3Com 3CR17251-91 - Switch 5500G-EI Stackable Gigabit Ethernet Getting Started Manual page 104

104 A A: S I
PPENDIX AFETY NFORMATION
WARNING: Fiber Optic ports – Optical Safety
Class 1
LASER PRODUCT
Never look at the transmit laser while it is powered on. Never look directly
at the fiber TX port and fiber cable ends when they are powered on.
WARNING: This device has more than one power input. Disconnect all
power inputs to power off this device.
WARNING: The installation of the Redundant Power Supply (RPS) should
only be carried out by properly trained and qualified personnel.
WARNING: These instructions must be read in conjunction with the RPS
flyer and the safety and installation instructions supplied with your RPS.
WARNING: When powering any Switch 5500 from an RPS, the unit must
be earthed (grounded). This can be achieved by either connecting the
power cord to the unit or by connecting the earth terminal on the rear of
the unit to a reliable electrical earth, or by connecting both. You must
ensure that the earth connection is made before connecting the DC
supply from the RPS.
WARNING: Any RPS must be approved as an SELV output in accordance
with IEC 60950-1/UL 60950-1/EN 60950-1.
WARNING: A standard 'positive-earthed' -48V redundant power system
suitable for use with telecommunications equipment should not be used
with the 3Com Power-over-Ethernet (PoE) network switches. In order to
meet the IEEE 802.3af (PoE) specification, the -48V output must be
isolated from earth (ground) and meet the isolation requirements in that
specification.
WARNING: The characteristics of the Switch 5500 DC supply input are
given in Appendix C on page 127.
WARNING: RPS Manufacturers recommendations must be followed
when connecting the cable to the RPS.