Baseband Module, Functional Description; Modes Of Operation; Analog Control Channel Mode (Acch); Analog Voice Channel Mode (Avch) - Nokia NSW-6 Series Technical Documentation Manual

PAMS Technical Documentation

Baseband Module, Functional Description

Modes of Operation

The phone has the following main operating modes
– Analog mode, on 800 MHz band
– Digital mode, on 800 MHz band
– Digital mode, on 1900 MHz band
– Out Of Range –mode
– Locals mode
Analog Control Channel mode (ACCH )
On analog control channel the phone receives continuous signalling
messages on Forward Control Channel (FOCC) from base station, being
most of the time in IDLE mode. Only the receiver part is on. Occasionally
the phone re–scans control channels in order to find the stronger or
otherwise preferred control channel.
Also registration (TX on) happens occasionally, whereby the phone sends
its information on Reverse Control Channel (RECC) to base station and
the phone's location is updated in the switching office.
If a call is initiated, either by the user or base station, the phone moves to
analog voice channel or digital traffic channel mode depending on the
orders by the base station.

Analog Voice Channel Mode (AVCH)

The phone receives and transmits analog audio signal. All circuitry is
powered up except digital rx–parts. In this mode the DSP does all the au-
dio processing and in the Hands Free (HF) mode it also performs echo–
cancellation and the HF algorithm. COBBA performs the AD–conversion
for the MIC signal, and the DA–conversion for the EAR signal.
Issue 1 12/99
– Analog Control Channel
– Analog Voice Channel
– Digital Control Channel
– Digital Traffic Channel
– Digital Control Channel
– Digital Traffic Channel
E Nokia Mobile Phones Ltd.
NSW-6
System Module SE2
ACCH
AVCH
DCCH
DTCH
DCCH
DTCH
OOR
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