3Com 5500-EI Getting Started Guide - Page 41

RPS LED, Using Power over Ethernet, The Switch 5500G-EI Power over Ethernet PoE units can supply power - 5500g ei configuration

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Connecting a Redundant Power Supply 41 RPS LED The RPS status LED on the front of the Switch 5500 indicates the status of the RPS and AC supplies as shown in Table 16. Table 16 RPS LED Colors Color Green Yellow Off State The AC and RPS supply is connected. The AC supply has failed or is not connected. The RPS supply is connected. There is no RPS supply connected. Using Power over Ethernet The Switch 5500G-EI Power over Ethernet (PoE) units can supply power to any IEEE 802.3af compliant device through any of its front panel ports over a Category 5 or Category 5e Ethernet cable. The same cable connects the device to the network. The Switch 5500 units can supply power through the 10/100 ports only. Power over Ethernet is a self-configuring protocol. When you plug a PoE compliant device into one of the ports on the switch, the switch supplies the 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.

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Connecting a Redundant Power Supply
41
RPS LED
The RPS status LED on the front of the Switch 5500 indicates the status of
the RPS and AC supplies as shown in Table 16.
Table 16
RPS LED Colors
Using Power over
Ethernet
The Switch 5500G-EI Power over Ethernet (PoE) units can supply power
to any IEEE 802.3af compliant device through any of its front panel ports
over a Category 5 or Category 5e Ethernet cable. The same cable
connects the device to the network.
The Switch 5500 units can supply power through the 10/100 ports only.
Power over Ethernet is a self-configuring protocol. When you plug a PoE
compliant device into one of the ports on the switch, the switch supplies
the 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.
Color
State
Green
The AC and RPS supply is connected.
Yellow
The AC supply has failed or is not connected. The RPS
supply is connected.
Off
There is no RPS supply connected.