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SYSTEM OVERVIEW
INTERCOM SYSTEMS
When planning an intercom system to communicate between remote points in a facility, it is important to remember that these are “complete systems”, and the parts are generally not interchangeable between systems.
Often these systems have multiple remote points that are in a variety of environments so you must select a system with stations that are right for each of the selected environments.
These systems usually have a central communications monitor point allowing a single individual to receive calls from many locations usually to classify requests to enter a facility and decide on access control.
PURPOSE OF INTERCOM SYSTEMS
Intercom system devices are designed to allow someone at a remote location to signal another person and make a request.
So in planning your intercom system consider the circumstance of the caller. Will they be carrying heavy objects (?) will they be in a vehicle (?) will others be around that you might not want to hear both sides of the conversation(?).
These factors and more will help you decide which type of station is right for each application.
Some may require hands free functions while others might require the privacy of a handset.
INTERCOMS WITH MORE THAN TWO STATIONS
In some cases the intercom system allows communications with a single point but there are also applications where there are multiple receiving stations.
If you have a 24/7 guard post and the guard is the only person permitted to grant access to visitors, a centralized intercom system would probably meet your needs.
But if you have multiple users that can grant access to a visitor, you may want to use an intercom device called a telephone access system. This product works through telephone lines and permits multiple stations to receive intercom calls and grant access remotely by using the keypad on their touchtone telephone.
The telephone access intercom system is connected to an ordinary telephone line or PBX telephone line and has automatic dialers embedded in the circuitry.
The user locates a “code” on the electronic directory of the intercom system, keys in the appropriate code and that code is linked to a telephone number that is dialed by the automatic dialer.
CABLE SELECTION FOR INTERCOM SYSTEMS
Other elements to consider when planning your new intercom system include the type of cable used to interconnect the devices.
The quality of the audio can be significantly affected by cabling and it is important to follow the manufacturer’s recommended cable specifications.
When running the cable, you should inform your installer about the location of high power lines and florescent ballast.
Both of these devices can induce noise on the circuit through a characteristic called RFI or Radio Frequency Interference.
RFI is present in all electrical and electronic transmissions but is more prevalent in high voltage circuits and florescent ballasts.
If you run your intercom circuits in close proximity to the devices it will likely induce a hum or other unwanted noise on the circuit.
They should be avoided whenever possible.
Noise can also be introduced on the circuit by EMI or Electro Mechanical Interference. This happens as a result of high powered machinery operating near an intercom circuit. Where possible these environments should also be avoided.
Careful planning can help you provide an effective and long lasting system.
Noise can also be introduced on the circuit by EMI or Electro Mechanical Interference. This happens as a result of high powered machinery operating near an intercom circuit. Where possible these environments should also be avoided.
Careful planning can help you provide an effective and long lasting system.
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