CN101431347A - Wireless distributed equipment and system and signal transmission method - Google Patents
Wireless distributed equipment and system and signal transmission method Download PDFInfo
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- CN101431347A CN101431347A CNA2008102196618A CN200810219661A CN101431347A CN 101431347 A CN101431347 A CN 101431347A CN A2008102196618 A CNA2008102196618 A CN A2008102196618A CN 200810219661 A CN200810219661 A CN 200810219661A CN 101431347 A CN101431347 A CN 101431347A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
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Abstract
本发明实施例公开了一种无线分布式设备，包括：通信模块，用于与另一设备交互数据信号；电源模块，用于对所述另一设备输入电流；或用于对所述无线分布式设备输出电流；信号分离复用模块，用于将所述通信模块中交互的数据信号和电源模块中的对另一设备输入的电流复用在同根传输线缆中传输给所述另一设备；或用于接收所述另一设备复用在同根传输线缆中的数据信号和电流，将所述数据信号和电流分离出，并将分离出的数据信号发送至通信模块，将分离出的电流发送至所述电源模块；滤波模块，所述滤波模块位于所述电源模块和所述信号分离复用模块所在的线路上，所述滤波模块用于过滤所述电源模块中电流的噪声。本发明实施例还公开了一种系统和方法。
The embodiment of the present invention discloses a wireless distributed device, including: a communication module, used to exchange data signals with another device; a power module, used to input current to the other device; The output current of the type device; the signal separation and multiplexing module is used to multiplex the interactive data signal in the communication module and the current input to another device in the power module and transmit it to the other device in the same transmission cable ; or for receiving the data signal and current multiplexed in the same transmission cable by the other device, separating the data signal and the current, and sending the separated data signal to the communication module, and separating the separated data signal The current is sent to the power module; a filter module, the filter module is located on the line where the power module and the signal separation and multiplexing module are located, and the filter module is used to filter the noise of the current in the power module. The embodiment of the invention also discloses a system and a method.
Description
Technical field
The present invention relates to the communications applications field, relate in particular to a kind of wireless distributed equipment and system and the method for input current and data-signal in base station system.
Background technology
Wireless distributed equipment is meant distributed base station, WAP (wireless access point) (Access Point, AP) and equipment such as microwave, these equipment need and control appliance is used, but need to control these distributed apparatus by control appliance by physical connection supply power and data-signal.General, the base station need be arranged on cat head or electric pole or the outdoor wall, control appliance is arranged on indoor machine room, need be connected control appliance and wireless distributed equipment with data wire by power line.
Fig. 1 shows existing wireless distributed equipment system architecture diagram, base station controller and the antenna and the base station that are distributed on the electric pole have been comprised, wherein antenna is connected by the antenna feeder cable with the base station, carry out data communication by optical fiber or signal cable between base station and base station controller, carry out the transmission of electric current by power line.By this distributed apparatus, need two cables transmit power supply and data-signal respectively, because these two cables all are to be distributed in outdoorly, need consider the wiring situation of two cables, required installation cost height simultaneously.If in distributed system,, then need to use optical module in base station in distributed system architecture and the base station controller, but the optical module failure rate is than higher by optical fiber transmission signal.
Summary of the invention
The embodiment of the invention provides the method for a kind of wireless distributed equipment and system and signal transmission, only make between wireless distributed equipment and need just can transmit power supply and signal simultaneously, and solved that wireless distribution system internal cause current noise disturbs and can't be by the control of data-signal realization to control appliance by the single line cable.
The embodiment of the invention provides a kind of wireless distributed equipment, comprising:
Communication module is used for and another equipment interaction data signal;
Power module is used for described another equipment input current; Or be used for described wireless distributed equipment output current;
The Signal Separation Multiplexing module, the current multiplexing to another equipment input that is used in data-signal that described communication module is mutual and the power module is transferred to described another equipment in the root transmission cable; Or be used for receiving that described another equipment is multiplexing at data-signal and electric current with the root transmission cable described data-signal and current separation is gone out, and isolated data-signal is sent to communication module, isolated electric current is sent to described power module;
Filtration module, described filtration module are positioned on the circuit at described power module and described Signal Separation Multiplexing module place, and described filtration module is used for filtering the noise of described power module electric current.
Accordingly, the embodiment of the invention has also proposed a kind of wireless distribution system, comprises remote end module and local module, and described local module is by controlling remote end module to remote end module input current and data-signal, wherein:
Described local module is used for the electric current of described local module and multiplexed data signal are used in being transferred to described remote end module in the root transmission cable, and filters out the noise that is input to electric current on the remote end module before multiplexing electric current and data-signal;
Described remote end module is used for receiving described local module reuse at data-signal and electric current with the root transmission cable, coming out with data-signal in the root transmission cable and current separation multiplexing, and filter current is separated the noise on the cable of after-current place.
Accordingly, the embodiment of the invention has also proposed a kind of method to base station system input current and data-signal, comprising:
Receive the data-signal and the electric current that send, described data-signal and electric current are multiplexed in the root transmission cable;
Multiplexingly going out described with data-signal on the root transmission cable and current separation;
Described method also further comprises:
With the noise filtering in the described electric current, make the transmission line at described data-signal place not be subjected to noise jamming in the electric current.
By wireless distributed equipment and the wireless distribution system that the embodiment of the invention provided, only need between distributed system, to use a transmission cable just energy transmission of data signals and electric current, reduced the use amount of cable, all need planning by original power cable and data cable, only need planning single line cable up till now, make project installation convenient.And to the leaching of noise in the electric current, after the noise in the electric current is leached, avoided noise to enter on the transmission line at data-signal place in the whole system, guaranteed that data-signal is interference-free, guaranteed to transmit the communication quality of whole data-signal.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention 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 some embodiments of the present invention, 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 existing wireless distributed equipment system architecture diagram;
Fig. 2 is the wireless distributed equipment system architecture diagram in the embodiment of the invention;
Fig. 3 is the structural representation of the wireless distributed equipment in the embodiment of the invention;
Fig. 4 is the Signal Separation Multiplexing module structural representation in the embodiment of the invention;
Fig. 5 is the frequency relation distribution map in the Frequency Division Duplexing (FDD) in the embodiment of the invention;
Fig. 6 is another structural representation of the wireless distributed equipment in the embodiment of the invention;
Fig. 7 be in the embodiment of the invention in base station system the method flow diagram of input current and data-signal.
Embodiment
The embodiment of the invention provides the method for a kind of wireless distributed equipment and wireless distribution system and signal transmission, makes equipment room only need just can transmit power supply and signal simultaneously by the single line cable.
Fig. 2 shows the wireless distribution system Organization Chart in the embodiment of the invention, general local module 22 is for being provided with indoor control appliance, control the work of remote end module 21 by local module 22, the local module 22 here can be base station controller or other control appliance, and the remote end module 21 here can be equipment such as distributed base station, AP and microwave.Local module 22 is by controlling remote end module 21 to remote end module 21 input currents and data-signal, the transmission of this electric current and data-signal depends on on the root transmission cable 23, the transmission cable 23 here is the single line cable, is about to electric current and data-signal is all multiplexing transmits on same cable.Concrete, local module 22 is used in electric current and multiplexed data signal on the transmission cable 23, by transmission cable 23 with electric current and data to remote end module 21, the work of control remote end module 21, remote end module 21 need come out data-signal and current separation from transmission cable 23 after receiving data-signal and electric current.Here remote end module 21 also can be to local module 22 feedback data signals, depend on equally with root transmission cable 23, to need the feedback data signal multiplexing on transmission cable 23, to transmit, so when transmission cable 23 with data-signal and current delivery during to local module 22, local module 22 need be separated data-signal from transmission cable 23.Need to prove that the transmission cable 23 here can be a power line, also can be telecommunication cable.In local module 22 or remote end module 21, also need the noise on the circuit of filter current place, can be that local module 22 is filtered, also can be that remote end module 21 filters, also can filter simultaneously, so just the noise on the electric current can be leached, thereby guaranteed the quality of whole communication system.Owing to generally can have noise in the electric current input and output, in the transmission course for big electric current or heavy current, its noise can produce interference to data-signal, directly big electric current or heavy current and multiplexed data signal are used in on the root cable time, it can impact the communication data in local module 22 and the remote end module 21, for communication data interference-free, can when local module 22 input currents, the noise filtering in the electric current be fallen, also need be in remote end module 21 noise in the filter current, avoid the noise in the electric current to enter on the transmission channel at data-signal place.
When in local module 22 and remote end module 21, using same cable to transmit, only need between distributed system, to use same transmission cable just energy transmission of data signals and electric current, reduced the use amount of cable, all need planning by original power cable and data cable, only need planning single line cable up till now, make project installation convenient.And by in local module 22 and/or remote end module 21, the noise in the electric current being filtered, can guarantee mutual communication quality, realize the reciprocal process of data-signal.
Fig. 3 shows the structural representation of the wireless distributed equipment in the embodiment of the invention, comprises local module 30 and remote end module 31, and wherein remote end module 31 is connected by a power line with local module 30.Concrete, local module 30 comprises power module 300, filtration module 301, Signal Separation Multiplexing module 302 and communication module 303, wherein: power module 300 is used for to local module 31 input power supplys; Filtration module 301 is used for filtering the noise of the electric current of power module 300 outputs; Communication module 303 is used for to remote end module 31 input data signals or extracts data-signal that remote end module 31 returns etc.; Signal Separation Multiplexing module 302 is used for multiplexed data signal with the power supply of power module 300 input and communication module 303 inputs and is used on the same power line and transmits, and perhaps the signal that remote end module 31 is returned is separated from power line and fed back to communication module 303.Comprise Signal Separation Multiplexing module 311, filtration module 312, communication module 313 and power module 314 etc. in the remote end module 31.After Signal Separation Multiplexing module 311 in the remote end module 31 is received information from local module 30, promptly by power line data signals transmitted and electric current, electric current and data-signal need be separated, give power module 314 with the current delivery of separating, the data-signal of separating is sent to communication module 313.When if remote end module 31 has data-signal to return to local module 30, need Signal Separation Multiplexing module 311 to need the feedback data signal multiplexing on power line communication module 313, after so local module 30 is received the data-signal that remote end module 31 returns by power line, then from power line, isolate data-signal, data-signal is sent to communication module 303 by Signal Separation Multiplexing module 302.Filtration module 312 mainly is the noise that is used for leaching on the circuit of electric current place, avoids that noise enters communication module 313 in order to avoid influence the communication quality of whole system in the electric current.
When in local module 30 and remote end module 31, using same cable to transmit, only need between distributed system, to use same transmission cable just energy transmission of data signals and electric current, reduced the use amount of cable, all need planning by original power cable and data cable, only need planning single line cable up till now, make project installation convenient.When having reduced the data-signal circuit, correspondingly reduced original data communication module, reduced volume and weight.
Because existing Signal Separation Multiplexing module, it mainly is the separation of signal and multiplexing, substantially do not carry out the filtration of additional noise, therefore be doped with bigger harmonic noise in the electric current of from power module, exporting, because the filtered noise ability of Signal Separation Multiplexing module needs to increase extra filtration module and realizes filtering.Because the switch mode of operation is adopted in power supply input and power supply output as a rule, the existence of this pattern can bring more intense switch first-harmonic and Harmonic Interference, its spectral range arrives number MHz etc. at hundreds of KHz, after filtration module the harmonic filtration that these interference performances are more intense, could guarantee the communication quality of whole system.
Concrete, Signal Separation Multiplexing module in the embodiment of the invention is made of high pass filter and low pass filter, Fig. 4 shows the Signal Separation Multiplexing module in the embodiment of the invention, the Signal Separation Multiplexing module mainly is data-signal and power supply to be compound to together transmit, and the data-signal and the power supply that perhaps will be transmitted in are together separated.The low pass filter here allows electric current to pass through, and very little to the decay of electric current, but does not allow data-signal to pass through.High pass filter is just in time opposite, does not allow electric current to pass through, and only allows data-signal to pass through.Power supply has two kinds at present, and DC power supply and AC power, the frequency of AC power are 50Hz or 60Hz, therefore can with low pass filter by frequency configuration to being higher than 60Hz, but be lower than signal transmission frequencies, in concrete the application, by about 200Hz-500Hz.
Concrete, the communication module 303 in local module 30 can be that power line communication, Digital Subscriber Line are communicated by letter, the coaxial circuit modulator-demodulator with communication module 313 in the remote end module 31.
Power line communication (Power Line Communication, PLC) be to utilize the technology of power line as the data communication medium, present PLC technology is by (the HomePlug PowerlineAlliance of plug-in alliance of family, HPA) the HomePlug standard of appointment, version comprises HomePlug1.0 and HomePlug AV etc.This PLC module can be a PLC Modem (modulator-demodulator), also can be a module that realizes this function.Above-mentioned module or Modem provide other functional modules in an ethernet interface and the Local Control Module to communicate, service data transmission, the perhaps device status data of remote end module, control data etc.
Digital Subscriber Line (Digital Subscriber Line, DSL) scheme has asymmetric digital subscriber line (ADSL) and VDSL, and upgraded version such as ADSL2, ADSL2+, VDSL2, VDSL2+ etc., and its requirement is to come transmission of data signals by a pair of line.The DSL communication module here also can be a DSL modulator-demodulator, or realize the module of this function, this communication module provides other circuit in an Ethernet interface and the Local Control Module to communicate the device status data of service data transmission or remote end module, control data etc.
Coaxial circuit modulator-demodulator (Cable Modem) is to use same coaxial cable to carry out the mode of bidirectional data transfers, is mainly used in a kind of two-way communication transmission means of cable TV network.The CableModem module here can be a Cable Modem (modulator-demodulator), also can be a module that realizes this function.Above-mentioned module or Modem provide other circuit in an Ethernet interface and the Local Control Module to communicate, service data transmission, the perhaps device status data of remote end module, control data etc.
In transmission course, adopt power line to transmit power supply and data-signal simultaneously, this power line has played multiplexing effect.Data-signal has comprised service signal, monitoring of tools and maintenance signal etc.The power line here carries out two-way transfer of data, at duplex mode three kinds of selections can be arranged, and as time division duplex, Frequency Division Duplexing (FDD) and transmission simultaneously, wherein: time division duplex is meant at synchronization to have only an end sending; Frequency Division Duplexing (FDD) is meant that use different frequency band in two ends sends data, does not just produce conflict like this on the circuit, and transmission when realizing data specifically can see the frequency relation distribution shown in Fig. 5 for details; Transmission simultaneously is meant with Echo Cancellation and separates the reception data, as present telephone mode.
Fig. 6 shows another structural representation of the distributed apparatus in the embodiment of the invention, comprises local module 60 and remote end module 61, and wherein remote end module 61 is connected by a power line with local module 60.Concrete, local module 60 comprises power module 601, filtration module 602, Signal Separation Multiplexing module 603, communication module 603, wherein: power module 601 is used for to local module 61 input currents, communication module 604 is used for to remote end module 61 input data signals or extracts data-signal that remote end module 61 returns etc., and Signal Separation Multiplexing module 603 is used for multiplexed data signal with the electric current of power module 601 inputs and communication module 604 inputs and is used on the same power line and transmits.In implementation process, interference-free in order to guarantee the communication module in the distributed system, need the noise of power module 601 input and output be filtered, on the circuit at power module 601 and Signal Separation Multiplexing module 603 places, increase a filtration module 602, this filtration module 602 mainly is not allow noise enter into communication module 604 or communication module 613, the interfere with communications effect, concrete can use a low pass filter.Accordingly; can not cause the damage of components and parts because of overvoltage for the parts of protecting whole distributed system; need be between power line and Signal Separation Multiplexing module 603 a circuit protection module 605 is set; this circuit protection module 605 mainly prevents the high pressure on the circuit; the high pressure of sensing as thunder and lightning; equipment is produced damage; can use piezo-resistance to be parallel on two lines of power line in the specific implementation; when high pressure occurs; piezo-resistance is with regard to conducting; release energy, thereby can the circuit of circuit protection module 605 back not exerted an influence.
After Signal Separation Multiplexing module 614 in the remote end module 61 is received information from local module 60, promptly by power line data signals transmitted and electric current, electric current and data-signal need be separated, give power module 611 with the current delivery of separating, the data-signal of separating is sent to communication module 613.When if remote end module 61 has data-signal to return to local module 60, need Signal Separation Multiplexing module 614 to need the feedback data signal multiplexing on power line communication module 313, after so local module 30 is received the data-signal that remote end module 31 returns by power line, then from power line, isolate data-signal, data-signal is sent to communication module 604 by Signal Separation Multiplexing module 603.In implementation process, interference-free in order to guarantee the communication module in the distributed system, need the noise of power module 611 input and output be filtered, on the circuit at power module 611 and Signal Separation Multiplexing module 614 places, increase a filtration module 612, this filtration module 612 mainly is not allow noise enter into communication module 604 or communication module 613, the interfere with communications effect, concrete can use a low pass filter.Accordingly; can not cause the damage of components and parts because of overvoltage for the parts of protecting whole distributed system; need be between power line and Signal Separation Multiplexing module 614 a circuit protection module 615 is set; this circuit protection module 615 mainly prevents the high pressure on the circuit; a protective circuit of the excessive grade of electric current; thereby prevent the damage of electronic device in the equipment; the high pressure of sensing as thunder and lightning; equipment is produced damage; can use piezo-resistance to be parallel on two lines of power line in the specific implementation; when high pressure occurs; piezo-resistance releases energy with regard to conducting, thereby can the circuit of circuit protection module 615 back not exerted an influence.
Accordingly, Fig. 7 shows in the embodiment of the invention method of input current and data-signal in base station system, and concrete steps are as follows:
Step S701: receive the data-signal and the electric current that send, this data-signal and electric current are multiplexed in the root transmission cable;
Step S702: going out with data-signal on the root transmission cable and current separation with multiplexing.
In the process of step S701 and step S702, also further comprised, with the noise filtering in the electric current, make the transmission line at described data-signal place not be subjected to noise jamming in the electric current.In the specific implementation process, before the step S701, data signal current is multiplexed in before on the root transmission cable, electric current in the input current is filtered, filter out the noise in the electric current, after step S702, the noise of avoiding separating on the circuit of after-current place enters on the transmission channel at data-signal place, also needs the noise on the circuit is filtered.Here finish filtration to noise and mainly be the communication module in the noise access arrangement entity of avoiding in the electric current, the communication quality of interfere with communications module.For the control device and the controlled device of base station system, to the noise filtering in the electric current, controlled device is on the circuit at place behind the separation electric current, to the noise filtering in the electric current in the time of the control device input current.
Need to prove, because the power supply of distributed wireless system generally is under the big current-mode, generally more than 0.5A, the power supply powering mode of the wireless distribution system in the embodiment of the invention can be (48V, 1A), (48V, 2A), (48V, 0.8A) or the like to its supply current.
In sum, the distributed structure/architecture that the embodiment of the invention provided is as long as monitoring just can be implemented to remote end module by local module in the place that can have power line to reach.Between distributed system, use same transmission cable just energy transmission of data signals and electric current, when distributed structure/architecture is carried out signal multiplexing, leach the noise in the power supply, guaranteed the quality of the signal of communication on the Channel Transmission passage, realized that big electric current and data-signal can be transmitted in simultaneously with in the root cable, reduced the use amount of cable, all needed planning by original power cable and data cable, only need planning single line cable up till now, make project installation convenient.When having reduced the data-signal circuit, correspondingly reduced original data communication module, reduced volume and weight.Because the simplification of interface, protection such as lightning protection have reduced the infringement to equipment such as thunder and lightning.
Above disclosed is a kind of preferred embodiment of the present invention only, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential hardware platform, can certainly all implement by hardware.Based on such understanding, all or part of can the embodying that technical scheme of the present invention contributes to background technology with the form of software product, this computer software product can be stored in the storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008102196618A CN101431347A (en) | 2008-12-04 | 2008-12-04 | Wireless distributed equipment and system and signal transmission method |
| PCT/CN2009/075259 WO2010063234A1 (en) | 2008-12-04 | 2009-12-02 | Wireless distributed apparatus and system and signal transmission method |
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| CNA2008102196618A CN101431347A (en) | 2008-12-04 | 2008-12-04 | Wireless distributed equipment and system and signal transmission method |
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| WO (1) | WO2010063234A1 (en) |
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| WO2010063234A1 (en) * | 2008-12-04 | 2010-06-10 | 华为技术有限公司 | Wireless distributed apparatus and system and signal transmission method |
| CN101902256A (en) * | 2010-07-30 | 2010-12-01 | 广东广联电子科技有限公司 | Communication method and network device based on power line access |
| CN102651874A (en) * | 2011-02-25 | 2012-08-29 | 中国移动通信集团公司 | Signal transmission method, system and device for indoor distribution system |
| WO2013185688A1 (en) * | 2012-07-25 | 2013-12-19 | 中兴通讯股份有限公司 | Data transmission method and system |
| CN103973336A (en) * | 2013-01-30 | 2014-08-06 | 中兴通讯股份有限公司 | Electronic devices, device and method for transmitting signals among electronic devices and communication system |
| CN104377673A (en) * | 2013-08-13 | 2015-02-25 | 中兴通讯股份有限公司 | Surge protective device and method |
| CN105379092A (en) * | 2013-07-11 | 2016-03-02 | 高通股份有限公司 | Switching power supply with noise control |
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| WO2018168282A1 (en) * | 2017-03-15 | 2018-09-20 | 株式会社村田製作所 | Circuit module, network module, and automotive electronic device |
| CN110430106A (en) * | 2019-07-17 | 2019-11-08 | 陕西千山航空电子有限责任公司 | A kind of airplane power source signal multiplexing bus and its transmission circuit |
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| ITMI981699A1 (en) * | 1998-07-23 | 2000-01-23 | Alsthom Cge Alcatel | METHOD AND DEVICE FOR BIDIRECTIONAL DATA EXCHANGE LONG LOW AND MEDIUM VOLTAGE ELECTRICAL LINES |
| JP2004266634A (en) * | 2003-03-03 | 2004-09-24 | Tdk Corp | Modem for power line communication |
| US8199798B2 (en) * | 2006-07-24 | 2012-06-12 | Siemens Aktiengesellschaft | Method and modem for subsea power line communication |
| CN101431347A (en) * | 2008-12-04 | 2009-05-13 | 华为技术有限公司 | Wireless distributed equipment and system and signal transmission method |
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- 2009-12-02 WO PCT/CN2009/075259 patent/WO2010063234A1/en active Application Filing
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| WO2010063234A1 (en) * | 2008-12-04 | 2010-06-10 | 华为技术有限公司 | Wireless distributed apparatus and system and signal transmission method |
| CN101902256A (en) * | 2010-07-30 | 2010-12-01 | 广东广联电子科技有限公司 | Communication method and network device based on power line access |
| CN102651874A (en) * | 2011-02-25 | 2012-08-29 | 中国移动通信集团公司 | Signal transmission method, system and device for indoor distribution system |
| CN102651874B (en) * | 2011-02-25 | 2014-10-08 | 中国移动通信集团公司 | Signal transmission method, system and device for indoor distribution system |
| WO2013185688A1 (en) * | 2012-07-25 | 2013-12-19 | 中兴通讯股份有限公司 | Data transmission method and system |
| CN103581925A (en) * | 2012-07-25 | 2014-02-12 | 中兴通讯股份有限公司 | Method and system for data transmission |
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| CN104377673A (en) * | 2013-08-13 | 2015-02-25 | 中兴通讯股份有限公司 | Surge protective device and method |
| WO2018168282A1 (en) * | 2017-03-15 | 2018-09-20 | 株式会社村田製作所 | Circuit module, network module, and automotive electronic device |
| US11050403B2 (en) | 2017-03-15 | 2021-06-29 | Murata Manufacturing Co., Ltd. | Circuit module, network module, and in-vehicle electronic device |
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| CN110430106A (en) * | 2019-07-17 | 2019-11-08 | 陕西千山航空电子有限责任公司 | A kind of airplane power source signal multiplexing bus and its transmission circuit |
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|---|---|
| WO2010063234A1 (en) | 2010-06-10 |
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Application publication date: 20090513 |