1About this GuideThis guide provides site preparation recommendations, step-by-step procedures for rack mounting anddesk mounting, inserting optional modules, and connecting to a power source.After you have completed the hardware installation and powered up the S4820T refer to the FTOSConfiguration Guide for the S4820T System for software configuration information. For command lineinterface (CLI) information, refer to the FTOS Command Line Reference Guide for the S4820T System.NOTE: User port stacking requires Dell Networking operating system (FTOS) version 8.3.19.0NOTE: For information about upgrading the S4820T system, refer to the FTOS Release Notes for theS4820T System. If you have any questions regarding FTOS versions and system upgrades, contactDell Networking Technical Support.CAUTION: To avoid electrostatic discharge (ESD) damage, wear grounding wrist straps whenhandling this equipment.WARNING: Only trained and qualified personnel can install this equipment. Read to this guidebefore you install and power up this equipment. This equipment may contain two power cords.Disconnect both power cords before servicing.WARNING: This equipment contains optical transceivers, which comply with the limits of Class 1laser radiation.WARNING: When no cable is connected, visible and invisible laser radiation may be emitted fromthe aperture of the optical transceiver ports. Avoid exposure to laser radiation and do not stareinto open apertures.Information Symbols and WarningsThis book uses the following information symbols:NOTE: The Note icon signals important operational information.CAUTION: The Caution icon signals information about situations that could result in equipmentdamage or loss of data.WARNING: The Warning icon signals information about hardware handling that could result ininjury.WARNING: The ESD Warning icon requires that you take electrostatic precautions when handlingthe device.About this Guide 5