D-Link 16-Port 10/100/1000Mbps Gigabit Ethernet Switch + 2-Port Mini GBIC Web-Smart Switch DGS-1216T - Manual (Page 50)

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Trap Setting
The Trap Setting enables the device to monitor the Trap through the
Web Management Utility, set the Trap IP Address of the manager
where the trap to be sent.
Figure 38. Trap Setting
System Events: Monitoring the system’s trap.
Device Bootup: a trap when booting up the system.
Illegal Login: a trap when there is using a wrong password
login, and it will record from where the IP to be login.
Fiber Port Events: Monitoring the Fiber port status.
Link Up/Link Down: a trap when there is linking status
happens in fiber port.
Abnormal* Receive Error: a trap when there are receive data
error in fiber port.
Abnormal* Transmit Error: a trap when there are transmit
data error in fiber port.
Copper Port Events: Monitoring the Copper port status.
Link Up/Link Down: a trap when there is linking status
happens in copper port.