Four-Wire Intercom: Enhanced Performance and Reliability

A four-wire intercom system uses four individual wires for its operation. This differs from two-wire systems, which transmit both power and communication signals through the same pair of wires. In contrast, a four-wire system employs dedicated wires for power supply and for sending and receiving communication signals.

Key Features

1. Wiring 

Four-wire intercom systems employ four distinct wires for their operation. Two wires are exclusively used for providing power (positive and negative supply), while the remaining two wires are dedicated to transmitting communication signals, including both audio and video data.

2. Separation of Power and Communication 

Four-wire intercoms separate power delivery and communication signals onto distinct pairs of wires. This separation can enhance communication reliability and reduce interference, as opposed to systems where power and communication signals share the same wires.

3. Basic Functionality 

Four-wire intercom systems typically support both audio and video communication, although the video quality may be less advanced compared to modern IP-based systems. These systems are commonly used in entry-level applications, offering basic functionalities such as door entry control, audio communication, and lower-resolution video.

4. Range 

Similar to two-wire systems, the communication range of four-wire intercoms is typically limited, generally extending to a few hundred meters. The actual range can vary depending on the specific system and the quality of the wiring installation.

5. Ease of Installation 

While four-wire intercoms require more complex installation due to the need to manage four separate wires, they are a suitable choice when prioritised separation of power and communication signals is desired.

6. Cost 

Four-wire intercom systems generally cost less than IP-based systems. However, due to the increased wiring requirements, they can be slightly more expensive than two-wire systems.

7. Compatibility 

Four-wire intercom systems are often compatible with existing four-wire infrastructure, such as that found in older buildings. This makes them suitable for upgrading or replacing older intercom systems that were originally designed for four-wire communication.

Here are some examples of Four Wire Intercoms from various manufacturers:

1. DS-KIS212- HIKVISION
2. KTA04 - DAHUA
3. KTA03M - DAHUA
4. KTA02 - DAHUA