About this guideThis guide provides site preparation recommendations, step-by-step procedures for rack mounting and desk mounting, inserting optionalmodules, and connecting to a power source.CAUTION: To avoid electrostatic discharge (ESD) damage, wear grounding wrist straps when handling this equipment.WARNING: Only trained and qualified personnel can install this equipment. Read this guide before you install and power up thisequipment. This equipment contains two power cords. Disconnect both power cords before servicing.WARNING: This equipment contains optical transceivers, which comply with the limits of Class 1 laser radiation.Figure 1. Class 1 laser productNOTE: When no cable is connected, visible and invisible laser radiation may be emitted from the aperture of the opticaltransceiver ports. Avoid exposure to laser radiation and do not stare into open apertures.Related documentsFor more information about the S4048–ON system, see the following documents:• Dell Networking S4048–Open Networking (ON) Getting Started Guide• Dell Networking S4048–Open Networking (ON) Release Notes• Dell Open Networking Troubleshooting GuideNOTE: For the most recent documentation, visit Dell Support: www.dell.com/support.1About this guide 5