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Intercom

While every intercom product line is different, most analogue intercom systems have much in common. Voice signals of about a volt or two are carried atop a direct current power rail of 12, 30 or 48 volts which uses a pair of conductors. Signal light indications between stations can be accomplished through the use of additional conductors or can be carried on the main voice pair via tone frequencies sent above or below the speech frequency range. Multiple channels of simultaneous conversations can be carried over additional conductors within a cable or by frequency- or time-division multiplexing in the analogue domain. Multiple channels can easily be carried by packet-switched digital intercom signals.

Portable intercoms are connected primarily using common shielded, twisted pair microphone cabling terminated with 3-pin XLR connectors. Building and vehicle intercoms are connected in a similar manner with shielded cabling often containing more than one twisted pair.

Digital intercoms use Category 5 cable and relay information back and forth in data packets using the Internet protocol architecture.

For installations where it is not desirable or possible to run wires to support an intercom system, wireless intercom systems are available. There are two major benefits of a wireless intercom system over the traditional wired intercom. The first is that installation is much easier since no wires have to be run between intercom units. The second is that you can easily move the units at any time. With that convenience and ease of installation comes a risk of interference from other wireless and electrical devices. Nearby wireless devices such as cordless telephones, wireless data networks, and remote audio speakers, as well as structural features in your building, can all interfere. Electrical devices such as motors, lighting fixtures and transformers can cause noise. There may be concerns about privacy since conversations may be picked up on a scanner, baby monitor, cordless phone, or a similar device on the same frequency. Encrypted wireless intercoms can reduce or eliminate privacy risks, while placement, installation, construction, grounding and shielding methods can reduce or eliminate the detrimental effects of external interference. The United States and Canada have several frequency ranges for wireless intercom systems and other wireless products. They are 49 MHz, FM band (200KH – 270 kHz), 494–608 MHz, 900 MHz, 2.4 GHz, 5.8 GHz, and MURS (150 MHz).

 

The Doorbell Fon is an excellent addition to an existing home or a new home under construction. This product is a great assistance for the elderly, physically impaired or housewife that doesn't want to open their door to a stranger, or has trouble making it to the door to see who the visitor is.

When a visitor presses the button on the door intercom, the Doorbell Fon rings the phones in your home with a distinctive ring. Pick up the phone to converse with the door. If you are on the phone when a visitor arrives a  call-waiting tone will sound to alert you.

Up to 2 intercom stations can be attached. Add the optional lock controller and an electric door strike and you can unlock the door from the phone by pressing the [*] key. Easy 2 wire connection to door intercoms. Works with answering machines and most PBX phone systems. Includes one door intercom station and power supply. 

Key Benefits

• Rings phones in home when door intercom button is pressed
• Pick up the phone to converse with door intercom
• Handles up to 2 door intercom stations

See Instruction manual [pdf format]

  
Copyright © 2011 Jesco Electric Co.
Last modified: 10/19/2011