Cisco Systems 78-16356-01 manual Line Conditioners, Uninterruptible Power Supplies

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Chapter 5 Maintaining Your GSS

Using Power Protection Devices

Line Conditioners

Line conditioners go beyond the overvoltage protection of surge protectors. Line conditioners keep a GSS’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 GSS 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 GSS 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 Global Site Selector 4491 Hardware Installation Guide
5-8	78-16356-01

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Contents Cisco Global Site Selector 4491 Hardware Installation Guide Page Cisco Global Site Selector 4491 Hardware Installation Guide Page N T E N T S Installing the GSS Maintaining Your GSS Cabling a Modem to the GSS B-4 Figure B-1 Page Port Specifications A-3 Xii Preface Audience How to Use This Guide Chapter/Appendix DescriptionRelated Documentation Document Title ProvidesSymbols and Conventions XviiBewaar Deze Instructies Varoitus Tärkeitä TurvallisuusohjeitaWarnung Wichtige Sicherheitshinweise Avvertenza Importanti Istruzioni Sulla SicurezzaTA Vare PÅ Disse Instruksjonene Aviso Instruções Importantes DE SegurançaVarning! Viktiga Säkerhetsanvisningar Spara Dessa AnvisningarXxii Introduction IntroductionSystem Hardware Features Front Panel Features Rear Panel FeaturesFront Panel Features Front Panel ViewIndicator Color State Indicates LED IndicatorsRear Panel Features Rear Panel ViewPorts and Connectors Console PortParameters Settings Pin Signal DefinitionShell Ethernet Connectors Ethernet Port 0 Pin NumbersPreparing for Installation Safety Preparing for Installation Safety Preparing for Installation Safety Preparing for Installation Safety General Precautions Maintaining Safety with ElectricityProtecting Against Electrostatic Discharge Preparing Your Site for Installation Choosing a Site for Installation EnvironmentalEnsuring Overcurrent Protection AC PowerGrounding the GSS Creating a Safe Environment Precautions for Rack-Mounting CablingRequired Tools and Equipment Installing the GSS Unpacking and Inspecting the GSS If the Product is DamagedInstalling Your GSS Installing the GSS in a Four-PostRack Rack Rail Components Attaching the Telescopic Rails to the Rack Assembly Telescoping the Rail Attaching Front Rail to the Right Side of the Rack Telescopic Rail Adjustment Screws Attaching Back Rail to the Right Side of the Rack Inserting the GSS into the Rack Attaching a Two-Post Rack Bracket to the GSS Sliding the GSS into the Four-post RackAttaching the Right Bracket to the Right Side of the GSS Installing the GSS on a Workbench or Tabletop Connecting Cables 10 GSS Back Panel Ports and ConnectorsConnecting AC Power Booting the GSS Establishing a Serial Console Connection Checking the Front Panel LEDs 11 GSS 4491 Front Panel LEDsRemoving or Replacing a GSS Installing the GSS Removing or Replacing a GSS Installing the GSS Removing or Replacing a GSS Troubleshooting the GSS Hardware Checking the BasicsChecking Connections Troubleshooting the GSS Hardware Checking Connections Troubleshooting the GSS Hardware Checking Connections Maintaining Your GSS Maintaining Your Site EnvironmentTemperature Humidity AltitudeCorrosion Dust and ParticlesElectrostatic Discharge Electromagnetic and Radio Frequency Interference Power Source Interruptions MagnetismUsing Power Protection Devices Surge ProtectorsUninterruptible Power Supplies Line ConditionersElectrical Specifications AC Specification OperationalEnvironmental Specifications Specification Operational Non-operationalPort Specifications Physical SpecificationsDescription Specification Appendix a Specifications Port Specifications Connecting a Modem to the GSS Console Port Configuring a Modem Table B-1connector pinouts for the GSS console portTable B-1 Console Port Connector Pinouts Figure B-2 Rear Panel Ports and Connectors Cabling a Modem to the GSSParameters Default Settings 78-16356-01 D E IN-2 IN-3 IN-4 IN-5 IN-6