Green Ethernet; Head Of Line Blocking Prevention; Flow Control Support (Ieee 802.3X); Back Pressure Support - Dell PowerConnect 5548P System User's Manual

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Audio and video remote monitoring

For more information, see "Power over Ethernet" on page 162.

Green Ethernet

Green Ethernet, also known as Energy Efficient Ethernet (EEE), is an effort

to make networking equipment environmentally friendly, by reducing the

power usage of Ethernet connections.

The Short-Reach method, which reduces power over Ethernet cables shorter

than 40m, is supported by the device.

For more information, see "Green Ethernet Configuration" on page 391.

Head of Line (HOL) blocking results in traffic delays and frame loss caused

by traffic competing for the same egress port resources. To prevent HOL

blocking, the device queues packets, and packets at the head of the queue are

forwarded before packets at the end of the queue.

Flow control enables lower-speed devices to communicate with higher-speed

devices, by requesting that the higher-speed device refrain from sending

packets. Transmissions are temporarily halted to prevent buffer overflows.

For more information, see "Flow Control" on page 387.

On half-duplex links, the receiving port prevents buffer overflows by

occupying the link so that it is unavailable for additional traffic.

For more information, see "Protected Ports" on page 395.

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Dell PowerConnect 55xx Systems User Guide