Power specifications for, Power specifications for poe – Brocade FastIron GS and GS-STK Hardware Installation Guide User Manual
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Brocade FastIron GS and GS-STK Hardware Installation Guide
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Hardware features
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DRAFT: BROCADE CONFIDENTIAL
CAUTION
Disconnect the power supply cable from the power source (outlet) before you install it in or
remove it from the device. Failure to do this can result in damage to the power supply or the
device, or both. (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 FGS and FGS-STK devices. Installing
the power supply in a device other than an FGS or FGS-STK will cause extensive damage to your
equipment.
Power specifications for POE
The implementation of the 802.3af standard limits power to 15.4W (44V to 57V) from the power
sourcing device. This limit complies 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.
Brocade 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 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 FGS 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 or GS-STK POE device 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, refer to
on page 67. For POE
configuration procedures, refer the FastIron Configuration Guide.
Precautions
The following precautions apply to the FastIron GS or GS-STK POE with 48 ports:
•
If your FastIron GS or GS-STK POE device 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 or GS-STK POE device 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.