About PoE Power over Ethernet | Enterasys Networks 7H4385-49

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About PoE (Power over Ethernet)

This appendix provides an overview of Power over Ethernet Technology and how it is implemented in relation to the 7H4385‐49.

Overview

Power over Ethernet (PoE) refers to the ability to provide operational power through the same Ethernet cabling to a PD (powered device) connected to a data network. Modern Ethernet implementations employ differential signals over twisted pair cables. This requires 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 7H4385‐49 is fully compliant with the IEEE 802.3af standard. It supports the standard resistor based detection method, as well as AC disconnect capability. The 7H4385‐49 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 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

DFE-Platinum Series Hardware Installation Guide C-1

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Enterasys Networks 7H4385-49 manual About PoE Power over Ethernet, Overview

Contents

Enterasys Matrix Page Page Class a ITE Notice Clase A. Aviso de ITE Product SafetyFederal Communications Commission FCC Notice Industry Canada Notice Electromagnetic Compatibility EMC Compatibilidad Electromágnetica EMCElektro- magnetische Kompatibilität EMC Supplement to Product Instructions Safety Information Class 1 Laser Transceivers Vcci NoticeBsmi EMC Statement Taiwan USA Declaration of Conformity Enterasys NETWORKS, INC. Firmware License Agreement Viii Page Page Contents Appendix C About PoE Power over Ethernet TroubleshootingAppendix a Specifications Appendix B Mode Switch Settings and Option Installations Tables Figures Xiv About This Guide Who Should Use This GuideImportant Notice How to Use This Guide Related DocumentsFor Refer to Following conventions are used in this guide Conventions Used in This Guide Support@enterasys.com Getting Help For information about Refer to Introduction Overview of DFE-Platinum Series Module Capabilities DFE-Platinum 7H4385-49 PoE Module 7H4385-49 DFE-Platinum Module Management Switch Configuration Using WebViewSwitch Configuration Using CLI Commands Connectivity Secure Networks Policy Support Lanview Diagnostic LEDs Link Aggregation Network Requirements Module Placement in a Matrix E7 Chassis FTM Bridge Function and Optional Interface Module10BASE-T Network 100BASE-TX Network 100BASE-TX Network Network Requirements Installation Installation Site Requirement Contents of 7H4385-49 Module Carton QuantityUnpacking the DFE Module Installing Optional Network Expansion Module NEM Backplane Connections and Installation RulesFTM1 and FTM2 Connectivity Module Placement and Installation Rules Matrix E7 Chassis Module PlacementExample 1 -1,A Example 2 -1,B Example 3 -1, CExample 4 -1,D Example 6 -1, F Example 5 -1, E DFE-Platinum Series Hardware Installation Guide To install the 7H4385‐49, refer to ‐2 and proceed as follows DFE-Platinum Series Hardware Installation Guide No bottom connectors in Matrix N7chassis Installing the 7H4385-49 into Matrix N1, N3, or N5 Chassis Installation Installing Module into Matrix N3, N5, or N1 Chassis N3 shown Connecting 48 Vdc Power for PoE Operation Connecting UTP Cables to 7H4385-49 Connecting to the Network Making the UTP Connections Connecting a Twisted Pair Segment with RJ45 Connector RX+ TX+ TX1+ RX1 TX2+ TX3+ RX3 RX2 TX4+ RX4 Verifying PoE Port Status Connecting to COM Port for Local Management What Is NeededConnecting to an IBM PC or Compatible Device Parameter Setting Connecting to a VT Series Terminal 10 Connecting a VT Series Terminal Connecting to a Modem 11 Connecting to a Modem COM Port Adapter Wiring and Signal Diagram RJ45 Adapter Wiring and Signal Assignments RJ45 DB25 Modem Port Adapter Wiring and Signal Diagram Completing the Installation Completing the Installation of a New SystemFirst-Time Log-In Using a Console Port Connection 12 Matrix DFE Startup Screen Example N7 Chassis Enter Logging in with an Administratively-Configured User Account Troubleshooting Using LanviewAbout the Management Mgmt LED Viewing the PoE Port Status Viewing the Receive and Transmit Activity Color State Recommended Action LED Amber and Alternating 67% on, 33% RX/TX Indications in Standard Mode RX/TX DFE-Platinum Series Configuration Guide Troubleshooting Checklist Problem Possible Cause Recommended Action Troubleshooting Checklist Overview of DFE Module Shutdown Procedure OFFLINE/RESET Switch Recommended Shutdown Procedure Using OFFLINE/RESET Switch Last Resort Shutdown Procedure Using OFFLINE/RESET Switch Processors/Memory SpecificationsDFE Module Specifications Table A-1 7H4385-49 Specifications Environmental Table A-1 7H4385-49 Specifications PhysicalTable A-2 COM Port Pin Assignments Signal Name Input/Output COM Port Pinout Assignments Table A-3 Compliance Standards Regulatory Compliance Regulatory Compliance Regulatory Compliance Specifications Required Tools Mode Switch Settings and Option Installations Setting the Mode Switches Memory Locations and Replacement Procedures Memory Locations and Replacement Procedures Gaining Access to Memory Modules Gaining Access to Memory Modules Removing the Safety Cover Figure B-3 Removing the Safety Cover Removing the Optional Network Expansion Module NEM Dram Simm Replacement Procedure Figure B-5 Removing the Existing Dram Simm Removing the Dram Simm Figure B-6 Installing the Dram Simm Installing the Dram Simm Removing the Dimm Dimm Replacement Procedure Installing the Dimm Installing the Network Expansion Module NEM Figure B-9 Installing the Network Expansion Module Reinstalling the Safety Cover Figure B-10 Installing the Safety Cover Overview About PoE Power over Ethernet Proprietary PD Detection Table C-2 PoE Status LED Indications PoE Port Status PoE Port Status LEDs Overview About PoE Power over Ethernet Numerics Index Pinout assignments console port A-2