As the demand for upgrading analog intercoms to digital/IP systems grows, 2-wire technology has become the "go-to" solution. However, many installers encounter signal loss or unstable operation. Why? It often comes down to the wiring logic between PLC and PHY-based models.

The Core Difference (Based on Industry Practice)

PLC is more stable and higher price. It uses signal transmission over a shared 2-wire bus, allowing multiple devices to communicate through protocol-based data handling.

If you choose the correct wires, PHY is better choice. PHY relies on physical wiring quality and signal integrity for direct transmission between devices.

The Core Wiring Rules (Based on Industry Standards)

2-Core Ordinary Cables: Ideal for single families. For multi-family setups, each monitor MUST have a separate cable to avoid signal crosstalk.

CAT5/CAT6 Network Cables: The secret is in the "Twist". You must use one pre-twisted pair for each monitor. Randomly combining wires will destroy signal integrity.

Shielded vs. Unshielded: While shielding helps with EMI, distance is the trade-off. Ensure your cable gauge (mm²) matches the transmission distance.

Conclusion

In PHY-mode systems, signal interference between monitors is the #1 cause of "offline" issues. Follow the separate-path rule to ensure a 100% stable installation.

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