Chapter 4: Web configuration 
318  NS3552-8P-2S-V2 User Manual 
 
The page includes the following fields: 
 
Object  Description 
Mode  Enables/disables the per port PD alive check function. All ports 
are disabled by default. 
Ping PD IP Address  Set the PoE device IP address in this field. The PD’s IP 
address must be set to the same network segment as the 
industrial managed switch. 
Interval Time (10~300s)  Set the length of time a ping request should be issued to the 
PD. Interval time range is from 10 to 300 seconds. 
Retry Count (1~5)  Set the number of times that system retry pings to the PD.  
For example, if the count is set to 2, and the system retries 
pings to the PD and the PD doesn’t respond continuously, the 
PoE port will be reset. 
Action  Set the action to be applied if the PD does not respond. Action 
selections are as follows: 
PD Reboot: The system resets the PoE port that connected 
the PD. 
Reboot & Alarm: The system resets the PoE port and issues 
an alarm message via syslog, SMTP.  
Alarm: The system issues an alarm message via syslog, 
SMTP. 
Reboot Time (30~180s)  Set the PoE device rebooting time. This is useful due to the 
different rebooting time of PoE devices. The PD alive check is 
not a defining standard, so the PoE device doesn’t report 
reboot complete information to the industrial managed switch. 
As a result, the user must ensure how long the PD reboot 
takes, and then set the time value in this column.  
The system checks the PD again according to the reboot time. 
If you cannot determine the precise booting time, we suggest 
set it to a longer time. 
Buttons 
•  Click Save to save changes. 
•  Click Reset to undo any changes made locally and revert to previously saved 
values.