Poe Port Status Leds; Allocation Of Poe Power To Devices; Power Distribution Upon Power Supply Removal Or Addition - Enterasys SSA-T1068-0652 Hardware Installation Manual

PoE Port Status LEDs

PoE Port Status LEDs
The PoE port status of each 10/100/1000 Mbps RJ45 port is indicated by the two‐color RX and TX
LED display for each port. To observe the PoE port status indications, you must switch the SSA
from the default RX/ TX status mode to the PoE Port status mode using the red PoE button. The
switch operation and a description of how to use the LED indications are described in "Port
LEDs" on page 3‐1.

Allocation of PoE Power to Devices

The S‐Series firmware determines the power available in the SSA for PoE based on power supply
status and power supply redundancy mode. The system calculates and reserves the correct
amount of power required by the SSA and then makes the balance of power available for PoE.
When any change is made to the power supply status or redundancy mode, the firmware
recalculates the power available for PoE.
The power available for PoE is distributed based on the configured allocation mode:
• Automatic mode (default), in which available power is distributed evenly. Any change in
available power, due to a change in power supply status or redundancy mode, will trigger an
automatic redistribution of power.
• Manual mode, in which the power budget is manually configured, using either CLI
commands or the MIBs. The wattage configured cannot exceed the total power available on
the switch for PoE.
The configured wattage assignment is used to calculate the total available PoE power. If the
total available PoE power changes, a redistribution of available power will occur, applying the
calculated percentage.
If the PoE power needed or requested exceeds the power available, the system will generate an
SNMP trap to notify the system manager.
For more information on configuring allocation mode, see the Enterasys S‐Series CLI Reference
Guide.

Power Distribution Upon Power Supply Removal or Addition

When a power supply is removed, the SSA responds to the decrease in available power by doing
the following:
1. Detecting the power supply removal and recalculating available power.
2. Subtracting the power capacity for its base system from available power.
3. Distributing remaining power equally for PoE.
4. Dropping support to PoE devices as necessary to stay within the programmed maximum
power.
When a power supply is added, the SSA responds to the increase in available power by doing the
following:
1. Detecting the power supply addition and recalculating available power.
2. Subtracting the power capacity for its base system from available power.
3. Distributing remaining power equally for PoE.
C-2 About PoE (Power over Ethernet)