Connecting A Redundant Power Supply To Your Switch 4500 Pwr - 3Com 3CR17561-91-US - Switch 4500 26PORT Managed 24 10/100 2 Gbe Stackable RJ45 Getting Started Manual

28 C 2: I
HAPTER NSTALLING THE
Connecting a
Redundant Power
Supply to your
Switch 4500 PWR
S
WITCH
6 Finally, place a unit information label on the unit in an easily accessible
position. The unit information label shows the following:
3Com product name of the Switch
■
3Com 3C number of the Switch
■
Unique MAC address (Ethernet address) of the Switch.
■
Serial number of the Switch
■
You may need this information if you contact 3Com Technical Support.
The Switch 4500 PWR 26 and 50 port have a -48V DC Redundant Power
Supply socket.
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 4500 PWR 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.
3Com Switches which support -48V DC RPS inputs, that are PoE enabled,
can only be powered by an RPS which complies with the isolation
requirements of IEEE-Std 802.3af. Non PoE enabled switches do not have
this restriction.
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.