Nokia M5122 User Manual page 6

5. Connect the ADSL line cable between the DSL connector on the
M5122 back panel and the wall socket. After a while, the DSL
indicator starts blinking. This indicates that the ADSL line is being
established. When the DSL indicator remains lit, the line is
functional.
6. During normal operation PWR and DSL indicators are lit and the
Ethernet indicators of the active Ethernet ports blink or remain lit
depending whether there is traffic or not. COL indicator may blink
occasionally during normal operation.
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