48V PASSIVE POE ADAPTER

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David Tremblay; Lennart Yseboodt (November 10, 2017), "Clarifying misperceptions about Power over Ethernet and cable losses", Cabling Installation and Maintenance, archived from the original on 2018-07-22 , retrieved 2018-07-21 Outdoor point to point microwave and millimeter wave radios and some Free Space Optics (FSO) units usually featuring proprietary PoE

Power over Ethernet Interface Controllers". Archived from the original on 2016-07-20 . Retrieved 2016-07-27. Flexible to network expansion: PoE injectors add PoE capability to non-PoE Ethernet switches, which extends the network connection distance and provides combined power and data over Ethernet cable to end devices for a better connection. There are two types of PSEs: endspans and midspans. Endspans (commonly called PoE switches) are Ethernet switches that include the power over Ethernet transmission circuitry. Midspans are power injectors that stand between a regular Ethernet switch and the powered device, injecting power without affecting the data. Endspans are normally used on new installations or when the switch has to be replaced for other reasons (such as moving from 10/100Mbit/s to 1Gbit/s), which makes it convenient to add the PoE capability. Midspans are used when there is no desire to replace and configure a new Ethernet switch, and only PoE needs to be added to the network. The IEEE 802.3at-2009 [6] PoE standard, also known as PoE+ or PoEplus, provides up to 25.5W of power for Type2 devices. [7] The 2009 standard prohibits a powered device from using all four pairs for power. [8] Both of these standards have since been incorporated into the IEEE 802.3-2012 publication. [9] provides power using all four pairs of a twisted-pair cable. This enables higher power for applications like pan–tilt–zoom cameras (PTZ), high-performance WAPs, or even charging laptop batteries.A: PoE injectors are based upon the rules defined by the IEEE 802.3 standards. Normally, Ethernet cables like Cat5, Cat5e, Cat6, etc. are all available to connect between the injector and the PoE devices/network switches. Power sourcing equipment (PSE) are devices that provide ( source) power on the Ethernet cable. This device may be a network switch, commonly called an endspan (IEEE 802.3af refers to it as endpoint), or an intermediary device between a non-PoE-capable switch and a PoE device, an external PoE injector, called a midspan device. [19] Powered device [ edit ] IEEE 802.3at capable devices are also referred to as Type 2. An 802.3at PSE may also use LLDP communication to signal 802.3at capability. [38] Power levels available [39] [40] Class PoE Splitters that output the power, often at a different voltage (e.g. 5V), to power a remote device or charge a mobile phone Alternative A transports power on the same wires as data for 10 and 100Mbit/s Ethernet variants. This is similar to the phantom power technique commonly used for powering condenser microphones. Power is transmitted on the data conductors by applying a common voltage to each pair. Because twisted-pair Ethernet uses differential signaling, this does not interfere with data transmission. The common-mode voltage is easily extracted using the center tap of the standard Ethernet pulse transformer. For Gigabit Ethernet and faster, both alternatives A and B transport power on wire pairs also used for data since all four pairs are used for data transmission at these speeds.

Flexible network expansion: PoE injectors add PoE capability to non-PoE switches, thus extending the network distance. Also, the use of Ethernet cabling allows for better end device connections. A: IEEE 802.3af/at/bt compliant PoE injectors won't damage any equipment even if the equipment is not designed for PoE applications. The injector initiates a handshake procedure before it sends any power to the connected PD. That procedure utilizes low voltage and is harmless to any connected device, PoE, or non-PoE. Once the handshake is completed, the PoE injector begins sending power and triggers the connected device to start up. Should that handshake not complete successfully for any reason, the PoE injector will never send any power. It is this built-in feature of all IEEE 802.3af/at/bt-compliant devices that makes the technology so inherently safe. Amendment 3: Data Terminal Equipment (DTE) Power via the Media Dependent Interface (MDI) Enhancements, September 11, 2009Devices needing 5volts cannot typically use PoE at 5V on Ethernet cable beyond short distances (about 15 feet (4.6m)) as the voltage drop of the cable becomes too significant, so a 24V or 48V to 5V DC-DC converter is required at the remote end. [53] [ unreliable source?] Link Layer Discovery Protocol (LLDP) is a layer-2 Ethernet protocol for managing devices. LLDP allows an exchange of information between a PSE and a PD. This information is formatted in type–length–value (TLV) format. PoE standards define TLV structures used by PSEs and PDs to signal and negotiate available power.