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SAMBA 75 USER'S GUIDE
5 GSM/GPRS APPLICATION INTERFACE
5.1 Description of operating modes
The chapter below briefly summarizes the various operating modes referred to 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 data call, or
sending/receiving a SMS during a GPRS connection. During data calls or SMS,
GPRS services are suspended and then resumed automatically after the call
or SMS session has been ended.
5.1.1 Normal mode operation
5.1.1.1 GSM/GPRS SLEEP
Various power save modes set with AT+CFUN command, see related documents [3].
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.
5.1.1.2 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.
5.1.1.3 GPRS/EDGE IDLE
Module is ready for GPRS/EDGE data transfer, but no data is currently sent or
received. Power consumption depends on the network settings and the GPRS/EDGE
configuration (e.g. multislot settings).
5.1.1.4 GPRS/EDGE DATA
GPRS/EDGE data transfer in progress. Power consumption depends on the network
settings (e.g. power control level), uplink/downlink data rates and GPRS/EDGE the
configuration (e.g. used multislot settings).
5.1.2 Power down
Normal shutdown after sending the AT^SMSO command. The Power Supply ASIC
(PSU-ASIC) disconnects the supply voltage from the base band part of the circuit.
Only a voltage regulator in the PSU-ASIC is active for powering the RTC. Software is
This confidential document is a property of FALCOM GmbH and may not be copied or circulated without previous permission.
VERSION 1.01
Page 18
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