Reference Guide
792 | Power over Ethernet and Power over Ethernet Plus
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On the C-Series, if the Power Supply 1200W-AC is installed, then each PSU used for PoE (units 4-7 on the
C300, and 3-4 on the C150) provides 1200 Watts of power. However, each actually makes available
1478.40 Watts for PoE. This is possible because each unit, once installed, borrows 278.40 Watts from the
system redundancy power supply. If a power supply used for PoE is removed, PoE ports are shut down so
that the system redundancy PSU retains its capability.
The
Power Supply 1600W-AC is auto-sensing and can provide either 1200W or 1600W, depending upon
the input power source. Low-line (100-130VAC) input yields 1200W/54V and high-line (>180VAC) input
yields 1600W/54V. You can have both 1200W and 1600W output, as long as all PSUs are
Power Supply
1600W-AC.
On the C300, if the
Power Supply 1600W-AC output rating is 1600W, then 2 PSUs (1+1) are sufficient to
operate the system and provide redundant power. In a case where the
Power Supply 1600W-AC output
rating is 1200W, redundancy will require 3 PSUs (2+1). Any additional PSUs beyond those required for
redundancy will be used for PoE/PoE+.
On the C150, the redundancy scheme is always 1+1, even if both
the Power Supply 1600W-AC are
yielding 1200W.
When calculating how many PSUs will be required to support the devices on the unit, allow for the number
of PSUs required for redundancy, and then calculate the power required by the PoE/PoE+ devices
supported by the unit to see how many additional PSUs are required.
Configuring PoE/PoE+
Configuring PoE/PoE+ is a two-step process:
1. Connect the IEEE 802.3af/802.3at -compliant powered device directly to a port.
2. Enable PoE/PoE+ on the port, as described next.
Related Configuration Tasks
• Manage Ports using Power Priority and the Power Budget
• Monitor the Power Budget
• Manage Power Priorities
• Recover from a Failed Power Supply
• Power Additional PoE Ports on the S-Series
Note: The S25V and S50V models contain AC power supplies in order to support PoE. You can also add
the external Dell Networking 470W Redundant Power Supply to power more PoE devices. For details,
see Power Additional PoE Ports on the S-Series and see the power budget command in the Power Over
Ethernet (PoE) chapter of the FTOS Command Reference for the S-Series.