target ONU continues luminous a period of time;
If not, then do not operate.
This method further comprises: repeat described steps A-step C, in the luminous power of OLT side detection from other target ONU.
Wherein, luminous time length is determined according to the detection rates of OLT side OLT optical module and the speed of inter-IC bus IIC interface described in the step C.
A kind of OLT side detects the device of ONU luminous power, and this device comprises: Registering modules, control light emitting module are set, reach detection module, wherein,
Registering modules is set, is used to be provided with target ONU registration, and notice control light emitting module controlled target ONU continues luminous a period of time;
The control light emitting module is used for according to from the described notice that Registering modules is set, and controlled target ONU continues luminous a period of time, and the notice detection module target ONU continue luminous during this period of time in, detection is from the luminous power of target ONU;
Detection module is used for according to the described notice from the control light emitting module, target ONU continue luminous during this period of time in, detect luminous power from target ONU.
Further, described control light emitting module comprises memory module and sending module, wherein,
Memory module is used to store the configuration information of all ONU, according to from the described notice that Registering modules is set, from the configuration information of self internal extraction target ONU, sends corresponding instruction according to the configuration information notice sending module of target ONU;
Sending module is used for sending and forcing luminous instruction or configuration maximum bandwidth to be instructed to target ONU according to from the described notice of memory module, and the notice detection module target ONU continue luminous during this period of time in, detect luminous power from target ONU.
Further, described control light emitting module comprises instruction sending module, feedback judge module, configured bandwidth module, wherein,
Instruction sending module is used for send and force luminous instruction to target ONU, and notice feedback judge module feeding back judgement according to from the described notice that Registering modules is set;
The feedback judge module is used for judging according to the described notice from instruction sending module whether OLT receives feedback information,
When receiving feedback information, notice configured bandwidth block configuration maximum bandwidth is given target ONU;
When not receiving feedback information, the notice detection module target ONU continue luminous during this period of time in, detect luminous power from target ONU;
The configured bandwidth module, be used for according to the described notice of coming the self feed back judge module, give respective objects ONU according to the id information of target ONU configuration maximum bandwidth, the notice detection module target ONU continue luminous during this period of time in, detect luminous power from target ONU.
Utilize the present invention, only need control ONU luminous continuously, utilize the software and hardware resources of the existing PON of the function of the existing detection luminous power of OLT side OLT optical module and other system just can realize the luminous power of OLT side detection from ONU, simple, do not increase device on the veneer, saved the PON product cost, and owing to reduced the time of moving at these devices, saved detection time, solve existing detection technique and realized complexity and the high problem of cost, helped improving the efficient of PON network operation.
Description of drawings
Fig. 1 detects the structure drawing of device of ONU luminous power for OLT side of the present invention;
Fig. 2 is first kind of structure chart of control light emitting module in apparatus of the present invention;
Fig. 3 is second kind of structure chart of control light emitting module in apparatus of the present invention;
Fig. 4 detects the luminous power schematic diagram for OLT optical module among the present invention;
Fig. 5 detects the realization flow figure of ONU luminous power for OLT side of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment concrete enforcement of the present invention is described further.
The invention provides the device that a kind of OLT side detects the ONU luminous power, shown in the structure drawing of device that Fig. 1 OLT side of the present invention detects the ONU luminous power, this device comprises Registering modules 11, control light emitting module 12, and detection module 13 is set.
Wherein, Registering modules 11 is set, is used to be provided with ONU (hereinafter referred to as the target ONU) registration that will detect, and notice control light emitting module 12 controlled target ONU continue luminous a period of time.Wherein, it is that OLT distributes an ID for this target ONU that target ONU registration is set, and this target ONU sends feedback information to OLT after receiving this ID, has accepted this ID to prove this target ONU, and ONU1 just can directly carry out the instruction of carrying this ID in the future like this; Control light emitting module 12 is used for according to from the notice that Registering modules 11 is set, and controlled target ONU continues luminous a period of time, and notice detection module 13 target ONU continue luminous during this period of time in, detection is from the luminous power of target ONU; Detection module 13 is used for detecting the luminous power from target ONU according to the notice from control light emitting module 12.
Further, the structure of control light emitting module 12 can be divided into two kinds, and Fig. 2 is first kind of structure chart of control light emitting module in apparatus of the present invention, and Fig. 3 is second kind of structure chart of control light emitting module in apparatus of the present invention.
As shown in Figure 2, control light emitting module 12 comprises memory module 121 and sending module 122.Memory module 121 is used to store the configuration information of all ONU, according to from the notice that Registering modules 11 is set, from the configuration information of self internal extraction target ONU, sends corresponding instruction according to the configuration information notice sending module 122 of target ONU; Sending module 122, be used for according to notice from memory module 121, the configuration maximum bandwidth that transmission is carried the luminous instruction of pressure of described id information or carried described id information is instructed to target ONU, make target ONU continue luminous a period of time, and notice detection module 13 target ONU continue luminous during this period of time in, detect luminous power from target ONU.
As shown in Figure 3, control light emitting module 12 can also comprise instruction sending module 121 ', the feedback judge module 122 ', configured bandwidth module 123 '.Instruction sending module 121 ', be used for according to from the notice that Registering modules 11 is set, send carry described id information the luminous instruction of pressure to target ONU, and notice feedback judge module 122 ' feed back judgement; Feedback judge module 122 ', be used for according to from instruction sending module 121 ' notice, judge whether OLT receives feedback information, when not receiving feedback information, notice detection module 13 target ONU continue luminous during this period of time in, detect luminous power from target ONU; When receiving feedback information, then notify configured bandwidth module 123 ' according to described id information, the configuration maximum bandwidth is given respective objects ONU: configured bandwidth module 123 ', be used for according to come self feed back judge module 122 ' notice, the configuration maximum bandwidth is given respective objects ONU, make target ONU continue luminous a period of time, and notice detection module 13 target ONU continue luminous during this period of time in, detect luminous power from target ONU.
Here, feedback information be meant ONU send to OLT, be used for showing and oneself do not accept to force the information of luminous command function.
The present invention also provides a kind of OLT side to detect the method for ONU luminous power, its core concept is: it is luminous continuously to control certain ONU, ONU continuously luminous during this period of time in, use the function of the detection luminous power that existing OLT optical module had itself, detect the luminous power that ONU sends over.
Fig. 4 detects the luminous power schematic diagram for OLT optical module among the present invention, as shown in Figure 4, OLT optical module inside provides testing circuit, and testing circuit can detect the luminous power that ONU sends over, but leaves electronic type clear program read-only memory (EEPROM) lining in.The OLT optical module provides general-purpose interface to other device of OLT side, it is inter-IC bus (IIC) interface, be made of three holding wires on the IIC interface hardware: first is the data wire IIC data of IIC interface, this holding wire is two-way, can send data to the EEPROM use of OLT optical module inside by CPU or CPLD (CPLD), as sending the EEPROM of commencing signal to OLT optical module inside by CP or CPLD, then CPU or CPLD begin to obtain own needed data from EEPROM, also can send the EEPROM of end signal to OLT optical module inside by CPU or CPLD, then CPU or CPLD stop to obtain data from EEPROM; Also can be sent data to CPU or CPLD by the EEPROM of OLT optical module inside uses, as will be by the detected luminous power storage from ONU of OLT optical module in the EEPROM of OLT optical module inside, EEPROM can the transmitting optical power data use for CPU or CPLD; Second is the clock cable IIC clock of IIC interface, this holding wire is unidirectional, send the EEPROM that clock (i.e. " 1 ", " 0 " replace level) is given OLT optical module inside by CPU on the OLT system single board or CPLD, this holding wire cooperates IIC data to finish the EEPROM reading of data from OLT optical module inside by CPU or CPLD, thereby notes CPU or the CPTD number from the EEPROM reading of data; The 3rd is earth connection, and effect is to show that testing circuit and EEPROM module are on the throne.Three holding wires all need connect and draw resistance, and the resistance of three pull-up resistors is identical, can be 4.7 kilo-ohms～10 kilo-ohms, and representative value is 4.7 kilo-ohms (promptly 3 * 4.7Kohm), and pull-up resistor connects 3.3 volts of voltages.
As shown in Figure 4, above-mentioned all devices all are positioned on the veneer of OLT side apparatus, the OLT optical module externally provides optical fiber interface, insert the ODN network by this interface, and ODN links to each other with ONU, so just can insert ONU, thereby the luminous power that ONU is sent to the OLT side is detected by this optical fiber interface.
Fig. 5 detects the realization flow figure of ONU luminous power for OLT side of the present invention.
As shown in Figure 5, suppose n ONU of this OLT condominium reason, be respectively 1,2 ..., n.
OLT is provided with target ONU, be the ONU1 registration herein, what is called is provided with the ONU1 registration, be that OLT distributes an ID to ONU1, ONU1 sends feedback information to OLT after receiving this ID, oneself accepted this ID to prove, so just can be so that ONU1 just can directly carry out the instruction of carrying this ID in the future.OLT is provided with ONU1 registration, and after other ONU is set does not register, can be so that other ONU be not luminous, thus make light signal that OLT receives in the future all from ONU1.
OLT is provided with the ONU1 registration time can send the instruction that stops to register to other ONU, this can make other ONU quit work, but can not have influence on ONU user, even because detected the luminous power that all ONU send over, the total time that is spent is also less than 0.1 second, time is extremely short, detects all ONU in the back that finishes and recovers normal operation, and ONU user is imperceptible at all.
This step is divided into two kinds of situations;
First kind of situation: OLT sends the configuration maximum bandwidth of carrying the luminous instruction of pressure of described id information or carrying described id information according to the configuration information of ONU1 and instructs to ONU1, make OLT control ONU1 continue luminous a period of time with this, execution in step 503 then.The configuration information of ONU can show the disposal ability of corresponding ONU, therefore, OLT can determine whether ONU supports forcing the execution of luminous instruction according to the configuration information of ONU, if ONU does not support forcing the execution of luminous instruction, then is that corresponding ONU configuration maximum bandwidth is so that corresponding ONU continues luminous.The configuration information of each ONU can be stored in OLT in advance.
Second kind of situation: OLT directly sends the luminous instruction of pressure of carrying described id information.
Here be divided into two kinds of situations again, first kind, direct execution in step 503; Second kind, ONU1 sends feedback information, tells the function that OLT oneself does not accept to force luminous instruction, then OLT send the configuration maximum bandwidth carry described id information instruction to ONU1, ONU1 continues luminous a period of time, execution in step 503 then.
Wherein, OLT forces the luminous time length of ONU1 to be determined according to the detection rates of OLT side OLT optical module and the speed of IIC interface.
Force the luminous instruction of ONU to provide, but not all ONU have the function of accepting this instruction by the PON OLT MAC chip of OLT side.If ONU1 has this function, can send the luminous instruction of pressure to it, ONU1 can be luminous continuously after receiving this instruction of carrying described id information; If ONU1 does not accept to force the function of luminous instruction, then after the configuration maximum bandwidth instruction of described id information is carried in its transmission, ONU1 accepts this instruction and is in basic luminance continuously, so-called " ONU is luminous substantially continuously " is meant, the OLT side is except the bandwidth that disposes certain ONU, the state of other ONU of checking that it is managed also requires a very short time, as check that whether other ONU state such as is connected with self disconnecting, calculate like this, in fact the bandwidth of distributing to this ONU does not reach maximum, probably can be assigned to 99% of maximum bandwidth value, but, this is enough for detecting luminous power.
ONU1 continue luminous during this period of time in, utilize the OLT optical module of OLT side to detect continuous light power from ONU1.
In like manner, for ONU2 ..., ONUn can repeat above-mentioned steps.Like this, just the luminous power from n ONU can be detected one by one and finish.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (9)
1. an optical line terminal OLT side detects the method for optical network unit ONU luminous power, it is characterized in that this method may further comprise the steps:
A, OLT are provided with target ONU registration, make described target ONU have the ID of self, other ONU is set does not simultaneously register;
B, OLT control described target ONU and continue luminous a period of time;
C, OLT detect the luminous power from described target ONU.
2. method according to claim 1 is characterized in that, described step B is: OLT forces luminous instruction or configuration maximum bandwidth to be instructed to target ONU according to the configuration information transmission of target ONU.
3. method according to claim 1 is characterized in that, described step B is: OLT sends and carries the luminous instruction of pressure of described id information to target ONU.
4. method according to claim 3 is characterized in that, further comprise after the described step B: OLT judges whether to receive feedback information,
If then the OLT configuration maximum bandwidth instruction that will carry described id information sends to target ONU, target ONU continues luminous a period of time;
If not, then do not operate.
5. according to each described method of claim 1 to 4, it is characterized in that: this method further comprises: repeat described steps A-step C, in the luminous power of OLT side detection from other target ONU.
6. method according to claim 1 is characterized in that, time length luminous described in the step C is determined according to the detection rates of OLT side OLT optical module and the speed of inter-IC bus IIC interface.
7. an OLT side detects the device of ONU luminous power, it is characterized in that this device comprises: Registering modules, control light emitting module, and detection module are set, wherein,
Registering modules is set, is used to be provided with target ONU registration, and notice control light emitting module controlled target ONU continues luminous a period of time;
The control light emitting module is used for according to from the described notice that Registering modules is set, and controlled target ONU continues luminous a period of time, and the notice detection module target ONU continue luminous during this period of time in, detection is from the luminous power of target ONU;
Detection module is used for according to the described notice from the control light emitting module, target ONU continue luminous during this period of time in, detect luminous power from target ONU.
8. device according to claim 7 is characterized in that, described control light emitting module comprises memory module and sending module, wherein,
Memory module is used to store the configuration information of all ONU, according to from the described notice that Registering modules is set, from the configuration information of self internal extraction target ONU, sends corresponding instruction according to the configuration information notice sending module of target ONU;
Sending module is used for sending and forcing luminous instruction or configuration maximum bandwidth to be instructed to target ONU according to from the described notice of memory module, and the notice detection module target ONU continue luminous during this period of time in, detect luminous power from target ONU.
9. device according to claim 7 is characterized in that, described control light emitting module comprises instruction sending module, feedback judge module, configured bandwidth module, wherein,
Instruction sending module is used for send and force luminous instruction to target ONU, and notice feedback judge module feeding back judgement according to from the described notice that Registering modules is set;
The feedback judge module is used for judging according to the described notice from instruction sending module whether OLT receives feedback information,
When receiving feedback information, notice configured bandwidth block configuration maximum bandwidth is given target ONU;
When not receiving feedback information, the notice detection module target ONU continue luminous during this period of time in, detect luminous power from target ONU;
The configured bandwidth module, be used for according to the described notice of coming the self feed back judge module, give respective objects ONU according to the id information of target ONU configuration maximum bandwidth, the notice detection module target ONU continue luminous during this period of time in, detect luminous power from target ONU.
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| CN101795158A (en) * | 2010-03-23 | 2010-08-04 | 中兴通讯股份有限公司 | Method and device for measuring receiving light power of light network unit |
| CN102325281B (en) * | 2011-07-18 | 2014-03-12 | 成都优博创技术有限公司 | Device and method for processing received signal strength indicator (RSSI) Trigger time sequence of optical module of optical line terminal (OLT) by utilizing programmable logic cell |
| CN102325281A (en) * | 2011-07-18 | 2012-01-18 | 成都优博创技术有限公司 | Device and method for processing received signal strength indicator (RSSI) Trigger time sequence of optical module of optical line terminal (OLT) by utilizing programmable logic cell |
| WO2015197011A1 (en) * | 2014-06-25 | 2015-12-30 | Huawei Technologies Co., Ltd. | Optical line terminal (olt) support of optical network unit (onu) calibration |
| US9768905B2 (en) | 2014-06-25 | 2017-09-19 | Futurewei Technologies, Inc. | Optical line terminal (OLT) support of optical network unit (ONU) calibration |
| RU2649317C1 (en) * | 2014-06-25 | 2018-04-02 | Хуавей Текнолоджиз Ко., Лтд. | Optical linear terminal (olt) with calibration of optical network unit (onu) |
| US10014974B2 (en) | 2014-06-25 | 2018-07-03 | Futurewei Technologies, Inc. | Optical line terminal (OLT) support of optical network unit (ONU) calibration |
| CN108809412A (en) * | 2018-06-01 | 2018-11-13 | 四川斐讯全智信息技术有限公司 | A kind of method, apparatus and system of test light communication products stability |
| CN110149564A (en) * | 2019-05-27 | 2019-08-20 | 太仓市同维电子有限公司 | Based on the luminous method of powerlevel function adjustment ONU |
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