3Com SuperStack 3 4900 SX Getting Started Manual page 37

Important Safety Information 37
WARNING: This unit operates under SELV (Safety Extra Low Voltage)
conditions according to IEC 950. The conditions are only maintained if
the equipment to which it is connected also operates under SELV
conditions.
WARNING: France and Peru only:
†
This unit cannot be powered from IT supplies. If your supplies are of IT
type, this unit must be powered by 230V (2P+T) via an isolation
transformer ratio 1:1, with the secondary connection point labelled
Neutral, connected directly to earth (ground).
†
Impédance à la terre.
WARNING: U.K. only:
If connecting a modem to the console port of the Switch 4900 SX, only
use a modem which is suitable for connection to the telecommunications
system.
WARNING: The switch should only be used in a rack if it is mounted on
runners, a shelf, or a tray to support the weight. The rack mount kits
alone are not sufficient to support the weight of the switch. The rack
mount kits must not be used to suspend the switch from under a table or
desk, or attach it to a wall.
WARNING: If you are connecting the Switch 4900 SX to a Type 3 Power
Module, read the Safety Information section in the Type 3 Power Module
User Guide.
WARNING: When an Expansion Module is not installed ensure the
blanking panel is fitted by tightening all screws with a suitable tool.
WARNING: Fiber Optic ports - Optical Safety
WARNING: Never look at the transmit laser while it is powered-up. Never
look directly at the fiber TX port and fiber cable ends when they are
powered-up.
WARNING: Use of controls or adjustments of performance or procedures
other than those specified herein may result in hazardous laser emissions.