D-Link DES-1252 - Manual (Page 53)

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RX (receive) mode: Duplicates the data that gets sent to the source
and forwards it to the Target Port.
Both (transmit and receive) mode: Duplicate both the data
transmitted from and data sent to the source port, and forwards all the
data to the assigned Target Port.
None: Turns off the mirroring of the port.
QoS > 802.1p Default Priority
This feature displays the status Quality of Service priority levels of
each port, and for packets that are untagged, the switch will assign the
priority in the tag depending on your configuration.
Figure 378 – QoS > 802.1p Default Priority
Security > Safeguard Engine
D-Link’s Safeguard Engine is a robust and innovative technology
that automatically throttles the impact of packet flooding into the