PoE Port Status LEDs
B-2 About PoE (Power over Ethernet)
PoE Port Status LEDs
The PoE port status of each 10/100/1000 Mbps RJ45 port on an S-Series I/O module is indicated by
the RX and TX LEDs for each port. To observe the PoE port status indications, you must switch the
S-Series I/O module 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 the Enterasys S-Series I/O Module Hardware Installation Guide.
Allocation of PoE Power to Devices
When equipped with a PoE subsystem and S-POE-PS power supplies, the S-Series chassis
provides dedicated PoE power for powered devices (PDs) attached to the 10/100/1000 Mbps RJ45
ports on the installed S-Series I/O modules.
The S-Series firmware determines the power available for PoE based on power supply status and
power supply redundancy mode. 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 a trap
to notify the system manager.
For more information on configuring allocation mode, see the Enterasys S-Series CLI Reference.
Management of PoE Power to PDs
You can configure how the S-Series chassis makes power available to attached PDs:
• Real-time mode (default), in which the PoE controller calculates the power needed by a PD
based on the actual power consumption of the attached devices.
• Class mode, in which the PoE controller manages power based on the IEEE 802.3at definition
of the class limits advertised by the attached devices. In this mode, the maximum amount of
power required by a device in the advertised class is reserved for the port, regardless of the
actual amount of power being used by the device.
For more information on configuring power management mode, see the Enterasys S-Series CLI
Reference.
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