Wired Intercom Systems

This section aims to clarify the complexities you'll encounter while searching for the right intercom or door phone system. Here, we briefly explain the underlying technology behind each system and outline their pros and cons.

Master to Substation Intercoms

Some systems feature a "master" station that can call multiple substations, while substations can only call the master station, not each other. In some cases, additional master stations can be added to call each other, but this requires installing cables with more wire pairs for multiple communication channels. Systems like the Cat-5 system described below treat all stations as master stations, allowing calls to any station.

Voice communication systems transmit and receive data using either half-duplex or full-duplex transmission methods. The push-to-talk "walkie-talkie" system functions by having users press a button to talk and release it to listen since it stops simultaneous conversations. Full-duplex communication systems in telephones enable simultaneous speaking for all participants. In our 2-wire master to substation intercom systems we use half-duplex communication which allows people at the substation to talk without pressing a button.

Cat-5 Intercom Systems

Cat-5, short for Category 5, is a type of bundled wire typically used for data networks, consisting of four twisted pairs of copper wire. These systems often use internet protocols and can operate on existing networks or as self-contained systems. Cat-5 intercom systems, which use this wiring, generally offer more features due to digital communication between stations. Cat-5 wire is widely available at building supply stores since it is routinely installed for computer and telephone networks.

Handset to Handset Intercoms

Basic 2-wire handsets can be used to communicate directly with each other. Lifting the handset on one side rings the other side. Some systems support more than two phones, causing all connected phones to ring simultaneously.

Phone Intercoms

Phone intercoms utilize analog or VoIP telephone lines to place calls whenever someone lifts the handset. These systems which operate as "hotline intercoms" dial a designated phone number whenever the handset is lifted while functioning with both analog and VoIP telephone systems.