Product Overview
September 2007 © 2007 Foundry Networks, Inc. 2 - 13
one of the supplies without interrupting operation. The remaining redundant supply provides enough power for all
the ports.
For power supply hardware specifications, see “Hardware Specifications” on page6-1.
NOTE: A FastIron GS POE device with dual power supplies may not provide redundancy, depending on how
much power the POE ports are consuming. See “Power Specifications for POE” on page2-13.
CAUTION: Remove the power cord from a power supply before you install it in or remove it from the device.
Otherwise, the power supply or the device could be damaged as a result. (The device can be running while a
power supply is being installed or removed, but the power supply itself should not be connected to a power
source.)
CAUTION: The FGS power supply is designed exclusively for use with the FGS devices. The power supply pro-
duces extensive power to support 802.3af applications. Installing the power supply in a device other than the FGS
will cause extensive damage to your equipment.

Power Specifications for POE

The actual implementation of the 802.3af standard limits power to 15.4W (44V to 57V) from the power sourcing
device. This is in compliance with safety standards and existing wiring limitations. Though limited by the 802.3af
standard, 15.4 watts of power is ample, as most powered devices consume an average of 5 to 12 watts of power.
IP phones, wireless LAN access points, and network surveillance cameras each consume an average of 3.5 to 9
watts of power.
Foundry’s 48-volt power supplies provide power to the POE daughter card, and ultimately to POE power-
consuming devices. The number of POE power-consuming devices that one 48-volt power supply can support
depends on the number of watts required by each power-consuming device. Each 48-volt power supply provides
480 watts of power for POE, and each POE port supports a maximum of 15.4 watts of power per POE power-
consuming device. For example, if each POE power-consuming device attached to the FastIron GS consumes 12
watts of power, one 48-volt supply will power up to 40 POE ports. You can install a second 48-volt supply for
additional POE power.
NOTE: If your FastIron GS POE chassis has 48 ports and only one power supply, and each POE-enabled port
needs 15.4 watts, then a maximum of 31 ports can supply power to connected devices.
For power supply specifications, see “Hardware Specifications” on page6-1. For POE configuration procedures,
see the Foundry FastIron Configuration Guide.
Precautions
The following precautions apply to the FastIron GS POE with 48 ports:
• If your FastIron GS POE chassis has 48 ports and two power supplies, and the POE ports are consuming
more than 480 watts of power, a single power supply failure will cause both power supplies to shut down.
• If your FastIron GS POE chassis has 48 ports and only one power supply, and the power consuming devices
connected to POE-enabled ports consume a total of more than 480 watts of power, the power supply may
shut down.
Cooling System and Fans
The FGS chassis has two single-speed fans that operate simultaneously. If one fan fails, it does not affect the
operation of the other fan.