Srx210 Services Gateway Poe Overview

Transcript

SRX210 Services Gateway PoE Overview This topic includes the following sections: ■ Introduction on page 1 ■ PoE Classes and Power Ratings on page 2 Introduction Power over Ethernet (PoE) is the implementation of the IEEE 802.3 AF and IEEE802.3 AT standards that allow both data and electric power to pass over a copper Ethernet LAN cable. The SRX210 Services Gateway supports PoE on four ports, which supply electric power over the same ports that are used to connect network devices. PoE ports allow you to plug in devices that require both network connectivity and electric power, such as VoIP and IP phones and wireless access points. You can configure the gateway to act as power sourcing equipment for devices connected on the designated ports. Table 1 lists the SRX210 Services Gateway PoE specifications. Table 1: SRX210 Services Gateway PoE Specifications Power Management Schemes Values Supported standards ■ IEEE 802.3 AF (PoE) ■ IEEE802.3 AT (PoE+) ■ Legacy (pre-standards) Supported ports The following ports support PoE: ■ ge-0/0/0 ■ ge-0/0/1 ■ fe-0/0/2 ■ fe-0/0/3 Total PoE power sourcing capacity 50 watts Per-port power limit 30 watts 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 The IEEE 802.3 AF (PoE) functionality is supported on SRX210 Services Gateway PoE models that have power supply of 48V. The IEEE802.3 AT (PoE+) functionality SRX210 Services Gateway PoE Overview ■ 1 is supported on SRX210 Services Gateway PoE models that have power supply of 54V. For more information, see Adjusting the Power Supply Adapter Tray for the SRX210 Services Gateway for Rack-Mount Installation. NOTE: ■ The PoE+ functionality is available from JUNOS Software Release 10.2 or later. ■ The PoE+ functionality is available only if your gateway is using 54V power supply. You can order the 54V power supply from Juniper Networks. Contact your Juniper Networks customer service representative for more information. 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 802.3 AF standard. Table 2: PoE Classes and Power Ratings on the SRX210 Services Gateway Related Topics 2 ■ Class Maximum Power Level Output from the PoE Port 0 15.4 watts 1 4.0 watts 2 7.0 watts 3 15.4 watts 4 30.0 watts ■ SRX210 Services Gateway Description ■ SRX210 Services Gateway Specifications ■ SRX210 Services Gateway Front Panel and Back Panel Views (Low Memory, High Memory and PoE Version) ■ SRX210 Services Gateway Built-In Interfaces ■ SRX210 Services Gateway LEDs SRX210 Services Gateway PoE Overview ■ Mini-Physical Interface Modules on the SRX210 Services Gateway ■ SRX210 Services Gateway 3G ExpressCard Overview Published: 2010-05-04 SRX210 Services Gateway PoE Overview ■ 3