PoE planning and implementation guide hp procurve www.hp.
HP ProCurve PoE Planning and Implementation Guide
© Copyright 2003 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice. This document contains proprietary information, which is protected by copyright. No part of this document may be photocopied, reproduced, or translation into another language without the prior written consent of Hewlett-Packard.
Contents 1 Introduction Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Power Through the Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 PoE Capabilities of the Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2 Operating Rules HP 600 RPS/EPS Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 Redundant Switch Power . . . . . . . . . . .
HP ProCurve Switch xl PoE Module Configurations . . . . . . . . . . . . . . 3-8 With an HP 600 RPS/EPS Powering One Module . . . . . . . . . . . . . . 3-8 With an HP 600 RPS/EPS Powering Two Modules . . . . . . . . . . . . 3-9 Infrastructure Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Introduction Overview Power over Ethernet technology allows IP telephones, wireless LAN Access Points and other appliances to receive power as well as data over existing LAN cabling, without needing to modify the existing Ethernet infrastructure. IEEE 802.3af is an extension to the existing Ethernet standards. Power Over Ethernet is likely to become a standard feature of ethernet switches in a few years, as the cost of adding power supplies to the Ethernet switches is going to be small.
Introduction Overview Introduction Power Over Ethernet connections to embedded computers will allow much cheaper installation (no AC cabling, lower labor costs), facilitate updating the installation and repositioning of sensors without electricians, while main taining full control over every node through the Internet, with VoIP and webcam telephony. Functionality can be changed by downloading new software through the network. Figure 1 shows a typical system implemented to power telephones.
Introduction Overview Power Through the Cable ■ The spare pairs are used. The pair on pins 4 and 5 are connected together and form the positive supply, and the pair on pins 7 and 8 are connected and form the negative supply. ■ The data pairs are used. Since Ethernet pairs are transformer coupled at each end, it is possible to apply DC power to the center tap of the isolation transformer without upsetting the data transfer.
Introduction Overview Introduction The HP ProCurve Switch xl PoE Module (J8161A) is a module for the HP ProCurve 5300 xl Switch and has 24 auto-sensing 10/100-TX RJ-45 ports. All 24 ports are capable of supplying PoE power. However, for the module itself to be able to supply PoE power it first must be connected to an EPS port on an HP ProCurve 600 Redundant and External Power Supply (J8168A), hereafter referred to as the HP 600 RPS/EPS.
2 This chapter discusses the operating rules and characteristics of PoE and describes the capabilities of a device used to provide redundant and external PoE power, the HP ProCurve 600 Redundant and External Power Supply (J8168A), hereafter referred to as the HP 600 RPS/EPS. The HP 600 RPS/EPS is an accessory product for the Switch 2600-PWR Series devices, the HP ProCurve Switch xl PoE Module, and specific other HP ProCurve switches.
Operating Rules External Switch Power Operating Characteristics. Operating Rules The HP 600 RPS/EPS has six RPS ports, each of which can provide redundant +12V power to a connected switch, but only one port can provide this power at a given time. If a switch with no AC power is connected to an operating HP 600 RPS/EPS, it will receive power if power is available (no higher priority port is already using the RPS power).
Operating Rules External Switch Power Maximum PoE Power Table 2-1. Maximum Power Allocations PoE Power Sources PoE for Switch 2626-PWR PoE for Switch 2650-PWR HP ProCurve Switch xl PoE Module Internal Only 406 watts available to ports 1-24. 406 watts available to ports 1-48. No internal PoE power. Internal and EPS redundant 368/184* watts available to ports 1-24. Only if the internal power supply fails. 406 watts available to ports 1-24 (provided by the internal source).
Operating Rules External Switch Power Operating Rules The Switch 2626-PWR has 24 ports and its internal PoE power supply provides 406 watts across all 24 ports. If an HP 600 RPS/EPS device is connected to the Switch 2626-PWR for the purpose of supplying external power to the PoE portion of the switch, there will be either 368 watts or 184 watts of power available should the switch’s internal PoE power supply fail.
Operating Rules External Switch Power Switch Priority Class ■ Low - Default. This priority class receives power only if all other priority classes are receiving power. If there is enough power to provision PDs on only some of the ports with a low priority, then power is allocated to the ports in ascending order, beginning with the lowest-numbered port in the class until all available power is in use.
Operating Rules External Switch Power Operating Rules Table 2-2. Power Usage Class Usage Minimum Power Levels at Output of PSE Range of Maximum Power required by the PD 0 Default 15.4 Watts 0.44 to 12.95 Watts 1 Optional 4.0 Watts 0.44 to 3.84 Watts 2 Optional 7.0 Watts 3.84 to 6.49 Watts 3 Optional 15.4 Watts 6.49 to 12.95 Watts As you can see in the table, any 802.3af compliant PD will never require more than 12.95 watts. The switch provides a minimum of 15.
3 Planning ■ What devices will need PoE power? ■ How much power will each device require? ■ What if power is lost to the switch? • Power for the switch to operate (AC power) • Power for PoE devices ■ Which devices to plug into which ports and with what priorities? ■ Are the appliances to be powered by PoE power supported? PD Power Requirements When a PD is initially connected to a PoE port, a minimum of 15.4 watts of available power is required to begin the power-up sequence. This 15.
Planning Supported Products Supported Products Planning The HP ProCurve Switch 2600-PWR Series devices and the HP ProCurve Switch xl PoE Module support any products that meet the IEEE 802.3af PoE standard. Number of PDs per Switch The number of PDs supported per switch depends on the power allocation and how much power each PD uses and how much power is left. The following examples show the power consumption in some typical configurations.
Planning Planning Your PoE Configuration HP ProCurve 2626-PWR Configurations With an HP 600 RPS/EPS Powering One Switch Source of Power Watts Available Internal PoE Power Supply 406 External PoE Power Supply (Failed Internal PoE Power Supply) 368 ■ # of Ports Powered and Average Watts/Port Redundant # of Ports Powered and Average Watts/ Port 24 @ average 15.4 W each 24 @ average 15.
Planning Planning Your PoE Configuration With an HP 600 RPS/EPS Powering Two Switches Planning Second PoE Switch/Module Source of Power 3-4 Watts Available Internal PoE Power Supply 406 External PoE Power Supply (Failed Internal PoE Power Supply) 184 # of Ports Powered and Average Watts/Port Redundant # of Ports Powered and Average Watts/ Port 24 @ average 15.4 W each 24 @ 7.6 W each 12 @ 15.
Planning Planning Your PoE Configuration HP ProCurve 2650-PWR Configurations In the following examples using the HP ProCurve 2650-PWR switch, reference is made to two blocks of ports: ports 1-24 and ports 25-48. This applies when external PoE power is available from an HP 600 RPS/EPS unit. In that case, the internal switch PoE power supply provides 406 watts of power to ports 1-24 and the HP 600 RPS/EPS provides 368 watts of power to ports 25-48.
Planning Planning Your PoE Configuration Planning With an HP 600 RPS/EPS Powering One Switch Source of Power Internal PoE Power Supply Watts Available 406 ■ 3-6 Redundant # of Ports Powered and Average Watts/ Port 24 @ average 15.4 W each 48 @ average 8.45 W each Internal plus 406 + 368 External PoE 1 - 24 25 - 48 Power Supply External PoE Power Supply (Failed Internal PoE Power Supply) # of Ports Powered and Average Watts/Port 368 (38 W is reserved for either 1-24 or 25-48) 48 @ average 15.
Planning Planning Your PoE Configuration With an HP 600 RPS/EPS Powering Two Switches Planning Second PoE Switch/Module Source of Power Internal PoE Power Supply Watts Available 406 # of Ports Powered and Average Watts/Port Redundant # of Ports Powered and Average Watts/ Port 24 @ average 15.4 W each 48 @ average 8.45 W each Internal plus 406 + 184 External PoE 1 - 24 25 - 48 Power Supply 24 @ average 15.4 W each and 24 @ 7.6 W each or 36 @ average 15.
Planning Planning Your PoE Configuration HP ProCurve Switch xl PoE Module Configurations Planning For the HP ProCurve Switch xl PoE Module to function it must be installed in an HP ProCurve Switch 5300xl. The module will receive it’s operational power from the switch and it’s PoE power from the HP 600 RPS/EPS.
Planning Planning Your PoE Configuration With an HP 600 RPS/EPS Powering Two Modules ��� �������� ��� ��� ��� ������ Source of Power External PoE Power Supply Watts Available 184/each module ��� ����� ���� �������� ��� ��� ��� ������ # of Ports Powered and Average Watts/Port 24 @ average 7.
Planning Infrastructure Requirements Infrastructure Requirements Planning Air conditioning. Power supplies create a great amount of heat. Ensure you have enough cool air to maintain an ambient temperature between 0°C to 55°C (32°F to 131°F) around the switch devices inside the rack. Power requirements.Ensure you have enough power supplied to the area where the switches will be mounted.
Glossary Glossary active PoE port - PoE-enabled port connected to a PD request power. priority class - Refers to the type of power prioritization where the switch uses Low (the default), High, and Critical priority assignments to determine which groups of ports will receive power. Note that power priority rules apply only if PoE provisioning on the switch becomes oversubscribed. EPS - External Power Supply PD - Powered Device. This is an IEEE 802.
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Index C cable power through … 1-3 class method priority … 2-4 E EPS allocation … 2-2 EPS power … 1-4 example configurations … 3-2 H HP 600 RPS/EPS external power supply … 2-2 operation … 2-1 redundant power characteristics … 2-2 redundant power supply … 2-1 HP ProCurve Switch xl PoE Module … 1-4–2-2 I Introduction … 1-1 PoE … 1-1 PoE capabilities product capabilities … 1-3 PoE power with and without EPS … 2-3 PoE power, maximum … 2-3 port priority … 2-4 power loss … 2-5 power over Et
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Technical information in this document is subject to change without notice. ©Copyright 2003 Hewlett-Packard Development Company, L.P. Reproduction, adaptation, or translation without prior written permission is prohibited except as allowed under the copyright laws.
