The Power-up Sequence 31
CAUTION The Switch has no ON/OFF switch; the only method of
connecting or disconnecting mains power is by connecting or
disconnecting the power cord.
CAUTION: The Switch can only use a SuperStack Advanced Redundant
Power System output.
Using Power over
Ethernet
The Switch 4400 PWR can power any IEEE 802.3af compliant device
through any of its front panel ports. For the latest list of supported
devices, go to the product page on the 3Com web site:
http://www.3com.com/.
For further information about Power Over Ethernet, refer to “Power
Management and Control” in the Switch Implementation Guide supplied
on the CD-ROM that accompanies your Switch. Power over Ethernet
management is available using the web interface or the command line
interface (CLI).
Choosing the Correct
Cables (Switch 4400,
4400 SE and
4400 PWR)
All of the ports on the front of the Switch 4400, 4400 SE and 4400 PWR
are Auto-MDIX, that is they have a cross-over capability. The port can
automatically detect whether it needs to operate in MDI or MDIX mode.
Therefore you can make a connection to a port with a straight-through
(MDI) or a cross-over cable (MDIX).
The Auto-MDIX feature only operates when enabled per port and if
auto-negotiation is enabled.
If auto-negotiation is disabled, all the Switch ports are configured as
MDIX (cross-over). If you want to make a connection to another MDIX
port, you need a cross-over cable. Many ports on workstations and
servers are configured as MDI (straight-through). If you want to make a
connection to an MDI port, you need to use a standard straight-through
cable. See Tabl e 7
.
WARNING: The 4400 PWR (3C17205) supports Power over Ethernet on
all front ports. These ports should only be used for Ethernet wiring within
the same building. The Rear Module ports of the Switch 4400 PWR can
be used for ethernet wiring between buildings.
3Com recommends that you use Category 5 twisted pair cable — the
maximum segment length for this type of cable is 100 m (328 ft).
DUA1720-3AAA09.book Page 31 Wednesday, July 6, 2005 4:33 PM
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