3Com 4500G Series, Руководство по началу работы

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28 C
HAPTER
2: I
NSTALLING THE
S
WITCH
power required to the device, providing that the total power budget for the switch
is not exceeded.
A PoE switch combines the functionality of a standard Ethernet switch with a
single power supply that can power multiple devices. Using a PoE switch has the
following advantages over an non-powered network.
■
Reduced Cabling — a PoE (802.3af) compliant device that has its power
supplied over its Ethernet cable does not require a separate power supply. If,
for example, you use the switch to connect a 3Com 11 Mbps Wireless LAN
Access Point 8500 to the network, then only a network cable is required to
provide both power and network connectivity.
■
Increased Reliability — a device powered by a PoE switch can take advantage
of the facilities available to the switch. You can fit the switch with a redundant
power supply or uninterruptible power supply to increase its uptime.
The switch supports resistor detection according to IEEE 802.3af and pre-standard
detection methods.
The Switch 4500G supports 3Com 802.3af equipment. For the latest list of
supported devices, refer to the product page on the 3Com web site at
http://www.3com.com/
For additional information on Power over Ethernet, refer to the Power over
Ethernet Configuration chapter in the Configuration Guide available on the 3Com
Web site. Power over Ethernet management is available using the web interface or
the command line interface (CLI).
Connecting Console
Cable
Console Cable A Console cable is an 8-core cable. One end of the cable is a crimped RJ-45
connector for the connection to the Console port of the switch, and the other end
is a DB-9 female connector for the connection to the serial port on the Console
terminal, as shown in Figure 16.
Figure 16 Console cable