Using Power Protection Devices | Cisco Systems 3120 guide

Chapter 5 Maintaining Your AVS 3120

Using Power Protection Devices

Using Power Protection Devices

A number of devices are available that protect against power problems such as power surges, transients, and power failures. The following subsections describe some of these devices.

Surge Protectors

Surge protectors are available in a variety of types and usually provide a level of protection commensurate with the cost of the device. Surge protectors prevent voltage spikes, such as those caused during an electrical storm, from entering an AVS 3120 through the electrical outlet. Surge protectors, however, do not offer protection against brownouts, which occur when the voltage drops more than 20 percent below the normal AC line voltage level.

Line Conditioners

Line conditioners go beyond the overvoltage protection of surge protectors. Line conditioners keep an AVS 3120’s AC power source voltage at a fairly constant level and, therefore, can handle brownouts. Because of this added protection, line conditioners cost more than surge protectors—up to several hundred dollars. However, these devices cannot protect against a complete loss of power.

Uninterruptible Power Supplies

Uninterruptible power supply (UPS) systems offer the most complete protection against variations in power because they use battery power to keep the AVS 3120 running when AC power is lost. The battery is charged by the AC power while it is available, so once AC power is lost, the battery can provide power to the AVS 3120 for a limited amount of time—from 15 minutes to an hour or so—depending on the UPS system.

Surge protectors should be used with all UPS systems, and the UPS system should be Underwriters Laboratories (UL) safety-approved.

Cisco AVS 3120 Application Velocity System Hardware Installation Guide

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Cisco Systems 3120 Using Power Protection Devices, Surge Protectors, Line Conditioners, Uninterruptible Power Supplies

Contents

Text Part Number OL-11805-01 Corporate HeadquartersPage N T E N T S Removing or Replacing an AVS 3120 Altitude OL-11805-01 Audience Preface Chapter/Appendix Description OrganizationRelated Documentation Bewaar Deze Instructies Conventions Avvertenza Importanti Istruzioni Sulla Sicurezza Warnung Wichtige Sicherheitshinweise Guarde Estas Instruções Aviso Instruções Importantes DE Segurança GEM Disse Anvisninger Xiii Product Documentation DVD Obtaining DocumentationCisco.com Ordering Documentation Documentation FeedbackCisco Product Security Overview Product Alerts and Field Notices Reporting Security Problems in Cisco Products Cisco Technical Support & Documentation Website Obtaining Technical Assistance Obtaining Additional Publications and Information Submitting a Service RequestDefinitions of Service Request Severity Xix OL-11805-01 Introduction Product Overview Front Panel Features System Hardware Features Rear Panel Features Ports and Connectors Indicator Color Description Ethernet Connectors RJ-45 Cables Console Port Pin Signal DefinitionParameter Setting RJ-45 to DB-9 or DB-25 Adapter Signal RJ-45 Pin DB-9 /DB-25 Pin OL-11805-01 Safety Preparing for Installation Preparing for Installation Safety Page Maintaining Safety with Electricity General Precautions Protecting Against Electrostatic Discharge Copper foil Preparing Your Site for Installation Grounding the AVS Choosing a Site for InstallationEnvironmental Requirements Ensuring Overcurrent Protection Cabling AC Power RequirementsPower Supply Guidelines Creating a Safe Environment Precautions for Rack-Mounting Required Tools and Equipment Installing the AVS If the Product is Damaged Installing Your AVSUnpacking and Inspecting the AVS Attaching a Two-Post Rack Bracket to the AVS Attaching the Brackets to the Sides of the AVS Installing the AVS 3120 in a Two-Post Rack Installing the AVS 3120 on a Workbench or Tabletop Connecting Cables Console Connection Connecting AC Power Booting with a Console Connected Booting the AVS Establishing a Serial Console Connection Velocityshow interface Configuring Network Settings You can view the DNS settings by using the show dns command Setting the Time Checking the Front Panel LEDs Indicator Color State Indicates Removing or Replacing an AVS Checking the Basics Troubleshooting the AVS 3120 Hardware Checking Connections Maintaining Your Site Environment Maintaining Your AVS Altitude TemperatureHumidity Electromagnetic and Radio Frequency Interference Dust and ParticlesCorrosion Electrostatic Discharge Power Source Interruptions Line Conditioners Using Power Protection DevicesUninterruptible Power Supplies Surge Protectors OL-11805-01 Environment SpecificationsDimensions and Weight Power OL-11085-01 Apache License Open Source License Files Appendix B Open Source License Files Apache License END of Terms and Conditions OL-11805-01 D E IN-2 IN-3 IN-4