American Fibertek SM9p - Manual (Page 134)

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Event Configuration interface
 Port event selection: select the per port events and per port SMTP events. It has 3
selections – Link UP, Link Down, and Link UP & Link Down. Disable means no event
is selected.
 Link UP: the system will produce a log message when port connection is up
only.
 Link Down: the system will produce a log message when port connection is
down only.