CN2620447Y - Mainframe using telephone program control exchanger as gate inhibition interphone system for entrance of housing estate - Google Patents

Mainframe using telephone program control exchanger as gate inhibition interphone system for entrance of housing estate Download PDF

Info

Publication number
CN2620447Y
CN2620447Y CN 02272071 CN02272071U CN2620447Y CN 2620447 Y CN2620447 Y CN 2620447Y CN 02272071 CN02272071 CN 02272071 CN 02272071 U CN02272071 U CN 02272071U CN 2620447 Y CN2620447 Y CN 2620447Y
Authority
CN
China
Prior art keywords
telephone
exchanger
resident family
terminal
sub
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.)
Expired - Fee Related
Application number
CN 02272071
Other languages
Chinese (zh)
Inventor
佘伟强
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to CN 02272071 priority Critical patent/CN2620447Y/en
Application granted granted Critical
Publication of CN2620447Y publication Critical patent/CN2620447Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Abstract

Disclosed is a telephone exchanger as the host computer of the district door-entry control talkback system, overcoming a plurality of defects caused by parallel connecting occurred in the prior directly-pressing and digital host computers of door-entry control talkback system. An independent pair of lines are employed between the host computer and each resident, which enables the telephone exchanger to supply the electricity collectively to the resident terminal telephones; and the work of the entire system is assured when the alternating current is not supplied, providing that the backup battery of the telephone exchanger host works. Problems such as line short circuit of individual households and the entire system failure or telephone exchanger damage caused by short circuit are avoided because of the characteristics of the telephone exchanger, after the electricity is collectively supplied to the terminal telephones. The households can use the same common standard terminal telephone with the outside connection and the inside connection through the household exchanger. The entry controlling door is opened by the on-line DTMF (dual tone) decoder on the door telephone circuit which detects the particular DTMF (dual tone) signal (a preset one or a plurality of standard DTMF (dual tone) signals when designing) transmitted by the standard DTMF (dual tone) telephone after the resident answered the call from the door telephone, and controls the opening or starting of the electric lock and the related equipment. Moreover, the networking and expansion between the telephone exchangers are much more convenient than the traditional directly-pressing and digital host computers.

Description

With the main frame of telephone exchanger as sub-district gate inhibition's intercom system
Affiliated technical field
The utility model relates to the technical scheme of a kind of sub-district gate inhibition's intercom system structure.Be particularly related to and utilize the telephone exchanger technology as the inside intercommunication of residential quarters and gate inhibition usefulness for visitor's opening door of remote-control.
Background technology
At present, gate inhibition's intercom system of generally using in China mainly is divided into " direct press type " and " digital-code type ".But be that " direct press type ", " digital-code type " all need to adorn a station terminal telephone set in addition at resident family's family now.Like this, resident family's family also need have another " telephone for special use " that can only be used in gate inhibition's intercommunication, and must be placed on the side of seeing easily except an outside line machine.Bring a lot of problems for user's decoration.Use also very inconvenient.The supporting terminal phone that " direct press type " and " digital-code type " intercom system is used, because the program controlled telephone series of the criteria of right and wrong, so must more can not be replaced with " cordless telephone " etc. by resident family voluntarily according to the supporting different terminal phone of the main frame of different manufacturer production.On the other hand, now along with the development of society and improving constantly of living standards of the people, the area of dwelling construction is increasing, as compound unit, villa unit etc.There is the visitor to come each time, all will arrives " telephone for special use " there on entrance and open the door, brought very big inconvenience for the life of resident family for the visitor.This " direct press type " and " digital-code type " also exist the defective of a system design in addition, have increased many failure rates.We just analyze some ubiquitous problems that exist on the prior art with Figure 10, Figure 11, Figure 12 now.
Figure 10 is 4 buses " direct press type " gate inhibition full talk circuit connection diagram.As shown in the figure: the user terminal phone is that " and connecing " is simultaneously.
Figure 11 is 4 buses " digital-code type " gate inhibition full talk circuit connection diagram.As shown in the figure: the user terminal phone also is that " and connecing " is simultaneously.
Figure 12 is isolator 4 buses " digital-code type " gate inhibition full talk circuit connection diagram between belt.As shown in the figure: user terminal phone or " and connecing " are simultaneously.
Below be (prior art) Figure 10 in the Figure of description, Figure 11, Figure 12 be the system unit of the label correspondence of accompanying drawing separately
1. main frame
2. public ground wire
3. the public words line that send
4. the public line of being talked about
5. the public control line of unblanking
6. main frame backup battery
7. electric lock
8. terminal phone
9. main frame calling terminal phone line
10. zone isolation device
We can analyze prior art earlier by reference Figure 10: the circuit of 4 buses " direct press type " gate inhibition intercom system connects.In this connection layout, each terminal phone (8) be respectively by public ground wire (2), publicly send words line (3), publicly talked about line (4), the public control line of unblanking (5), also have an each household independently by main frame calling terminal phone line (9), be connected to respectively on the terminal phone (8) by main frame (1).Main frame (1) receives the unlock instruction that the public control line of unblanking (5) is sent here, exports of short duration control voltage and opens electric lock (7).Main frame (1) can install main frame backup battery (6) additional.From figure so as can be seen " in parallel in every family ", making has the line short of a family family, just equals the short out road of bus, and signal just can not be delivered to each resident family by main frame, and the signal of each resident family can not be dealt on the main frame equally, will cause the whole system paralysis like this.So parallel connection is sent words, is talked about its call confidentiality and also do not exist.
We analyze prior art again by reference Figure 11: the circuit of 4 buses " digital-code type " gate inhibition intercom system connects.Article 4, bus still exists, and public ground wire (2), publicly send words line (3), is publicly talked about line (4), the public control line of unblanking (5), but also be the method that adopts and connect, and just saves independent main frame calling terminal phone line (9).Terminal phone (8) is whether to open the talk channel of oneself by the address code decision that main frame (1) is sent, and enters the talking state of terminal phone (8) and main frame (1).From scheming us still is " in parallel in every family " as can be seen like this.The line short at one family also can cause the interruption of whole system signal, and causes the paralysis of system.Confidentiality and " direct press type " relatively be that certain improvement has been arranged.
We analyze another prior art again by reference Figure 12: 4 buses " digital-code type " the gate inhibition full talk circuit connection layout of isolator between belt.With Figure 11 ratio, Figure 12 has added zone isolation device (10).Make holding wire and holding wire short circuit no longer influence whole system.As send words line (3) and talked about line (4) short circuit, or talked about the short circuit of line (4) and the control line of unblanking (5).But owing to adopt unified power supply, in case power supply short circuit still can't be avoided the paralysis of the some of whole system or system.As 4 public line short circuits etc.
Also have present partly producer to adopt the method for single household power supply, utilize 220 volts of AC-powered of every household to give " terminal phone ", solve user terminal phone power supply short circuit although it is so and caused the problem of systemic breakdown, but another problem has appearred, when if the Alternating Current Power Supply of man of resident family breaks down exactly, communication is just hindered immediately.This is a very big hidden danger aspect public security.Because everybody is very clear, the master switch of power supply is arranged certainly in the outside of man of resident family.Once Alternating Current Power Supply is destroyed, communication is interrupted immediately.If it obviously is inconvenient at every household backup battery being installed,, or even be difficult to guarantee that all backup batteries all keep operate as normal forever because the maintenance work of battery also is many like this.
In addition gate inhibition's intercom system networking of " direct press type " and " digital-code type " all compare difficulty (networking: refer between building and the building to form the network of a sub-district, can interconnection.Make things convenient for resident family to look for management company, make things convenient for management company to look for resident family on the other hand).At first " direct press type " owing to be call button of every household, and the panel call button number of main frame (1) increases with resident family and increases.So can only one panel of ladder, otherwise the call button of networking machine is many to using." digital-code type " is the main line of employing or 2 lines or 4 lines or 6 lines etc., and the line of terminal phone (8) all is to be attempted by on this main line.Whether on the function all be that terminal phone (8) is discerned address code signal that corresponding main frame (1) sends identical with the default address code of terminal phone (8), and whether the open a terminal communication channel of phone (8) oneself of decision, the voice communication between formation terminal phone (8) and the main frame (1).Because this limitation of design determined more communication channels can not be provided, so network is big more, the user is many more, and communication is easy being obstructed more just.Networking does not have " practical value " extremely yet reluctantly.
Summary of the invention
All drawbacks that existing in order to overcome " direct press type " and " digital-code type " gate inhibition intercom system occur, the utility model provides a kind of technical scheme, both can give each terminal phone by the main frame centrally connected power supply.As long as guarantee the operate as normal of phone programme-controlled exchange main frame backup battery, just can guarantee is not having under the situation of alternating current the operate as normal of whole system like this.Concentrate and power to behind the terminal telephone set, be not afraid of the short circuit of resident family's individual line again by phone programme-controlled exchange main frame.Even the subscriber's line short circuit, also just this user can not communication, will not cause the paralysis of whole system or the damage of telephone exchanger.Resident family can also be combined in outside line and inside line simultaneously by the little telephone exchanger of user, together with a common standard telephone set.Even can select a cordless telephone that conforms with resident family's requirement as terminal phone accepting device voluntarily by resident family.Telephone set be interior lines be again outside line.So both guaranteed the usefulness of sub-district communication and the requirement that the gate inhibition opens the door, while and outside line are kept in touch again.And networking, dilatation are all many easily than traditional " direct press type " and " digital-code type ".Operate also not difficult.
The technical scheme that its technical problem that solves the utility model adopts is (as Fig. 1): a phone programme-controlled exchange exchange at first is installed in residential quarters, present telephone exchanger generally can arbitrarily layout extension [resilient coding], so can compile out extension very clocklike according to the building of resident family number, ladder number, level number, room number fully, be convenient to memory and use.Draw a pair of interior lines separately for every household according to the requirement of telephone exchange.At this moment every household has had a pair of independently interior lines and a pair of independently outside line.Certainly two other telephone terminals of branch are installed to resident family.But the technical program provides the scheme that further facilitates resident family.Here not the terminal of answering the call respectively, but interior and exterior lines is received in two " the outer line interfaces " of " the little telephone exchanger of resident family ", pick out telephone set from " extension set mouth " again and use to resident family.Resident family only needs a common standard telephone set just can answer the calling of interior and exterior lines simultaneously like this, and respectively by interior lines or outside line Outgoing Call.The solution of gate inhibition's opening door of remote-control is: deleted " # " or " * " keyboard in " doorway telephone set " dial.Doing so can not influence the visitor and dial inside line and give resident family, but the visitor can not initiatively dial " # " or " * " keyboard [sending corresponding double-audio signal] in the telephone set of doorway.Resident family receives visitor's incoming call, need open the door for it, only need click " # " or " * " keyboard, by online " double-tone is decoder frequently " [one very mature technique], just detects very much " # " or " * " easily.And output control " electric lock " instruction simultaneously, door is opened.The largest benefit of doing like this is: at first must be after having set up the conversation of interior lines and doorway telephone set, when online double-tone frequency decoder just can detect the double-audio signal of " # " or " * ", just have the action of opening the door.Otherwise the talking state that does not have interior lines and doorway telephone set usually.Also can't be even if " # " or " * " pressed in resident family opening the gate.Secondly can also be with the different gate of same key control.After annotating family terminal telephone set and that doorway telephone set foundation conversation, just can remote control open corresponding gate.
Utilize a pair of interior lines, both can transmit both sides' voice, call out the tinkle of bells, can power to the terminal telephone set again.And owing to be the line of independently pulling out from telephone exchange, definitely do not have " common fault in parallel ": a family short circuit, whole system communicating interrupt.On the other hand, the design of telephone exchanger has determined it is can not cause the damage of machine or the paralysis of system because of resident family's line short.
The method of independent wiring also is so so difference is little, also can not increase too big workload in the system of " direct press type " main frame like this.
Also having an advantage with telephone exchanger as sub-district gate inhibition's intercom system is exactly can many people's while INCOM intercoms.The technical scheme that performance characteristics decision the utility model of telephone exchange provides can be conversed by multichannel simultaneously.As: the same seat same time of building, 301 are answering the incoming call of telephone door machine downstairs; 302 can directly find some service departments of administrative office to report situations by inside line; 303 answer the incoming call from gate, sub-district visitor again.This is that " direct press type " and " digital-code type " all can't be accomplished, they at most all can only provide the passage of a channel to user's use and one road call manager place.
Networking mode easily.If we are not whole sub-districts a phone programme-controlled exchange exchange only is not installed, but a telephone exchanger is adorned as main frame in a building, wiring is just simple and convenient many like this, because do like this, does not need the extension line in all each buildings is all concentrated in total main equipment room.Such networking has dual mode.Advanced switch is as " office exchange " etc.Can network by optical fiber.Networking as present telecommunication telephone exchange between machine room and the machine room.If not higher telephone exchanger, the outer line interface of (building) telephone exchanger that also can be by each building is linked specific " the extension set mouth " of " Service Phone stored-program control exchange ", also can form a very practical subzone network (as Fig. 2).Resident family's method of operation is as follows:
Transfer to: telephone set is mentioned by resident family, select interior lines from the little telephone exchanger of resident family earlier, (most telephone exchanger all is to allow the extension set mouth select to connect the outside line mouth of telephone exchanger automatically by " 9 " or " 0 " to select " the outside line mouth " of building telephone exchanger by " 9 " or " 0 ", if not, practical operation explanation according to concrete telephone exchanger is dialled), the terminal telephone set of resident family inserts the extension set mouth of " Service Phone stored-program control exchange " at this moment, can operate according to the split plant operation method of " Service Phone stored-program control exchange ", arbitrarily dial any service extension set port of " Service Phone stored-program control exchange ".
Dial in: as at the gate, sub-district or administrative office to look for any one resident family, dial earlier " building number " (" building number " is the extension number of corresponding " building telephone exchanger " outside line mouth " the Service Phone stored-program control exchange " that connected), at this moment Bo Hao telephone set has entered the building telephone exchanger, the voice suggestion of sending according to " building telephone exchanger " direct inward dialing to extension autom, (also can utilize the direct dial-in system of DISA[] function) again by " level number+room number ", directly ring resident family terminal telephone set is set up conversation at last.In the extension set of same " building telephone exchanger ", look for other resident family's extension sets, directly get final product, as on this doorway, building telephone set, dialing resident family's terminal extension, just directly by " level number+room number " by " level number+room number ".
The beneficial effect of the technical scheme that the utility model provides is, fundamentally improved the reliability of gate inhibition's intercom system, solved up hill and dale " direct press type " and " digital-code type " owing to and connect the hard nut to crack that the resident family's family line short that causes can have influence on systemic breakdown.Each household is a pair of inside connections separately, both can power to interior lines terminal phone, can call out and converse again; Centrally connected power supply and be not afraid of resident family's line short; Provide multichannel to use simultaneously to different users by the while talk channel; Simple in structure; Networking is convenient; User family need not the terminal telephone sets beyond telecommunication outside line of many installations, and the terminal telephone set can also be selected according to the hobby of oneself by resident family, makes resident family use more convenient as one wishesly.And the technical program provides " standard DTMF [double-tone frequently] " interface, thus the product of all " standard DTMF [double-tone frequently] " can be connected with it, for the further expansion of systemic-function lays a solid foundation.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 uses technical solutions of the utility model, and telephone exchanger is as the circuit connection diagram of sub-district building gate inhibition intercom system main frame.As shown in the figure: the user terminal phone is not attempted by on one group of bus, but pull out respectively from the telephone exchanger, a pair of line independently.
Fig. 2 is to be Fig. 1 in the Figure of description below the multicomputer netting twine road connection diagram of telephone exchanger as sub-district building gate inhibition intercom system main frame, and Fig. 2 is the system unit (new technology) of the label correspondence of accompanying drawing separately:
1. (building) telephone exchanger
2. telephone exchanger extension set mouth line
3. double-tone decoder frequently
4. electric lock
5. telephone exchanger backup battery
6. (resident family) little telephone exchanger
7. resident family's outside line
8. standard terminal telephone set
9. the outer line interface of (building) telephone exchanger is connected to (service) telephone exchanger extension set mouth line
10. (service) telephone exchanger
11.
Embodiment:
In Fig. 1, at first meet interior lines, sub-district door and count the telephone exchanger (1) of requirement as main frame one of residential quarters installation, and dispose one and overlap telephone exchanger backup battery (5), make telephone exchanger not having under the situation of alternating current, can also guarantee one long period of telephone exchanger operate as normal.Then by the actual design requirement, respectively from telephone exchanger extension set mouth line (2) to each resident family and each Service Phone machine (8), as: the dynamo-electric words of track side telephone machine and door wait the place that needs the inside line communication.Connecting door machine terminal telephone set (8) elder generation and connect double-tone decoder door (3) frequently before.Double-tone frequently decoder (3) export an of short duration voltage signal, the equipment that starts electric lock (4) and be correlated with if onlinely detect specific DTMF double-audio signal instruction [during design default one or more dtmf signals].The outside line of each resident family (7) is that separate cabling arrives each man of resident family respectively, and each tame outside line is not directly linked on the terminal phone.But respectively interior lines, residential quarters (2) and outside line (7) are coupled together by (resident family) little telephone exchanger (6), use same terminal telephone set (8).Telephone exchanger extension set mouth line (2) is connected to resident family's terminal telephone set (8) from the extension set mouth of (resident family) little telephone exchanger (6) respectively.
In Fig. 2 embodiment, the main frame of relatively independent (building) telephone exchanger (1) of many difference as each building arranged.The line that is connected to resident family of (building) telephone exchanger (1) example with Fig. 1 respectively is the same.Different passes through networking line (10) the outer line interface of different (building) telephone exchanger (1), receive respectively on the specific extension mouth of (service) telephone exchanger (11), the extension set mouth butt joint of the outside line mouth of (building) telephone exchanger (1) and (service) telephone exchanger (11) can be the butt joints of organizing [provide multichannel networking after communication channel] more.(building) telephone exchanger (1) is formed a multichannel intercommunication network with (service) telephone exchanger (11) then.General service terminal telephone set (8) can directly be received on the extension set mouth of (service) telephone exchanger (11) by line (2).(service) telephone exchanger (11) also need dispose backup battery (5).Such networking mode singly do not have only interconnecting of (building) telephone exchanger (1) and (service) telephone exchanger (11), can reach by (service) telephone exchanger (11) between (building) telephone exchanger (1) and another (building) telephone exchanger (1 ') yet and interconnect.
Can find out that from the example of Fig. 1 and Fig. 2 each extension set all is independent backguy, can not exist and connect " drawback ".Man of resident family only needs a terminal telephone set just can use outside line and interior lines simultaneously, and can be visitor's opening door of remote-control.As long as all be the telephone exchanger of standard, interconnected networking is very easily as can be seen from Figure 2.Dilatation also can be carried out effective dilatation for " unit " by one (building) telephone exchanger.

Claims (8)

1. main frame that utilizes telephone exchanger as sub-district gate inhibition's intercom system, the extension set mouth of telephone exchanger main frame inserts an outside line mouth of the little telephone exchanger of resident family by line, another outside line mouth of the little telephone exchanger of resident family connects the telecommunication outside line, is connected to the terminal telephone set of resident family then by the extension set eloquence of the little telephone exchanger of resident family.Each extension set of sub-district service point directly picks out the terminal telephone set by telephone exchanger extension set mouth line.It is characterized in that: the telephone exchanger main frame is not directly to link on the terminal telephone set to the extension line of resident family, but adds the outside line of telecommunication again by a little telephone exchanger of resident family, just is connected on the terminal telephone set.The terminal telephone set of resident family just not only can use the telecommunication outside line but also can use programme-controlled telephone system interior lines, sub-district like this.
2. telephone exchanger according to claim 1 is characterized in that as the main frame of sub-district gate inhibition's intercom system: the little telephone exchanger of resident family must have the outer line interface more than 2.
3. telephone exchanger according to claim 1 is characterized in that as the main frame of sub-district gate inhibition's intercom system: the terminal telephone set that resident family uses is standard DTMF (double-tone frequently) ordinary telephone set.
4. telephone exchanger according to claim 1 is characterized in that as the main frame of sub-district gate inhibition's intercom system: the little telephone exchanger of resident family can pass through the keyboard operation of standard DTMF (double-tone frequently) ordinary telephone set and select telecommunication outside line or interior lines, sub-district.
5. telephone exchanger according to claim 1 is characterized in that as the main frame of sub-district gate inhibition's intercom system: be that telecommunication outside line or interior lines, sub-district throw into all be by the terminal ringing telephone stations, and carry machine and can answer the call.
6. telephone exchanger according to claim 1 is as the main frame of sub-district gate inhibition's intercom system, it is characterized in that: resident family's terminal telephone set is the extension set of cell phone stored-program control exchange, all extension functions that can use the cell phone stored-program control exchange to design.
7. main frame that utilizes telephone exchanger as sub-district gate inhibition's intercom system, wherein the extension set of part telephone exchanger is except the terminal telephone set that connects a standard, also again before the telephone set of standard terminal and connect an online DTMF (double-tone frequently) decoder, this terminal telephone set is as the doorway telephone set of gate inhibition's intercommunication.It is characterized in that: after doorway telephone set and resident family's extension set are set up conversation, online DTMF (double-tone frequently) decoder detects specific DTMF (double-tone frequently) signal [or many standard DTMF (double-tone frequently) signal that this specific DTMF (double-tone frequently) is scheduled to when being meant design] that resident family's extension set sends, output control voltage, control door lock and relevant device startup then.
8. telephone exchanger according to claim 7 is characterized in that as the main frame of sub-district gate inhibition's intercom system: resident family can send standard DTMF (double-tone frequently) signal by the terminal telephone set of standard and control corresponding electric lock and start relevant equipment.
CN 02272071 2002-07-29 2002-07-29 Mainframe using telephone program control exchanger as gate inhibition interphone system for entrance of housing estate Expired - Fee Related CN2620447Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 02272071 CN2620447Y (en) 2002-07-29 2002-07-29 Mainframe using telephone program control exchanger as gate inhibition interphone system for entrance of housing estate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 02272071 CN2620447Y (en) 2002-07-29 2002-07-29 Mainframe using telephone program control exchanger as gate inhibition interphone system for entrance of housing estate

Publications (1)

Publication Number Publication Date
CN2620447Y true CN2620447Y (en) 2004-06-09

Family

ID=34238429

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 02272071 Expired - Fee Related CN2620447Y (en) 2002-07-29 2002-07-29 Mainframe using telephone program control exchanger as gate inhibition interphone system for entrance of housing estate

Country Status (1)

Country Link
CN (1) CN2620447Y (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101582954B (en) * 2009-06-18 2011-08-24 福州亚星电子有限公司 Telephone network building talkback alarm system
CN106792278A (en) * 2016-12-06 2017-05-31 江苏黑马高科股份有限公司 A kind of bus broadcast intercom system
CN106791559A (en) * 2016-11-23 2017-05-31 安徽皖拓自动化有限公司 A kind of video intercom networked system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101582954B (en) * 2009-06-18 2011-08-24 福州亚星电子有限公司 Telephone network building talkback alarm system
CN106791559A (en) * 2016-11-23 2017-05-31 安徽皖拓自动化有限公司 A kind of video intercom networked system
CN106792278A (en) * 2016-12-06 2017-05-31 江苏黑马高科股份有限公司 A kind of bus broadcast intercom system

Similar Documents

Publication Publication Date Title
CN201274484Y (en) Digital control system for residual district
CN104753776A (en) Service isolation handling method, device, system, DPU (distributed processing unit) and network adapter
CN201955832U (en) Building intercom system
CN2620447Y (en) Mainframe using telephone program control exchanger as gate inhibition interphone system for entrance of housing estate
CN2882131Y (en) Community interlligent management system based on local network
CN101340603A (en) Building inter-communicating system established by public telephone network
CN201222778Y (en) Public fixed telephone network building visible intercommunication telephone system
CN1960418B (en) Radio communication method dedicated to elevator
CN201207681Y (en) Novel indoor talk-back extension
CN202750150U (en) Gateway apparatus using telephone set as residential quarter interphone extension set
CN202652337U (en) Intelligent visible standard communication protocol stairwell machine
CN201054703Y (en) Building interphone device
CN2476145Y (en) Gate inhibition controller using telephone public net
CN1239007C (en) Wireless network telephone system
CN213586074U (en) Video integrated scheduling system
CN2562512Y (en) Power supply apparatus monitor based on common telephone net
CN2640161Y (en) Building speakerphone without wiring
CN2485869Y (en) Electric door controller with intercom for building with double buses
CN101227535B (en) Method for transmitting data and port conversion equipment
CN201369722Y (en) Interphone for elevator
CN2332794Y (en) Actuator and controller of electric control lock
CN201387633Y (en) Entrance guard computer network control system of visible talkback building
CN2314517Y (en) Door intercom
CN1274130C (en) Communication equipment and method capable of automatically selectively dial-connecting with public switching telephone or network telephone
CN2045558U (en) Trunk type calling and speaking apparatus between principal and subordinate

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
C19 Lapse of patent right due to non-payment of the annual fee
CF01 Termination of patent right due to non-payment of annual fee