Power over Ethernet (PoE)

Part Number	Description / PDF	Quantity
POE125U-8-N PHIHONG USA	POE INJECTOR 15.4W DESKTOP	0
POE90U-1BT6-R PHIHONG USA	IEEE802.3BT - POE DESKTOP C14	122
POE16R-560L6 PHIHONG USA	POE INJECTOR WALL MOUNT 56V	236
POE16R-1AFG PHIHONG USA	POE INJECTOR 15.4W 56V WALL	210
POE14-050 PHIHONG USA	POE SPLITTER 12.5W 5V DESKTOP	366
POE15M-560E-R PHIHONG USA	PASSIVE POE ADAPTER C14 GIGABIT	7
POE370U-480-8 PHIHONG USA	POE INJECTOR 15.4W RACK	11
POE29U-1AT(PL)D-R PHIHONG USA	POE INJECTOR 30W 56V DESKTOP	0
POE45-120 PHIHONG USA	POE SPLITTER 45W 12V DESKTOP	1678
POE14-137 PHIHONG USA	POE SPLITTER 13.7W 13.7V DESKTOP	3
POE576U-8AT-N PHIHONG USA	POE INJECTOR 30W RACK	5
POE576U-8AT PHIHONG USA	POE INJECTOR 30W RACK	1
POE60U-1BT PHIHONG USA	IEEE802.3BT - POE INJECTOR DESKT	647
POEA30U-560E-R PHIHONG USA	PASSIVE POE ADAPTER C14 GIGABIT	7
POE370U-480-24-N PHIHONG USA	POE INJECTOR 15.4W RACK	4
POE80U-560(G) PHIHONG USA	POE INJECTOR 80W 56V DESKTOP	28
POE125U-8-C PHIHONG USA	POE INJECTOR 15.4W DESKTOP	2
POE125U-4-AT PHIHONG USA	POE INJECTOR 33.6W DESKTOP	0
POE576U-16AT-N PHIHONG USA	POE INJECTOR 30W RACK	20
POE60D-560(G) PHIHONG USA	POE SPLITTER 60W 50-57V DESKTOP	33

Power over Ethernet (PoE)

1. Overview

Power Supplies (PSUs) provide electrical energy to devices, categorized as external (AC adapters) or internal (mounted within devices). Power over Ethernet (PoE) integrates data and power delivery over Ethernet cables, enabling efficient power management for networked devices. PoE eliminates redundant cabling, reduces installation costs, and supports flexible device deployment in modern applications like IoT, surveillance, and smart buildings.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
PoE (IEEE 802.3af)	Up to 15.4W, legacy devices	IP phones, basic surveillance cameras
PoE+ (IEEE 802.3at)	Up to 30W, dynamic power allocation	PTZ cameras, video phones
PoE++ (IEEE 802.3bt Type 3/4)	60W (Type 3), 90W (Type 4), 4-pair power	Wireless APs, LED lighting, thin clients
UPoE (Cisco Universal PoE)	Up to 60W, proprietary protocol	Digital signage, high-power sensors

3. Structure and Components

PoE systems consist of Power Sourcing Equipment (PSE) and Powered Devices (PD). PSEs (e.g., switches, injectors) include controllers for power negotiation, isolation transformers, and protection circuits. PDs (e.g., cameras, APs) feature rectifiers, DC-DC converters, and signature detection circuits. External PSUs typically use AC-DC conversion, while internal PSUs integrate DC-DC modules.

4. Key Technical Specifications

Parameter	Importance
Power Output (W)	Determines device compatibility (e.g., 15.4W for VoIP phones)
Efficiency (80 PLUS Rating)	Reduces energy waste and operational costs
Input Voltage Range	Ensures adaptability to global power standards (100-240V AC)
Protection Features	Overcurrent, overvoltage, and short-circuit protection
Compliance Standards	IEEE 802.3af/at/bt, UL 62368-1

5. Application Fields

Enterprise networks: Wireless access points, VoIP phones
Surveillance: IP cameras, PTZ domes
Smart buildings: LED lighting control, IoT sensors
Healthcare: Medical monitoring devices, mobile carts

6. Leading Manufacturers and Products

Vendor	Representative Product
Cisco Systems	Catalyst 9200L Series PoE switches
Microchip Technology	PoE++ (90W) controllers for PDs
TP-Link	TalkTalk L2+ PoE managed switches
Dell Technologies	PowerEdge R760xa with integrated PoE+

7. Selection Recommendations

Match power output with device requirements (e.g., 90W for high-density APs)
Verify IEEE standard compatibility for interoperability
Evaluate thermal management for high-power PoE++ deployments
Consider managed PoE switches for remote monitoring and QoS control

8. Industry Trends

Future developments include higher power delivery (90W+), improved energy efficiency (80 PLUS Titanium), and integration with IoT ecosystems. Standards like IEEE 802.3bt enable multi-gigabit PoE for 5G small cells and edge computing devices. Smart PoE systems with AI-driven power allocation are emerging for dynamic load management in data centers.