Power Management - Nortel 4500 Series Overview-System Configuration

External power source connected to back of the Nortel Ethernet Routing Switch 4548GT-PWR

Power management

The Nortel Ethernet Routing Switch 4548GT-PWR and the 4550T-PWR use
several device-management systems, such as the Web-based Management
Interface, the CLI, and Device Manager (DM), as well as Enterprise for
network-level management services.
By using the CLI, Web, or DM, you can configure the level of power to
specific ports, and enable or disable power to each port. You can set the
maximum power level for each port by increments of 1 W—in the range of 3
W to 16 W. The default power level for each port is 16 W.
You can configure the power priority of each port by choosing low, high, or
critical power priority settings. The switch automatically drops low-priority
ports when the power requirements exceed the available power budget. If
the power requirements are lower than the switch power budget, the power
returns to the dropped port.
For example, assume the following scenario:
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Copyright © 2007, Nortel Networks
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Note: A screw connects the ground wire, and a star washer is on the
base of the Nortel Ethernet Routing Switch 4548GT-PWR.
ports 1 to 40 are configured as low priority
port 41 is configured as high priority
ports 1 to 40 are connected to powered devices
devices on ports are consuming all the available switch power
Nortel Ethernet Routing Switch 4500 Series
Overview — System Configuration
NN47205-500 02.01 Standard
5.0 23 February 2007
Power management 157
Nortel Networks Confidential