What's PoE
Power over Ethernet (PoE) technology has become the predominant solution for deploying network applications that overcome power supply restrictions, as well as for enterprises seeking to reduce time, costs, and labor with simplified, flexible network infrastructures. PoE technology allows power and data to be delivered to networked device on the same Ethernet cable. Hence, the devices can be installed wherever Ethernet cables are available, even where there are no AC power outlets. Most importantly, additional hardware upgrades are not required.
 
  PoE Standards  
 

PoE includes the IEEE 802.3af and IEEE 802.3at standards:

The majority of PoE devices employ IEEE 802.3af, which provides up to 15.4 W of DC power to each PoE-enabled device; however, only 12.95 W is actually available to powered devices (PD). This fall-off is attributed to the power dissipation of the cable. Due to this limitation, many powered devices have another connector for an optional auxiliary power supply. If used, this gives backup power to the device if the power to the Ethernet connector is inadequate or suddenly fails.

 
 

The IEEE 802.3at standard, also known as PoE+, provides up to 30 W of power and is intended to supply power to electricity guzzlers such as high performance PTZ (pan-tilt-zoom) IP security cameras. With the ever increasing demands for enhanced security, PoE+ is fast becoming not only a necessity, but also the answer for today and tomorrow.

Moxa is continuously developing and improving their line of PoE products. In addition to current PoE products, Moxa has added two new switches, the EDS-P206A and EDS-P506A, as well as the INJ-24 PoE+ PoE injector, to their PoE product lineup. Moxa offers you more choices to help you tackle the demands of high power peripherals.
 
 
     
   
 
 
What PoE injectors and splitters can do for you?

It’s extremely easy take advantage of PoE technology: simply replace all of your non-PoE devices to PoE-enabled devices… But what if you do not require a complete infrastructure conversion or are only looking for small-scale of expansions? The answer is simple: PoE injectors and splitters. With PoE injectors and splitters you can upgrade your existing infrastructure to support PoE.

Use a PoE injector to enable non-PoE switches to transmit digital data and electricity to PoE devices over an Ethernet cable. Use PoE splitters to separate data and electricity from a PoE switch into two different outputs for non-PoE devices. With Poe injectors and splitters, you need not replace all existing non-PoE devices with PoE devices to achieve PoE capability.

 
 
 
What does 24/48VDC support mean to you?

Currently, PoE devices only provide 48 V power input, making it difficult for them to be used in existing industrial automation applications where 24 VDC is the only available power source. Users must then purchase additional 48 V power adaptors to change the voltage of their PoE devices. Adding additional power adaptors translates to higher costs, installation and maintenance efforts, and the need for additional space.

Moxa offers PoE devices with 24/48 VDC power inputs; these devices automatically adjust to a suitable voltage that is consistent with the application’s requirements—eliminating unnecessary costs and efforts. These PoE devices are highly space-efficient and are perfect for cabinets, which do not allocate additional room for supplementary devices. Most significantly, dual power inputs also provide excellent redundancy capability and thus improve system reliability. When one of the power input fails, the device is able to continue working by obtaining power from the other input.

 
 
   
     
  PoE Devices  
  There are two basic categories for PoE devices; power sourcing equipment (PSE) that provides DC power and powered device (PD) that receives voltage power over an Ethernet cable. In an environment where only some devices are PoE-enabled, PoE splitters or injectors are used to create an all-inclusive PoE infrastructure that is both efficient and cost-effective. PoE technology has now been used in many devices, including:  
     
 
Traffic control systems: LED display boards
Power automation equipment: Gas detector, embedded and terminal computers, IP speakers, card readers, etc.
Critical facility surveillance: IP cameras, security access control systems, etc.
Wireless devices: Wireless PDAs, APs, base station devices, etc.
Point-of-sale devices
VoIP phones
 
   
 
 
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