25-08-2017, 09:32 PM
Introduction
This item can be used in apartments, hotels, offices, public buildings etc. two-way call and intercom. convenient customer visiting, and strengthening the safety, in the security base for your domestic outfit of a person of extraordinary powers cartilage, increase window.
Basic point-to-point communication
• A traditional point-to-point link is a communications medium with exactly two endpoints and no data or packet formatting. The host computers at either end had to take full responsibility for formatting the data transmitted between them. The connection between the computer and the communications medium was generally implemented through an RS-232 interface, or something similar. Computers in close proximity may be connected by wires directly between their interface cards .
• When connected at a distance, each endpoint would be fitted with a modem to convert analog telecommunications signals into a digital data stream. When the connection used a telecommunications provider, the connections were called a dedicated, leased, or private line. The ARPANET used leased lines to provide point-to-point data links between its packet-switching nodes, which were called Interface Message Processors.
• Modern point-to-point communication
• In (2003), the term point-to-point telecommunications relates to fixed wireless data communications for Internet or Voice over IP via radio frequencies in the multi-gigahertz range. It also includes technologies such as laser for telecommunications but in all cases expects that the transmission medium is line of sight and capable of being fairly tightly beamed from transmitter to receiver. The Telecommunications Industry Association's engineering committees develop U.S. standards for point-to-point communications and related cellular tower structures.[1] Online tools help users find if they have such line of sight.[2]
• The telecommunications signal is typically bi-directional, either time division multiple access (TDMA) or channelized.
• In hubs and switches, a hub provides a point-to-multipoint (or simply multipoint) circuit which divides the total bandwidth supplied by the hub among each connected client node. A switch on the other hand provides a series of point-to-point circuits, via microsegmentation, which allows each client node to have a dedicated circuit and the added advantage of having full-duplex connections.
Function
Internal line phone call the intercom, convenient operation. indoor without buttons, as long as hand up the microphone, can call outdoor , both sides of the clear communication, there is two intercom calls such as special line,fashion and elegant appearance, installation is very simple, direct access 220V power supply ,the bell ring loudly and clearly.
As long as the extension cable conductor material is good, effective distance can be as high as 500 m intercom-1000 m , remain to be clear communication, the product quality is very reliable, low voltage power supply security communication convenient, it is the first choice of realizing internal communication products.
Still can control unlock , and don't need to run outside for opening door.
Wire connection
• Master Station or Base Station – These are units that can control the system, i.e., initiate a call with any of the stations and make announcements over the whole system.
• Sub-station – Units that are capable of only initiating a call with a Master Station but not capable of initiating calls with any other stations (sometimes called slave units)
• Door Station – Like sub-stations, these units are only capable of initiating a call to a Master Station. They are typically weather-proof.
• Intercom Station – Full-featured remote unit that is capable of initiating and receiving party-line conversation, individual conversation and signalling. May be rack-mounted, wall-mounted or portable.
• Wall Mount Station – fixed-position intercom station with built-in loudspeaker. May have flush-mounted microphone, hand-held push to talk microphone or telephone-style handset.
• Belt Pack – portable intercom station worn on the belt such as an interruptible feedback (IFB) with an earpiece worn by talent.
• Handset – permanent or portable telephone-style connection to an intercom station. Holds both an earpiece and a push to talk microphone.
• Headset – portable intercom connection from a belt pack to one or both ears via headphones with integrated microphone on a boom arm. Connects to a belt pack.
• Paging Signal – An audible and/or visual alert at an intercom station, indicating that someone at another station wants to initiate a conversation.
• Power Supply – Used to feed power to all units. Often incorporated into the design of the base station.
Directions for use
• Plug into 220V AC power.or insert 4 cells of R6P SIZE AA1.5V (alkaline) into the cabinet of either one of the talkback pair.
• When you want to have a talk with the other, press down the push button and bell of his or her set will ring no matter whether you take up you handset or not .
• While talking, please speak into the microphone.
• When the talk is over, put back the handset, see it that the pilot light is off, or else the talkback set is still in working condition and continue to consume electricpower.
• Our talkbacks are convenient to connect by means of twin conductor in common use, while connecting
please pay attention to the colour of the two different conductors.
• The effective talkback distance is 3 kilometres, with wire resistance less than 60 ohms.
• The ring sounds level can be selected.
BLOCK DIAGRAM OF SIMPLE INTERCOM SYSTEM
Specifications
• For Multi Apartment, Condominium & Villa system,
• Audio conversation w/ visitors
• Door releasing
• Call& intercom w/ guard center
• For Multi apartment, condominium &villa system,
• Audio conversation w/ visitors
• Door releasing
• Call&intercom w/ guard center
• Gental electronic sound,
Electronic Circuit of intercom
Parameters
1. Output sensitivity <60mV ( frequency 1000 Hz )
2. frequency response ±3dB ( 300Hz-3400Hz )
3. noise voltage <10mV
4. ring sound level >70dB ( AT 0.5m )
5. quiescent current <5uA
6. intercom working current <100mA
Original Circuit Layout
CIRCUIT DIAGRAM
Wire connection