User's Manual

SC14CVMDECT Cordless Voice Module
© 2011 SiTel Semiconductor B.V. Company Confidential 24 August 19, 2011 v1.2.1
4.8.2 Deregistration
There are two ways of deregistering a PP from an FP:
• Remote FP and PP deregistration
The correct way to deregister a PP from an FP is to
deregister it remotely in the FP. If this is done over a
service connection from the PP to the FP, the FP
actually performs the deregistration and then it is
automatically signalled to the PP which in turn will
drop out- of-lock. Using this method it is also
possible to deregister other PPs registered to the FP
from one PP.
Removing all registration at once from the FP (e.g. in
case the original PPs are lost).
4.9 PCM INTERFACE
The audio is routed between the MCU and the CVM via
the PCM bus. The MCU is responsible for selection
and enabling of the audio path between the PCM bus
and the CVM when calls to the external line are
established. This is done with AT commands.
The CVM is responsible for connecting the right PCM
channel to the right handset for external calls when the
audio path between the CVM and the handset is
opened.
The physical PCM interface formats are illustrated in
the figures in this section.
The CVM supports the following PCM data formats
Linear PCM, 8 kHz sample rate.Used for narrowband
calls (G.726).
Linear PCM, 16 kHz sample rate.Used for wideband
calls (G.722).
G.711 – A-law, 8 kHz sample rate.Used for
narrowband calls (G.726).
G.711 – u-law, 8 kHz sample rate.Used for narrowband
calls (G.726).
• Compressed wideband using A-law, 16 kHz sample
rate.
The 16 bit PCM data is encoded as two 8 bit audio
samples if 8 kHz frame sync is used. Used for
wideband calls (G.722).
• Compressed wideband using u-law, 16 kHz sample
rate.
The 16 bit PCM data is encoded as two 8 bit audio
samples if 8 kHz frame sync is used. Used for
wideband calls (G.722).
Synchronization modes
In slave mode the PCM interface can be configured for
the following synchronization modes:
• Asynchronous system clock: In this mode the clock
of the module is not synchronized to the PCM clock.
This means that audio samples will be either
discarded in case the master PCM clock is faster
than the clock of the module or samples will be
repeated in case the master PCM clock is slower.
• Synchronous system clock: In this mode the clock of
the module will be adjusted to follow the PCM clock
provided by the master. In this case all audio
samples will be kept if the provided PCM clock has
an accuracy of +/- 5ppm which is a DECT radio
requirement.
Figure 15 Handling Product Identities