CN106788659A - Power distribution automation wireless public network signal enhancing device and distribution terminal equipment - Google Patents

Power distribution automation wireless public network signal enhancing device and distribution terminal equipment Download PDF

Info

Publication number
CN106788659A
CN106788659A CN201611228014.4A CN201611228014A CN106788659A CN 106788659 A CN106788659 A CN 106788659A CN 201611228014 A CN201611228014 A CN 201611228014A CN 106788659 A CN106788659 A CN 106788659A
Authority
CN
China
Prior art keywords
public network
terminal equipment
wireless
switching station
wireless public
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201611228014.4A
Other languages
Chinese (zh)
Inventor
洪海生
林镜星
徐炫东
李绮琳
罗远荣
李茜莹
王亚男
张晏玉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangzhou Power Supply Bureau Co Ltd
Original Assignee
Guangzhou Power Supply Bureau Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangzhou Power Supply Bureau Co Ltd filed Critical Guangzhou Power Supply Bureau Co Ltd
Priority to CN201611228014.4A priority Critical patent/CN106788659A/en
Publication of CN106788659A publication Critical patent/CN106788659A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/14Relay systems
    • H04B7/15Active relay systems
    • H04B7/155Ground-based stations

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention relates to a kind of power distribution automation wireless public network signal enhancing device, including located at outdoor wireless communication module and communication interface;Wireless communication module is placed in the region of the wireless public network network coverage;Wireless communication module is connected by communication interface with the communication interface of switching station terminal equipment located at interior, and the CPU of switching station terminal equipment is connected to by the communication interface of switching station terminal equipment;Wireless communication module receives the order uploaded with electronic station by wireless public network network, and sends commands to CPU by the communication protocol for setting;CPU performs corresponding operation according to the order control switching station terminal equipment, and feedack is sent to wireless communication module, and be forwarded to described information with electronic station by wireless public network network by wireless communication module.The present invention can improve the wireless signal strength that switching station terminal equipment is received.The invention further relates to a kind of distribution terminal equipment that can reduce the distribution network automated installation and debugging time.

Description

Power distribution automation wireless public network signal enhancing device and distribution terminal equipment
Technical field
The present invention relates to distribution network technology field, more particularly to a kind of power distribution automation wireless public network signal enhancing device With a kind of distribution terminal equipment.
Background technology
Distribution automation system can be with computer technology, automatic control technology, electronic technology, the communication technology and new The technological means such as high performance controller switching equipment, power distribution network is carried out offline to be managed with online Intellectualized monitoring.Due to wireless The public network communication advantage such as have region broad covered area, technology maturation reliable, easy to implement, therefore current distribution network automated It is widely used in system, i.e., distribution terminal in distribution network system, with passing through wireless public network between electronic station and distribution main website The communication technology is communicated.However, the base station of wireless public network communication in the more considerations of first stage of construction is traditional call portfolio, Therefore, although the signal coverage rate of wireless public communication network is wide, but still there is the subregion cannot to cover, so also make power distribution automation Distribution terminal in system, be especially located in the electric room of remote districts or the electric room in underground in switching station terminal equipment (DTU), Usually because wireless signal strength is weak or no signal be in off-line state so that the distribution network automated installation and debugging time is significantly Increase.
In order to reduce the distribution network automated installation and debugging time, the wireless signal strength of switching station terminal equipment, mesh are improved Typically by extension passive antenna or raising active antenna gain in terms of the preceding construction in switching station terminal equipment and O&M Mode strengthen wireless signal strength, increase however as antenna length, the decay of antenna can be very serious, therefore, it is existing The wireless signal strength that the antenna pair in stage improves switching station terminal equipment is very limited amount of.
The content of the invention
Based on this, it is necessary to which the wireless signal strength that switching station terminal equipment is improved for antenna pair is very limited amount of asking A kind of topic, there is provided power distribution automation wireless public network signal enhancing device, can conscientiously improve what switching station terminal equipment was received Wireless signal strength.
A kind of power distribution automation wireless public network signal enhancing device, including:Located at outdoor wireless communication module and communication Interface;
The wireless communication module is placed in the region of the wireless public network network coverage;
The wireless communication module is by the communication interface and the communication interface located at indoor switching station terminal equipment Connection, and the CPU of the switching station terminal equipment is connected to by the communication interface of the switching station terminal equipment;
The wireless communication module receives the order uploaded with electronic station by wireless public network network, and logical by what is set Letter agreement sends to the CPU of the switching station terminal equipment order;The CPU of the switching station terminal equipment is according to reception The order arrived controls the switching station terminal equipment to perform corresponding operation, and the letter that will be fed back by the communication protocol Breath sends the letter that will be received by the wireless public network network to the wireless communication module, the wireless communication module Breath is forwarded to described with electronic station.
Above-mentioned distribution network automated wireless public network signal enhancing device by set the wireless communication module with it is described Communication interface modules, and make the wireless communication module by the communication interface and the switching station terminal equipment located at interior Communication interface is connected, and the CPU of the switching station terminal equipment is connected to by the communication interface of the switching station terminal equipment, And the wireless communication module is placed in the region of the wireless public network network coverage of outdoor, therefore, even if switching station's terminal Region where equipment it is weaker without wireless signal or signal intensity, be for example arranged in remote electric room or underground electricity room in open Institute's terminal device is closed, it can also well receive signal by the wireless communication module, so as to improve switching station's end conscientiously The wireless signal strength that end equipment is received, to reduce the distribution network automated installation and debugging time.
Additionally, using the described distribution network automated wireless public network signal enhancing device of above-mentioned setting, not only low cost, body Product is small and easy to use, be convenient for carrying, can be according to the signal intensity of different switching station terminal equipment regions, in peace The distribution network automated wireless public network signal enhancing device is carried to signal is weaker or region of no signal when debuging examination, So that the switching station terminal equipment can receive signal, if the regional signal where certain switching station terminal equipment certainly It is weaker always, it is also possible to which that the distribution network automated wireless public network signal enhancing device is muchly fixed on switching station's end Region where end equipment, so that the switching station terminal equipment can stably receive signal for a long time.
In addition, also providing a kind of distribution terminal equipment.
A kind of distribution terminal equipment, including above-mentioned power distribution automation wireless public network signal enhancing device, and located at room Interior switching station terminal equipment;
The switching station terminal equipment and the power distribution automation wireless public network signal enhancing device wired connection, and pass through The power distribution automation wireless public network signal enhancing device is connected to wireless public network network.
Above-mentioned distribution terminal equipment due to being provided with the power distribution automation wireless public network signal enhancing device, therefore, The power distribution automation wireless public network signal enhancing device can be placed in the wireless public network network of outdoor in use for it The region of covering, even if in this way, the region where the switching station terminal equipment does not have wireless signal, or wireless signal strength Weaker, the switching station terminal equipment can also well be connect by the power distribution automation wireless public network signal enhancing device Wireless signal is received, so as to reduce the distribution network automated installation and debugging time.
Brief description of the drawings
Fig. 1 is the application structure schematic diagram of power distribution automation wireless public network signal enhancing device in one embodiment;
Fig. 2 is the application structure schematic diagram of power distribution automation wireless public network signal enhancing device in one embodiment;
Fig. 3 is the front view of the casing of power distribution automation wireless public network signal enhancing device in one embodiment;
Fig. 4 is that the internal structure of the casing of power distribution automation wireless public network signal enhancing device in one embodiment is illustrated Figure;
Fig. 5 is the top view of the casing of power distribution automation wireless public network signal enhancing device in one embodiment;
Fig. 6 is the side view of the casing of power distribution automation wireless public network signal enhancing device in one embodiment.
Specific embodiment
It is below in conjunction with the accompanying drawings and preferably real further to illustrate the effect of the technological means taken of the invention and acquirement Example is applied, to the technical scheme of the embodiment of the present invention, clear and complete description is carried out.
Refer to Fig. 1 and Fig. 2, a kind of power distribution automation wireless public network signal enhancing device 10, including located at outdoor nothing Line communication module 11 and communication interface 12, wherein, the wireless communication module 11 can be placed in wireless public network network when in use The region of covering, in order to receive wireless signal well;And the wireless communication module 11 can be connect by the communication Mouth 12 is connected with the communication interface 22 located at indoor switching station terminal equipment 20, and by the switching station terminal equipment 20 Communication interface 22 is connected to the CPU21 of the switching station terminal equipment 20.
When installation and debugging are carried out, the wireless communication module 11 can be placed in outdoor, and the wireless public network network coverage Region, afterwards can using holding wire by communication interface 12 respectively by the wireless communication module 11 and switching station's end The CPU21 of end equipment 20 is coupled together, and sets the communication protocol of the CPU21, to realize the switching station terminal equipment 20 With the communication with electronic station 30.Specifically, the wireless communication module 11 can receive the distribution by wireless public network network The order that substation 30 uploads, and sent to the CPU21 order by the communication protocol for setting;And the CPU21 can The switching station terminal equipment 20 is controlled to perform corresponding operation with according to the order for receiving, and by the communication protocols View sends to the wireless communication module 11 feedack, and the wireless communication module 11 can be by described wireless The described information that public network network will be received matches somebody with somebody electronic station 30 described in being forwarded to, to realize distribution network automated installation well Debugging.During this, because the switching station terminal equipment 20 is using wired mode and by the distribution network automated nothing The wireless communication module 11 of line public network signal intensifier and the wireless public network network connection, and the wireless communication module 11 Region that is outdoor and having the wireless public network network coverage is placed in, therefore, even if the region where the switching station terminal equipment 20 It is weaker without wireless signal or signal intensity, be for example arranged in remote electric room or underground electricity room in switching station terminal equipment 20, or electric room region caused by power failure base station or signal amplifier stop transport, it can also be by the nothing Line communication module 11 receives signal well, so as to improve the wireless signal strength that switching station terminal equipment 20 is received conscientiously.
Additionally, using the described distribution network automated wireless public network signal enhancing device of above-mentioned setting, not only low cost, body Product is small and easy to use, be convenient for carrying, can according to the signal intensity of the region of different switching station terminal equipments 20, The distribution network automated wireless public network signal enhancing device 10 is carried to signal weaker or no signal during installation and debugging Region, so that the switching station terminal equipment 20 can receive signal, if certainly where certain switching station terminal equipment 20 Regional signal it is weaker always, it is also possible to the distribution network automated wireless public network signal enhancing device 10 is muchly fixed Region where the switching station terminal equipment 20, so that the switching station terminal equipment 20 can stably receive letter for a long time Number.
In order to further improve the wireless signal strength that switching station terminal equipment 20 is received, in one embodiment, also Can make to be led to using RS485 agreements between the communication interface 22 of the communication interface 12 and the switching station terminal equipment 20 Letter, and the RS485 is to be sent using balance and differential received, therefore not only there is the ability of suppression common mode interference, make described The wireless signal strength enhancing that switching station terminal equipment 20 is received, but also transmission range more long can be ensured, for example 3000 meters, make the transmission between the distribution network automated wireless public network signal enhancing device and the switching station terminal equipment 20 Distance expands, so as to expand the scope of application of the distribution network automated wireless public network signal enhancing device.
Further, in one embodiment, can also make to pass through between the communication interface 12 and the distribution terminal Shielded signal line 15 is connected, further to improve performance and the longevity of the distribution network automated wireless public network signal enhancing device Life.Exemplary, the shielded signal line 15 can use the shielded signal line 15 with power line and holding wire, further , the shielded signal line 15 can also use core for the shielded signal line 15 of 4 or more than 4, to improve signal transmission The life-span of quality and the shielded signal line 15.Further, since the length of the shielded signal line 15 is typically long, such as 50 Rice, therefore, the shielded signal line 15 is carried for convenience, can also be configured to take up the line of the shielded signal line 15 Disk, when the shielded signal line 15 is not used, only need to be wound in the drum by the shielded signal line 15.
Additionally, in one embodiment, exterior aerial 13 can also be set, and the wireless communication module 11 is connected with it Connect, preferably to receive signal.Exemplary, the antennal interface 14 being connected with the wireless communication module 11 can also be set, In order to be connected with the exterior aerial 13.And in order to improve the transmission speed and intensity of signal, may be used also in one embodiment So that the wireless communication module 11 is using the wireless communication module 11 of 4G technologies, and the exterior aerial 13 is using 4G skills The antenna of art.
Fig. 3 to Fig. 6 is referred to, in order that the power distribution automation wireless public network signal enhancing device 10 can make for a long time With in one embodiment, the casing 16 with safeguard functions such as waterproof and dustproofs can also be set up, and make the radio communication Module 11 is mounted in the casing 16 with the communication interface 12, and can be provided with the casing 16 and be connect for the communication The through hole 161 that holding wire between mouth 12 and the communication interface 12 of the switching station terminal equipment 20 is passed through, can also set confession The through hole 162 that holding wire between the exterior aerial 13 and the wireless communication module 11 is passed through.Exemplary, the casing 16 can be made using white steel, to mitigate the weight of the casing 16, carrying is got up convenient, can additionally make the casing 16 is wear-resisting sun-proof.And in order to solve antitheft problem, lockset 163 can also be configured.Specifically, in one embodiment, the case Body 16 can include cabinet, cabinet door and lockset 163, wherein, the chamber door is hinged with the case body, and encloses for accommodating State the accommodating chamber of wireless communication module 11 and the RS485 interfaces;The case body is convexed to form for solid away from the inwall of chamber door The installation portion of the fixed wireless communication module 11;The lockset 163 is installed on the chamber door and the case.Further, Suspender 164 and handle 165 can also be set in the cabinet exterior.
Refer to Fig. 1 and Fig. 2, a kind of distribution terminal equipment, including above-mentioned power distribution automation wireless public network signal enhancing Device 10, and located at indoor switching station terminal equipment 20;Wherein, the switching station terminal equipment 20 is automatic with the distribution Change the wired connection of wireless public network signal enhancing device 10, and connected by the power distribution automation wireless public network signal enhancing device 10 It is connected to wireless public network network.
The distribution terminal equipment due to being provided with the power distribution automation wireless public network signal enhancing device 10, therefore, its In use, the power distribution automation wireless public network signal enhancing device 10 can be placed in the wireless public network network of outdoor The region of covering, even if in this way, the region where the switching station terminal equipment 20 does not have a wireless signal, or wireless signal is strong Degree is weaker, and the switching station terminal equipment 20 can also be by the power distribution automation wireless public network signal enhancing device 10 very Wireless signal is received well, so as to reduce the distribution network automated installation and debugging time.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the invention, and its description is more specific and detailed, but simultaneously Can not therefore be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.

Claims (10)

1. a kind of power distribution automation wireless public network signal enhancing device, it is characterised in that including:Located at outdoor radio communication mold Block and communication interface;
The wireless communication module is placed in the region of the wireless public network network coverage;
The wireless communication module is connected by the communication interface with the communication interface located at indoor switching station terminal equipment, And the CPU of the switching station terminal equipment is connected to by the communication interface of the switching station terminal equipment;
The wireless communication module receives the order uploaded with electronic station, and the communication protocols by setting by wireless public network network Discuss and send to the CPU of the switching station terminal equipment order;The CPU of the switching station terminal equipment is according to receiving The order control switching station terminal equipment performs corresponding operation, and is sent out feedack by the communication protocol The wireless communication module is delivered to, the wireless communication module is turned by the described information that the wireless public network network will be received It is sent to described with electronic station.
2. distribution network automated wireless public network signal enhancing device according to claim 1, it is characterised in that the communication Communicated using RS485 agreements between interface and the communication interface of the switching station terminal equipment.
3. power distribution automation wireless public network signal enhancing device according to claim 1, it is characterised in that the communication connects Connected by shielded signal line between mouth and the distribution terminal.
4. power distribution automation wireless public network signal enhancing device according to claim 3, it is characterised in that also including being used for Take up the drum of the shielded signal line.
5. power distribution automation wireless public network signal enhancing device according to claim 3, it is characterised in that the shielding letter Number line is the shielded signal line with power line and holding wire;
Or the core quantity of the shielded signal line is 4 or more than 4.
6. power distribution automation wireless public network signal enhancing device according to claim 1, it is characterised in that also including with institute State the exterior aerial of wireless communication module wired connection.
7. power distribution automation wireless public network signal enhancing device according to claim 6, it is characterised in that the channel radio Letter module is the wireless communication module using 4G technologies, and the exterior aerial is the antenna using 4G technologies.
8. power distribution automation wireless public network signal enhancing device according to claim 6, it is characterised in that also including with institute The antennal interface of wireless communication module connection is stated, for connecting exterior aerial.
9. power distribution automation wireless public network signal enhancing device according to claim 1, it is characterised in that also include:Case Body;
The wireless communication module is mounted in the casing with the communication interface;
The holding wire that the casing is provided between the communication interface for the communication interface and the switching station terminal equipment is worn The through hole crossed.
10. a kind of distribution terminal equipment, it is characterised in that including:Power distribution automation described in claim any one of 1-9 is wireless Public network signal intensifier, and located at indoor switching station terminal equipment;
The switching station terminal equipment and the power distribution automation wireless public network signal enhancing device wired connection, and by described Power distribution automation wireless public network signal enhancing device is connected to wireless public network network.
CN201611228014.4A 2016-12-27 2016-12-27 Power distribution automation wireless public network signal enhancing device and distribution terminal equipment Pending CN106788659A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611228014.4A CN106788659A (en) 2016-12-27 2016-12-27 Power distribution automation wireless public network signal enhancing device and distribution terminal equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201611228014.4A CN106788659A (en) 2016-12-27 2016-12-27 Power distribution automation wireless public network signal enhancing device and distribution terminal equipment

Publications (1)

Publication Number Publication Date
CN106788659A true CN106788659A (en) 2017-05-31

Family

ID=58921901

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201611228014.4A Pending CN106788659A (en) 2016-12-27 2016-12-27 Power distribution automation wireless public network signal enhancing device and distribution terminal equipment

Country Status (1)

Country Link
CN (1) CN106788659A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107222234A (en) * 2017-07-20 2017-09-29 广州供电局有限公司 The raising method of distribution power automation terminal equipment and its wireless signal strength
CN107425606A (en) * 2017-07-20 2017-12-01 广州供电局有限公司 The raising method of distribution power automation terminal equipment and its wireless signal strength
CN111953073A (en) * 2020-08-13 2020-11-17 国网湖北省电力有限公司咸宁供电公司 Method capable of improving monthly average online rate of distribution automation terminal

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202178771U (en) * 2011-06-10 2012-03-28 辽宁省电力有限公司大连供电公司 Wireless broadband communication management system of distribution network
CN202310113U (en) * 2011-11-01 2012-07-04 深圳市航天泰瑞捷电子有限公司 Terminal equipment debugger and terminal equipment debugging system
CN202471254U (en) * 2012-03-23 2012-10-03 宁海县供电局 Online temperature measuring system for switching station
CN102903221A (en) * 2012-09-21 2013-01-30 五邑大学 Distribution transformer terminal wireless data transmission system for communication signal blind areas
CN105719471A (en) * 2016-03-29 2016-06-29 国网上海市电力公司 Concentrator GPRS (general packet radio service) signal extender
CN106230111A (en) * 2016-03-29 2016-12-14 国网上海市电力公司 A kind of method utilizing power line carrier monitoring power information
CN206370831U (en) * 2016-12-27 2017-08-01 广州供电局有限公司 Power distribution automation wireless public network signal enhancing device and distribution terminal equipment

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202178771U (en) * 2011-06-10 2012-03-28 辽宁省电力有限公司大连供电公司 Wireless broadband communication management system of distribution network
CN202310113U (en) * 2011-11-01 2012-07-04 深圳市航天泰瑞捷电子有限公司 Terminal equipment debugger and terminal equipment debugging system
CN202471254U (en) * 2012-03-23 2012-10-03 宁海县供电局 Online temperature measuring system for switching station
CN102903221A (en) * 2012-09-21 2013-01-30 五邑大学 Distribution transformer terminal wireless data transmission system for communication signal blind areas
CN105719471A (en) * 2016-03-29 2016-06-29 国网上海市电力公司 Concentrator GPRS (general packet radio service) signal extender
CN106230111A (en) * 2016-03-29 2016-12-14 国网上海市电力公司 A kind of method utilizing power line carrier monitoring power information
CN206370831U (en) * 2016-12-27 2017-08-01 广州供电局有限公司 Power distribution automation wireless public network signal enhancing device and distribution terminal equipment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107222234A (en) * 2017-07-20 2017-09-29 广州供电局有限公司 The raising method of distribution power automation terminal equipment and its wireless signal strength
CN107425606A (en) * 2017-07-20 2017-12-01 广州供电局有限公司 The raising method of distribution power automation terminal equipment and its wireless signal strength
CN107222234B (en) * 2017-07-20 2019-08-16 广州供电局有限公司 The improvement method of distribution power automation terminal equipment and its wireless signal strength
CN111953073A (en) * 2020-08-13 2020-11-17 国网湖北省电力有限公司咸宁供电公司 Method capable of improving monthly average online rate of distribution automation terminal

Similar Documents

Publication Publication Date Title
CN102510477B (en) Digital indoor unit and intelligent household security system
CN106788659A (en) Power distribution automation wireless public network signal enhancing device and distribution terminal equipment
CN107810578A (en) Induct over a transmission medium the method and apparatus of fundamental mode
CN107851869A (en) Induct over a transmission medium the method and apparatus of non-fundamental mode
CN207166796U (en) A kind of bus duct temperature acquisition gateway based on NB IoT and LoRa
JP2015522221A (en) Communication signal relay system for building protection
CN107547820A (en) Building talkback entrance guard controlling method and system based on Quick Response Code
CN204808517U (en) Intelligence door and window sensor
CN103002270A (en) Digital indoor unit and intelligent home security system
CN202957929U (en) Digital indoor unit and intelligent home security system
CN104007746A (en) Environment manager control device and electronic equipment
CN206370831U (en) Power distribution automation wireless public network signal enhancing device and distribution terminal equipment
CN106545955B (en) Communication relay device and method and air conditioner
CN202268975U (en) Digital indoor machine and intelligent home furnishing security system
CN203596064U (en) WIFI signal relay doorbell
CN108093379A (en) A kind of train door monitor terminal and its system based on LoRa
CN103078654B (en) Wireless signal dual-mode antenna system, coupling amplification device and signal processing method
CN209676231U (en) A kind of wireless communication module and communication system
CN107578494A (en) A kind of building talkback gate control system and intercom
CN207691805U (en) One kind is exempted to connect up intelligent micropower direct amplification machine
CN207817231U (en) Door and window state detection mechanism and the door monitoring system including the mechanism and household safe burglary-resisting system
CN209170363U (en) A kind of user information transmitting device based on a variety of wireless transmissions
CN207602773U (en) A kind of router antenna
CN206100352U (en) Building wireless walky -talky system
CN102215370A (en) 802.11n-protocol-based wireless video interphone system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20170531

RJ01 Rejection of invention patent application after publication