NSW-5
System Module UT5U
PAMS Technical Documentation
Page 15
Issue 1 10/00
Nokia Mobile Phones Ltd.
according to the slot timing. MCU is waken up mainly by DSP, when
there is signalling information for the Cellular Software.
In Digital Data Channel Mode audio processing is not needed and the au-
dio circuitry can be shut down. Otherwise the mode is similar to Digital
Voice Channel Mode.
Out of Range Mode (OOR)
If the phone cannot find signal from the base station on any control chan-
nel (analog or digital) it can go into OOR mode for power saving.
All RF circuits are powered off and baseband circuits are put into low
power mode, VCXO is stopped and only sleep clock is running in MAD
and CCONT. After the programmable timer in MAD has elapsed the
phone turns receiver on and tries to receive signalling data from base sta-
tion. If it succeeds, the phone goes to standby mode on analog or digital
control channel. If the connection can not be established the phone will
return to out of range mode, until the timer elapses again.
