CN201590911U - Wireless communication far-end apparatus - Google Patents
- ️Wed Sep 22 2010
CN201590911U - Wireless communication far-end apparatus - Google Patents
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- CN201590911U CN201590911U CN2009203508388U CN200920350838U CN201590911U CN 201590911 U CN201590911 U CN 201590911U CN 2009203508388 U CN2009203508388 U CN 2009203508388U CN 200920350838 U CN200920350838 U CN 200920350838U CN 201590911 U CN201590911 U CN 201590911U Authority
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Abstract
The utility model embodiment discloses a wireless communication multi-system type far-end apparatus, which comprises a photoelectric converter, a power division device, a plurality of radio frequency boards, a plurality of data boards and a combiner and can be used for receiving and modulating multi-system type wireless signals. The wireless communication far-end apparatus provided by the utility model embodiment can receive and modulate multi-system type wireless signals, thereby implementing the fusing of multi-system type wireless communication networks and effectively reducing the costs of network construction and maintenance.
Description
Technical field
The utility model relates to wireless communication technology field, more particularly, relates to a kind of radio communication far end device.
Background technology
Continuous development along with wireless communication technology, corresponding multiple communication standard and the communication network of having occurred, global system for mobile communications (GSM for example, Global System for Mobile Communications), code division multiple access (CDMA, Code Division Multiple Access) etc., but in the current wireless communication network, each radio communication standard need be carried out the transmission of data by a cover network, therefore, all need independent voluntarily networking and maintenance, cause the unnecessary repeated construction waste of common carrier like this, easily.For example, with China Mobile, it is runing GSM, Time Division-Synchronous Code Division Multiple Access (TD-SCDMA now simultaneously, Time Division-Synchronous Code Division Multiple Access), WLAN (wireless local area network) (WLAN, Wireless Local Area Networks) a plurality of networks such as, if want to solve the covering problem of these networks in same area, just need build a cover compartment system respectively, cause the significant wastage of networking and maintenance cost.For this reason, the wireless optical fibre distribution system occurred, this system can carry out compatibility to the radio communication of multiple standard, but does not occur being applied in well the far end device in this system at present as yet.
The utility model content
In view of this, the utility model embodiment provides a kind of radio communication far end device, with the compatibility of effective realization multi-standard wireless network.
The utility model embodiment is achieved in that
The utility model embodiment provides a kind of radio communication multi-modulation scheme far end device, and this device comprises: optical-electrical converter, power splitter, some rf boards, plurality of data plate and mixer, wherein,
Described optical-electrical converter is used for the compound electric signal that described power splitter sends will be converted to composite optical signal, and is sent to described power splitter after being used for received composite optical signal is converted to compound electric signal;
Described power splitter be used for the road compound electric signal that described optical-electrical converter sends is converted to the multichannel compound electric signal, and the multichannel compound electric signal after will changing is sent to corresponding rf board and database respectively; And be used for the multichannel compound electric signal of described rf board and the transmission of described database is converted to one tunnel compound electric signal, and be sent to described optical-electrical converter;
Described rf board, the compound electric signal that is used for described power splitter is sent is amplified, and is sent to described mixer; And be used for the compound electric signal that described mixer sends is amplified, and send to described power splitter;
Described database, the compound electric signal that is used for that described power splitter is sent is modulated, is amplified, and is sent to described mixer; And be used for the compound electric signal that described mixer sends is carried out demodulation, amplification, and be sent to described power splitter;
Described mixer, the signal that is used for described rf board and described database sent merges into one the tunnel, and sends by respective antenna; And be used to receive the signal that described respective antenna sends, and described signal is carried out shunt according to standard, the signal after shunt is sent to corresponding rf board and database.
Preferably, also comprise monitoring module, described monitoring module is used for one or more information of described optical-electrical converter, described rf board, described database is gathered, and utilizes the information that collects that it is monitored.
Described monitoring module also is used for the one or more information according to the described optical-electrical converter that is collected, described rf board, described database, and it is controlled.
Described rf board comprises: band pass filter, power amplifier, dielectric duplexer and low noise amplifier, wherein,
Described band pass filter is used for filtering and inserts other outer signals of signal useful signal, and will be sent to described power amplifier through the signal of filtering;
Described power amplifier is used for the signal that described band pass filter sends is amplified, and is sent to described duplexer;
Described duplexer is used for realizing by different dielectric resonant chambers the separation of up-downgoing frequency;
Described low noise amplifier is used to realize that the low noise of upward signal amplifies.
Described band pass filter is a Surface Acoustic Wave Filter.
Described database comprises: the demodulation submodule, separate frame submodule, framing submodule, modulation submodule and AP submodule, wherein,
Described demodulation submodule is used for received signal is demodulated to frame signal, and described frame signal is sent to the described frame submodule of separating;
The described frame submodule of separating is used for the frame signal that described demodulation submodule sends is reduced to data-signal, and described data-signal is sent to described AP submodule;
Described AP submodule is used for received digital signal is modulated;
Described framing submodule is used for the data-signal that described AP submodule sends is converted to frame signal, and this frame signal is sent to described modulation submodule;
Described modulation submodule is used for the frame signal that described framing submodule sends is modulated to selected carrier frequency.
Described monitoring module comprises: core processing submodule, information gathering submodule, protocol conversion submodule, wherein,
Described information gathering submodule is used to carry out the collecting work of monitor message;
Described core processing submodule is used for the monitor message that described information gathering submodule is collected is converted to digital signal, and described digital signal is sent to described protocol conversion submodule;
Described protocol conversion submodule, but be used for the digital signal that described core processing submodule is sent is converted to recognition instruction.
Prior art is compared, the technical scheme that the utility model embodiment provides has the following advantages and characteristics: the radio communication far end device that the utility model embodiment is provided, the wireless signal of multiple standard can be received and modulates, realize the fusion of multiple standard cordless communication network, can effectively reduce the cost of networking and maintenance.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the related a kind of radio communication far end device structural representation of the utility model embodiment;
Fig. 2 is the related another kind of radio communication far end device structural representation of the utility model embodiment;
Fig. 3 is the structural representation of the related a kind of rf board of the utility model embodiment;
Fig. 4 is the structural representation of the related a kind of database of the utility model embodiment;
Fig. 5 is the structural representation of the related a kind of monitoring module of the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
The utility model provides a kind of radio communication remote-control device, and this device comprises structure as shown in Figure 1: optical-
electrical converter101,
power splitter102,
rf board103,
database104 and
mixer105, wherein:
Optical-
electrical converter101 is used to carry out the conversion between composite optical signal and the compound electric signal, and because the radio communication remote-control device in the present embodiment is a two-way device, therefore, at two kinds of situations of uplink and downlink, optical-electrical converter has following function respectively:
On down link, the composite optical signal that optical-
electrical converter101 is used for receiving is converted to compound electric signal, in addition, can produce loss when transmitting on analog circuit owing to compound electric signal, the loss that optical-
electrical converter101 also can be tackled this compound electric signal mutually and be produced compensates.Need to prove, because the radio communication far end device that is provided in the present embodiment is a device that can be used for multiple standard, therefore, the involved herein composite optical signal that receives can be the downstream signal that has comprised multiple mobile communication such as CDMA, GSM, and is many other service signals such as data-signal of radio frequency through ovennodulation, frequency conversion.
And on up link, optical-
electrical converter101 is used for compound electric signal is converted to composite optical signal, in like manner, according to actual conditions, involved herein composite optical signal can be to have comprised multiple other service signals such as the downstream signal of multiple mobile communication such as CDMA, GSM and other radio-frequency (RF) data signal.
102 according to the difference of described link, can have different functions equally, and when this
power splitter102 was in down link,
power splitter102 was used for the road compound electric signal that optical-
electrical converter101 is sent is divided into the multichannel compound electric signal.For achieving the above object, power splitter can adopt following design: with impedance is R 0The input transmission line be divided into N bar impedance phase with branch line, for example, each road output port of power splitter is all linked to each other with common node by an isolation resistance, its output coupling is good, and increased isolation between the output port, because after a signal is input to power splitter, because the symmetry of circuit structure will make input power be divided into equal-sized N part output.
In last phase link,
power splitter102 is used for the multi-channel rf signal that each rf board or database send is merged into one tunnel compound electric signal.
103, the mobile communication business signal that is used for different frequency that
power splitter102 is separated amplifies output.
104, on down link, after being used for 102 isolated compound electric signal of power splitter are demodulated into digital signal it is modulated,, amplify output after for example the digital signal after the demodulation being modulated to the 2400M frequency of WLAN work to be adapted to concrete network.
On up link, the digital signal that is used for receiving is modulated to compound electric signal, and sends to
power splitter102.
105, in down link, the signal of received
RF plate103 and
database104 outputs, this signal is merged the shared port output in back, further be specially, what
mixer105 was realized is the filter function of a plurality of band circulation passage, promptly only allows the signal of this passage corresponding frequency band to pass through in arbitrary passage, and can provide to a certain degree buffer action to the signal beyond this frequency range, close road and purpose along separate routes with what finish a plurality of frequency band signals.And
mixer105 is made up of a plurality of filters on principle, and each filtering channel all has certain inhibitory action to the frequency signal beyond this passage, plays the effect of isolating frequency range.
Simultaneously, in up link, the upward signal of the different systems that
mixer105 will receive by antenna separates by frequency, and delivers to pairing rf board of each signal and database respectively.
Can learn by above-mentioned,
mixer105 plays road and the effect along separate routes of closing respectively in down link and up link, wherein, the effect of closing the road function is that the descending power amplifier output signal with various standards is combined into one tunnel output, reaching the purpose of common antenna, and non-interference between the signal of each frequency range; Along separate routes the effect of function is actually mixer usefulness conversely, and working is that each standard upward signal in the full-service signal that will receive is divided into multichannel, exports the low noise amplifier circuit of each standard, and non-interference.
A kind of radio communication far end device that present embodiment provided can receive the wireless signal of multiple standard and modulate, and realizes the fusion of multiple standard cordless communication network, can effectively reduce the cost of networking and maintenance.
The utility model embodiment also provides another radio communication far end device, this device comprises structure as shown in Figure 2, wherein, the basic device of this device in comprising a last embodiment, also can comprise
monitoring module201, this module can be used for by the interface that links to each other with other each modules the information of other modules being gathered, and in the present embodiment, the module that monitoring module can be monitored can comprise
photoelectric transformer101,
rf board103,
database104 etc.Except above supervisory function bit to other modules, also can communicate the transmission and the protocol conversion of information, for example the control command that receives is converted to each module reality and can carries out information, the monitor message of each module that will collect gathers and is converted to the protocol form that the higher level can receive and passes to the higher level simultaneously, thereby realize the concurrent means of communication of whole system layering, this method has not only been alleviated all modules and has all directly been reported confusion and the big data quantity that is brought, also simplified system configuration, the clear and definite division of labor separately.
Except above basic module, according to concrete application, also above-mentioned module further can be divided, for example,
rf board103 can be specially:
103 can adopt power amplifier, low noise amplifier integrated module to realize that the duplex of up-downgoing adopts dielectric filter, has effectively reduced equipment volume.Use low-power consumption on down link, the micropower amplifier adds radome by every grade of amplifier, and one-level is amplified the form that adds one-level filtering, has promptly realized the amplification of signal, has realized filtering again.By selecting well behaved low noise amplifier, add radome by every grade of power amplifier on up link, one-level is amplified the form that adds the one-level filter, and the low noise of having finished signal amplifies.
Rf board103 is integrated with microcontroller, realizes that the control of remote termination operating state, the collection of information report.By adding power detection, realize the control of remote termination power in the amplifier outlet.Except above-mentioned basic device, by increasing current sensor, temperature sensor realization monitoring power amplifier work state in real time.Below, can be as shown in Figure 3 to the main modular in the
rf board103 that present embodiment provided:
Band pass filter 301 is used for the descending access signal of filtering other signal except that useful signal, realizes the extraction of useful signal.It at first will finish the inhibition to other composite signals.For other common network signals of reaching the output of this standard rf board are enough little, to the purpose that the covering of other common network signals does not exert an influence, this rf board will have 60dB at least to the inhibition degree of other composite signals.Secondly, it also will prevent to be subjected to the obstruction of other signals, causes gain compression, and amplifier produces nonlinear distortion can't operate as normal.Because band pass filter will be finished above-mentioned function, also good squareness factor to be arranged, and in frequency band, keep good passband fluctuation characteristic, for the squareness factor that obtains, adopt Surface Acoustic Wave Filter among the embodiment of the present utility model, Surface Acoustic Wave Filter has good squareness factor.But it can cause bigger passband fluctuation.And it is also bad in the inhibition from passband frequency place far away.Therefore in embodiment of the present utility model, in a plurality of junction filters, also selected dielectric filter.It can provide the good restraining from passband frequency place far away, and the passband fluctuation of being introduced by it is very little.By above method, we have realized that high-band suppresses in the frequency band of broad outward, the Design of Bandpass of fluctuation in the low strap.
Power amplifier 302 is used for the amplification of downstream signal.In the utility model embodiment, power amplifier requires that bigger dynamic input range is arranged, with reach can the automatic control system gain purpose.If system will leave the dynamic gain adjusting range of 20dB, then typical input signal values increases under the situation of 20dB input the required power amplifier than it at signal, still guarantees favorable linearity.And be controlled on the predefined power power output is stable.Automatic gain control is used to realize the adaptive control of far-end unit gain.In whole system, it is relatively stable that it not only plays the control power output, prevents the purpose that power tube burns, and it also has compensation because the effect of the gain loss that fiber optic stretch causes.Its realization principle is: in the detection of power amplifier delivery outlet power, obtain the magnitude of voltage of PA power output wave detector output by the AD sampling, thereby obtain the output power value of power amplifier module, feed back to adjustable attenuator then, carry out gain controlling.Thereby reach automatic gain control function.Because introduce such design in link, on the one hand, when signal increased, automatic gain control circuit can strengthen the attenuation of adjustable attenuator, reached stable power output, the effect of protection power amplifier operate as normal; On the other hand, when signal reduced owing to fiber optic stretch, automatic gain control circuit can reduce the attenuation of adjustable attenuator, reached the bucking-out system gain, made equipment full power export operate as normal.
Dielectric duplexer 303 is used to realize the separation of up-downgoing frequency, and its operation principle is the same with dielectric filter, is to realize that by different dielectric resonant chambers the frequency selection separates.By selecting such dielectric filter for use, realized the miniaturization of complete machine among the embodiment of the present utility model, the integrated design of uplink downlink.
Low noise amplifier 304 is used to realize that the low noise of upward signal amplifies.
More than device extracts amplification with the signal of a kind of communication service in the compound electric signal, and the operation principle of other rf boards all is identical, has so just realized that multiple services signal accomplished to distinguish processing and amplifying by different rf boards.
In addition,
database104 can comprise structure as shown in Figure 4:
Demodulation submodule 401 is used for the signal with the demodulated data signal framing of modulation.
Separate frame submodule 402, be used for the original form that framing signals is reduced into data-signal being exported to miscellaneous equipment, and extract point-to-multipoint control protocol the corresponding command that MU (wireless optical fibre distribution system master unit) sends by the point-to-multipoint control protocol.The core content of point-to-multipoint control protocol is how to pass through time division multiplexing mode, guarantees normally uplink transmission data of each database, does not clash, or after clashing, by the influence that certain means manage conflict, guarantees normal transfer of data.Be example with the ALOHA agreement below, point-to-multipoint control protocol mode of operation is described: descending employing broadcast mode, each terminal determines whether to be this end message, selective reception by the address information in the downlink broadcast frame.Up employing is as long as the user has data to send, although just allow them send.Certainly, thus can produce like this conflict cause frame destruction.By the feedback of downlink broadcast channel, transmit leg can carry out collision detection in sending the process of data, and the data that receive and the data of buffering area are compared, and just can know whether Frame is destroyed.Same reason, other users also are according to this process work.If transmit leg is known Frame and suffers to destroy (promptly detecting conflict) that it can wait for one section with retransmitting this frame after captain's time so.Above-mentioned agreement realizes simple, but as easy as rolling off a log generation conflict, channel utilization is low.Improve channel utilization and can adopt time slot A LOHA agreement, its core is to unify user's data with clock to send.Way is that the time is divided into discrete timeslice, and the user must wait until that at every turn next timeslice could begin to send data, thereby has avoided the user to send the randomness of data, has reduced data and has produced the possibility of conflict, has improved the utilance of channel.
403, being used for by the point-to-multipoint control protocol original data signal being carried out framing handles, the point-to-multipoint control command framing that original data signal and database self will be sent, add control command and be in order to ensure that each database normally sends data, and do not produce data collision.
Modulation submodule 404 is used for the data signal modulation after the framing adopting 1000MHz among the present invention to selected carrier frequency.
AP submodule 405 is used for digital signal is modulated, and for example is modulated to 2400MHz and adopts 802.11 agreements to realize the WLAN business, and this module has the technical grade chip product.
By above data module the data signal extraction in the composite signal is come out to carry out modulation and handle, utilize the AP submodule finally to realize the WLAN business.
At last, the utility model embodiment also provides the concrete structure of monitoring module, and this monitoring module can comprise structure as shown in Figure 5:
501, can adopt the ARM single-chip microcomputer, as: TQFP-144-LPC2214, as adopt TQFP-144-LPC2214, this integrated circuit TQFP-144-LPC2214 connects EEPROM by it self P1 mouth, the little X5045 of EEPROM integrated circuit, record significant data, can power down preserve, and can revise at any time; The P0 mouth is the data/address bus that data/address bus connects the 12bit A/D conversion circuit, and P2 is the address strobe line of A/D conversion circuit; The interface level conversion chip is connected by MAX233, the data message that device interior is indicated with Transistor-Transistor Logic level can be carried out level conversion, is changed by A/D conversion circuit again, passes to microprocessor by data/address bus.
Local information is gathered submodule 502, realizes the collection of local monitor information, can adopt the chip of the suitability for industrialized production that has been.
Protocol conversion submodule 502 is realized the protocol conversion to higher level's communication information.Passing on the instruction transformation of getting off with the higher level is that the message form that subordinate can receive passes to each module, simultaneously the information of each module is gathered to be converted to the protocol form that the higher level can receive and to pass to the higher level.This is to be finished by the software program in the central processing unit.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined herein General Principle can realize under the situation that does not break away from spirit or scope of the present utility model in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (7)
1. a radio communication far end device is characterized in that, comprising: optical-electrical converter, power splitter, some rf boards, plurality of data plate and mixer, wherein,
Described optical-electrical converter is used for the compound electric signal that described power splitter sends will be converted to composite optical signal, and is sent to described power splitter after being used for received composite optical signal is converted to compound electric signal;
Described power splitter be used for the road compound electric signal that described optical-electrical converter sends is converted to the multichannel compound electric signal, and the multichannel compound electric signal after will changing is sent to corresponding rf board and database respectively; And be used for the multichannel compound electric signal of described rf board and the transmission of described database is converted to one tunnel compound electric signal, and be sent to described optical-electrical converter;
Described rf board, the compound electric signal that is used for described power splitter is sent is amplified, and is sent to described mixer; And be used for the compound electric signal that described mixer sends is amplified, and send to described power splitter;
Described database, the compound electric signal that is used for that described power splitter is sent is modulated, is amplified, and is sent to described mixer; And be used for the compound electric signal that described mixer sends is carried out demodulation, amplification, and be sent to described power splitter;
Described mixer, the signal that is used for described rf board and described database sent merges into one the tunnel, and sends by respective antenna; And be used to receive the signal that described respective antenna sends, and described signal is carried out shunt according to standard, the signal after shunt is sent to corresponding rf board and database.
2. device according to claim 1, it is characterized in that, also comprise monitoring module, described monitoring module is used for one or more information of described optical-electrical converter, described rf board, described database is gathered, and utilizes the information that collects that it is monitored.
3. device according to claim 2 is characterized in that described monitoring module also is used for the one or more information according to the described optical-electrical converter that is collected, described rf board, described database, and it is controlled.
4. according to each described device in the claim 1 to 3, it is characterized in that, described rf board comprises: band pass filter, power amplifier, dielectric duplexer and low noise amplifier, wherein, described band pass filter, be used for filtering and insert other outer signals of signal useful signal, and will be sent to described power amplifier through the signal of filtering;
Described power amplifier is used for the signal that described band pass filter sends is amplified, and is sent to described duplexer;
Described duplexer is used for realizing by different dielectric resonant chambers the separation of up-downgoing frequency;
Described low noise amplifier is used to realize that the low noise of upward signal amplifies.
5. device according to claim 4 is characterized in that, described band pass filter is a Surface Acoustic Wave Filter.
6. according to each described device in the claim 1 to 3, it is characterized in that described database comprises: the demodulation submodule, separate frame submodule, framing submodule, modulation submodule and AP submodule, wherein,
Described demodulation submodule is used for received signal is demodulated to frame signal, and described frame signal is sent to the described frame submodule of separating;
The described frame submodule of separating is used for the frame signal that described demodulation submodule sends is reduced to data-signal, and described data-signal is sent to described AP submodule;
Described AP submodule is used for received digital signal is modulated;
Described framing submodule is used for the data-signal that described AP submodule sends is converted to frame signal, and this frame signal is sent to described modulation submodule;
Described modulation submodule is used for the frame signal that described framing submodule sends is modulated to selected carrier frequency.
7. according to claim 2 or 3 described devices, it is characterized in that described monitoring module comprises: core processing submodule, information gathering submodule, protocol conversion submodule, wherein,
Described information gathering submodule is used to carry out the collecting work of monitor message;
Described core processing submodule is used for the monitor message that described information gathering submodule is collected is converted to digital signal, and described digital signal is sent to described protocol conversion submodule;
Described protocol conversion submodule, but be used for the digital signal that described core processing submodule is sent is converted to recognition instruction.
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Cited By (4)
* Cited by examiner, † Cited by third party| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102300219A (en) * | 2011-08-16 | 2011-12-28 | 武汉安德瑞科技有限公司 | Far-end micropower access system used for mobile communication signal elevator coverage and method thereof |
| CN102547772A (en) * | 2010-12-24 | 2012-07-04 | 中国移动通信集团北京有限公司 | Method and device for signal distribution system shared by plurality of communication networks |
| CN103731213A (en) * | 2012-10-11 | 2014-04-16 | 洛阳博特自动化工程有限公司 | Optical fiber converter |
| CN111770505A (en) * | 2020-07-08 | 2020-10-13 | 展讯通信（上海）有限公司 | Communication control unit, near-end connection module, far-end covering module and indoor distribution system |
-
2009
- 2009-12-31 CN CN2009203508388U patent/CN201590911U/en not_active Expired - Fee Related
Cited By (6)
* Cited by examiner, † Cited by third party| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102547772A (en) * | 2010-12-24 | 2012-07-04 | 中国移动通信集团北京有限公司 | Method and device for signal distribution system shared by plurality of communication networks |
| CN102547772B (en) * | 2010-12-24 | 2014-09-10 | 中国移动通信集团北京有限公司 | Method and device for signal distribution system shared by plurality of communication networks |
| CN102300219A (en) * | 2011-08-16 | 2011-12-28 | 武汉安德瑞科技有限公司 | Far-end micropower access system used for mobile communication signal elevator coverage and method thereof |
| CN103731213A (en) * | 2012-10-11 | 2014-04-16 | 洛阳博特自动化工程有限公司 | Optical fiber converter |
| CN111770505A (en) * | 2020-07-08 | 2020-10-13 | 展讯通信（上海）有限公司 | Communication control unit, near-end connection module, far-end covering module and indoor distribution system |
| CN111770505B (en) * | 2020-07-08 | 2021-09-14 | 展讯通信（上海）有限公司 | Communication control unit, near-end connection module, far-end covering module and indoor distribution system |
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