Nokia 9000i Service Manual page 192

RAE/RAK–1N
Service Software
3.4 – Internal Audio Loop
This test interface allows selection of input and output (Internal / External /
Phf) and also connects and disconnects the test loop. The sent audio
signal level has a constant value which depends on the selected
interfaces.
When <Esc> key is used, the internal loop is automatically ended
(Loop=Off).
3.5 – External Audio Loop
The first item selects the interface (Internal/External/Phf).
The sent audio signal level has a constant value which depends on the
interface. When the frequency is changed, the received signal strength is
measured and if too big an error message is displayed. Three different
frequencies are used.
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