3Com Switch 7750 Configuration Guide Guide

61
POE PSU SUPERVISION
CONFIGURATION
Introduction to PoE
PSU Supervision
The PoE-enabled Switch 7750 Family can monitor the external PoE power supply
units (PSUs) through Switch Fabrics.
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The PSE performance will be affected by fast switching of PoE PSUs. The interval
of switching PoE PSUs must be no less than 5 seconds.
AC Input Alarm
Thresholds
Configuration
You can set the AC input alarm thresholds for the PoE PSUs to enable the Switch
7750 Family to monitor the AC input voltages of the PSUs in real time through
Switch Fabrics.
Configuring AC Input
Alarm Threshold
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■ You can set the thresholds to any appropriate values in the range, but make
sure the lower threshold is less than the upper threshold.
■ For 220 VAC input, it is recommended to set the upper threshold to 264.0 V
and the lower threshold to 181.0 V.
■ For 110 VAC input, you are recommended to set the upper threshold to 132.0
V and the lower threshold to 90.0 V.
AC Input Alarm
Threshold Configuration
Example
Network requirements
■ Set the overvoltage alarm threshold of AC input for PoE PSUs to 264.0 V.
Table 526 PoE PSU supervision configuration tasks
Operation Description Related section
Configure AC input alarm
thresholds
Required
“AC Input Alarm Thresholds
Configuration”
Configure DC input alarm
thresholds
Required
“DC Output Alarm Threshold
Configuration”
Table 527 Configure AC input alarm thresholds
Item Command Description
Enter the system view system-view -
Set the overvoltage alarm
threshold of AC input (upper
threshold) for the PoE PSUs
poe-power input-thresh
upper string
Required, and the max
voltage is 264.0 V.
Set the undervoltage alarm
threshold of AC input (lower
threshold) for the PoE PSUs
poe-power input-thresh
lower string
Required, and the min voltage
is 90.0 V.