User Manual

SAMBA 55/56 VERSION 1.03
4 GSM/GPRS application interface
4.1 Description of operating modes
The chapter below briefly summarizes the various operating modes referred to
in the following chapters.
Definition of the GPRS class B mode of operation:
The definition of GPRS class B mode is, that the MS can be attached to both
GPRS and other GSM services, but the MS can only operate one set of
services at a time. Class B enables making or receiving a voice call, or
sending/receiving an SMS during a GPRS connection. During voice calls or
SMS, GPRS services are suspended and then resumed automatically after the
call or SMS session has ended.
4.1.1 Normal mode operation
4.1.1.1 GSM/GPRS SLEEP
Various power save modes set with AT+CFUN command. Software is active to
minimum extent. If the module was registered to the GSM network in IDLE
mode, it is registered and paging with the BTS in SLEEP mode, too. Power
saving can be chosen at different levels: The NON-CYCLIC SLEEP mode
(AT+CFUN=0) disables the AT interface. The CYCLIC SLEEP modes
AT+CFUN=5,6,7,8 and 9 alternatively activate and deactivate the AT
interfaces to allow permanent access to all AT commands.
4.1.1.2 GSM IDLE
Software is active. Once registered to the GSM network, paging with BTS is
carried out. The module is ready to send and receive.
4.1.1.3 GSM TALK
Connection between two subscribers is in progress. Power consumption
depends on network coverage individual settings, such as DTX off/on,
FR/EFR/HR, hopping sequences, antenna.
4.1.1.4 GPRS IDLE
Module is ready for GPRS data transfer, but no data is currently sent or
received. Power consumption depends on network settings and GPRS
configuration (e.g. multislot settings).
4.1.1.5 GPRS DATA
GPRS data transfer in progress. Power consumption depends on network
settings (e.g. power control level), uplink/downlink data rates and GPRS
configuration (e.g. used multislot settings).
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