POE (Power Over Ethernet) Benefits

Benefits of Power over Ethernet
Why is PoE so important to Ethernet networks? The benefits of PoE are numerous from both a network efficiency standpoint as well as a cost standpoint. Any sized organization can enjoy the benefits of integrating Power over Ethernet into their network designs. Consider some of the following benefits:

Flexible and more Efficient Network Designs
With PoE, the constraint of having AC power outlets is eliminated. This provides flexibility in placing PoE-enabled network equipment such as VoIP phones, wireless access points, and IP cameras in the most optimal locations instead of choosing locations where power is available. Optimal placement of networking devices leads to more efficient network designs and better application performance. PoE enables the easy placement of equipment on ceilings, high on walls, or in outdoor locations that may yield better network performance.

Below the power classes defined by IEEE 802.3af:
Measured current (mA)
Maximum PD power (W)
0 0 to 5 0.44 to 12.95
1 8 to 13 0.44 to 3.84
2 16 to 21 3.84 to 6.49
3 25 to 34 6.49 to 12.95
4 35 to 45 Reserved

Simplified, Faster, and Lower Cost Installations
The electrical component is greatly diminished from network installation projects. No longer are budgets and schedules impacted by the requirement of paying for and coordinating the installation of AC power outlets for networked equipment. As a result, network installations can be accomplished easier, faster, and for less cost.

Eases and Accelerates Adds, Moves, and Changes or Temporary Deployments
Network adds, moves, and changes can be accomplished faster with PoE-enabled switches and network devices. No longer will the business be impacted by delays in completing network modifications or upgrades. The network will be more flexible and accommodating to changing business and network requirements. Additionally, PoE can facilitate temporary network deployments like mobile offices, mobile classrooms, tradeshows, or meetings by eliminating the need for the installation of additional power to support networking devices.

Enables Centralized Power Management
Using a PoE infrastructure enables centralized power management capabilities for your mission critical network devices. In a power outage critical networking devices like VoIP phones and IP security cameras will become inoperable unless they are protected by an uninterruptible power supply (UPS) with battery backup. Having the networked equipment distributed throughout your building or campus requires the distribution of several UPS systems. With PoE, a single, centrally managed UPS can be used to supply backup power to your PSE equipment. All the distributed PD networking devices can then receive battery-backed power even in power outages. Centrally managed power also enables remote shutdown or remote reset capabilities. Through managing a PoE-enabled LAN switch via a web browser or by SNMP, remote networking devices can be easily reset or shut down saving the time and expense of dispatching a technician.

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