User's Manual

SC14CVMDECT SF Cordless Voice Module
© 2012 Dialog Semiconductor B.V. 22 July 1, 2014 v1.6
4.10.2 Out-of-Range handling
When the PP goes in-range or out-of-range a signal is
sent from the PP to the MMI software indicating
whether the PP is in-lock or is out-of-lock with the FP.
4.10.3 Preamble antenna diversity
To optimise the audio quality caused by rapidly chang-
ing radio paths (fading), the SC14CVMDECT SF sup-
ports preamble antenna diversity. The preamble
diversity algorithm uses RSSI measurements to judge
the radio signal strength on both antennas and, as a
result, the choice of the best performing antenna is
determined. This antenna will then be used for the
receive slot and the next transmit slot.
The preamble antenna diversity is supported with two
antennas. The preamble diversity can be controlled by
VES. See document reference [4] and Section 4.13 for
more information about antenna diversity.
4.10.4 Broadcasting messages
Messages consisting of up to 19 bytes can be broad-
casted from FP to all registered PPs. Broadcasting
does not require an active connection. Broadcasting
does not use retransmission, therefore broadcasting is
not secured. If the real time clock is enabled this data is
also broadcasted to all PPs.
4.10.5 IWU to IWU messaging
The protocol in the SC14CVMDECT SF module is
made according to the DECT/GAP standard as defined
in EN 300 175 and EN 300 444.
The DECT standard defines an EMC code (see
EN 300 175-5, chapter 7.7.23.). This code is unique for
a DECT product and must be programmed by the
DECT manufacturer to the correct manufacturer code.
The EMC code must be the same for SC14CVMDECT
SF based product families when using the IWU to IWU
messaging.
If the Dialog default EMC VES value is changed the
IWU to IWU messaging may not operate correctly.
IWU data is transferred in a FA format frame; see
chapter 6.1 in EN 300 175-4. This frame has an infor-
mation field of maximum 63 bytes of which maximum
52 bytes can be used for IWU data. With the
SC14CVMDECT SF it is only possible to send
5 frames in a row without pause. The following frame
must be an acknowledge-frame to secure that the
internal buffers within the SC14CVMDECT SF are
emptied.
The FA frame is segmented in 5 byte fragments and
transferred over the air-interface in the A-field. The 2-
bytes CRC is used to determine if the data is received
correctly. If the data is not received correctly this is sig-
nalled back to the transmitter by the Q2 bit, and the
data is retransmitted.
The FA frame has a 2 bytes checksum, used to deter-
mine if the complete packet is received correctly. If A
checksum error is signalled back to the transmitter and
the complete packet is retransmitted. The packet will
be retransmitted until it is received correctly, or until the
link is closed.
More transmitted packets will be received in the same
order as they were transmitted. The application must
handle flow control, if needed.
4.11 REGISTRATION
The PP and the FP must be paired using a procedure
called Registration. Without Registration, the PP will be
out-of-lock and will not be able to establish a link to a
FP and therefore not be able to make a call. The regis-
tration uses the unique product identities and secures
the PP and FP to allow no cross-communication.
The PP can be de-registered from a FP either via the
FP or PP MMI Software using the command interface.
It is also possible to deregister a PP from another reg-
istered PP.
It is possible to pair a PP and FP during the production.
4.11.1 Handling product identities
To secure that the FP and PPs do not make cross-
communications a unique ID must be entered into the
VES of an FP or PP. For the DECT version the ID for
the FP is named RFPI and for the PP the ID is named
IPEI. These numbers are factory settings.
After a successful registration, the IPEI is stored in the
FP and the RFPI is stored in the PP. In this way the two
parts are known to each other and are allowed to make
connections. The registration data are automatically
stored in VES of the FP and PP while making the regis-
tration.
It is possible to register the same PP to 2 FPs, but it
can only be used in one FP at the same time.