User Manual
Table Of Contents
- INTRODUCTION
- SECURITY
- TECHNICAL DATA
- GSM/GPRS APPLICATION INTERFACE
- HARDWARE INTERFACES
- GENERAL GUIDELINES FOR THE USE OF THE TANGO55/56
- HOUSING
- APPENDIX
- HOW TO UPDATE THE NEW FIRMWARE INTO THE TANGO55/56 MODEMS
- RF EXPOSURES
TANGO55/I & TANGO56/I VERSION 1.03
3 GSM/GPRS APPLICATION INTERFACE
3.1 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 voice call, or
sending/receiving a SMS during a GPRS connection. During voice calls or
SMS, the GPRS services will be suspended and then resumed automatically
after the call or SMS session has been ended.
3.1.1 Normal mode operation
3.1.1.1 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.
3.1.1.2 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.
3.1.1.3 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.
3.1.1.4 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).
3.1.1.5 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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