66 Switch Features
Power over Ethernet (PoE) Plus Features
For information about configuring PoE Plus features, see "Managing General
System Settings" on page 239."
Power Over Ethernet (PoE) Plus Configuration
The PowerConnect 7024P and 7048P switches support PoE Plus
configuration for power threshold, power priority, SNMP traps, and PoE
legacy device support. PoE can be administratively enabled or disabled on a
per-port basis. Power can also be limited on a per-port basis.
PoE Plus Support
The PowerConnect 7024P and 7048P switches implement the PoE Plus
specification (IEEE 802.3AT). 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.
Switching Features
Flow Control Support (IEEE 802.3x)
Flow control enables lower speed switches to communicate with higher speed
switches by requesting that the higher speed switch refrains from sending
packets. Transmissions are temporarily halted to prevent buffer overflows.
For information about configuring flow control, see "Configuring Port-Based
Traffic Control" on page 687.
Head of Line Blocking Prevention
Head of Line (HOL) blocking prevention prevents traffic delays and frame
loss caused by traffic competing for the same egress port resources. HOL
blocking queues packets, and the packets at the head of the queue are
forwarded before packets at the end of the queue.
NOTE: The PowerConnect 7024P and 7048P switches support PoE Plus. The PoE
Plus features do not apply to the other models in the PowerConnect 7000 Series.
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