CN104660330A - Optical fiber access timing device with time delay measurement system - Google Patents
Optical fiber access timing device with time delay measurement system Download PDFInfo
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Abstract
The invention discloses an optical fiber access timing device with a time delay measurement system. The optical fiber access timing device is used for carrying out clock calibration on at least one indoor baseband unit by utilizing a global positioning and timing system, and comprises a near-end reception module, a far-end reception module and the time delay measurement system, wherein the rear-end reception module is used for receiving a global positioning and timing electric signal from the outside and converting into a timing optical signal; the far-end reception module is used for receiving the timing optical signal by an optical fiber from the near-end reception module and photoelectrically converting into a timing electric signal; the time delay measurement system is used for measuring the optical fiber time delay between the near-end reception module and the far-end reception module and transmitting to the corresponding indoor baseband unit through the far-end reception module to carry out clock calibration. According to the optical fiber access timing device, the time delay measurement system is used for automatically measuring the optical fiber time delay between the near-end reception module and the corresponding far-end reception module and transmitting to the corresponding indoor baseband processing unit, and the operation is simple.
Description
Technical field
The application is 201110150143.7 for application number, and the applying date is 06 month 03 day calendar year 2001, the divisional application of the application for a patent for invention that name is called " having the intelligent acess time service device of latency measurement system ".
The present invention relates to a kind of latency measurement technology, particularly relate to a kind of intelligent acess time service device with latency measurement system.
Background technology
In existing direct discharging station, a local module can communicate with multiple remote end module through optical fiber, indoor baseband processing unit (Building Base band unit, BBU) clock signal that clock utilizes far-end optical module global positioning system (Global Position System, the GPS) time dissemination system that proximally optical module receives to provide usually carries out synchronous calibration.
But, between near-end optical module and far-end optical module when optical fiber communication, inconvenient during length manual measurement due to optical fiber, therefore cannot optical-fiber time-delay be calculated, thus the local gps time signal of time signal and near-end optical module that BBU receives is asynchronous, cause this BBU cannot proper communication.
Summary of the invention
In view of this, the intelligent acess time service device providing a kind of measurement to have latency measurement system is easily necessary.
Have an intelligent acess time service device for latency measurement system, it is for utilizing global location time dissemination system to carry out clock alignment at least one indoor Base Band Unit.Described intelligent acess time service device comprises a near-end receiver module, at least one far-end receiver module and a latency measurement system.Described near-end receiver module is used for from external reception global location time service signal of telecommunication and carries out electro-optic conversion is time service light signal.At least one far-end receiver module described is used for receiving described time service light signal through optical fiber from described near-end receiver module and is the time service signal of telecommunication through opto-electronic conversion.Described latency measurement system for measure optical-fiber time-delay between described local module and corresponding at least one far-end receiver module described and by the optical-fiber time-delay of described calculating through at least one far-end receiver module described transfer to corresponding described at least one indoor Base Band Unit to carry out clock alignment; described latency measurement system comprises the 3rd measurement module and at least one the 3rd winding module, described 3rd measurement module device is in described near-end receiver module, at least one the 3rd winding module correspondence described is arranged at least one far-end receiver module described, described 3rd measurement module is from external reception global location time signal and transfer to described 3rd winding module after being converted to first wave length global location time service light signal, described 3rd winding module is back to described 3rd measurement module after the global location time service light signal of described first wave length is converted to the global location time service light signal of a second wave length and is converted to the global location time service signal of telecommunication, described in described 3rd measurement module Real-time Obtaining near-end receiver module receive the described global location time service signal of telecommunication pulse per second (PPS) and through described 3rd winding module passback the described global location time service signal of telecommunication pulse per second (PPS) and transfer to after calculating optical-fiber time-delay at least one far-end receiver module described in correspondence corresponding described at least one the 3rd winding module.
Compared with prior art, intelligent acess time service device provided by the invention measures optical-fiber time-delay between described near-end receiver module and at least one far-end receiver module described automatically by arranging latency measurement system, and time delay measures is transferred in corresponding indoor baseband processing unit and carry out clock alignment, simple to operate, ensure that the clock signal in indoor baseband processing unit is synchronous with global location time signal.
Accompanying drawing explanation
Fig. 1 is the module diagram with the intelligent acess time service device of latency measurement system that first embodiment of the invention provides.
Fig. 2 is the module diagram of the first winding module in the intelligent acess time service device of Fig. 1.
Fig. 3 is the module diagram of the first measurement module in the intelligent acess time service device of Fig. 1.
Fig. 4 is the module diagram with the intelligent acess time service device of latency measurement system that second embodiment of the invention provides.
Fig. 5 is the module diagram of the second winding module in the intelligent acess time service device of Fig. 4.
Fig. 6 is the module diagram of the second measurement module in the intelligent acess time service device of Fig. 4.
Fig. 7 is the module diagram with the intelligent acess time service device of latency measurement system that third embodiment of the invention provides.
Fig. 8 is the module diagram of the 3rd winding module in the intelligent acess time service device of Fig. 7.
Fig. 9 is the module diagram of the 3rd measurement module in the intelligent acess time service device of Fig. 7.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Refer to Fig. 1, the intelligent acess time service device 10 with latency measurement system of first embodiment of the invention, it is at least one indoor baseband processing unit (Building Baseband unit, BBU) 100 global location (Global Position System, hereafter and in accompanying drawing is called for short GPS) time dissemination system is utilized to carry out clock alignment.Described intelligent acess time service device 10 comprises a near-end receiver module 12, at least one far-end receiver module 14 and a first latency measurement system 16.Described near-end receiver module 12 is for from external reception global location time service signal of telecommunication and to carry out electro-optic conversion be time service light signal.At least one far-end receiver module 14 described is the time service signal of telecommunication for through optical fiber, proximally receiver module 12 receives described time service light signal and carries out opto-electronic conversion.Described first latency measurement system is for the optical-fiber time-delay measured between local module 12 and at least one far-end receiver module 14 and calculated optical-fiber time-delay is transferred at least one far-end receiver module 14.The time service signal of telecommunication of reception and described optical-fiber time-delay are transferred at least one corresponding indoor Base Band Unit (hereafter and in accompanying drawing being called for short BBU) 100 to carry out clock alignment by least one far-end receiver module 14.
First latency measurement system 16 comprises a first winding module 162 and first measurement module 164.In present embodiment, described first winding module 162 is arranged in near-end receiver module, and described first measurement module 164 is arranged at outside to be convenient for carrying.Be appreciated that measurement module 164 also can be set directly at least one corresponding remote end module 14.
Refer to Fig. 2, the first winding module 162 comprises at least one first combiner unit 1622, first electrooptic switching element 1624, first light wavelength division multiplexing 1626 and first photoelectric conversion unit 1628.Described first combiner unit 1622 comprises a filter 1622a, the first mixer 1622b and filter 1622c.First mixer 1622b, the first electrooptic switching element 1624, first light wave divide multiple device 1626 and the first photoelectric conversion unit 1628 and filter 1622c to be electrically connected formation loop checking installation successively, and filter 1622a and the first mixer 1622b is electrically connected in order to hold receiver module to be GPS time service electric signal transmission to the first mixer 1622b of f1 from a frequency of local reception nearly.In present embodiment, f1 is 1.5GHz.
Refer to Fig. 3, measurement module 164 comprises second light wavelength division multiplexing 1642, second photoelectric conversion unit 1643, first branching unit 1644, GPS time signal pulse per second (PPS) acquiring unit, 1645, quadrature modulation unit, 1646, second electrooptic switching element, 1647, quadrature demodulation unit 1648 and a first time-delay calculation unit 1649.
Described first branching unit 1644 comprises a splitter 1644a, a filter 1644b and filter 1644c.Described splitter 1644a is connected with described filter 1644b and described filter 1644c respectively.Described quadrature modulation unit 1646 comprises an a quadrature modulator 1646a and filter 1646b.
Described second light wavelength division multiplexing 1642, described second photoelectric conversion unit 1643, described splitter 1644a, described filter 1644b, a described GPS time signal pulse per second (PPS) acquiring unit 1645, described quadrature modulator 1646a, described filter 1646b and described second electrooptic switching element 1647 are electrically connected successively and form loop checking installation.Wherein, the output of a GPS time signal pulse per second (PPS) acquiring unit 1645 is also electrically connected with an input of the first time-delay calculation unit 1649.Another output of splitter 1644a and described filter 1644c, described quadrature demodulation unit 1648 and described first time-delay calculation unit 1649 are electrically connected successively.
The first frequency GPS time service signal of telecommunication that near-end receiver module 12 receives transfers to the GPS time service light signal that the first electrooptic switching element 1624 is converted to first wave length after filter 1622a and the first mixer 1622b, first light wavelength division multiplexing 1626 is by the second light wavelength division multiplexing 1642 of GPS time service optical signal transmission to the first measurement module 164 of first wave length, in present embodiment, first wave length is 1310nm.
Second photoelectric conversion unit 1643 receives the GPS time service light signal of first wave length from described second light wavelength division multiplexing 1642 and is converted into the first frequency GPS time service signal of telecommunication, transfers to a GPS time signal pulse per second (PPS) acquiring unit 1645 through splitter 1644a and filter 1644b.One GPS time signal pulse per second (PPS) acquiring unit 1645 transfers to quadrature modulator 1646a and the first time-delay calculation unit 1649 after the GPS time service signal of telecommunication of first frequency is converted to pps pulse per second signal respectively.The modulation of first frequency GPS time service pps pulse per second signal is filtered into the GPS time service signal of telecommunication of second frequency f2 and transfers to the second electrooptic switching element 1647 by quadrature modulator 1646a and filter 1646b.Be appreciated that f1 and f2 is not identical, the large I of frequency needs oneself to set according to user.In present embodiment, second frequency is 800MHz.
Be back to the first light wavelength division multiplexing 1626 of the first winding module 162 through the second light wavelength division multiplexing 1642 after the second frequency GPS time service signal of telecommunication is converted to the GPS time service light signal of second wave length by the second electrooptic switching element 1647.Be appreciated that second wave length and first wave length are not identical, in present embodiment, second wave length is 1550nm.
First photoelectric conversion unit 1628 of the first winding module 162 receives the GPS time service light signal of the second wave length of passback and is converted into the GPS time service signal of telecommunication from the first light wavelength division multiplexing 1626, after filter 1622c filtering, obtain the GPS time service signal of telecommunication of second frequency and transfer to the first mixer 1622a and the first frequency GPS time service signal of telecommunication carries out conjunction road, it is the second light wavelength division multiplexing 1642 transferring to measurement module 164 after the conjunction road time service light signal of first wave length through the first light wavelength division multiplexing 1626 that time service electric signal transmission to the first electrooptic switching element 1624 behind Bing Jianghe road carries out electro-optic conversion.
Conjunction road time service optical signal transmission to the second photoelectric conversion unit 1643 of first wave length is carried out opto-electronic conversion for closing the road time service signal of telecommunication by the second light wavelength division multiplexing 1642, then after splitter 1643 and filter 1644c filtering, obtains the second frequency GPS time service signal of telecommunication and transfer to quadrature demodulation unit 1648 carrying out demodulation.Quadrature demodulation unit 1648 transfers to the first time-delay calculation unit 1649 by after second frequency GPS time service signal of telecommunication demodulation GPS time service pps pulse per second signal.
First time-delay calculation unit 1649 obtains GPS time service pps pulse per second signal from a GPS time signal acquiring unit 1645 in real time and obtains GPS time service pps pulse per second signal from quadrature demodulation unit 1648, calculate the time delay difference T1 between two pps pulse per second signals, and after deducting the hardware time delay T0 of intelligent acess time service device 10, obtain the round trip propagation delay time (T1-T0) of time service fiber-optic signal through optical fiber, the one way time delay (T1-T0)/2 of optical fiber is again divided by 2, this one way time delay is transferred at least one indoor Base Band Unit described in correspondence to carry out clock alignment through at least one far-end receiver module 14.
Be appreciated that hardware time delay T0 can according to the module control unit of the time delay desired value of each hardware cell in measurement module 164 as preset in microcontrol processor (Micro Control Unit, MCU).Be appreciated that the value of general T0 can be ignored, T0 is set to 0.
Be appreciated that the global location time signal in present embodiment can also be big dipper clock signal.
Refer to Fig. 4, it is the module diagram of the intelligent acess time service device 20 of second embodiment of the invention, and it is for carrying out clock alignment at least one BBU200.Intelligent acess time service device 20 comprises a near-end receiver module 22, at least one far-end receiver module 24 and a second latency measurement system 26.Intelligent acess time service device 20 is roughly the same with the structure of the near-end receiver module in the intelligent acess time service device 10 of the first execution mode and far-end receiver module, and difference is that latency measurement system is different.
Described second latency measurement system 26 comprises a second winding module 262 and second measurement module 264.Described second winding module 262 is arranged in near-end receiver module 22, and described second measurement module 264 is arranged at outside to be convenient for carrying.Be appreciated that measurement module 264 also can be set directly at least one corresponding remote end module 24.
Refer to Fig. 5, the second winding module 262 comprises the 3rd electrooptic switching element 2622, the 3rd light wavelength division multiplexing 2624, the 3rd photoelectric conversion unit 2626, filter 2628 and the 4th photoelectric conversion unit 2629.3rd light wavelength division multiplexing 2624, the 3rd photoelectric conversion unit 2626, filter 2628 and the 4th photoelectric conversion unit 2629 are electrically connected successively and form loop checking installation, and the 3rd electrooptic switching element 2622 and the 3rd light wavelength division multiplexing 2624 local frequency be electrically connected for holding receiver module 22 to receive nearly is that the gps signal of f1 exports the 3rd light wavelength division multiplexing 2624 to.In present embodiment, f1 is 1.5GHz.
Refer to Fig. 6, the second measurement module 264 comprises the 4th light wavelength division multiplexing 2642, the 4th photoelectric conversion unit 2643, second branching unit 2644 and the 5th electrooptic switching element 2645, the 2nd GPS time signal pulse per second (PPS) acquiring unit, 2646, the 5th photoelectric conversion unit, 2647, the 3rd GPS time signal pulse per second (PPS) acquiring unit 2648 and a second time-delay calculation unit 2649.
4th photoelectric conversion unit 2643, second branching unit 2644, the 5th electrooptic switching element 2645 and the 4th light wavelength division multiplexing 2642 are electrically connected successively and form loop checking installation, and another output of the second branching unit 2644 and an input of the 2nd GPS time signal pulse per second (PPS) acquiring unit 2646 and the second time-delay calculation unit 2649 are electrically connected successively.Another input of another output of 4th light wavelength division multiplexing 2642 and the 5th photoelectric conversion unit 2647, the 3rd GPS time signal pulse per second (PPS) acquiring unit 2648 and the second time-delay calculation unit 2649 is electrically connected successively.
Be appreciated that, for making the signal quality inputing to the 3rd GPS time signal pulse per second (PPS) acquiring unit 2648 from the 5th photoelectric conversion unit 2647 better, the second measurement module 264 also comprises a filter 2460, described filter 2640 is arranged on the 5th photoelectric conversion unit 2647 and between the 3rd GPS time signal pulse per second (PPS) acquiring unit 2648.
The frequency that near-end receiver module 22 receives is the GPS time service signal of telecommunication of f1 is converted to first wave length GSP time service light signal through the 3rd electrooptic switching element 2622, and after the 3rd light wavelength division multiplexing 2624, transfer to the 4th light wavelength division multiplexing 2642 of the second measurement module 264.In the present embodiment, first wave length is 1310nm.
It is transfer to described second branching unit 2644 after the GPS time service signal of telecommunication that the GPS time service optical signal transmission of first wave length to the 4th photoelectric conversion unit 2643 is carried out opto-electronic conversion by the 4th light wavelength division multiplexing 2642.The GPS time service signal of telecommunication of transmission is divided into the two-way GPS time service signal of telecommunication by the second branching unit 2644, the one road GPS time service signal of telecommunication carries out through the 5th electrooptic switching element 2645 the GPS time service light signal that electro-optic conversion is a second wave length, and is back to the 3rd light wavelength division multiplexing 2624 of the second winding module 262 through the 4th light wavelength division multiplexing 2642.Another road GPS time service signal of telecommunication that second branching unit 2644 separates transfers to the second time-delay calculation unit 2649 after the 2nd GPS time signal pulse per second (PPS) acquiring unit 2646 obtains pulse per second (PPS).Be appreciated that first wave length is different from second wave length, in present embodiment, second wave length is 1550nm.
3rd light wavelength division multiplexing 2624 receives the GPS time service light signal of second wave length from the 4th light wavelength division multiplexing 2642 and transfers to the 3rd photoelectric conversion unit 2626 to carry out opto-electronic conversion be the GPS time service signal of telecommunication, transfers to the 4th electrooptic switching element 2629 after filter 2626 filtering.Transfer to the 4th light wavelength division multiplexing 2642 of the second measurement module 264 through the 3rd light wavelength division multiplexing 2624 after the GPS time service signal of telecommunication is converted to the GPS time service light signal of three-wavelength by the 4th electrooptic switching element 2629.It is the GPS time service signal of telecommunication that GPS time service optical signal transmission to the 5th photoelectric conversion unit 2647 that the GPS time service signal of telecommunication is converted to three-wavelength by the 4th electrooptic switching element 2629 carries out opto-electronic conversion, transfers to the 3rd GPS time signal pulse per second (PPS) acquiring unit 2648 after filter 2640 filtering.Be appreciated that three-wavelength is different from first wave length and second wave length respectively, in present embodiment, three-wavelength is 1510nm.
The real-time pulse per second (PPS) from the 2nd GPS time signal acquiring unit 2646 Real-time Obtaining GPS time service signal of telecommunication and obtain the pulse per second (PPS) of the GPS time service signal of telecommunication from the 3rd GPS time signal pulse per second (PPS) acquiring unit 2648 respectively of second time-delay calculation unit 2649, and the time delay difference T2 calculated between two pps pulse per second signals, and obtain the round trip propagation delay time (T2-T0) of time service fiber-optic signal through optical fiber after deducting the hardware time delay T0 of winding module 262 and measurement module 264, the one way time delay (T2-T0)/2 of optical fiber is again divided by 2, this one way time delay is transferred at least one BBU200 described in correspondence to carry out clock alignment through at least one far-end receiver module 24.
Be appreciated that hardware time delay T0 can according to the module control unit of the time delay desired value of each hardware cell in measurement module 264 as preset in microcontrol processor (Micro Control Unit, MCU).Be appreciated that the value of general T0 can be ignored, T0 is set to 0.
Be appreciated that the global location time signal in present embodiment can also be big dipper clock signal.
Refer to Fig. 7, it is the module diagram of the intelligent acess time service device 30 of third embodiment of the invention, and it is for carrying out clock alignment at least one BBU300.Intelligent acess time service device 3 comprises a near-end receiver module 32, at least one far-end receiver module 34 and a time delay measuring system 36.Roughly the same with the near-end receiver module of the intelligent acess time service device 10 of the first execution mode and the structure of far-end receiver module in intelligent acess time service device 30, difference is that latency measurement system is different.
Described latency measurement system 36 comprises at least one the 3rd winding module 362 and the 3rd measurement module 364.At least one the 3rd winding module 362 correspondence described is arranged at least one far-end receiver module 34, and described 3rd measurement module 364 is arranged in near-end receiver module 32.
Refer to Fig. 8,3rd measurement module 364 comprises the 4th branching unit 3640, second combiner unit 3642, the 6th electrooptic switching element 3643, the 5th light wavelength division multiplexing 3644, the 6th photoelectric conversion unit 3645, the 4th GPS time signal pulse per second (PPS) acquiring unit, 3646, the 5th GPS time signal pulse per second (PPS) acquiring unit, 3647, the 3rd time-delay calculation unit 3648 and the first frequency shift keying (Frequency-shift keying, hereafter and in accompanying drawing is called for short FSK) modulation/demodulation unit 3649.Described 4th branching unit 3640 comprises an a splitter 3640a and filter 3640b.Described second combiner unit 3642 comprises an a coupler 3642a and filter 3642b.
Be appreciated that, for making the signal quality inputing to the 4th GPS time signal pulse per second (PPS) acquiring unit 3646 from the 6th photoelectric conversion unit 3645 better, 3rd measurement module 364 also comprises a filter 365, and described filter 3645 is arranged between the 6th photoelectric conversion unit 3645 and the 4th GPS time signal pulse per second (PPS) acquiring unit 3646.
Splitter 3640a, filter 3640b, coupler 3642a, 6th electrooptic switching element 3643, 5th light wavelength division multiplexing 3644, 6th photoelectric conversion unit 3645, filter 365, an input of the 4th GPS time signal pulse per second (PPS) acquiring unit 3646 and the 3rd time-delay calculation unit 2648 is electrically connected successively, another output of 4th branching unit 3640, 5th GPS time signal pulse per second (PPS) acquiring unit 3647, another input of 3rd time-delay calculation unit 2648, an input of the first shift keying modulation/demodulating unit 3649, another input of filter 3642b and coupler 3642 is electrically connected successively.
Refer to Fig. 9,3rd winding module 362 comprises the 6th light wavelength division multiplexing 3622, the 7th photoelectric conversion unit 3624, the 6th branching unit 3625, the 7th branching unit 3626, the 7th electrooptic switching element 3627 and the second frequency shift keying (Frequency-shiftkeying hereafter and in accompanying drawing is called for short FSK) modulation/demodulation unit 3628.Described 6th branching unit 3625 comprises splitter 3625a, filter 3625b and filter 3625c.Described 7th branching unit 3626 comprises a splitter 3626a and filter 3626b.
6th light wavelength division multiplexing 3622, the 7th branching unit 3626, splitter 3625a, filter 3625b, splitter 3626a, filter 3626b and the 7th photoelectric conversion unit 3624 are electrically connected to form loop checking installation successively.Another transmission ends of splitter 3625a is electrically connected through filter 3625c and the 2nd FSK modulation/demodulation unit 3628.
The frequency that near-end receiver module 32 receives is that the GPS time service signal of telecommunication of f1 transfers to coupler 3642a after splitter 3640a and filter 3640b shunt, and is converted to the GPS time service light signal of first wave length through the 6th electrooptic switching element 3643.5th light wavelength division multiplexing 3644 by the GPS time service optical signal transmission of first wave length to the 6th light wavelength division multiplexing 3622 of the 3rd winding module 362.In present embodiment, f1 is 1.5GHz.In present embodiment, first wave length is 1310nm.
7th photoelectric conversion unit 3624 transfers to splitter 3625a shunt and transfer to splitter 3626a after filter 3625b filtering and is divided into two-way time signal after the GPS time service light signal of first wave length is converted to the GPS time service signal of telecommunication.The road GPS time service signal of telecommunication that splitter 3626a separates transfers to the 7th electrooptic switching element 3627 and carries out the GPS time service light signal that electro-optic conversion is second wave length after filter 3626b filtering, and being back to the 3rd measurement module 364 through the 6th light wavelength division multiplexing 3622, another road GPS time service electric signal transmission that splitter 3626a separates is to corresponding BBU.Be appreciated that second wave length is different from first wave length, in present embodiment, second wave length is 1550nm.
It is the GPS time service signal of telecommunication that 5th light wavelength division multiplexing 3644 carries out opto-electronic conversion through the 6th photoelectric conversion unit 3645 after receiving the GPS time service light signal of the second wave length of passback, and after filter 365 filtering, transfer to the 4th GPS time signal pulse per second (PPS) acquiring unit 3646.
3rd time-delay calculation unit 3648 is real-time respectively to be obtained the pulse per second (PPS) of GPS time signal from the 4th GPS time signal pulse per second (PPS) acquiring unit 3646 and obtains the pulse per second (PPS) of GPS time signal from the 5th GPS time signal pulse per second (PPS) acquiring unit 3647, and the time delay difference T3 calculated between two pps pulse per second signals, and after deducting winding module 362 and the hardware time delay T0 of measurement module 364 authorized light signal through the round trip propagation delay time (T3-T0) of optical fiber, the one way time delay (T3-T0)/2 of optical fiber is again divided by 2, this one way time delay is transferred at least one BBU300 described in correspondence to carry out clock alignment through at least one far-end receiver module 34.
The GPS time service signal of telecommunication that the optical-fiber time-delay of calculating transmits with filter 3640b by the 3rd time-delay calculation unit 3648 after a FSK modulation/demodulation unit 3649 is modulated transfers to the 6th electrooptic switching element the 3643, six electrooptic switching element 3643 through coupler 3642a and will close the 6th light wavelength division multiplexing 3622 transferring to the 3rd winding module 362 after road signal is converted to the light signal of first wave length through the 5th wavelength division multiplexer 3644.It is transfer to splitter 3625a after the signal of telecommunication to be divided into two paths of signals that conjunction road optical signal transmission to the 7th photoelectric conversion unit 3624 is carried out opto-electronic conversion by the 6th light wavelength division multiplexing 3622, optical-fiber time-delay Signal transmissions to the 2nd FSK modulation/demodulation unit 3628 to be carried out demodulation demodulating optical-fiber time-delay information transmission that the 3rd time-delay calculation unit 3648 calculates to carry out clock alignment to corresponding BBU through filter 3625c by the one road signal of telecommunication, and another road signal of telecommunication transfers to splitter 3626a after filter 3625b filtering.
Be appreciated that hardware time delay T0 can, according to the time delay desired value of each hardware cell in measurement module 364, also be that the module control unit in near-end receiver module 32 is preset as microcontrol processor (MicroControl Unit, MCU) is interior.Be appreciated that the value of general T0 can be ignored, T0 is set to 0.
Be appreciated that, for making the timely feedback information of at least one far-end receiver module 34 energy to inform whether near-end receiver module 32 receives Delay, 3rd measurement module 364 also comprises the 5th branching unit the 366, a three winding module and also comprises the 3rd combiner unit 3620.
In present embodiment, 5th branching unit 366 comprises a coupler 366a and filter 366b, wherein, 6th photoelectric conversion unit 3645, coupler 366a and filter 365 are electrically connected successively, and another output of coupler 366a is electrically connected through filter 366b and a FSK modulation/demodulation unit 3649.
In present embodiment, described 3rd combiner unit 3620 comprises an a filter 3620a and coupler 3620b, wherein, filter 3626b, coupler 2620b and the 7th electrooptic switching element 3627 are electrically connected successively, and the 2nd FSK modulation/demodulation unit 3628 is electrically connected through another input of filter 3620a and coupler 3620b.
The GSP time signal that feedback information and filter 3626b export by the 2nd FSk modulation/demodulation unit 3628 closes through coupler 3620b and transfers to the 7th electrooptic switching element 3627 behind road and carry out the light signal that electro-optic conversion is second wave length, the 6th light wavelength division multiplexing 3622 by the conjunction road optical signal transmission of second wave length to the 5th light wavelength division multiplexing 3644 of the 3rd measurement module 364.The conjunction road optical signal transmission of second wave length to the 6th photoelectric conversion unit 3645 is carried out opto-electronic conversion for closing the road signal of telecommunication by the 5th light wavelength division multiplexing 3644, and coupler 366a and filter 366b separates transmission of feedback information to a FSK modulation/demodulation unit 3649 and carries out demodulation to obtain the notification whether received of feedback from the signal of telecommunication of conjunction road.
Be appreciated that, for making the measurement that can realize Automated condtrol optical-fiber time-delay between the 3rd winding module 362 and the 3rd measurement module 364, the 3rd winding module 362 also comprises a switch element 368, splitter 3626a, described switch element 368 and filter 3626b and is electrically connected successively.When switch element 368 is opened, the 3rd measuring system 36 starts the measurement carrying out optical-fiber time-delay, and when switch element 368 is closed, measuring system 36 does not carry out the measurement of optical-fiber time-delay.Be appreciated that user can measure the On/Off needing to be carried out control switch unit 368 by the module control unit at least one remote end module 36 successively.
Be appreciated that, intuitively user can be shown to for making the measurement result of optical-fiber time-delay, described intelligent acess time service device also can arrange a display unit, and described display unit is used for the optical-fiber time-delay between the described local module of described latency measurement systematic survey and at least one far-end receiver module described to show.
Be appreciated that, 3rd winding module 362 also can be arranged in near-end receiver module 32,3rd measurement module 364 correspondence is arranged at least one far-end receiver module 34, directly transfers at least one corresponding BBU and carry out clock alignment in the 3rd measurement module 364 after calculating optical-fiber time-delay.
Be appreciated that the global location time signal in present embodiment can also be big dipper clock signal.
Intelligent acess time service device measures optical-fiber time-delay between near-end receiver module and at least one corresponding far-end receiver module automatically by arranging latency measurement system, and time delay measures is transferred in corresponding indoor baseband processing unit and carry out clock alignment, simple to operate, ensure that the clock signal in indoor baseband processing unit is synchronous with global location time signal.
Be understandable that, for the person of ordinary skill of the art, other various corresponding change and distortion can be made by technical conceive according to the present invention, and all these change the protection range that all should belong to the claims in the present invention with distortion.
Claims (6)
1. have an intelligent acess time service device for latency measurement system, it is for utilizing global location time dissemination system to carry out clock alignment at least one indoor Base Band Unit, and described intelligent acess time service device comprises:
A near-end receiver module, it is for from external reception global location time service signal of telecommunication and to carry out electro-optic conversion be time service light signal;
At least one far-end receiver module, it is for receiving described time service light signal through optical fiber from described near-end receiver module and be the time service signal of telecommunication through opto-electronic conversion;
A latency measurement system, its for measure described local module with corresponding described in optical-fiber time-delay between at least one far-end receiver module and by calculated optical-fiber time-delay through described at least one far-end receiver module transfer to corresponding described at least one indoor Base Band Unit to carry out clock alignment;
Described latency measurement system comprises the 3rd measurement module and at least one the 3rd winding module, described 3rd measurement module device is in described near-end receiver module, at least one the 3rd winding module correspondence described is arranged at least one far-end receiver module described, described 3rd measurement module is from external reception global location time signal and transfer to described 3rd winding module after being converted to first wave length global location time service light signal, described 3rd winding module is back to described 3rd measurement module after the global location time service light signal of described first wave length is converted to the global location time service light signal of a second wave length and is converted to the global location time service signal of telecommunication, described in described 3rd measurement module Real-time Obtaining near-end receiver module receive the described global location time service signal of telecommunication pulse per second (PPS) and through described 3rd winding module passback the described global location time service signal of telecommunication pulse per second (PPS) and transfer to after calculating optical-fiber time-delay at least one far-end receiver module described in correspondence corresponding described at least one the 3rd winding module.
2. intelligent acess time service device as claimed in claim 1, it is characterized in that, described 3rd measurement module comprises the 4th branching unit, 6th electrooptic switching element, 5th light wavelength division multiplexing, described 3rd winding module comprises the 6th light wavelength division multiplexing, 7th photoelectric conversion unit, 6th branching unit and the 7th electrooptic switching element, the global location time service signal of telecommunication that described near-end receiver module receives transfers to the global location time service light signal that described 6th electrooptic switching element is converted to first wave length in a road after described 4th branching unit shunt, described 5th light wavelength division multiplexing by the global location time service optical signal transmission of described first wave length to the 6th light wavelength division multiplexing of described 3rd winding module, described 7th photoelectric conversion unit transfers to described 6th branching unit after the global location time service light signal of described first wave length is converted to the global location time service signal of telecommunication, the described global location time service signal of telecommunication is transferred to described 7th electrooptic switching element in a rear road by described 6th branching unit along separate routes, be back to the 5th light wavelength division multiplexing of described 3rd measurement module through described 6th light wavelength division multiplexing after the described global location time service signal of telecommunication is converted to the global location time service light signal of second wave length by described 7th electrooptic switching element.
3. intelligent acess time service device as claimed in claim 2, it is characterized in that, described 3rd measurement module also comprises the 6th photoelectric conversion unit, a 4th GPS time signal pulse per second (PPS) acquiring unit, a 5th GPS time signal pulse per second (PPS) acquiring unit and a 3rd time-delay calculation unit, after described 6th photoelectric conversion unit is converted to the global location time service signal of telecommunication, described 5th GPS time signal pulse per second (PPS) acquiring unit is transferred to after the global location time service light signal of the described second wave length of the described 6th light wavelength division multiplexing transmission that described 5th light wavelength division multiplexing receives, another road global location time service electric signal transmission that described 4th branching unit separates is to described 4th GPS time signal pulse per second (PPS) acquiring unit, described 3rd time-delay calculation unit is real-time respectively to be obtained pulse per second (PPS) from described 4th GPS time signal pulse per second (PPS) acquiring unit and obtains the pulse per second (PPS) from the described global location time service signal of telecommunication of described 3rd winding module passback from described 5th GPS time signal pulse per second (PPS) acquiring unit and transfer at least one far-end receiver module described after calculating optical-fiber time-delay.
4. intelligent acess time service device as claimed in claim 3, it is characterized in that, described 3rd measurement module also comprises second combiner unit and a first shift keying modulation/demodulating unit, described 3rd winding module also comprises the 6th branching unit and a second shift keying modulation/demodulating unit, the road global location time signal that the optical-fiber time-delay of calculating separates with described 4th branching unit after described first shift keying modulation/demodulating unit modulation is transferred to described 6th electrooptic switching element by described 3rd time-delay calculation unit after described second combiner unit closes road, transfer to the 6th light wavelength division multiplexing of the 3rd winding module through described 5th light wavelength division multiplexing after the conjunction road signal of telecommunication is converted to and closes road light signal by described 6th electrooptic switching element, conjunction road optical signal transmission to described 7th photoelectric conversion unit is carried out opto-electronic conversion and transfer to the 6th branching unit after closing the road signal of telecommunication by described 6th light wavelength division multiplexing, described 6th branching unit transfer to after optical-fiber time-delay signal described in filtering from the signal of telecommunication of described conjunction road described second shift keying modulation/demodulating unit carry out demodulation with by the optical-fiber time-delay information transmission of demodulation at least one indoor Base Band Unit described in correspondence to carry out clock alignment.
5. intelligent acess time service device according to claim 4, described 3rd measurement module also comprises the 7th branching unit, described 3rd winding module also comprises the 3rd combiner unit, the global location time service signal of telecommunication that feedback information and described 7th branching unit separate by described second shift keying modulation/demodulating unit transfers to described 7th electrooptic switching element and is converted to conjunction road light signal after described 3rd combiner unit closes road, described 6th light wavelength division multiplexing will close road optical signal transmission to described 5th light wavelength division multiplexing, conjunction road optical signal transmission to described 6th photoelectric conversion unit is carried out opto-electronic conversion for closing the road signal of telecommunication by described 5th light wavelength division multiplexing, described 5th branching unit leaches feedback signal to described first shift keying modulation/demodulating unit from the conjunction road signal of telecommunication and carries out demodulation to obtain feedback information.
6. intelligent acess time service device as claimed in claim 5, it is characterized in that, described 3rd winding module also comprises a switch element, and described 7th branching unit comprises a splitter and filter, and described splitter and described switch element and described filter are electrically connected successively.
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