Canon PIXMA MX459 Online Manual page 189

A mark indicates the result of the connection performance measurement between the printer and
the access point.
: Good connection performance
: Unstable connection performance
: Cannot connect
: Measurement is canceled, or cannot measure
2. Remeasurement
Measures the connection performance again.
Note
If any messages appear on Overall Network Performance:, move the machine and access
point as instructed to improve the performance.