Users Guide

Switch Feature Overview 81
Power Over Ethernet (PoE) Support
PoE switches implement the PoE specification (IEEE 802.3af) and support
configuration for power threshold, power priority, SNMP traps, and PoE
legacy device support. Power can be limited on a per-port basis.
PoE Plus Support
PoE Plus-capable switches implement the PoE Plus specification (IEEE
802.3at), in addition to the IEEE 802.3af specification. This allows power to
be supplied to Class 4 PD devices that require power greater than 15.4 Watts.
Each port is capable of delivering up to 30W of power. Real-time power
supply status is also available on the switch as part of the PoE Plus
implementation.
Per-Port Power
Prioritization
Provides the ability to assign a priority to each PoE port.
When the power budget of the PoE switch has been
exhausted, the higher-priority ports are given preference
over the lower-priority ports. Lower priority ports are
automatically stopped from supplying power in order to
provide power to higher-priority ports.
Per-Port Power Limit Configurable power limit for each PoE-Plus port.
Power Management
Modes
Supports three power-management modes:
• Static—Reserves a configurable amount of power for a PoE
port.
• Dynamic—Power is not reserved for the port at any point
of time. Power is supplied based upon the detected
powered device (PD) signature.
• Class-based—Reserves a classed-based amount of power
for a PoE port. The final power delivered is determined via
LLDP-MED negotiation, which allows for refinement of
the power limit.
Power Detection Mode Sets the mode to 802.3at or 802.3at+legacy detection.
Table 2-5. PoE Plus Key Features (Continued)
Feature Description