I. First, understand: What is the PoE function of an MDU ONU switch?
PoE (Power over Ethernet) means that the MDU ONU switch transmits data and power simultaneously through a network cable, eliminating the need for separate power cables for terminal devices (such as cameras and access points). It complies with IEEE 802.3af (maximum 15.4W per port) or 802.3at (maximum 30W per port, also known as PoE+) standards.
Its core value is: adding "centralized power supply" capability to the MDU ONU's "optical signal conversion + data forwarding," simplifying the cabling and power supply logic for multi-device networks.
II. Is PoE Functionality Necessary? Consider these 3 key factors:
PoE is not a "must-have" option; it should be considered in conjunction with the terminal type, cabling environment, and cost budget:
1. Three situations where PoE is essential:
• Terminals without independent power interfaces/Power supply difficulties: If you need to connect terminals without built-in power supplies, such as IP cameras, wireless APs (Wi-Fi 6), or IP phones, and the installation location (e.g., ceiling, wall, outdoor) makes it difficult to run power cables (e.g., hotel corridors, park fences), PoE is the only low-cost solution.
• Seeking simplified cabling and improved maintenance efficiency: Traditional networking requires two lines: a network cable (for data transmission) and a power cable (for power supply). A PoE-enabled MDU ONU can reduce cabling by 50%, and there's no need to re-run power supplies when relocating or adding devices, reducing maintenance costs by 30%+.
• Centralized power management required: If you need to remotely control terminal power (e.g., camera power failure restart, AP scheduled power on/off), a PoE MDU ONU is the ideal choice. Power supply status can be centrally managed through a management platform, avoiding on-site operations (e.g., no need to send personnel to the site for a late-night fault in the park).
2. Three situations where PoE is unnecessary:
• Terminals with their own independent power supply: Devices such as PCs, printers, and routers with built-in power adapters are only connected, requiring no additional power (these devices can be used simply by plugging in, leaving the PoE function idle and increasing unnecessary costs);
• Budget is extremely sensitive and there are few terminals: MDU ONUs with PoE are 20%-40% more expensive than non-PoE models with the same port. If there are only 3-5 terminals (e.g., small homes, shops with fewer than 10 people), buying separate power adapters (costing 10-20 yuan each) is more cost-effective than choosing PoE;
• Terminal power exceeds the PoE limit: High-power devices such as PTZ cameras (power > 30W) and small servers need to be connected, where PoE power is insufficient (even PoE+ only provides 30W), requiring an independent power supply.
III. PoE-enabled MDU ONU Switches: 5 Core Application Scenarios
1. Campus/Residential Community Security Monitoring Network
• Scenario Requirements: 8-24 IP cameras need to be deployed on campus perimeter walls or in residential building units. The devices are dispersed and often located in areas without power outlets (such as corners or green areas);
• PoE Advantages:
◦ A single 24-port PoE MDU ONU can simultaneously connect to 24 cameras (according to the 802.3af standard, a single camera power of 5-12W is fully met), eliminating the need for power cables for each camera;
◦ Uplink connects to the OLT via optical ports, and downlink directly powers and transmits data to the cameras, eliminating the need for a secondary network of "non-PoE MDU ONU + PoE switch," reducing equipment costs by 25%.
2. Hotel Guest Room Network Coverage
• Scenario Requirements: Each guest room needs to be connected to a wireless AP (Wi-Fi coverage) and an IPTV set-top box. Some hotels also require surveillance cameras in the corridors. Equipment is distributed in the guest room ceilings and corridor suspended ceilings.
• PoE Advantages:
◦ A 16-port PoE MDU ONU covers 12 guest rooms on one floor (4 ports are spare). The APs and set-top boxes are powered via network cables, avoiding the need for power wiring in the suspended ceilings (reducing fire hazards);
◦ Supports remote AP restart (no on-site troubleshooting is required when guests report Wi-Fi malfunctions), improving maintenance efficiency by 60%. 3. Small Business/Office Building Networking
• Scenario Requirements: Office space for 20-50 people, requiring access to PCs, printers, 2-3 wireless APs (covering the office area), and 1-2 front desk monitoring systems. Neat cabling is required.
• PoE Advantages:
◦ An 8-port PoE MDU ONU (4 PoE ports + 4 regular ports) meets the requirements: PoE ports connect to APs and monitoring systems, while regular ports connect to PCs and printers. Only network cables are needed for cabling, eliminating cluttered power cords on the desktop.
◦ Integrated optical modem functionality, directly connecting to the carrier's OLT. No need to purchase a separate optical modem; the network hierarchy is simplified from "optical modem + switch + PoE module" to a single device.
4. Smart Networking for Shops/Convenience Stores
• Scenario Requirements: Chain convenience stores need to connect to POS machines, security cameras, barcode scanners, and small access points (APs) for customer Wi-Fi. Store areas are small (20-50㎡), and there are no dedicated maintenance personnel.
• PoE Advantages:
◦ 4-port PoE MDU ONU (2 PoE ports for cameras and APs, 2 standard ports for POS machines and barcode scanners), plug and play, no need for professional power cabling;
◦ Low cost, 100-200 RMB cheaper than "non-PoE MDU ONU + PoE module", suitable for bulk purchases by chain brands.
5. Outdoor Scenarios (Advertising Screens / Smart Streetlights)
• Scenario Requirements: Deploying small-scale outdoor advertising screens and smart streetlights (with monitoring functions) at park entrances and commercial streets poses a risk of electrical leakage and is difficult to install.
• PoE Advantages:
◦ Using a PoE+ (802.3at) type MDU ONU, a single port's 30W power output can meet the power supply needs of outdoor advertising screens (15-25W) and smart streetlight monitoring (8-12W);
◦ Network cables offer strong anti-interference capabilities, suitable for complex outdoor environments (such as rain and low temperatures), and eliminate the need for separate power protection (such as waterproof distribution boxes), reducing construction costs by 40%.
IV. Selection Recommendations: Two Key Aspects for Choosing the Right PoE MDU ONU
1. Select PoE Standard Based on Terminal Power:
◦ Low-power terminals (ordinary IP cameras, entry-level APs) → Select 802.3af (15.4W);
◦ High-power terminals (Wi-Fi 6 APs, PTZ cameras, outdoor advertising screens) → Select 802.3at (PoE+, 30W);
2. Select PoE Port Count Based on Terminal Number:
◦ 10 or fewer terminals (small shops, small offices) → 4/8-port PoE MDU ONU;
◦ 10-30 terminals (park monitoring, hotel ground floor) → 16/24-port PoE MDU ONU.
Post time: Nov-08-2025
