Enterasys Networks 4H4285-49, 6H308-48, 9033989-06 manual About PoE Power over Ethernet, Overview

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C

About PoE (Power over Ethernet)

This appendix provides an overview of Power over Ethernet Technology and how it is implemented in relation to the 4H4285‐49.

Overview

Power over Ethernet (PoE) refers to the ability to provide operational power to a device connected to a data network using the same cabling that provides the data interface. Modern Ethernet implementations employ differential signals over twisted pair cables. This requires at a minimum of two twisted pairs for a single physical link. Both ends of the cable are isolated with transformers blocking any DC or common mode voltage on the signal pair. PoE exploits this fact by using two twisted pairs as the two conductors to supply a direct current. One pair carries the power supply current and the other pair provides a path for the return current. While several proprietary legacy implementations of PoE have been deployed by LAN equipment vendors, in 2003 the IEEE published the IEEE 802.3af‐2003 specification, which is part of the 802.3 suite of standards.

The 4H4285‐49 is fully compliant with the IEEE 802.3af standard. It supports the standard resistor based detection method, as well as AC disconnect capability. The 4H4285‐49 is also capable of supplying the maximum specified current to all ports simultaneously.

Each PD has a PDC (Powered Device Classification) that is transmitted to the DFE module for power management purposes. Table C‐1 on page C‐1 lists the classifications and the associated power ranges.

Table C-1 Powered Device Classifications

Class	Usage	PD Maximum Power Range Usage

0	Default	0.44 to 12.95 Watts

1	Optional	0.44 to 3.84 Watts

2	Optional	3.84 to 6.49 Watts

3	Optional	6.49 to 12.95 Watts

4	Not Allowed	Reserved for Future Use

Matrix DFE-Gold Series PoE Module Hardware Installation Guide C-1

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Contents Enterasys Matrix Page Page Regulatory Compliance Information Electromagnetic Compatibility EMC Supplement to Product Instructions Vcci Notice Safety Information Class 1 Laser Transceivers Enterasys NETWORKS, INC. Firmware License Agreement Viii Page Page Contents Appendix a Specifications TroubleshootingAppendix B Mode Switch Settings and Option Installations Appendix C About PoE Power over EthernetTables FiguresXiv Who Should Use This Guide About This GuideImportant Notice Related Documents How to Use This GuideFor Refer to Following conventions are used in this guide Conventions Used in This GuideGetting Help For information about Refer to IntroductionDFE-Gold Module Overview of DFE-Gold PoE Module Capabilities4H4285-49 DFE-Gold Module 4H4285-49 DFE-Gold Module Switch Configuration Using CLI Commands Switch Configuration Using WebViewConnectivity ManagementStandards Compatibility Lanview Diagnostic LEDsLink Aggregation Network Requirements100BASE-TX Network 10BASE-T NetworkInstallation Contents of DFE Module Carton Quantity Installation Site RequirementUnpacking the DFE Module DFE Module Placement and Installation Rules Installing Optional Network Expansion Module NEMExample 1 -1, a Example 3 -1, C Preparing to Install the 4H4285-49 Installing 4H4285-49 into a Matrix E7 or N7 Chassis Preparing to Install the 4H4285-49 Card guides Installing 4H4285-49 into Matrix N3 or N5 Chassis Card guides Connecting 48 Vdc Power for PoE Operation Connecting UTP Cables to 4H4285-49 Connecting to the NetworkMaking the UTP Connections Connecting a Twisted Pair Segment with RJ45 Connector RX+ TX+ RX+ Verifying PoE Port Status What Is Needed Connecting to COM Port for Local ManagementConnecting to an IBM PC or Compatible Device Parameter Setting Connecting to a VT Series Terminal10 Connecting a VT Series Terminal Connecting to a Modem 11 Connecting Using a Modem COM Port Adapter Wiring and Signal Diagram RJ45 Adapter Wiring and Signal AssignmentsVT Series Port Adapter Wiring and Signal Diagram RJ45 DB25Completing the Installation of a New System Completing the InstallationModem Port Adapter Wiring and Signal Diagram RJ45 DB25 First-Time Log-In Using a Console Port Connection 12 Matrix Defogged Startup Screen Example N7 Chassis Enter Logging in with an Administratively-Configured User AccountCompleting the Installation Using Lanview TroubleshootingAbout the Management Mgmt LED Lanview LEDs Viewing Receive/Transmit ActivityColor State Recommended Action Viewing the PoE Port StatusAlternately 67% on, 33% LED RX/TX Refer to the Matrix DFE-Gold Series Configuration Troubleshooting ChecklistMatrix DFE-Gold Series Configuration Guide for OFFLINE/RESET Switch Overview of DFE Module Shutdown ProcedureLast Resort Shutdown Procedure Using OFFLINE/RESET Switch Recommended Shutdown Procedure Using OFFLINE/RESET Switch4H4285-49 Specifications SpecificationsTable A-1 4H4285-49 Specifications Processors/Memory Table A-1 4H4285-49 Specifications ItemSpecificationCOM Port Pinout Assignments Table A-2 COM Port Pin Assignments Signal Name Input/OutputRegulatory Compliance Table A-3 Compliance Standards Regulatory ComplianceRegulatory Compliance Specifications Required Tools Mode Switch Settings and Option InstallationsSetting the Mode Switches Memory Locations and Replacement Procedures Memory Locations and Replacement ProceduresGaining Access to Memory Modules Gaining Access to Memory ModulesRemoving the Safety Cover Figure B-3 Removing the Safety Cover Removing the Network Expansion Module NEM Dram Simm Replacement ProcedureFigure B-5 Removing the Existing Dram Simm Removing the Dram SimmFigure B-6 Installing the Dram Simm Installing the Dram SimmRemoving the Dimm Dimm Replacement ProcedureFigure B-8 Installing the Dimm Installing the DimmFigure B-9 Installing the Network Expansion Module Reinstalling the Optional Network Expansion ModuleReinstalling the Safety Cover Figure B-10 Installing the Safety Cover Overview About PoE Power over EthernetProprietary PD Detection Power InterfaceMatrix N5 Backplane 48 Vdc Interface Front Panel 48 Vdc InterfaceTable C-2 PoE Status LED Indications PoE Port Status PoE Port Status LEDsPoE Port Status LEDs About PoE Power over Ethernet Numerics IndexPinout assignments console port A-3

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