**Introduction:**

In the realm of security surveillance cameras, the power supply mode plays a critical role in ensuring efficient and reliable operation. OHWOAI, a renowned name in security solutions, sheds light on the three primary power supply methods: Independent Mode, Centralized Mode, and Power over Ethernet (PoE) Mode. Understanding these modes' characteristics and shortcomings is crucial for making informed decisions in selecting the most suitable power supply method.

**I. Independent Power Supply Mode:**

**Advantages:**

1. **Simple Maintenance and Replacement:** Each camera has its independent power supply in this mode. When a camera experiences a malfunction, it can be quickly isolated for troubleshooting. If the issue lies with the power supply, only the faulty unit needs to be repaired or replaced.

2. **Preventing System Paralysis:** Unlike centralized power supply, where a failure can lead to a complete system shutdown, independent power supply mode ensures that only individual cameras are affected, preventing a system-wide paralysis.

**Disadvantages:**

1. **Higher Costs:** The cumulative cost of multiple independent power supplies can be higher compared to a centralized power supply for the same total power output.

2. **Susceptibility to Environmental Factors:** Cameras with individual power supplies, especially those installed outdoors, are more vulnerable to weather-related damage like exposure to sunlight, rain, and lightning.

**II. Centralized Power Supply Mode:**

**Advantages:**

1. **Cost-Effectiveness:** Although centralized power supply mode requires more cabling, its cost-effectiveness stems from the use of centralized power sources.

2. **Simplified Maintenance:** Centralized power supply simplifies cabling and management, making maintenance more straightforward.

3. **Lower Overall Power Consumption:** Centralized power supply systems generally exhibit lower energy consumption compared to independent power supply systems.

**Disadvantages:**

1. **Initial Configuration Complexity:** Centralized power supply requires an understanding of the entire surveillance system, as the power demand during camera startup isn't a simple sum of individual camera power requirements.

2. **Risk of System Failure:** Without an Uninterruptible Power Supply (UPS), a problem in the centralized power supply can lead to a system-wide failure.

**III. Power over Ethernet (PoE) Mode:**

PoE can be implemented in various ways:

1. **Both Switch and Terminal Support PoE:** This method involves directly connecting PoE switches to devices that support PoE. Ensuring that both the switch and devices are PoE-compatible and using high-quality Ethernet cables is crucial.

2. **Switch Supports PoE, Terminal Doesn't:** PoE switches connect to PoE splitters, which separate data and power. This method is useful for devices that don't natively support PoE.

3. **Switch Doesn't Support PoE, Terminal Supports PoE:** PoE injectors connect to devices that support PoE, providing power through Ethernet cables.

4. **Neither Switch nor Terminal Supports PoE:** A combination of PoE injectors and splitters can retrofit traditional networks for PoE capability.

**Choosing Between Independent and Centralized Power Supply:**

The decision between independent and centralized power supply modes depends on the installation environment and customer requirements. Generally:

- For systems up to 4 cameras, independent supply works well.

- 4 to 16 cameras with similar distances between them suit centralized supply.

- Systems with more than 16 cameras can use a combination of centralized supply, provided thorough configuration is done.

**Conclusion:**

OHWOAI's expertise in security solutions offers a comprehensive overview of power supply modes for surveillance cameras. Whether it's the **16-port switch gigabit PoE** or advanced **PoE gigabit switch 8 port**, their solutions align with each mode's pros and cons. Making the right choice among independent, centralized, or PoE power supply modes depends on the specific installation scenario, ensuring optimal performance, reliability, and cost-effectiveness.