American Fibertek Net I/O N-111 - Manual (Page 42)

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Watchdog
The N-111 has a watchdog function which can be used to monitor a network-
connected device for failure, and perform user-configurable actions when that device
fails to respond.
When the Watchdog feature is enabled, the N-111 will send ping requests to the
target IP address at a frequency determined by the Interval setting. The N-111 will wait
for a period of time determined by the Timeout setting for a response to each ping
message. If it does not receive a ping response for a ping, it will increment a counter
which records the number of consecutive failed pings. A single successfully received
ping response will set this counter to zero. When a number of failed ping responses
equal to the Failures setting has occurred, the unit will take some action as determined
by user settings. It will then wait for a number of minutes determined by the Restart
Delay setting before sending any more ping messages.
Setting Default Value Range
Enabled Not Enabled Enabled
Not Enabled
Ping IP Address 0.0.0.0 15 characters
Interval 15 seconds 1-9999 seconds
Timeout 3 seconds 1-9999 seconds
Failures 3 1-9999
Restart Delay 5 minutes 1-9999 minutes