IEEE802.3af-2003 – Original Power over Ethernet (PoE) standard from July 2003. Allowed sending 15.4 W of DC power with voltages between 44VDC and 57VDC and a maximum ongoing current of 350mA from the Power Sourcing Equipment (PSE) to the Powered Device (PD).. Required Category 3 or better structured cabling, with worst case resistance of 20ohms over 100m. 12.95W at a voltage range of 37VDC to 57VDC are available to the powered device, with the remaining15.4W-12.95W=2.45W being potentially dissipated on the cable.
IEEE802.3at-2009 – Latest IEEE802.3 PoE standard, also known as PoE+ or PoE plus, allows delivery of up to 30W or 60W over a single Category 5 or better cable, depending on the number of pairs utilized to deliver power. IEEE802.3at-2009 powered devices can consume up to 12.95W (type 1), 25.5W (type 2) or 51W (two collocated Type 2 interfaces).
Power over HDbaseT – PoE standard, also known as PoH, allows delivery of up to 100w over a single Category 5e/6 Ethernet cable.
PoE – Power over Ethernet, nomenclature of the multiple technologirs that allow delivery of power over Category 3 or better cables along with Ethernet data. Normally refers to the IEEE802.3af-2003 and IEEE802.3at-2009 standards, but can also refer to pre-standard equipment such as Microsemi’s Power over LAN™ and Cisco’s Inline Power, EPoE or UPoE.
PD – a device powered by a PSE and thus consumes energy. Examples include wireless access points, IP Phones, and IP cameras.
Many powered devices have an auxiliary power connector for an optional, external, power supply. Depending on the PD design, some, none, or all power can be supplied from the auxiliary port, with the auxiliary port sometimes acting as backup power in case of PoE supplied power failure.
PSE – “Power Sourcing Equipment” – the device such that provides power on the Ethernet cable.
Midspan – intelligent power injectors that stand between a non-PoE Ethernet switch and the powered device, injecting power without affecting the data.
WLAN AP – “Wireless Local Area Network Access Points” are base stations for the wireless network. They transmit and receive radio frequencies for wireless enabled devices to communicate with.
IP Camera – “Internet protocol cameras” are a type of digital video camera which can send and receive data via a computer network and the Internet.
VoIP – “Voice over Internet Protocol” is a family of technologies, methodologies, communication protocols, and transmission techniques for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks.
Thin Client – a client machine that relies on the server to perform the data processing. This can be either a dedicated thin client terminal or a regular PC with thin client software is used to send keyboard and mouse input to the server and receive screen output in return.
Zero Client – a server-based computing model in which the end user’s computing device has no local storage. A zero client can be contrasted with a thin client, which retains the operating system and each device’s specific configuration settings in flash memory.
Access Control Device – often referred to as a “reader,” is a device that controls accessibility to a physical barrier where granting access can be electronically controlled.
UV – “Ultraviolet Light” This light wave can cause damaging burnt radiation, which is why Microsemi’s PD-9001GO-ET is UV protected to survive UV intensive environments.
NEMA – defines standards for various grades of electrical enclosures typically used in industrial applications. Each is rated to protect against designated environmental conditions. The PD-9001GO-ET has the NEMA 4X rating, which defines similar protection as the IP66 rating. For typical outdoor applications, where submersion is not a characteristic of installation, a NEMA 4X enclosure will be the optimal choice.