CN110350970A - The test device and method of optical line terminal - Google Patents
The test device and method of optical line terminal Download PDFInfo
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- CN110350970A CN110350970A CN201910714789.XA CN201910714789A CN110350970A CN 110350970 A CN110350970 A CN 110350970A CN 201910714789 A CN201910714789 A CN 201910714789A CN 110350970 A CN110350970 A CN 110350970A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
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Abstract
The invention discloses a kind of test device of optical line terminal and method, which includes Error Detector, timing control plate, N number of optical network unit and optical attenuator, and Error Detector exports the continuous data of specific pattern；There is timing control plate signal to configure end group, and timing control plate configures the end group configuration output road N enable signal by signal；N number of optical network unit generates the road N class burst light according to the continuous data and the road N enable signal of specific pattern；Optical attenuator connects optical line terminal to be tested；Optical attenuator be conveyed to optical line terminal after class burst light in the road N is carried out optical attenuation so that N number of optical line terminal executes light detection work, and after work feedback characterization testing result level signal to timing control plate；Timing control plate receives the level signal that N number of optical line terminal executes the characterization testing result fed back after light detection work, and whether it is executed normally to judge N number of optical line terminal, and light detection works.Present invention reduces the testing costs of optical line terminal.
Description
Technical field
The present invention relates to product test field more particularly to a kind of test devices and method for optical line terminal.
Background technique
PON (Passive Optical Network: passive optical-fiber network) series of products OLT (OLT:Optical Line
Terminal, optical line terminal) when being tested, need to carry out burst performance test to product to be measured using error burst instrument.
In example technique as shown in Figure 1, error burst instrument configures burst signal BurstData, enable signal BEN by required timing
It is provided to ONU (Optical Network Unit, optical network unit), and on arrangement reset signal RST and light-receiving intensity
Report trigger signal RSSI_Trig is provided to OLT optical line terminal to be measured.Wherein, ONU optical network unit can make in the BEN
The class burst light of specific pattern all the way can be generated under the cooperation of signal, and bursty data is sent to optical attenuator, pass through adjusting
Optical attenuator can reduce/increase the optical power for being input to OLT optical line terminal.Then SD (Signal is observed on oscillograph
Detect, signal detection) whether signal normally alerts/goes alerts by signal or LOS (Loss of Signal, dropout).
Compared to conventional Error Detector, error burst instrument can directly generate burst optical signal and be tested, and realize conventional error code
The irrealizable function of instrument institute, and also have the function of others, so price of error burst instrument itself is higher, and also need
Oscillograph is wanted to assist, when being applied to producing line batch testing, higher cost.
Summary of the invention
The main object of the present invention is to propose a kind of test device of optical line terminal, it is intended to reduce the survey of optical line terminal
Try cost.
To achieve the above object, the invention proposes a kind of test devices of optical line terminal, for whole to N number of optical link
End is tested, and the test device of N >=1, the optical line terminal includes:
Error Detector, for exporting the continuous data of specific pattern；
Timing control plate, there is an at least signal to configure end group, and the timing control plate configures end group by the signal
The configurable output road N enable signal；
N number of optical network unit is communicated to connect with the Error Detector respectively, and is electrically connected with the timing control plate；N number of institute
State optical network unit, for receive the specific pattern continuous data and the road N described in enable signal, and according to the special code
Enable signal described in the continuous data of type and the road N generates the road N class burst light；
Optical attenuator, the input terminal of the optical attenuator are connect with N number of optical network unit optical fiber, the optical attenuator
Output end be the test interface connected for optical line terminal；The optical attenuator, for receiving the burst light of class described in the road N, and
It is conveyed to the optical line terminal after the burst light of class described in the road N is carried out optical attenuation, so that N number of optical line terminal executes light
Whether there is or not detection work, and after executing light whether there is or not detection work feedback characterization testing result the first level signal to the timing
Control panel；
The timing control plate receives N number of optical line terminal execution light, and whether there is or not the characterization detections fed back after detection work
As a result the first level signal, and N number of optical line terminal is judged whether it is executed normally light according to first level signal
Whether there is or not detection work.
In one embodiment, the timing control plate is strong by the configurable output road the N light-receiving of signal configuration end group
Degree reports trigger signal to N number of optical line terminal, carries out optical signal loss detection work to trigger N number of optical line terminal
Make, N number of optical line terminal carries out the second electrical level signal of feedback characterization testing result after signal loss detection work to institute
State timing control plate；
The timing control plate receives N number of optical line terminal and executes the characterization fed back after the work of optical signal loss detection
The second electrical level signal of testing result, and judge whether N number of optical line terminal is normally held according to the second electrical level signal
The work of traveling optical signal loss detection.
In one embodiment, when having the M optical line terminals in N number of optical line terminal is GPON type, institute
The optical line terminal for stating the configurable output road the M reset signal of signal configuration end group to the M GPON types, in the timing
Control panel according to first level signal determines optical line terminal whether it is executed normally the light of the M GPON type, and whether there is or not inspections
After surveying work, the optical line terminal of the M GPON types of triggering is resetted, and the M is more than or equal to 1, and is less than N.
In one embodiment, the timing control plate also has N number of test side group,
The timing control plate receives the first level of N number of optical line terminal feedback by N number of test side group
Signal or second electrical level signal；
The timing control plate by N number of test side group receive external equipment configuration the quasi- reference signal of N roadbed or
The quasi- reference signal of N roadbed of person itself configuration；
The timing control plate by received N number of first level signal and the reference signal on corresponding road into
Row compares, and whether there is or not detection work for whether it is executed normally to judge N number of optical line terminal light；
The timing control plate carries out the received second electrical level signal with the reference signal on corresponding road
Compare, optical signal loss detection work that whether it is executed normally to judge the optical line terminal on corresponding road.
In one embodiment, the timing control plate configures the end group configuration output road N reference letter by the signal
Number to the test side group.
In one embodiment, the signal configuration end group is 4 groups, and each signal configuration end group has 4 output ends
Mouthful,
4 output ports of each signal configuration end group can arbitrary disposition output at least all the way the enable signal,
The reset signal, all the way the light-receiving strength reporting trigger signal all the way；
The either output port of 4 output ports of each signal configuration end group may be additionally configured to export the benchmark
Reference signal；
The test side group have 2 input ports, wherein 1 input port be configured for first level signal or
The input of second electrical level signal, another input port are configured for the reference signal input.
To achieve the above object, the present invention also provides a kind of test methods of optical line terminal, are applied to a test macro
In, for testing N number of optical line terminal, N >=1, the test macro includes host and is separately connected with the host
Error Detector, timing control plate, optical network unit and optical attenuator, the optical network unit respectively with the Error Detector and timing
Control panel communication connection, the optical attenuator are connect with the optical network unit optical fiber, and are connected with optical line terminal to be tested
It connects；There is the timing control plate multiple groups signal to configure end group, and the test method of the optical line terminal includes:
The host receives the light of N number of optical line terminal whether there is or not when test instruction, controls the Error Detector and sends
The continuous data of specific pattern to optical network unit, and control the timing control plate by multiple groups signal configure end group configure it is defeated
The road N enable signal is to optical network unit out so that the optical network unit generated under the action of the enable signal of the road N N roadbed in
The class burst optical signal of the specific pattern is simultaneously sent to the optical attenuator；
The host controls optical attenuator class burst optical signal described in the road N according to the regulating command of setting and subtracts
Output is to N number of optical line terminal after small/increase is adjusted, so that N number of optical line terminal executes class burst light
Light detection work, so that N number of optical line terminal executes light, whether there is or not detection work, and anti-after executing light whether there is or not detection work
The first level signal of the road N of feedback characterization testing result is to the timing control plate；
The timing control plate receives N number of optical line terminal execution light, and whether there is or not the characterization detections fed back after detection work
As a result the first level signal of the road N, and the first level signal according to the road N judges whether N number of optical line terminal is normal
Executing light, whether there is or not detection work.
In one embodiment, when the optical signal that host receives N number of optical line terminal loses test instruction, control
The timing control plate configures the end group configuration output road N light-receiving strength reporting trigger signal to N number of light by signal
Road terminal carries out the work of optical signal loss detection to trigger N number of optical line terminal, and N number of optical line terminal carries out letter
The road the N second electrical level signal of feedback characterization testing result is to the timing control plate after the work of number loss detection；
The timing control plate receives N number of optical line terminal and executes the characterization fed back after the work of optical signal loss detection
The road the N second electrical level signal of testing result, and whether the second electrical level signal according to the road N judges N number of optical line terminal
It is normal to execute the work of optical signal loss detection.
In one embodiment, the host recognize have in N number of optical line terminal the road M be GPON type when, also control
The optical line terminal for making the timing control plate configuration output road the M reset signal to the GPON type, in the timing control
Making sheet according to first level signal determines optical line terminal whether it is executed normally the light of GPON type described in the road M, and whether there is or not detections
After work, the optical line terminal for triggering GPON type described in the road M is resetted；The M is more than or equal to 1, and is less than N.
In one embodiment, the timing control plate also has N number of test side group,
When the light that host receives N number of optical line terminal is instructed whether there is or not test or optical signal loses test instruction
When, control the timing control plate by the signal configure end group input external equipment configuration the quasi- reference signal of N roadbed or
Person itself configures the quasi- reference signal of N roadbed；
The timing control plate is believed by the first level that the test side group receives N number of optical line terminal feedback
Number or when second electrical level signal, the timing control plate joins the benchmark on received first level signal and corresponding road
It examines signal to be compared, whether there is or not detection work for whether it is executed normally to determine the optical line terminal on corresponding road light；
The timing control plate carries out the received second electrical level signal with the reference signal on corresponding road
Compare, optical signal loss detection work that whether it is executed normally to determine the optical line terminal on corresponding road.
In one embodiment, the signal configuration end group is 4 groups, and each signal configuration end group has 4 output ends
Mouthful；
When the test instruction that host receives optical line terminal is light whether there is or not when test instruction, the timing control plate passes through
Signal configures 4 output ports configuration output at least 1 tunnel enable signal of end group；
When the test instruction that host receives optical line terminal is that optical signal loses test instruction, the timing control plate
It is configured by signal and is notified in the 4 output ports configuration output at least 1 tunnel enable signal and 1 road received signal strength of end group
Number；
Wherein, if the optical line terminal is GPON type, in 4 tunnels be wherein configured to all the way reset signal export to
Optical line terminal.
In one embodiment, the either output port of 4 output ports of each signal configuration end group can also configure
To export the reference signal.
It in one embodiment, include control register in the timing control plate, the control register controls same letter
Number configuration end group multiple signals send simultaneously.
Technical solution of the present invention forms optical link by Error Detector, timing control plate, N number of optical network unit, optical attenuator
The test that traditional error burst instrument realizes optical line terminal is substituted in the test device of terminal, so that testing cost reduces, and
And timing control plate can configure output all the way or multichannel enable signal, then each optical network unit can receive enables letter all the way
Number with the continuous data of specific pattern and generate 1 tunnel class burst light, output makes to optical line terminal after being adjusted by optical attenuator
It obtaining 1 road optical line terminal and executes light detection work, optical line terminal reports signal to timing control plate to be alerted after sensing,
In this way without being observed by oscillograph, testing cost is reduced, also, when enable signal is multichannel, then optical network unit
It is correspondingly arranged as multichannel, to generate the test that multichannel class burst light realizes the optical line terminal of multichannel, in this way, just making the present invention
The test device of the line terminal of light, which can also be realized, tests multiple optical line terminals, it can realizes bulk survey
Examination, substantially reduces cost.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the circuit function module schematic diagram of an example technique of the test device of optical line terminal；
Fig. 2 is circuit function module schematic diagram of the present invention for one embodiment of test device of optical line terminal；
Fig. 3 is the circuit function module schematic diagram of another embodiment of test device for optical line terminal；
Fig. 4 is the method flow schematic diagram of one embodiment of test method of optical line terminal of the present invention；
Fig. 5 is the method flow schematic diagram of another embodiment of test method of optical line terminal of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
The main object of the present invention is to propose a kind of test device of optical line terminal, for N number of optical line terminal into
Row test, N >=1, expression can simultaneously test one or more optical line terminal, it is intended to reduce and use error burst
Instrument carries out the problem of bulk testing requirement of producing line.
Referring to Fig. 2 and Fig. 3, the test device of optical line terminal 400 proposed by the present invention includes:
Error Detector 100, for exporting the continuous data of specific pattern；
Timing control plate 500, there is an at least signal to configure end group, and the timing control plate 500 is matched by the signal
Set the configurable output road the N enable signal BEN of end group；
N number of optical network unit 200 is communicated to connect with the Error Detector 100 respectively, and electric with the timing control plate 500
Connection；N number of optical network unit 200, for receive the specific pattern continuous data and the road N described in enable signal BEN,
And the enable signal BEN according to the continuous data of the specific pattern and the road N generates the road N class burst light；I.e. each optical-fiber network
Unit 200 be used to receive the specific pattern continuous data and 1 tunnel described in enable signal BEN, and according to the specific pattern
Continuous data and 1 tunnel described in enable signal BEN generate 1 tunnel class happen suddenly light, N be it is how many, generate how many roads class burst light；
Optical attenuator 300, the input terminal of the optical attenuator 300 are connect with N number of 200 optical fiber of optical network unit, institute
The output end for stating optical attenuator 300 is the test interface connected for optical line terminal 400；The optical attenuator 300, for receiving
The burst light of class described in the road N, and it is conveyed to the optical line terminal 400 after the burst light of class described in the road N is carried out optical attenuation, so that N
A optical line terminal 400 executes light detection work, and the level of characterization testing result is fed back after executing light detection work
Signal is to the timing control plate 500；The adjusting of optical attenuator 300 is by electronic equipment or PC (Personal
Computer, PC) setting automatically controls, also, all equipment is connect with electronic equipment or PC, and it is unified to control
System, hereinafter referred to as host send test instruction and coherent signal by host, control the testing process of entire test device.
The timing control plate 500 receives N number of optical line terminal 400 and executes the characterization inspection fed back after light detection work
It surveys the level signal of result, and N number of optical line terminal 400 is determined whether it is executed normally light detection according to the level signal
Work.
In the present embodiment, Error Detector 100 is common continuous data Error Detector 100, and the specific pattern can be consecutive numbers
According to pseudo noise code, the burst signal that the error burst instrument 100 in example technique provides includes one section 1010 of lead code+standard
PRBS continuous data pattern, lead code for optical line terminal 400 receive threshold value establish and system clock recovery, the present embodiment
Then without lead code.Timing control plate 500 can (Field-Programmable Gate Array, i.e. scene can be compiled for FPGA
Journey gate array), it can also be CPLD, general processor, digital signal processor (DSP), specific integrated circuit (ASIC) or other
Programmable logic device.Optical network unit 200 is ONU (Optical Network Unit, optical network unit 200), optical link
Terminal 400 is OLT (OLT:Optical Line Terminal, optical line terminal 400).
It should be noted that the test of optical line terminal 400 mainly include the detection of optical line terminal 400 have light/unglazed and
Optical line terminal 400 detects whether optical signal is lost, and can only test one of situation as desired certainly.Wherein, it detects
When to no light, optical line terminal 400 can report level signal SD to timing control plate 500.Detected light, but optical signal compared with
It is weak, when intensity is inadequate, then optical signal loss detection signal LOS can be reported to timing control plate 500.
SD, Signal Detect signal detection: can represent whether detect optical signal with low and high level, work as optical link
When the optical signal power that terminal 400 receives is less than its internal a certain threshold value being arranged, it is unglazed for judging, and exports low level,
SD signal can be reported when no light.When the optical power received is greater than threshold value, high level is exported, releases SD alarm at this time.
LOS, Loss Of Signal dropout: when optical line terminal 400 receives optical signal power in the given time
Interior (such as 10us or longer) is always below the threshold value Pd (the corresponding BER >=10-3 of Pd) of a certain setting, then equipment enters LOS
State, optical module reports LOS signal at this time.When higher than threshold value, LOS alarm is released.
In having light/embodiment without light detection test, the optical attenuator 300, for receiving the burst of class described in the road N
Light, and it is conveyed to the optical line terminal 400 after the burst light of class described in the road N is carried out optical attenuation, so that N number of optical link is whole
End 400 executes light, and whether there is or not detection work, and whether there is or not the first level letters of feedback characterization testing result after detecting work executing light
Number to the timing control plate 500；The timing control plate 500 receives the N number of execution of the optical line terminal 400 light, and whether there is or not detections
First level signal of the characterization testing result fed back after work, and N number of light is judged according to first level signal
Whether there is or not detection work for whether it is executed normally the light of road terminal 400.In detail, the institute that each optical line terminal 400 will test
The optical signal power for stating class burst light is compared with respective internal optical signal power threshold value, in each optical line terminal
The optical signal power of 400 class burst light respectively detected is more than or equal to respectively internal optical signal power threshold value
When, output low level signal to the timing control plate 500；Described in respectively being detected in each optical line terminal 400
When the optical signal power of class burst light is less than the respectively optical signal power threshold value of inside, output high level signal to the timing control
Making sheet 500；When the timing control plate 500 receives low level signal, determine that whether there is or not inspections for the execution of optical line terminal 400 light
It surveys working properly；When receiving high level signal, determine that whether there is or not detection operation irregularities for the execution light of optical line terminal 400.
Host control the test device execution have light/without light detection test or detect optical signal whether lose test.
In the embodiment whether detection optical signal is lost, the timing control plate 500 configures end group by the signal
The configurable output road N light-receiving strength reporting trigger signal RSSI_Trig is N number of to trigger to N number of optical line terminal 400
The optical line terminal 400 carries out the work of optical signal loss detection, and N number of optical line terminal 400 carries out signal loss detection
The second electrical level signal of feedback characterization testing result is to the timing control plate 500 after work；The timing control plate 500 receives
N number of optical line terminal 400 executes the second electrical level signal for the characterization testing result fed back after the work of optical signal loss detection,
And N number of optical line terminal 400 is judged whether it is executed normally that optical signal loss detection works according to the second electrical level signal.
In detail, which is to judge that optical line terminal 400 receives optical signal power (such as 10us or more within the given time
It is long) it whether is always below the power threshold of a certain setting, then it is judged as that optical signal is lost if being, signal strength is weaker, no
It is then normal.
It should be noted that optical line terminal has GPON type and non-GPON type, GPON (Gigabit-Capable
PON) technology is the broadband passive light Integrated access standard based on ITU-TG.984.x standard.Above-mentioned test device can be used for surveying
Try the optical line terminal 400 of non-GPON type.When there is the M optical line terminals 400 to be in N number of optical line terminal 400
When GPON type, the optical link of the configurable road M reset signal RST to the M GPON types of output of signal configuration end group
Terminal 400, to determine the optical link of the M GPON types according to first level signal in the timing control plate 500
Whether it is executed normally the light of terminal 400 whether there is or not after detection work, answered by the optical line terminal 400 of the M GPON types of triggering
Position, the M is more than or equal to 1, and is less than N.Test is carried out to the optical line terminal 400 of GPON type to need to answer it
Bit manipulation may be implemented to test the optical line terminal 400 of GPON type through this embodiment.
In above-described embodiment, timing control plate 500 can do following configuration on hardware port: the timing control plate
500 have one or more signal configure end group, with configuration output all the way or multichannel (Group1, Group2, Group3,
Group4) the enable signal BEN.Accordingly, the timing control plate 500 also has N number of test side group IN, the timing control
Making sheet 500 receives the first level signal or second that N number of optical line terminal 400 is fed back by N number of test side group IN
Level signal；
When the light that host receives N number of optical line terminal 400 is instructed whether there is or not test or optical signal loses test
When instruction, controls the timing control plate 500 and joined by the N roadbed standard that N number of test side group IN receives external equipment configuration
Examine the quasi- reference signal IN_Trig of N roadbed of signal IN_Trig or itself configuration；
The timing control plate 500 believes received N number of first level signal with the reference on corresponding road
Number IN_Trig is compared, and whether there is or not detection work for whether it is executed normally to judge N number of optical line terminal 400 light；
The timing control plate 500 is by the reference signal of the received second electrical level signal and corresponding road
IN_Trig is compared, optical signal loss detection work that whether it is executed normally to judge the optical line terminal 400 on corresponding road
Make.
As shown in Figures 2 and 3, IN_Trig is a reference signal, is same BEN enable signal BEN/RST reset signal
RST has a standard signal source of logical interdependency, can be set and be generated by timing control plate 500, or by error burst instrument 100
Similar external equipment generates.The present embodiment is by by received first level signal or second electrical level signal and corresponding road
The reference signal IN_Trig is compared, and then is gone to determine and detected whether normally, the accuracy of detection to can be improved.
In one embodiment, the timing control plate 500 configures the end group configuration output road N reference by the signal
Signal IN_Trig to the test side group IN.The present embodiment, which can be each signal configuration end group, can export benchmark ginseng all the way
Examine signal IN_Trig.End group itself configuration baseline reference signal IN_Trig, which is configured, by signal is returned to test side group IN progress
Logical comparison does not need external equipment and provides reference signal, is further reduced equipment cost while improving detection accuracy.
In one embodiment, the signal configuration end group is 4 groups, and each signal configuration end group has 4 output ends
Mouthful, 4 output ports of each signal configuration end group can arbitrary disposition output at least the enable signal BEN, one all the way
Reset signal RST described in road, all the way the light-receiving strength reporting trigger signal RSSI_Trig.That is, the present embodiment
Timing control plate 500 has 16 output ports, if being used only for SD detection, can disposably realize 16 optical line terminals
400 test can disposably realize the test of 12 optical line terminals 400 if detecting for LOS, if being used for GPON class
The test of 2 optical line terminals 400 then may be implemented in type, i.e., each group can arbitrary disposition export 2 tunnels described in enable signal BEN,
Light-receiving strength reporting trigger signal RSSI_Trig described in reset signal RST, 1 tunnel described in 1 tunnel.
Certainly, the either output port of 4 output ports of each signal configuration end group may be additionally configured to output institute
Reference signal IN_Trig is stated, when using this embodiment, it is possible to reduce the configuration of enable signal BEN all the way vacates one
Port configures the reference signal IN_Trig.
Accordingly, the test side group IN has 2 input ports, wherein 1 input port is configured for first electricity
Ordinary mail number or the input of second electrical level signal, another input port are configured for the reference signal IN_Trig input.
In one embodiment, referring to shown in Fig. 3, timing control plate 500 is realized using FPGA, and interior includes control deposit
Device configures end group A1~A4, B1~B4, C1~C4, D1~D4, each group of 4 output ports, every group of port using 4 groups of signals
In each output port can that one page is defined in FPGA be total for sequence control signal (BEN/RST/RSSI_Trig) demand on time
It is custom-configured in the control register of 256byte.Wherein, the control register controls same signal configuration end group
Multiple signals are sent simultaneously, so guarantee that the analyses and comparison of signal are carried out in same period.
Specifically, the timing control plate 500 is configured with 4 group of 16 road output port, and it is quasi- that every group of output port exports 4 roadbeds
Reference signal IN_TrigIN_Trig signal, and, it is configured with 4 groups of input signal IN1~IN4；It should be noted that when described
Sequence control panel 500 also configures RSSI_Trig signal all the way and RST signal to optical line terminal 400, wherein RSSI_Trig signal
The inessential offer in SD signal testing, RSSI_Trig signal need to provide in LOS signal testing.In the optical line terminal 400
Test device in, remaining port can all be configured to BEN signal, if you do not need to can then leave unused, this test device is most
16 optical network units 200 can be connected to work, 16 optical network units 200 are controlled and shine to be surveyed to optical line terminal 400
Examination.
Please reference Fig. 3, the timing control plate 500 connected by the IN_Trig signal and multiple optical network units 200
It connects, the light network unit shown in the present embodiment is 4 groups, respectively optical network unit 1, ONU optical network unit 2, optical network unit 3
With optical network unit 4；The ONU optical network unit 1~4 is connect with an optical attenuator 300, and in the road N enable signal BEN signal
Under the action of, N roadbed is generated in the class burst light of specific pattern, the optical attenuator 300 of diagram is connect with optical line terminal 400,
And class burst light is received, the optical power for the optical line terminal 400 connecting with the optical attenuator 300 is adjusted, optical attenuator 300 has
Multiple signal processing channels, if not enough, number can also be increased, to realize the Signal Regulation to the class burst light of more multichannel.
When reception class burst light carries out detection work, the optical line terminal 400 can provide optical line terminal 400 according to detection case
SD signal or LOS signal reporting to FPGA, with it is real alert/go alert, 400 terminal of optical line terminal receives class burst light and carries out
Detection work simultaneously reports SD signal or LOS signal that existing technology realization can be used to FPGA, and details are not described herein again.
It is understood that passing through Error Detector 100, timing control plate 500, optical network unit 200,300 groups of optical attenuator
The test that traditional error burst instrument 100 realizes optical line terminal 400 is substituted at the test device of optical line terminal 400, makes
Testing cost reduces, and timing control plate 500 can configure output all the way or multichannel enable signal BEN, then each light
Network unit 200 can receive the continuous data of enable signal BEN all the way and specific pattern and generate 1 tunnel class burst light, pass through light
Output is to optical line terminal 400 after attenuator 300 is adjusted, so that 1 road optical line terminal 400 executes light detection work, optical link
Terminal 400 reports signal to timing control plate 500 to be alerted after sensing, in this way without being observed by oscillograph, subtracts
Few testing cost, also, when enable signal BEN is multichannel, then optical network unit 200 is correspondingly arranged as multichannel, more to generate
Class burst light in road realizes the test of the optical line terminal 400 of multichannel, in this way, filling the test of the line terminal of light of the present invention
Setting can also realize and test multiple optical line terminals 400, it can realize bulk test, substantially reduce cost.
It should be noted that error burst can only export burst optical signal all the way, therefore in the bulk survey for producing line
When examination, need using a large amount of error burst instrument 100, in the 100 higher situation of unit price of error burst instrument, testing cost is very
It is high.
The present invention also proposes a kind of test method of optical line terminal, is applied in a test macro, for N number of light
Road terminal is tested, N >=1, referring to Fig. 2 and Fig. 3, the test macro include host (not shown go out) and with the host point
Error Detector 100, timing control plate 500, N number of optical network unit 200 and the optical attenuator 300 not connected, N number of optical-fiber network list
Member 200 is communicated to connect with the Error Detector 100 and timing control plate 500 respectively, the optical attenuator 300 and N number of light net
The connection of 200 optical fiber of network unit, and connect with optical line terminal 400 to be tested；The timing control plate 500 has multiple groups signal
Configure end group.It should be noted that the test of optical line terminal 400 mainly include the detection of optical line terminal 400 have light/unglazed and
Optical line terminal 400 detects whether optical signal is lost, and can only test one of situation as desired certainly.Wherein, it detects
When to no light, optical line terminal 400 can report level signal SD to timing control plate 500.Detected light, but optical signal compared with
It is weak, when intensity is inadequate, then optical signal loss detection signal LOS can be reported to timing control plate 500.
SD, Signal Detect signal detection: can represent whether detect optical signal with low and high level, work as optical link
When the optical signal power that terminal 400 receives is less than its internal a certain threshold value being arranged, it is unglazed for judging, and exports low level,
SD signal can be reported when no light.When the optical power received is greater than threshold value, high level is exported, releases SD alarm at this time.
LOS, Loss Of Signal dropout: when optical line terminal 400 receives optical signal power in the given time
Interior (such as 10us or longer) is always below the threshold value Pd (the corresponding BER >=10-3 of Pd) of a certain setting, then equipment enters LOS
State, optical module reports LOS signal at this time.When higher than threshold value, LOS alarm is released.
In one embodiment, referring to Fig. 4, the test method of the optical line terminal includes:
Step S100, the light that host receives N number of optical line terminal 400 controls the mistake whether there is or not when test instruction
Code instrument 100 sends the continuous data of specific pattern to optical network unit 200, and controls the timing control plate 500 and pass through multiple groups
Signal configures the end group configuration output road N enable signal BEN to optical network unit 200, so that N number of optical network unit 200 is in N
N roadbed is generated under the action of the enable signal BEN of road in the class burst optical signal of the specific pattern and is sent to the optical attenuation
Device 300；Wherein, each optical network unit 200 be used for receive the specific pattern continuous data and 1 tunnel described in enable signal
BEN, and the enable signal BEN according to the continuous data of the specific pattern and 1 tunnel generate 1 tunnel class happen suddenly light, N be it is how many then
Generate how many roads class burst light；
Step S200, the described host controls the class described in the road N of optical attenuator 300 burst according to the regulating command of setting
Optical signal export after reducing/increasing adjusting to N number of optical line terminal 400, so that N number of optical line terminal 400
Light detection work is executed to class burst light, so that N number of optical line terminal 400 executes light, whether there is or not detection work, and
Executing light, whether there is or not the first level signals of the road N of feedback characterization testing result after detection work to the timing control plate 500；Light decay
The adjusting for subtracting device 300300 is automatically controlled by electronic equipment or PC (Personal Computer, PC) setting,
Also, all equipment are connect with electronic equipment or PC, are uniformly controlled, hereinafter referred to as host, are sent test by host and are referred to
Order and coherent signal, control the testing process of entire test device.
Step S300, the described timing control plate 500 receives N number of execution light of the optical line terminal 400, and whether there is or not detection work
The first level signal of the road N for the characterization testing result fed back afterwards, and the first level signal according to the road N judges N number of light
Whether there is or not detection work for whether it is executed normally for line terminal 400 light.
In detail, the optical signal power of each optical line terminal 400 will test class burst light and respectively
Internal optical signal power threshold value is compared, in the class burst light that each optical line terminal 400 respectively detects
Optical signal power when being more than or equal to respectively internal optical signal power threshold value, output low level signal to the timing control
Making sheet 500；It is less than in respectively in the optical signal power for the class burst light that each optical line terminal 400 respectively detects
When the optical signal power threshold value in portion, output high level signal to the timing control plate 500；The timing control plate 500 receives
When to low level signal, it is working properly whether there is or not detecting to determine that the optical line terminal 400 executes light；Receive high level signal
When, determine that whether there is or not detection operation irregularities for the execution light of optical line terminal 400.
In one embodiment, referring to Fig. 5, the test method of the optical line terminal further include:
Step S400, when the optical signal that host receives N number of optical line terminal 400 loses test instruction, control
The timing control plate 500 configures the end group configuration output road N light-receiving strength reporting trigger signal RSSI_Trig extremely by signal
N number of optical line terminal 400 carries out the work of optical signal loss detection to trigger N number of optical line terminal 400, N number of described
Optical line terminal 400 carry out signal loss detection work after feedback characterization testing result the road N second electrical level signal to it is described when
Sequence control panel 500；
Step S500, the described timing control plate 500 receives N number of optical line terminal 400 and executes optical signal loss detection
The road the N second electrical level signal for the characterization testing result fed back after work, and the second electrical level signal according to the road N judges N number of institute
State optical line terminal 400 whether it is executed normally the work of optical signal loss detection.
In detail, the embodiment be judge optical line terminal 400 receive optical signal power within the given time (such as
10us or longer) it whether is always below the power threshold of a certain setting, then it is judged as that optical signal is lost if being, signal strength
It is weaker, otherwise normally.
It should be noted that above-mentioned first level signal or second electrical level signal can be according to positive and negative different testing results
It is characterized using low level or high level.
It should be noted that optical line terminal has GPON type and non-GPON type, GPON (Gigabit-Capable
PON) technology is the broadband passive light Integrated access standard based on ITU-TG.984.x standard.Above-mentioned test device can be used for surveying
Try the optical line terminal 400 of non-GPON type.There is the road M for GPON when the host recognizes in N number of optical line terminal 400
When type, the optical link for also controlling the configuration of the timing control plate 500 output road M reset signal RST to the GPON type is whole
End 400, to determine that the optical link of GPON type described in the road M is whole according to first level signal in the timing control plate 500
Whether there is or not after detection work, the optical line terminal 400 for triggering GPON type described in the road M is resetted 400 whether it is executed normally light of end；
The M is more than or equal to 1, and is less than N.Test is carried out to the optical line terminal 400 of GPON type to need to reset it
Operation, may be implemented to test the optical line terminal 400 of GPON type through this embodiment.
In above-described embodiment, in order to improve detection accuracy, the timing control plate 500 also has N number of test side group IN,
When the light that host receives N number of optical line terminal 400 is instructed whether there is or not test or optical signal loses test
When instruction, the timing control plate 500 is controlled by the signal and configures the road the N reference that end group inputs external equipment configuration
Signal IN_Trig or itself configuration quasi- reference signal IN_Trig of N roadbed；
The timing control plate 500 receive that the N number of optical line terminal 400 feeds back by the test side group IN the
When one level signal or second electrical level signal, the timing control plate 500 is by received first level signal and corresponding road
The reference signal IN_Trig be compared, to determine the optical line terminal 400 on corresponding road, whether it is executed normally
Whether there is or not detection work for light；
The timing control plate 500 is by the reference signal of the received second electrical level signal and corresponding road
IN_Trig is compared, optical signal loss detection work that whether it is executed normally to determine the optical line terminal 400 on corresponding road
Make.Such as figure, IN_Trig is a reference signal, is that same BEN enable signal BEN/RST reset signal RST has logic related
Property a standard signal source, can be set and be generated by timing control plate 500, or the external equipment similar by error burst instrument 100
It generates.The present embodiment is by believing received first level signal or second electrical level signal with the reference on corresponding road
Number IN_Trig is compared, and then is gone to determine and detected whether normal, and the accuracy of detection can be improved.
In one embodiment, the timing control plate 500 configures the end group configuration output road N reference by the signal
Signal IN_Trig to the test side group IN.The present embodiment, which can be each signal configuration end group, can export benchmark ginseng all the way
Examine signal IN_Trig.End group itself configuration baseline reference signal IN_Trig is configured by signal to be carried out by returning to test side group IN
Compare, does not need external equipment and reference signal is provided, be further reduced equipment cost while improving detection accuracy.
In one embodiment, the signal configuration end group is 4 groups, and each signal configuration end group has 4 output ends
Mouthful；
When the test instruction that host receives optical line terminal 400 is that light is instructed whether there is or not test, the timing control plate
500 configure 4 output ports configuration output at least 1 tunnel enable signal BEN of end group by signal；
When the test instruction that host receives optical line terminal 400 is that optical signal loses test instruction, the timing control
Making sheet 500 exports at least 1 tunnel enable signal BEN by 4 output ports configuration that signal configures end group and 1 tunnel reception signal is strong
Degree reports signal；
Wherein, if the optical line terminal 400 is GPON type, it is wherein configured to RST signal output all the way in 4 tunnels
To optical line terminal 400.
That is, the timing control plate 500 of the present embodiment has 16 output ports, if being used only for SD detection,
It can disposably realize the test of 16 optical line terminals 400, if detecting for LOS, can disposably realize 12 optical links
If being used for GPON type the test of 2 optical module terminals then may be implemented, i.e., each group can arbitrarily match in the test of terminal 400
Set light-receiving strength reporting trigger signal described in enable signal BEN described in 2 tunnels of output, reset signal RST, 1 tunnel described in 1 tunnel
RSSI_Trig。
Certainly, the either output port of 4 output ports of each signal configuration end group may be additionally configured to output institute
Reference signal IN_Trig is stated, when using this embodiment, it is possible to reduce the configuration of enable signal BEN all the way vacates one
Port configures the reference signal IN_Trig.
Accordingly, the test side group IN has 2 input ports, wherein 1 input port is configured for first electricity
Ordinary mail number or the input of second electrical level signal, another input port are configured for the reference signal IN_Trig input.
In one embodiment, referring to shown in Fig. 3, timing control plate 500 is realized using FPGA, and interior includes control deposit
Device configures end group A1~A4, B1~B4, C1~C4, D1~D4, each group of 4 output ports, every group of port using 4 groups of signals
In each output port can that one page is defined in FPGA be total for sequence control signal (BEN/RST/RSSI_Trig) demand on time
It is custom-configured in the control register of 256byte.Wherein, the control register controls same signal configuration end group
Multiple signals are sent simultaneously, so guarantee that the analyses and comparison of signal are carried out in same period.
Specifically, the timing control plate 500 is configured with 4 group of 16 road output port, and it is quasi- that every group of output port exports 4 roadbeds
Reference signal IN_Trig signal, and, it is configured with 4 groups of input signal IN1~IN4；It should be noted that the timing control
Plate 500 also configures RSSI_Trig signal all the way and RST signal to optical line terminal 400, wherein RSSI_Trig signal is believed in SD
Inessential offer when number test, RSSI_Trig signal need to provide in LOS signal testing.In the test of the optical line terminal 400
In device, remaining port can all be configured to BEN signal, if you do not need to can then leave unused, this test device can at most be connected
16 optical network units 200 work, and control 16 optical network units 200 and shine to test optical line terminal 400.
It please should pass through the IN_Trig signal and multiple optical network units with continued reference to Fig. 3, the timing control plate 500
200 connections, the optical network unit 200 shown in the present embodiment are 4 groups, respectively optical network unit 1, optical network unit 2, optical-fiber network
Unit 3 and optical network unit 4；Optical network unit 1~4 and No. 4 optical attenuator 300 is connect, and in 4 tunnel enable signal BEN
Under the action of signal, 4 roadbeds are generated in the class burst light of specific pattern, the optical attenuator 300 and optical line terminal 400 of diagram connect
It connects, and receives class burst light, adjust the optical power for the optical line terminal 400 connecting with the optical attenuator 300, optical attenuator 300
With multiple signal processing channels, if not enough, number can also be increased, to realize the signal tune to the class burst light of more multichannel
Section.For optical line terminal 400 when reception class burst light carries out detection work, the optical line terminal 400 can be according to detection case
SD signal or LOS signal reporting are provided to FPGA, with it is real alert/go alert, 400 terminal of optical line terminal receives class and happens suddenly light
Carry out detection work and report SD signal or LOS signal that existing technology can be used to FPGA to realize that details are not described herein again.
It is understood that passing through Error Detector 100, timing control plate 500, optical network unit 200,300 groups of optical attenuator
The test that traditional error burst instrument 100 realizes optical line terminal 400 is substituted at the test device of optical line terminal 400, makes
Testing cost reduces, and timing control plate 500 can configure output all the way or multichannel enable signal BEN, then each light
Network unit 200 can receive the continuous data of enable signal BEN all the way and specific pattern and generate 1 tunnel class burst light, pass through light
Output is to optical line terminal 400 after attenuator 300 is adjusted, so that 1 road optical line terminal 400 executes light detection work, optical link
Terminal 400 reports signal to timing control plate 500 to be alerted after sensing, in this way without being observed by oscillograph, subtracts
Few testing cost, also, when enable signal BEN is multichannel, then optical network unit 200 is correspondingly arranged as multichannel, more to generate
Class burst light in road realizes the test of the optical line terminal 400 of multichannel, in this way, filling the test of the line terminal of light of the present invention
Setting can also realize and test multiple optical line terminals 400, it can realize bulk test, substantially reduce cost.
It should be noted that error burst can only export burst optical signal all the way, therefore in the bulk survey for producing line
When examination, need using a large amount of error burst instrument 100, in the 100 higher situation of unit price of error burst instrument, testing cost is very
It is high.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in scope of patent protection of the invention.
Claims (13)
1. a kind of test device of optical line terminal, for testing N number of optical line terminal, N >=1, which is characterized in that institute
The test device for stating optical line terminal includes:
Error Detector, for exporting the continuous data of specific pattern；
There is timing control plate an at least signal to configure end group, and the timing control plate, which configures end group by the signal, to match
Set the output road N enable signal；
N number of optical network unit is communicated to connect with the Error Detector respectively, and is electrically connected with the timing control plate；N number of light
Network unit, for receive the specific pattern continuous data and the road N described in enable signal, and according to the specific pattern
Enable signal described in continuous data and the road N generates the road N class burst light；
Optical attenuator, the input terminal of the optical attenuator are connect with N number of optical network unit optical fiber, the optical attenuator it is defeated
Outlet is the test interface connected for optical line terminal；The optical attenuator, for receiving the burst light of class described in the road N, and by the road N
Class burst light is conveyed to the optical line terminal after carrying out optical attenuation so that N number of optical line terminal execute light whether there is or not
Detect work, and after executing light whether there is or not detection work feedback characterization testing result the first level signal to the timing control
Plate；
The timing control plate receives N number of optical line terminal execution light, and whether there is or not the characterization testing results fed back after detection work
The first level signal, and according to first level signal judge N number of optical line terminal whether it is executed normally light whether there is or not
Detect work.
2. the test device of optical line terminal according to claim 1, which is characterized in that the timing control plate passes through institute
The configurable output road the N light-receiving strength reporting trigger signal of signal configuration end group is stated to N number of optical line terminal, to trigger N
A optical line terminal carries out the work of optical signal loss detection, and N number of optical line terminal carries out signal loss detection work
The second electrical level signal of feedback characterization testing result is to the timing control plate afterwards；
The timing control plate receives N number of optical line terminal and executes the characterization detection fed back after the work of optical signal loss detection
As a result second electrical level signal, and N number of optical line terminal is judged whether it is executed normally light according to the second electrical level signal
Signal loss detection work.
3. the test device of optical line terminal according to claim 1, which is characterized in that when N number of optical line terminal
In when to have M optical line terminals be GPON type, the configurable output road the M reset signal of signal configuration end group is to M
The optical line terminal of the GPON type, to be determined described in M in the timing control plate according to first level signal
The optical line terminal of GPON type whether it is executed normally light is whether there is or not after detection work, the optical link of the M GPON types of triggering
Terminal is resetted, and the M is more than or equal to 1, and is less than N.
4. the test device of optical line terminal according to claim 2, which is characterized in that the timing control plate also has
N number of test side group,
The timing control plate receives the first level signal of N number of optical line terminal feedback by N number of test side group
Or second electrical level signal；
The timing control plate by N number of test side group receive external equipment configuration the quasi- reference signal of N roadbed or from
The quasi- reference signal of N roadbed of body configuration；
The timing control plate compares received N number of first level signal with the reference signal on corresponding road
Compared with whether there is or not detection work for whether it is executed normally to judge N number of optical line terminal light；
The received second electrical level signal is compared by the timing control plate with the reference signal on corresponding road,
Optical signal loss detection work that whether it is executed normally to judge the optical line terminal on corresponding road.
5. the test device of optical line terminal according to claim 4, which is characterized in that the timing control plate passes through institute
The signal configuration end group configuration output quasi- reference signal of N roadbed is stated to the test side group.
6. the test device of optical line terminal according to claim 5, which is characterized in that the signal configuration end group is 4
Group, each signal configuration end group have 4 output ports,
4 output ports of each signal configuration end group can the arbitrary disposition output at least enable signal, all the way all the way
The reset signal, all the way the light-receiving strength reporting trigger signal；
The either output port of 4 output ports of each signal configuration end group may be additionally configured to export the reference
Signal；
The test side group has 2 input ports, wherein 1 input port is configured for first level signal or second
Level signal input, another input port are configured for the reference signal input.
7. a kind of test method of optical line terminal is applied in a test macro, for surveying to N number of optical line terminal
Examination, N >=1, the test macro includes host and the Error Detector being separately connected with the host, timing control plate, optical-fiber network list
Member and optical attenuator, the optical network unit are connect with the Error Detector and timing control board communications respectively, the optical attenuator
It connect with the optical network unit optical fiber, and is connect with optical line terminal to be tested；The timing control plate is believed with multiple groups
Number configuration end group, which is characterized in that the test method includes:
The host receives the light of N number of optical line terminal whether there is or not when test instruction, and it is specific to control the Error Detector transmission
The continuous data of pattern controls the timing control plate and configures end group configuration output N by multiple groups signal to optical network unit
Road enable signal is to optical network unit, so that the optical network unit generates N roadbed in described under the action of the enable signal of the road N
The class burst optical signal of specific pattern is simultaneously sent to the optical attenuator；
The host according to the regulating command of setting control optical attenuator class burst optical signal described in the road N reduce/
Increase and export after adjusting to N number of optical line terminal, so that N number of optical line terminal executes light inspection to class burst light
Work is surveyed, whether there is or not detection work so that N number of optical line terminal executes light, and the feedback form after executing light whether there is or not detection work
The first level signal of the road N of testing result is levied to the timing control plate；
The timing control plate receives N number of optical line terminal execution light, and whether there is or not the characterization testing results fed back after detection work
The first level signal of the road N, and the first level signal according to the road N judges N number of optical line terminal whether it is executed normally
Whether there is or not detection work for light.
8. the test method of optical line terminal according to claim 7, which is characterized in that
When the optical signal that host receives N number of optical line terminal loses test instruction, it is logical to control the timing control plate
Cross signal configuration end group configuration output the road N light-receiving strength reporting trigger signal to N number of optical line terminal, it is N number of to trigger
The optical line terminal carries out the work of optical signal loss detection, after N number of optical line terminal carries out signal loss detection work
The road the N second electrical level signal of feedback characterization testing result is to the timing control plate；
The timing control plate receives N number of optical line terminal and executes the characterization detection fed back after the work of optical signal loss detection
As a result the road N second electrical level signal, and the second electrical level signal according to the road N judges whether N number of optical line terminal is normal
Execute the work of optical signal loss detection.
9. the test method of optical line terminal according to claim 8, which is characterized in that
The host recognize have in N number of optical line terminal the road M be GPON type when, also control the timing control plate and match
The optical line terminal of the output road M reset signal to the GPON type is set, with electric according to described first in the timing control plate
Ordinary mail number determines that optical line terminal whether it is executed normally the light of GPON type described in the road M whether there is or not after detection work, triggers described in the road M
The optical line terminal of GPON type is resetted；The M is more than or equal to 1, and is less than N.
10. the test method of optical line terminal according to claim 9, which is characterized in that the timing control plate also has
There is N number of test side group,
When the light that host receives N number of optical line terminal is instructed whether there is or not test or when optical signal loses test instruction,
Control the timing control plate by the signal configure end group input external equipment configuration the quasi- reference signal of N roadbed or from
Body configures the quasi- reference signal of N roadbed；
The timing control plate by the test side group receive N number of optical line terminal feedback the first level signal or
When second electrical level signal, the timing control plate believes received first level signal with the reference on corresponding road
It number is compared, whether there is or not detection work for whether it is executed normally to determine the optical line terminal on corresponding road light；
The received second electrical level signal is compared by the timing control plate with the reference signal on corresponding road,
Optical signal loss detection work that whether it is executed normally to determine the optical line terminal on corresponding road.
11. the test method of optical line terminal according to claim 10, which is characterized in that the signal configures end group and is
4 groups, each signal configuration end group has 4 output ports；
When the test instruction that host receives optical line terminal is light whether there is or not when test instruction, the timing control plate passes through signal
Configure 4 output ports configuration output at least 1 tunnel enable signal of end group；
When the test instruction that host receives optical line terminal is that optical signal loses test instruction, the timing control plate passes through
4 output ports configuration output at least 1 tunnel enable signal of signal configuration end group and 1 road received signal strength report signal；
Wherein, if the optical line terminal is GPON type, the reset signal that is wherein configured to all the way in 4 tunnels is exported to light
Road terminal.
12. the test method of optical line terminal according to claim 11, which is characterized in that each signal configures end
The either output port of 4 output ports of group may be additionally configured to export the reference signal.
13. the test method of optical line terminal according to claim 7, which is characterized in that packet in the timing control plate
Control register is included, the control register controls multiple signals of same signal configuration end group while sending.
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