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SRX220 Services Gateway PoE Overview

 

This topic includes the following sections:

Introduction

Power over Ethernet (PoE) is the implementation of the IEEE 802.3af and IEEE 802.3at standards, which allow both data and electric power to pass over a copper Ethernet LAN cable.

The SRX220 Services Gateway with Power over Ethernet (SRX220H-POE) model of the SRX220 Services Gateway supports PoE on eight ports, which supply electric power over the same ports that are used to connect network devices. The PoE ports let you plug in devices that require both network connectivity and electric power, such as IP phones and wireless access points.

You can configure the services gateway to act as power-sourcing equipment for devices connected on the designated ports.

Table 1 lists the SRX220 Services Gateway PoE specifications.

Table 1: SRX220 Services Gateway PoE Specifications

Power Management Schemes

Values

Supported standards

  • IEEE 802.3af.

  • IEEE 802.3at (PoE+).

  • Legacy (pre-standards).

Supported ports

Ports 0/0 through 0/7 (interfaces ge-0/0/0 through ge-0/0/7).

Total PoE power-sourcing capacity

120 W.

Per-port power limit

30 W.

Power management modes

  • Static: Power allocated for each interface can be configured.

  • Class: Power allocated for interfaces is decided based on the class of powered device connected.

PoE Classes and Power Ratings

A powered device is classified based on the maximum power that it draws across all input voltages and operational modes. When the class-based power management mode is configured on the services gateway, power is allocated by taking into account the maximum power ratings defined for the different classes of devices.

Table 2 lists the classes and their power ratings as specified by the IEEE 802.3af standard.

Table 2: PoE Classes and Power Ratings on the SRX220 Services Gateway

Class

Maximum Power Level Output from the PoE Port

0

15.4 W

1

4.0 W

2

7.0 W

3

15.4 W

4

30.0 W