POE (Power Over Ethernet) refers to the technology that provides dc Power to ip-based terminals (IP phones, wireless LAN access points, AP, network cameras, etc.) while transmitting data signals without any changes to the existing Ethernet cat.5 cabling infrastructure. Also known as POL (Power over LAN) or Active Ethernet, sometimes referred to simply as Ethernet Power, the POE is the latest standard specification for transmitting data and Power simultaneously using existing standard Ethernet cables, while maintaining compatibility with existing Ethernet systems and users.

PoE early application has no standard and adopts idle power supply.

1, the IEEE 802.3 af

IEEE 802.3af(15.4w) became the first PoE power supply standard, specifying the Ethernet power supply standard and the mainstream implementation standard for PoE applications.

IEEE began working on the standard in 1999, and the first vendors to participate were 3Com,Intel, PowerDsine,Nortel, Mitel, and National Semiconductor. However, the shortcomings of the standard have been restricting the expansion of the market. Until June 2003, the IEEE approved the 802.3af standard, which specifies power detection and control in remote systems, and how routers, switches, and hubs power IP phones, security systems, and wireless LAN access points over Ethernet cables. The development of IEEE 802.3af involves the efforts of many corporate experts, which makes the standard testable in all respects.

A typical Ethernet power supply system. Keep Ethernet switches in the distribution cabinet and use a Midspan HUB to power the LAN twisted pair. At the end of the twisted pair, the power supply is used to drive phones, wireless access points, cameras, and other devices. To avoid power outages, a UPS is an option.

2, the IEEE 802.3 at

IEEE802.3at (25.5w) was born to meet the needs of high-power terminals. On the basis of compatibility with 802.3af, IEEE802.3at (25.5w) can provide larger power supply requirements and meet new demands.

In order to follow the IEEE 802.3 af specification, the electrical equipment (PD) on PoE are restricted to 12.95 W power consumption, this for traditional IP phone and web camera is enough to meet demand, but as the dual band access, video phone, PTZ video monitoring system of high power application, 13 W power is obviously cannot meet the demand, this limits the application range of the Ethernet cable power supply. To overcome the PoE constraints on power budgets and push them into new applications, the IEEE has established a new task force to explore ways to improve the power limits of the international power standard. The IEEE802.3 research group was founded in November 2004 to evaluate the possibility of IEEE802.3at realization technically and economically. This was followed in July 2005 by the approval of a plan to establish an IEEE 802.3at commission of inquiry. The new standard, known as power-over-ethernet Plus (PoEP) IEEE 802.3at, defines devices with Power requirements higher than 12.95w as Class 4 (a level described in IEEE 802.3af but reserved for future use), extending Power levels to 25W or higher

POE system composition: a complete POE system includes PSE (Power Sourcing Equipment) and PD (Powered Device). PSE devices are the devices that power Ethernet client devices and are the administrators throughout the POE Ethernet power process. PD devices, on the other hand, are PSE payloads that receive power, i.e., POE system client devices, such as IP phones, network security cameras, AP and PDA or mobile phone chargers, and many other Ethernet devices. (in fact, any device with less than 13W power can receive power from the RJ45 socket.) Based on IEEE 802.3af standard, they establish the information connection of PD at the receiving end, device type, power consumption level and other aspects, and according to PSE, power supply to PD through Ethernet.

Most E-Lins products support non-standard POE power supply, like H685, H720, H750,H820QO.

The following is a brief introduction to the E-Lins H700 series industrial-grade 4G routers.

E-Lins H700 series 4G router, with high-end configuration, high performance, high reliability and high security, supports full network communication

Dual-core CPU main frequency is 880Mhz

Gigabit fiber level broadband access, transmission speed increased 10 times

Powerful local storage space, convenient for industrial control customer data backup

Provide more VPN security deployment solutions

Omni-directional high gain dual antenna design, support MIMO

Rich interfaces: gigabit WAN RJ45 * 1 + gigabit LAN RJ45 * 4 + 4 groups of digital input and output ports + double serial port + USB3.0 port + MicroSD card slot (TF card)

Supports 2.4ghz and 5.8ghz dual-band Wi-Fi

The built-in industrial-grade 4G module supports direct insertion of dual SIM CARDS, and supports backup of link failure, load balancing and link binding

Ultra-wide input voltage support: 5-40vdc or 5-60vdc

Dual power supply backup

Various installation methods: desktop installation, wall installation, 35mm DIN rail type installation