Poe Plus Support; Switching Features; Flow Control Support (Ieee 802.3X); Head Of Line Blocking Prevention - Dell PowerConnect 7048P Manual

Powerconnect 7000 series stackable layer 2 and 3 switches

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Table of Contents

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.

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 (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.

Jumbo frames enable transporting data in fewer frames to ensure less

overhead, lower processing time, and fewer interrupts.

For information about configuring the port MTU, see "Configuring Port

Characteristics" on page 483.

Your switch supports auto-detection between crossed and straight-through

cables. Media-Dependent Interface (MDI) is the standard wiring for end

stations, and the standard wiring for hubs and switches is known as Media-

Dependent Interface with Crossover (MDIX).

Switch Features