CN205304806U - Up link system of repeater, applied this repeater - Google Patents
Up link system of repeater, applied this repeater Download PDFInfo
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- CN205304806U CN205304806U CN201520911379.1U CN201520911379U CN205304806U CN 205304806 U CN205304806 U CN 205304806U CN 201520911379 U CN201520911379 U CN 201520911379U CN 205304806 U CN205304806 U CN 205304806U
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Abstract
The utility model provides an up link system carries out the relaying to the light signal, can solve the problem of optical attenuation among the up link, including cable modem, RFoG optical node, going upward optical receiver, cable modem end system, the repeater still provides the repeater of being applied to the up link system simultaneously: optical emitter, RF blender and optical receiver module, optical receiver module include spectrometer, optical receiver, RF attenuator.
Description
Technical field
This utility model relates to radio and television two-way communication field, especially relates to be applied to the repeater of DOCSIS3.0 system above, apply the up-line system of this repeater.
Background technology
DOCSIS(DataOverCableServiceInterfaceSpecifications, data over cable service interface specification), it is an international standard formulated by wire cable normal structure CableLabs, its excellent QoS(QualityofService, service quality) spoken approvingly of in the industry. The nucleus equipment of DOCSIS is CMTS(CableModemTerminalSystems cable modem termination system) and CM(CableModem cable modem), CMTS is the local side apparatus of DOCSIS system, and CM is the terminal unit of DOCSIS system. In general CMTS is installed in machine room, and CM is installed in user side (being typically mounted in user family). Between CMTS to CM, bidirectional communication link is divided into downlink and up-link, and downlink refers to the link from CMTS to CM, otherwise is up-link.
Along with light entering and copper back constantly advances, optical node constantly refines, and optical node constantly advances to user side, quantity is continuously increased, and causes that trunk optical fiber demand is continuously increased, and the up light of machine room is received and is also continuously increased. Receiving and the Cost Problems of backbone optical cable to solve up light, RFOG(RFoverGlass in recent years, optical fiber radio frequency transmits) technology is widely applied, and makes " up optical-fiber network " can adopt the tree structure similar with " descending optical-fiber network ". RFOG is SCTE(SocietyofCableTelevisionEngineers American Cable TV IEEE) technical specification formulating, the up light emission module in RFOG optical node can open and close laser instrument according to the uplink transmission power of CM. In the DOCSIS2.0 epoch, its upper and lower provisional capital is single channel, down channel is called DS, up channel is called US, it is TDM(time division multiplex that upward signal controls technology main flow), that is in the same time, " in the broadcast domain of same CMTS " only one of which CM at most launches signal, means that the up optical sender of only one of which optical node at most in the same time is in work. Thus being easy to use optical mixer to become a road to deliver to machine room the fiber mix from multiple optical nodes, the up light inside machine room is received quantity and is also greatly reduced, and cost substantially reduces. Fig. 1 is the typical case's application in DOCSIS2.0 up-link of the RFOG optical node.The pattern that this direct use normal light blender carries out mixing is called " directly mixed pattern ".
Owing to directly mixing under pattern, optical link decay and splitting ratio have direct relation. refinement recently as optical node, splitting ratio is increasing, the light decay making whole link is increasing, the luminous power arriving machine room begins to the lower limit of photoreceiver receiving ability, even have influence on the up signal to noise ratio of link, as Chinese utility model patent that notification number is 201270573Y provides a kind of uplink multi-path light mixing relay station, by optical signal is received, by beam splitter, the method that then mixing retransmits, improve the luminous power of up-link, play relaying action, but such uplink multi-path light mixing relay station can not be used for based in the up-link of DOCSIS3.0, owing to DOCSIS3.0 employs channel bundled technology, allow " in the broadcast domain of same CMTS " multiple up radio-frequency channels concurrent, although each passage still uses TDM technology, but work alone mutually between these radio-frequency channels. this means have multiple CM to launch signal in " in the same time " simultaneously, and because there is light mixing in uplink multi-path light mixing relay station, so there is the interference of OBI(OpticalBeatInterference optical beat) possibility that occurs, OBI is owing to two wavelength restrainting laser get too close to, the interference produced after convergence, link SNR(SignalNoiseRatio signal to noise ratio will be caused) serious deterioration, it it is a kind of common light interference phenomenon, although those CM launched frequencies on radio frequency are separated simultaneously, it radio-frequency channel is frequency division multiplexing, but by RFOG optical node modulate after optical maser wavelength truly have be probably identical, they arrive the same up smooth time receiving of machine room after the beam splitter of repeater mixes, error code just creates at once, here it is OBI phenomenon.
Utility model content
For the problems referred to above, this utility model provides a kind of up-line system, it is possible to optical signal is relayed, solve the problem of optical attenuation in up-link, optical beat interference in up-line system can be eliminated, additionally provide the repeater being applied to up-link simultaneously
A kind of up-line system, including what be connected:
Cable modem, for uploading through data feedback channel after the ethernet signal from user side is converted to radiofrequency signal;
RFoG optical node, for uploading after the radiofrequency signal from described cable modem is converted into optical signal;
Up optical receiver, in the future from the beginning the optical signal of described RFoG optical node upload after being converted into radiofrequency signal;
Cable modem termination system, is converted into ethernet signal for the radiofrequency signal of described up optical receiver from the beginning in future and is sent to Metropolitan Area Network (MAN);
It is characterized in that:
It is provided with repeater between described up optical receiver and described RFoG optical node, described repeater includes: optical transmitting set, RF blender and Optical Receivers, the outfan of described Optical Receivers connects the receiving terminal of described RF blender, the outfan of described RF blender connects the receiving terminal of described optical transmitting set, Optical Receivers includes beam splitter, optical receiver, RF attenuator, the outfan of described beam splitter connects the receiving terminal of described optical receiver, the outfan of described optical receiver connects the receiving terminal of described RF attenuator, the outfan of described RF attenuator connects the receiving terminal of described RF blender, the outfan of described optical transmitting set connects described up optical receiver, the receiving terminal of described beam splitter connects described RFoG optical node, each described RFoG optical node is connected to a described cable modem, up-line system also includes control unit, described control unit connects described cable modem and described RF attenuator respectively, the radiofrequency signal of described cable modem can be controlled in different data feedback channels by described control unit, described control unit can change the attenuation of described Optical Receivers by described RF attenuator, described control unit can carry out detection signal-to-noise ratio by described RF attenuator.
Further, described RFOG optical node adopts Distributed Feedback Laser.
A kind of repeater being applied to up-line system, including: optical transmitting set, RF blender and Optical Receivers, the outfan of described Optical Receivers connects the receiving terminal of described RF blender, the outfan of described RF blender connects the receiving terminal of described optical transmitting set, it is characterized in that: Optical Receivers includes beam splitter, optical receiver, RF attenuator, the outfan of described beam splitter connects the receiving terminal of described optical receiver, the outfan of described optical receiver connects the receiving terminal of described RF attenuator, the outfan of described RF attenuator connects the receiving terminal of described RF blender, described RF attenuator has electricly connected control unit, described control unit could alter that the attenuation of described Optical Receivers.
The utility model has the advantages that: the up-line system of DOCSIS3.0 system above of the present utility model, achieve and in the up-link of DOCSIS3.0 system above, optical signal is relayed, solve the problem that in up-link, luminous power is not enough, repeater adopts beam splitter to carry out mixing to receive simultaneously, a large amount of optical receiver need not be used, cost and Overall Power Consumption are saved, be conducive to promoting, the method of optical beat interference in the up-link of DOCSIS3.0 system above can also be eliminated, avoid optical beat interference, improve and upload link signal to noise ratio.
Accompanying drawing explanation
Fig. 1 is existing RFoG optical node application schematic diagram in the up-link of DOCSIS2.0 system;
Fig. 2 is the wavelength of transmitted light test tables of data of the RFoG optical node in this utility model embodiment;
Fig. 3 is the tables of data after the RFoG optical node in this utility model embodiment is redistributed;
Fig. 4 repeater of the present utility model has the structural representation of 4 Optical Receivers;
Fig. 5 is the application schematic diagram on the up-link road of the DOCSIS3.0 system that optical signal is relayed of utility model.
Detailed description of the invention
In present embodiment, repeater of the present utility model, up-line system is specifically described in the situation based on DOCSIS3.0 technology, the CMTS Typical Disposition of support DOCSIS3.0 is 16 descending RF passages, there is the downlink bandwidth of 800MBPS, 4 up RF passage US1, US2, US3, US4, have the upstream bandwidth of 160MBPS.
Seeing Fig. 5, the up-link of the DOCSIS3.0 system of the present embodiment contains modulation /demodulation terminal system 1, up optical receiver 2, RFoG optical node 3, cable modem 4, repeater 5, control unit 6.
In the present embodiment, RFOG optical node adopts Distributed Feedback Laser, two Distributed Feedback Laser (DistributedFeedbackLaser, i.e. distributed feedback laser) wavelength difference less than 0.2nm time the OBI obvious effect to signal to noise ratio, the present embodiment contains 32 RFoG optical nodes, Fig. 2 is the wavelength of transmitted light data of 32 RFoG optical nodes, and wavelength of transmitted light data have pressed wavelength sequence; The form of Fig. 2 also analyzes the RFoG optical node ID combination that can produce OBI.
See Fig. 4, repeater in embodiment of the present utility model, including: optical transmitting set 7, RF blender 8 and Optical Receivers 9, the outfan 10 of Optical Receivers connects the receiving terminal 11 of RF blender, the outfan 12 of RF blender connects the receiving terminal 13 of optical transmitting set, Optical Receivers 9 includes beam splitter 14, optical receiver 15, RF attenuator 16, the outfan 17 of beam splitter connects the receiving terminal 18 of optical receiver, the outfan 19 of optical receiver connects the receiving terminal 20 of RF attenuator, the outfan 23 of RF attenuator connects the receiving terminal 11 of RF blender, RF attenuator 16 is connected to control unit 6, control unit 6 could alter that the attenuation of Optical Receivers 9, repeater in Fig. 4 has 4 Optical Receivers 9, Optical Receivers 9 adopts the structure of 8 mixed 1, meet the input of 332 RFoG, correspondence can also change the Optical Receivers 9 of 4 mixed 1 or 16 mixed 1 into, as long as each Optical Receivers 9 correspondence arranges an optical receiver, a large amount of optical receiver need not be used, cost and Overall Power Consumption are saved, be conducive to promoting.
See Fig. 4, Fig. 5, the up-link of DOCSIS3.0 system is from cable modem 4 to the signal transmission link of cable modem termination system 1, ethernet signal from user side is converted to radiofrequency signal by cable modem 4, between RFoG optical node 3 and cable modem 4, upstream radio-frequency signal and downlink radio-frequency signal employ frequency multiplexing technique, uplink and downlink signals transmits in same cable and does not interfere with each other, upstream radio-frequency signal is uploaded through data feedback channel, upstream radio-frequency signal is changed into optical signal and sends by RFoG optical node 3, optical signal from RFoG optical node 3 is gone back to radiofrequency signal by up optical receiver 2 again, upstream radio-frequency signal is converted into ethernet signal and is sent to Metropolitan Area Network (MAN) by last cable modem termination system 4. the signal conversion of up-link is 5 State Transferring: Ethernet-radio frequency-light-radio frequency-Ethernet.
In the up-link of the DOCSIS3.0 system of the present embodiment, between up optical receiver 2 and RFoG optical node 3, repeater 5 is set, repeater 5 includes: optical transmitting set 7, RF blender 8 and Optical Receivers 9, the outfan 10 of Optical Receivers connects the receiving terminal 11 of RF blender, the outfan 12 of RF blender connects the receiving terminal 13 of optical transmitting set, Optical Receivers 9 includes beam splitter 14, optical receiver 15, RF attenuator 16, the outfan 17 of beam splitter connects the receiving terminal 18 of optical receiver, the outfan 19 of optical receiver connects the receiving terminal 20 of RF attenuator, the outfan 23 of RF attenuator connects the receiving terminal 11 of RF blender, the outfan 21 of optical transmitting set connects up optical receiver 2, the receiving terminal 22 of beam splitter connects RFoG optical node 3, each RFoG optical node 3 is connected to a cable modem 4, control unit 6 connects cable modem 4 and RF attenuator 16 respectively, the radiofrequency signal of cable modem 4 can be controlled in different data feedback channels by control unit 6, control unit 6 can control RF attenuator 16 and change the attenuation of Optical Receivers, control unit 6 can carry out detection signal-to-noise ratio by RF attenuator 16, by the setting of repeater, achieve and in the up-link of DOCSIS3.0 system, optical signal is relayed, solve the problem that in up-link, luminous power is not enough.
Seeing Fig. 4, when up-link just powers on, the radiofrequency signal of all cable modems 4 is likely distributed in different data feedback channels, starts from by reaching the standard grade. Now due to the impact of OBI phenomenon, the up signal to noise ratio having some cable modems 4 is very poor, and now control unit starts to get involved work.
Cable modem termination system is CableModemTerminalSystems, represents hereafter abbreviated with CMTS; Cable modem is CableModem, represents hereafter abbreviated with CM; Optical beat interference is OpticalBeatInterference, represents hereafter abbreviated with OBI.
In order to solve OBI problem, the method needing to adopt the optical beat interference of the up-link eliminating DOCSIS3.0 system above of the present utility model, obtain the topological structure of Optical Receivers and cable modem, controlling the data feedback channel of cable modem in units of RFoG optical node, the optical node combination that will produce optical beat interference is determined in signal to noise ratio change when control unit detection RFoG optical node uploads optical signal; The optical node combination that can produce optical beat interference in each Optical Receivers is assigned in same data feedback channel by control unit.
The method of optical beat interference in the up-link of the DOCSIS3.0 system that optical signal is relayed by elimination of the present utility model, detection produces the RFoG optical node combination of optical beat interference and distributes the optical node combination producing optical beat interference, concrete including preparation process:
Preparation process: eliminate OBI: control unit controls all CM and is all limited in data feedback channel US1, but uploading bandwidth can only use 1/4th, but OBI no longer exists, all CM can without packet loss communication, all of CM is operated in US1, then causing the waste of other 3 data feedback channels, inefficiency, preparation process 1 is to facilitate subsequent control.
Obtain the topological structure between CM and Optical Receivers: control unit is by controlling the RF attenuator of Optical Receivers one by one, increase or reduce the attenuation of Optical Receivers, increase or reduction that up-link decays will be caused, the up-link of DOCSIS is very sensitive to decay, and the launching electrical level of CM could be made that quick response. Control unit is easy to from the management information of CMTS, obtains these CM by gathering the variable quantity of the launching electrical level of CM. Through this step, control unit obtains the corresponding relation of all CM and Optical Receivers, RFoG optical node is not affected by control, RFoG optical node finds that CM has radio frequency up, turn on laser instrument to launch, therefore it is control CM to data feedback channel that control unit 10 controls RFoG optical node actual in data feedback channel, starts to control in units of optical node the data feedback channel of CM after completing preparation process 1, preparation process 2, each optical node can select US passage (optional US1, US2, US3, US4).
A kind of method eliminating the interference of optical beat in up-link, it is characterized in that: obtain the topological structure of Optical Receivers and cable modem, controlling the data feedback channel of cable modem in units of RFoG optical node, the optical node combination that will produce optical beat interference is determined in signal to noise ratio change when control unit detection RFoG optical node uploads optical signal; The optical node combination that can produce optical beat interference in each Optical Receivers is assigned in same data feedback channel by control unit.
Further, the step of the optical node combination that RFoG optical node combines and distribution produces optical beat interference that detection produces optical beat interference is as follows:
Step (1): RFoG optical node is connected to one by one the input port of the beam splitter of each Optical Receivers, control unit controls the attenuator of Optical Receivers one by one, change the attenuation of Optical Receivers, obtain the topological structure of Optical Receivers and cable modem, in units of RFoG optical node, control the data feedback channel of cable modem;
Step (2): select an Optical Receivers as current Optical Receivers, select a data feedback channel as the first data feedback channel, the RFoG optical node being connected to current Optical Receivers is controlled in the first data feedback channel by control unit, and all the other data feedback channels are idle data feedback channel;
Step (3): select an idle data feedback channel as current data feedback channel, select a RFoG optical node in current Optical Receivers as current optical node one by one, current optical node is controlled in current data feedback channel by control unit, control unit controls RF attenuator and detects current optical node with whether remaining RFoG optical node in current Optical Receivers exists signal to noise ratio deterioration, if detecting, signal to noise ratio deteriorates, then the RFoG optical node that signal to noise ratio deterioration occurs is controlled in current data feedback channel by control unit, have detected that the RFoG light joint that signal to noise ratio deterioration occurs is not re-used as current optical node, other an idle data feedback channel of reselection is as current data feedback channel, and select RFoG optical node that in current Optical Receivers, one does not occur signal to noise ratio to deteriorate as current optical node, current optical node is controlled in current data feedback channel to continue to detect whether remaining RFoG optical node and current optical node in current Optical Receivers exist signal to noise ratio deterioration by control unit, if being not detected by signal to noise ratio deterioration, directly select another idle data feedback channel as current data feedback channel, and select RFoG optical node that in current Optical Receivers, one does not occur signal to noise ratio to deteriorate as current optical node, current optical node is controlled in current data feedback channel to continue to detect remaining RFoG optical node with whether current optical node exists signal to noise ratio deterioration by control unit, until all RFoG optical nodes in current Optical Receivers are all assigned in different data feedback channels,
Step (4): repeat step (2), (3) until the RFoG optical node of all Optical Receivers is all assigned in different data feedback channels.
It is that example illustrates that the RFoG optical node combination detecting generation optical beat interference and other steps distributing the generation optical node that optical beat disturbs combination use Optical Receivers A.
Optical Receivers A accesses RFoG optical node and is numbered 1 ~ 8, and owing to each RFoG optical node is connected to a CM, so CM numbering is also 1 ~ 8, all CM data feedback channels are US1, and these CM are formed an inventory, it is simple to describe the CM operation removed from inventory.
Choose first RFoG optical node in inventory, the data feedback channel of CM corresponding for first RFoG optical node is become an idle passage US2 the up signal to noise ratio situation of change of other CM in control unit detection inventory. If it find that the deterioration of some CM signal to noise ratio just indicates the generation of OBI in inventory, these occur that the CM of signal to noise ratio deterioration all move into idle channel US2; If not finding that signal to noise ratio deterioration means that same bunch of the current CM any CM of discord, remove from inventory after current CM is assigned to idle channel.
After 1st detection signal-to-noise ratio deterioration, totally 3 nodes of the optical node 1,7,8 in Fig. 2 will be assigned to US2, and other 5 nodes are still in US1.
After the deterioration of 2nd detection signal-to-noise ratio, the optical node 2 in Fig. 2 will be assigned to US3, and other 4 nodes are still in US1, and optical node 2 is got along well other optical nodes generation OBI in inventory.
After 3rd detection signal-to-noise ratio deterioration, totally 3 nodes of the optical node 3,4,6 in Fig. 2 will be assigned to US4, and only node 5 is stayed in US1.
Deteriorating through 3 detection signal-to-noise ratios, all RFoG optical nodes in Optical Receivers A have all been assigned with.
When all RFoG optical nodes in an Optical Receivers are carried out optical beat Interference Detection and distribution produce optical beat interference optical node combination time, if data feedback channel is all assigned RFoG optical node, first data feedback channel also have at least two signal to noise ratio deterioration RFoG optical node does not occur, select the data feedback channel having minimum RFoG optical node as in current data feedback channel, control unit will not occur signal to noise ratio deterioration RFoG optical node to upload in current data feedback channel as current optical node one by one one by one, control unit controls RF attenuator and detects the remaining RFoG optical node not occurring signal to noise ratio to deteriorate with whether current optical node exists signal to noise ratio deterioration, detect that signal to noise ratio deteriorates, then the RFoG optical node that signal to noise ratio deterioration occurs is controlled in current data feedback channel, reselect the data feedback channel having minimum RFoG optical node as current data feedback channel, have detected that the RFoG light joint that signal to noise ratio deterioration occurs is not re-used as current optical node, and select the next RFoG optical node not occurring signal to noise ratio to deteriorate as current optical node, current optical node is controlled in current data feedback channel to continue to detect remaining RFoG optical node with whether current optical node exists signal to noise ratio deterioration by control unit, otherwise then reselect the data feedback channel having minimum RFoG optical node as current data feedback channel, and select the next RFoG optical node not occurring signal to noise ratio to deteriorate as current optical node, current optical node is controlled in current data feedback channel to continue to detect remaining RFoG optical node with whether current optical node exists signal to noise ratio deterioration by control unit, until all RFoG optical nodes in an Optical Receivers are all assigned in different data feedback channels.
In Optical Receivers B, after the deterioration of the 1st detection signal-to-noise ratio, totally 1 optical node of the optical node 9 in Fig. 2 will be assigned to US2, and other 7 nodes are still in US1, and optical node 9 is got along well other optical nodes generation OBI in inventory.
After 2nd detection signal-to-noise ratio deterioration, totally 2 optical nodes of the optical node 10,14 in Fig. 2 will be assigned to US3, and other 5 nodes are still in US1.
After 3rd detection signal-to-noise ratio deterioration, the optical node 12,13,15 in Fig. 2 will be assigned to US4, and other 2 nodes are still in US1.
Now passage all takies, selecting US2 as current data feedback channel, be placed in a passage by optical node 16 and optical node 9, optical node 16 other optical nodes in inventory of getting along well produce OBI, remaining optical node 11 other optical nodes in inventory of also getting along well produce OBI, are retained in US1.
By the method same with RFoG optical node in process Optical Receivers A, RFoG optical node in Optical Receivers B, C, D is assigned in different data feedback channels, in order to realize the equilibrium of data feedback channel, after RFoG optical node in all of Optical Receivers is all assigned to different data feedback channels, all RFoG optical nodes in any two difference data feedback channel in any one Optical Receivers are interchangeable so that the RFoG optical node quantity in this any two difference data feedback channel tends to balanced.
In current this area, this utility model is also applied for DOCSIS3.1 standard, and DOCSIS3.1 standard can make application prospect of the present utility model wider, because DOCSIS3.1 supports higher upstream bandwidth. Causing the crowded problem of the RFoG optical node of single data feedback channel in single data feedback channel RFoG optical node, the single data feedback channel of DOCSIS3.1 has bigger bandwidth, and this will make congested problem seem less serious.
Claims (3)
1. a up-line system, including what be connected:
Cable modem, for uploading through data feedback channel after the ethernet signal from user side is converted to radiofrequency signal;
RFoG optical node, for uploading after the radiofrequency signal from described cable modem is converted into optical signal;
Up optical receiver, in the future from the beginning the optical signal of described RFoG optical node upload after being converted into radiofrequency signal;
Cable modem termination system, is converted into ethernet signal for the radiofrequency signal of described up optical receiver from the beginning in future and is sent to Metropolitan Area Network (MAN);
It is characterized in that:
It is provided with repeater between described up optical receiver and described RFoG optical node, described repeater includes: optical transmitting set, RF blender and Optical Receivers, the outfan of described Optical Receivers connects the receiving terminal of described RF blender, the outfan of described RF blender connects the receiving terminal of described optical transmitting set, Optical Receivers includes beam splitter, optical receiver, RF attenuator, the outfan of described beam splitter connects the receiving terminal of described optical receiver, the outfan of described optical receiver connects the receiving terminal of described RF attenuator, the outfan of described RF attenuator connects the receiving terminal of described RF blender, the outfan of described optical transmitting set connects described up optical receiver, the receiving terminal of described beam splitter connects described RFoG optical node, each described RFoG optical node is connected to a described cable modem, up-link also includes control unit, described control unit connects described cable modem and described RF attenuator respectively, the radiofrequency signal of described cable modem can be controlled in different data feedback channels by described control unit, described control unit can change the attenuation of described Optical Receivers by described RF attenuator, described control unit can carry out detection signal-to-noise ratio by described RF attenuator.
2. a kind of up-line system according to claim 1, it is characterised in that: described RFOG optical node adopts Distributed Feedback Laser.
3. the repeater of the up-line system being applied to described in claim 1, including: optical transmitting set, RF blender and Optical Receivers, the outfan of described Optical Receivers connects the receiving terminal of described RF blender, the outfan of described RF blender connects the receiving terminal of described optical transmitting set, it is characterized in that: Optical Receivers includes beam splitter, optical receiver, RF attenuator, the outfan of described beam splitter connects the receiving terminal of described optical receiver, the outfan of described optical receiver connects the receiving terminal of described RF attenuator, the outfan of described RF attenuator connects the receiving terminal of described RF blender, described RF attenuator has electricly connected control unit, described control unit could alter that the attenuation of described Optical Receivers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520911379.1U CN205304806U (en) | 2015-11-16 | 2015-11-16 | Up link system of repeater, applied this repeater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520911379.1U CN205304806U (en) | 2015-11-16 | 2015-11-16 | Up link system of repeater, applied this repeater |
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| CN205304806U true CN205304806U (en) | 2016-06-08 |
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| CN201520911379.1U Withdrawn - After Issue CN205304806U (en) | 2015-11-16 | 2015-11-16 | Up link system of repeater, applied this repeater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105306144A (en) * | 2015-11-16 | 2016-02-03 | 无锡路通视信网络股份有限公司 | Repeater, uplink applying same and method for removing optical beat interference in uplink |
-
2015
- 2015-11-16 CN CN201520911379.1U patent/CN205304806U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105306144A (en) * | 2015-11-16 | 2016-02-03 | 无锡路通视信网络股份有限公司 | Repeater, uplink applying same and method for removing optical beat interference in uplink |
| CN105306144B (en) * | 2015-11-16 | 2018-01-30 | 无锡路通视信网络股份有限公司 | Repeater, using the repeater up-link and eliminate its optical beat interference method |
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| C14 | Grant of patent or utility model | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20160608 Effective date of abandoning: 20180130 |
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| AV01 | Patent right actively abandoned |