FALCOM SAMBA 75 User manual

This document is available at HTTP://WWW.FALCOM.DE/
SAMBA 75
User’s manual
Version 1.01, 18/10/2005

SAMBA 75 USER’S GUIDE VERSION 1.01
Index of contents
0INTRODUCTION .......................................................................5
0.1 GENERAL................................................................................................................................5
0.2 SCOPE OF DELIVERY.................................................................................................................6
0.3 USED ABBREVIATIONS ...............................................................................................................6
0.4 RELATED DOCUMENTS ..............................................................................................................7
1SECURITY .................................................................................8
1.1 GENERAL INFORMATION...........................................................................................................8
1.2 EXPOSURE TO RF ENERGY.........................................................................................................8
1.3 EFFICIENT MODEM OPERATION ..................................................................................................8
1.4 ANTENNA CARE AND REPLACEMENT..........................................................................................8
1.5 DRIVING .................................................................................................................................9
1.6 ELECTRONIC DEVICES...............................................................................................................9
1.7 VEHICLE ELECTRONIC EQUIPMENT..............................................................................................9
1.8 MEDICAL ELECTRONIC EQUIPMENT ............................................................................................9
1.9 AIRCRAFT ...............................................................................................................................9
1.10 CHILDREN...............................................................................................................................9
1.11 BLASTING AREAS................................................................................................................... 10
1.12 POTENTIALLY EXPLOSIVE ATMOSPHERES ................................................................................... 10
1.13 NON-IONIZING RADIATION .................................................................................................... 10
2SAFETY STANDARDS..............................................................11
3TECHNICAL DATA .................................................................12
3.1 GENERAL SPECIFICATIONS OF SAMBA 75 ............................................................................. 12
3.1.1 Power consumption....................................................................................................... 14
4INTERFACES IN OVERVIEW ...................................................15
4.1.1.1 Interface A (4-pin USB Type A connector) .............................................................................. 15
4.1.1.2 Interface B (Optical interface) .................................................................................................16
4.1.1.3 Interface C (SIM-Card interface) ............................................................................................. 16
4.2 FUNCTIONAL DESCRIPTION..................................................................................................... 17
5GSM/GPRS APPLICATION INTERFACE .................................18
5.1 DESCRIPTION OF OPERATING MODES...................................................................................... 18
5.1.1 Normal mode operation ............................................................................................... 18
5.1.1.1 GSM/GPRS SLEEP........................................................................................................................ 18
5.1.1.2 GSM IDLE..................................................................................................................................... 18
5.1.1.3 GPRS/EDGE IDLE......................................................................................................................... 18
5.1.1.4 GPRS/EDGE DATA ..................................................................................................................... 18
5.1.2 Power down .................................................................................................................... 18
5.1.3 Alarm mode .................................................................................................................... 19
5.2 POWER UP / POWER DOWN SCENARIOS ............................................................................... 19
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SAMBA 75 USER’S GUIDE VERSION 1.01
5.2.1 Turn on SAMBA 75........................................................................................................... 19
5.2.1.1 Reset SAMBA 75 via AT+CFUN Command .............................................................................. 19
5.2.2 Turn off SAMBA 75........................................................................................................... 19
5.2.2.1 Turn off SAMBA 75 Using AT Command ................................................................................... 19
5.2.3 Automatic Shutdown..................................................................................................... 20
5.3 AUTOMATIC EGPRS/GPRS MULTISLOT CLASS CHANGE ........................................................ 20
6SYSTEM REQUIREMENTS ........................................................22
6.1 HARDWARE & SOFTWARE REQUIREMENTS................................................................................ 22
6.2 GET STARTED ........................................................................................................................ 22
6.2.1 Installing your SAMBA 75 on a Laptop computer running Windows® XP.............. 22
6.2.1.1 How to use SAMBA 75 phone with a terminal software, only................................................ 23
6.2.1.2 Setup HyperTerminal program:................................................................................................. 25
6.2.1.3 Making a dial-up networking.................................................................................................... 26
6.2.2 Communications software............................................................................................ 26
6.2.3 PIN & PUK ......................................................................................................................... 26
6.2.4 Text messages ................................................................................................................. 26
6.2.5 Data and fax communication ..................................................................................... 27
7RF EXPOSURES.......................................................................28
8APPENDIX..............................................................................29
8.1 TROUBLESHOOTING............................................................................................................... 29
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SAMBA 75 USER’S GUIDE VERSION 1.01
Version history:
Released date Version number Author Changes
29/09/2005 1.00 Fadil Beqiri Initial version
18/10/2005 1.01 Fadil Beqiri Chapter 7, “RF Exposures” added
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SAMBA 75 USER’S GUIDE VERSION 1.01
Cautions
Information furnished herein by FALCOM are accurate and reliable. However, no
responsibility is assumed for its use.
Please, read carefully the safety precautions.
If you have any technical questions regarding this document or the product
described in it, please contact your vendor.
General information about FALCOM and its range of products are available at the
following Internet address: http://www.falcom.de/
Trademarks
Some mentioned products are registered trademarks of their respective companies.
Copyright
SAMBA 75 user’s guide is copyrighted by FALCOM GmbH with all rights reserved. No
part of this user’s guide may be produced in any form without the prior written
permission of FALCOM GmbH.
FALCOM GmbH.
No patent liability is assumed with respect to the use of the information contained
herein.
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SAMBA 75 USER’S GUIDE VERSION 1.01
0 INTRODUCTION
0.1 General
This manual is focussed on the GSM/GPRS/EDGE data solutions of the enhanced
performance SAMBA 75 USB modem from FALCOM GmbH.
The SAMBA 75 is a Plug-and-Play, compact, light-weight, wireless modem that
provides EDGE, GPRS and GSM connectivity for portable, handheld computers and
others. The SAMBA 75 maintains the same form-factor of the well-known SAMBA
GSM/GPRS modem. The major benefit over earlier SAMBA GSM/GPRS modem is that
SAMBA 75 supports EDGE and additionally offers a TCP/IP stack. The SAMBA 75
modem is designed to place and receive data calls but not voice calls.
SAMBA 75 allows subscribers to send and receive data, including digital images, web
pages and photographs, with a transfer rate three times higher than possible with
GSM/GPRS sevices. It supports Data, SMS, fax as well as it offers a choice of seven
different ringing tones/melodies, which are easily selectable using AT command. It
can be easily controlled by using AT commands for all kinds of operations. The
SAMBA 75 is designed for use on any GSM network in the world, it is a Quad-Band
EDGE and GSM/GPRS engine that works on the four frequencies GSM 850, GSM 900,
DCS 1800 MHz and PCS 1900 MHz and it can be used in all existing GSM networks in
Europe, the U.S.A. and Asia. This full type approved integrated modem constitutes a
self contained, fully integrated implementation of the GSM/GPRS and EDGE
functionalities. The SAMBA 75 provides an integrated SIM card reader and an
internal GSM antenna.
The physical interface to the modem application is made through an embedded
USB connector. It consists of 4 pins, required for controlling the unit, transferring data
and providing power supply lines. The embedded USB interface allows it direct
connection to a USB serial port of desktop or notebook computers. The SAMBA 75
features GPRS multi-slot class 12 and supports the GPRS coding schemes CS-1, CS-2,
CS-3 and CS-4. The SAMBA 75 equipment supports GPRS Class-B. This means, that the
Mobile Station can set up a GSM call (CSD or fax) while it is GPRS attached.
The SAMBA 75 features EDGE multi-slot class 10 and supports the modulation and
coding schemes MCS-1 … MCS-9.
About GPRS
GPRS is a high-speed, data-only service that is an add-on to the GSM
(Global System for Mobile Communications) cellular network - a type of
network used to provide cellular phone service.
The SAMBA 75 Modem provides reliable data connections to GPRS 850 MHz
(GSM), GPRS 850 (GSM), 1800 MHz (DCS) and 1900 MHz (PCS) networks.
When in regions where GPRS is not available, user can still establish 14.4
kbps GSM data connections.
About EDGE
Enhanced Data rates for GSM Evolution (EDGE) is a third-generation (3G)
high-speed mobile data and Internet access technology, with theoretical
peak rates of 473 kbps and average throughput of 110-130 kbps. The
average rates are fast enough to support a wide range of advanced data
services, including streaming audio and video, fast Internet access and
large file downloads.
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SAMBA 75 USER’S GUIDE VERSION 1.01
0.2 Scope of delivery
Check the contents of the package. The following listed items should be included. In
case of damaged or missing any item, please, contact your vendor immediately.
SAMBA 75-SET (included) SAMBA-USB-KIT* (accessories)
Name Part Quantity
SAMBA 75 1
SAMBA 75-SET
Software and driver CD-ROM 1
USB-Docking station with extension cable 1
USB-Tilt connector, around 180°turnable 1
SAMBA-USB-KIT*
Y-Cable (for additional current which is required
when GPRS/EDGE data transfer is in progress)
1
* It is not a part of SAMBA 75-SET’s delivery package. Available upon request.
0.3 Used abbreviations
Abbreviation Description
ETSI European Telecommunications Standards Institute
GSM Global System for Mobile communications
IMEI International Mobile station Equipment Identity
ME Mobile Equipment
EDGE Enhanced Data rates for GSM Evolution
GPRS General Packet Radio Service
PLMN Public Land Mobile Network
PIN Personal Identification Number
PUK Personal Unblocking Key
RP Receive Protocol
RXQUAL Received Signal Quality
SIM Subscriber Identity Module
SMS Short Message Service
SMS/PP Short Message Service/Point-to-Point
TA Terminal Adapter
TE Terminal Equipment
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SAMBA 75 USER’S GUIDE VERSION 1.01
Abbreviation Description
TP Transmit Protocol
MS Mobile Station
USB Universal Serial Bus
PTM Point To Multipoint
NOM Network Operation Mode
PPP Point to Point Protocol
CSD Circuit Switched Data
URC Unsolicited Result Code
DNS Domain Name Server
DHCP Dynamic Host Configuration Protocol
APN Access Point Naming
IP Internet Protocol
PDP Packet Data Protocol
RF Radio Frequency
ASIC Application Specific Integrated Circuit
RTC Real Time Clock
Table 1: Used abbreviations
0.4 Related documents
1. ETSI GSM 07.05: “Use of Data Terminal Equipment - Data Circuit terminating
Equipment interface for Short Message Service and Cell Broadcast Service“
2. ETSI GSM 07.07: “AT command set for GSM Mobile Equipment”
3. AT-Command SET
4. PhoneTool installation guide
5. GPRS Startup User's Guide
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SAMBA 75 USER’S GUIDE VERSION 1.01
1 SECURITY
IMPORTANT FOR THE EFFICIENT AND SAFE OPERATION OF YOUR GSM-MODEM, READ
THIS INFORMATION BEFORE USE!
Your cellular engine SAMBA 75 is one of the most exciting and innovative electronic
products ever developed. With it you can stay in contact with your office, your
home, emergency services and others, wherever service is provided.
This chapter contains important information for the safe and reliable use of the
SAMBA 75 modem. Please read this chapter carefully before starting to use the
cellular engine SAMBA 75.
1.1 General information
Your SAMBA 75 device utilizes the GSM standard for cellular technology. GSM is a
newer radio frequency („RF“) technology than the current FM technology that has
been used for radio communications for decades. The GSM standard has been
established for use in the European community and elsewhere. Your SAMBA 75 is
actually a low power radio transmitter and receiver. It sends out and receives radio
frequency energy. When you use your modem, the cellular system handling your
calls controls both the radio frequency and the power level of your cellular modem.
1.2 Exposure to RF energy
There has been some public concern about possible health effects of using a GSM
modem. Although research on health effects from RF energy has focused for many
years on the current RF technology, scientists have begun research regarding newer
radio technologies, such as GSM. After existing research had been reviewed, and
after compliance to all applicable safety standards had been tested, it has been
concluded that the product is fit for use.
If you are concerned about exposure to RF energy there are things you can do to
minimize exposure. Obviously, limiting the duration of your calls will reduce your
exposure to RF energy. In addition, you can reduce RF exposure by operating your
cellular modem efficiently by following the guidelines below.
1.3 Efficient modem operation
In order to operate your modem at the lowest power level, consistent with
satisfactory call quality please take note of the following hints.
 If your modem has an extendible antenna, extend it fully. Some models
allow you to place a call with the antenna retracted. However, your
modem operates more efficiently with the antenna fully extended.
 Do not hold the antenna when the modem is „IN USE“. Holding the
antenna affects call quality and may cause the modem to operate at a
higher power level than needed.
1.4 Antenna care and replacement
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Page 8
Do not use the modem with a damaged antenna. If a damaged antenna comes
into contact with the skin, a minor burn may result. Replace a damaged antenna
immediately. Consult your manual to see if you may change the antenna yourself. If

SAMBA 75 USER’S GUIDE VERSION 1.01
so, use only a manufacturer-approved antenna. Otherwise, have your antenna
repaired by a qualified technician.
Use only the supplied or approved antenna. Unauthorized antennas, modifications
or attachments could damage the modem and may contravene local RF emission
regulations or invalidate type approval.
1.5 Driving
Check the laws and regulations on the use of cellular devices in the area where you
drive. Always obey them. Also, when using your modem while driving, please pay full
attention to driving, pull off the road and park before making or answering a call if
driving conditions so require. When applications are prepared for mobile use they
should fulfil road-safety instructions of the current law!
1.6 Electronic devices
Most electronic equipment, for example in hospitals and motor vehicles is shielded
from RF energy. However, RF energy may affect some malfunctioning or improperly
shielded electronic equipment.
1.7 Vehicle electronic equipment
Check your vehicle manufacturer’s representative to determine if any on board
electronic equipment is adequately shielded from RF energy.
1.8 Medical electronic equipment
Consult the manufacturer of any personal medical devices (such as pacemakers,
hearing aids, etc.) to determine if they are adequately shielded from external RF
energy.
Turn your SAMBA 75 device OFF in health care facilities when any regulations posted
in the area instruct you to do so. Hospitals or health care facilities may be using RF
monitoring equipment.
1.9 Aircraft
Turn your SAMBA 75 OFF before boarding any aircraft.
Use it on the ground only with crew permission.
Do not use it in the air.
To prevent possible interference with aircraft systems, Federal Aviation Administration
(FAA) regulations require you to have permission from a crew member to use your
modem while the plane is on the ground. To prevent interference with cellular
systems, local RF regulations prohibit using your modem whilst airborne.
1.10Children
Do not allow children to play with your SAMBA 75 device. It is not a toy. Children
could hurt themselves or others (by poking themselves or others in the eye with the
antenna, for example). Children could damage the modem or make calls that
increase your modem bills.
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SAMBA 75 USER’S GUIDE VERSION 1.01
1.11Blasting areas
To avoid interfering with blasting operations, turn your unit OFF when in a “blasting
area” or in areas posted: „turn off two-way radio“. Construction crew often uses
remote control RF devices to set off explosives.
1.12Potentially explosive atmospheres
Turn your SAMBA 75 device OFF when in any area with a potentially explosive
atmosphere. It is rare, but your modems or their accessories could generate sparks.
Sparks in such areas could cause an explosion or fire resulting in bodily injury or even
death.
Areas with a potentially explosive atmosphere are often, but not always, clearly
marked. They include fuelling areas such as petrol stations; below decks on boats;
fuel or chemical transfer or storage facilities; and areas where the air contains
chemicals or particles, such as grain, dust or metal powders.
Do not transport or store flammable gas, liquid or explosives, in the compartment of
your vehicle, which contains your modem or accessories.
Before using your modem in a vehicle powered by liquefied petroleum gas (such as
propane or butane) ensure that the vehicle complies with the relevant fire and
safety regulations of the country in which the vehicle is to be used.
1.13Non-ionizing radiation
The antenna is mounted in such a position that no part of the human body will
normally rest close to any part of the antenna. It is also recommended to use the
equipment not close to medical devices as for example hearing aids and
pacemakers.
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SAMBA 75 USER’S GUIDE VERSION 1.01
2 SAFETY STANDARDS
Your GSM mobile complies with all applicable RF safety standards.
The GSM mobile meets the safety standards for RF receivers and the standards and
recommendations for the protection of public exposure to RF electromagnetic
energy established by government bodies and professional organizations, such as
directives of the European Community, Directorate General V in matters of radio
frequency electromagnetic energy.
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SAMBA 75 USER’S GUIDE VERSION 1.01
3 TECHNICAL DATA
3.1 General specifications of SAMBA 75
 Power supply:
 +5 VDC (through USB interface)
 Temperature range:
 Normal operation: -30 °C to +65 °C
 Physical characteristics:
 Size: 88.7mm x 37.6mm x 12,6mm (L x B x H)
 Weight: 79 g
 Firmware upgrade
 SAMBA 75 firmware upgradeable over USB
interface
 Frequency bands:
 Quad-band: GSM 900, GSM 850, DCS 1800 MHz and
PCS 1900 MHz
 Compliant to GSM Phase 2/2+
 GSM class:
 Small MS
 Transmit power:
 Class 4 (2 W) at EGSM 850 and 900
 Class 1 (1 W) at GSM1800 and GSM 1900
 GPRS connectivity:
 GPRS multi-slot class 12
 GPRS mobile station class B
 EDGE connectivity:
 EDGE multi-slot class 10
 EDGE mobile station class B
 DATA:
GPRS ⇒
 GPRS data downlink transfer: max. 85.6 kbps (see
table 2).
 GPRS data uplink transfer: max. 42.8 kbps (see table
2).
 Modulation and Coding Scheme MCS 1 – 4.
 SAMBA 75 supports two protocols PAP (Password
Authentication Protocol) and CHAP (Challenge
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SAMBA 75 USER’S GUIDE VERSION 1.01
Handshake Authentication Protocol) commonly
used for PPP connections.
 Supports of Packet Switched Broadcast Control
Channel (PBCCH) allows you to benefit from
enhanced GPRS performance when offered by the
network operators.
EDGE ⇒
 EDGE data downlink transfer: max. 384 kbps.
 Coding scheme: MCS 1 - 9.
CSD ⇒
 CSD transmission rates: 2.4, 4.8, 9.6, 14.4 kbps, non-
transparent, V.110.
 Unstructured Supplementary Services Data (USSD)
support.
WAP ⇒
 WAP compliant.
 SMS:
 MT, MO, CB, Text and PDU mode
 SMS storage: SIM card plus 25 SMS locations in the
mobile equipment
 Transmission of SMS alternatively over CSD or GPRS.
Preferred mode can be user-defined.
 Audio interfaces:
 None
 Audio features:
 SAMBA 75 does not support voice calls.
 MMS:
 MMS compliant
 FAX:
 Group 3: class 1, class 2
 TCP/IP stack:
 Access by AT Command
 SIM interface:
 Internal SIM interface: 3V only
 Casing:
 Fully shielded
 USB serial link:
 Bi-directional bus for AT commands and data
 Baud rate: 1.2 bps ... 460 kbps
 USB 2.0 Full Speed (12 Mbit/s) slave interface
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SAMBA 75 USER’S GUIDE VERSION 1.01
 Autobauding (on ASC0 only) detects 1200, 2400,
4800, 9600, 19200, 38400, 57600, 115200, 230400 bps
 Phonebook management:
 Supported phonebook types: SM, FD, LD, MC, RC,
ON, ME
 Real time clock:
 Implemented
 Timer function:
 Programmable via AT command
Coding scheme 1 Timeslot 2 Timeslots 4 Timeslots
CS-1: 9.05 kbps 18.1 kbps 36.2 kbps
CS-2: 13.4 kbps 26.8 kbps 53.6 kbps
CS-3: 15.6 kbps 31.2 kbps 62.4 kbps
CS-4: 21.4 kbps 42.8 kbps 85.6 kbps
Table 2: Coding schemes and maximum net data rates over air interface
Please note that the values listed above are the maximum ratings which, in practice,
are influenced by a great variety of factors, primarily, for example, traffic variations
and network coverage.
3.1.1 Power consumption
POWER CONSUMPTION
Typ Unit Description
GSM/GPRS/EDGE engine
Supply voltage 5.0 V
Average supply current
MODE BAND
48 mA IDLE mode GSM 900/850
48 GSM 1800/1900
380 DATA mode, PL 5 GSM 900/850
GSM
240 mA DATA mode, PL 0 GSM 1800/1900
48 GSM 900/850
48 mA IDLE GPRS GSM 1800/1900
450 GSM 900/850
310 mA DATA mode GPRS,
(4 Rx, 1 Tx), Tested (Upload 1 x TX) GSM 1800/1900
660 GSM 900/850
GPRS
420 mA DATA mode GPRS,
(3 Rx, 2 Tx), Tested (Upload 2 x TX) GSM 1800/1900
48 GSM 900/850
48 IDLE EDGE GSM 1800/1900
530 GSM 900/850
320 mA DATA mode EDGE,
(4 Rx, 1 Tx), Tested (Upload 1 x TX) GSM 1800/1900
670 GSM 900/850
EDGE
320 mA DATA mode EDGE,
(3 Rx, 2 Tx), Tested (Upload 2 x TX) GSM 1800/1900
Table 3: Power consumption of GSM/GPRS parts
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SAMBA 75 USER’S GUIDE VERSION 1.01
4 INTERFACES IN OVERVIEW
The integrated modem has a sole USB connector, which gathers all the interface
signals in order to facilitate its integration.
It has an integrated SIM card reader as well as an integral GSM antenna.
The concept of the integrated modem has been defined to integrate on a sole
device with follow interfaces:
Interface specifications
Interface A Standard USB plug serial interface
Interface B 3 optical indicators LED’s
Interface C SIM card reader for small SIM cards (3V) (SIM card is not included in the delivery
package)
Table 6: Interface specifications of the Modem
Figure 1: View of SAMBA 75 interfaces.
4.1.1.1 Interface A (4-pin USB Type A connector)
The power supply for the SAMBA 75 modem has to be a single voltage source of +5
V. If GPRS/EDGE data transfer is in progress, please use the Y-cable, which is
available upon request. The Y-cable provides 3 USB interfaces. Two of them are used
to connect the SAMBA 75 to the host device. While the third USB interface of the Y-
Cable (which has a thinner cable and provides the V+ and GND lines, only) has to
be plugged to a free USB port of the used host device. The third USB interface is
available for additional current (to provide sufficient current in a transmit burst which
typically rises to 600 – 700 mA) when the GPRS/EDGE data transfer is in progress.
Figure 2: Mini-USB pin-out (interface A)
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SAMBA 75 USER’S GUIDE VERSION 1.01
Pin Description
1 + 5V
2 - DATA
3 + DATA
4 GND
Table 7: Pin assignment of the standard USB connector
4.1.1.2 Interface B (Optical interface)
The actual state of the SAMBA 75 is displayed by three LED’s (their functionalities are
described in chapter 4.2) on this interface, see figure below.
Figure 3: Status indicator of modem
4.1.1.3 Interface C (SIM-Card interface)
The SIM interface controls a 3V SIM card. This interface is fully compliant with
GSM 11.11 recommendations concerning SIM functions.
Figure 4: SIM Card interface
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SAMBA 75 USER’S GUIDE VERSION 1.01
4.2 Functional description
The SAMBA 75 GSM/GPRS and EDGE modem is a mobile station for transmission of
data (including digital images, web pages and photographs) and fax calls as well as
SMS in GSM networks.
The SAMBA 75 modem consists of the following components:
• GSM/GPRS transceiver
• USB 2.0 for power supply, data transmission and control.
• GPRS Class B, class 12.
• EDGE Class B, class 10.
The SAMBA 75 allows control of the GSM/GPRS modem over the interface A.
If the GSM/GPRS modem SAMBA 75 is registered in the network, it acts just like a
regular fax/data modem. To control the GSM or GSM/GPRS Modem there is an
advanced set of AT-commands according to GSM ETSI 07.07 and 07.05
implemented.
Three LED’s on the interface B of the Modem display the actual state of the SAMBA.
The table below shows the functions of these LED’s.
LED’s
Name LED mode Function
Off Modem is off or run in SLEEP mode
600 ms On / 600 ms Off No SIM card inserted or no PIN entered, or network search in progress,
or ongoing user authentication, or network login in progress.
75 ms On / 3 s Off Logged to network (monitoring control channels and user interactions).
No call in progress.
75 ms On / 75 ms Off/
75 ms On / 3 ms Off One or more GPRS contexts activated.
Flashing
Flashing Indicates GPRS data transfer: When a GPRS transfer is in
progress, the LED goes on within 1 second after data packets were
exchanged.
Flash duration is approximately 0.5 s.
GSM (LED)
On
On Depending on type of call:
Data call: Connected to remote party or exchange of parameters while
setting up or disconnecting a call.
200 ms On / 200 ms Off USB
100 ms On / 3.2 s Off No SIM card inserted, Modem On, USB On.
Off Modem and USB are OK
ERR (LED)
Continually On USB device initialization or USB device error.
DATA (LED) flashes Indicates incoming/outgoing Modem Data Traffic
Table 8: Modes of the LED’s and associated functions
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SAMBA 75 USER’S GUIDE VERSION 1.01
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 9alternatively 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
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SAMBA 75 USER’S GUIDE VERSION 1.01
not active. The serial interfaces are not accessible. Operating voltage remains
applied.
5.1.3 Alarm mode
Alarm mode restricted operation launched by RTC alert function while the module is
in POWER DOWN mode. Module will not be registered to GSM network. Limited
number of AT commands is accessible.
5.2 Power Up / Power Down Scenarios
In general, be sure not to turn on SAMBA 75 while it is beyond the safety limits of
voltage and temperature. SAMBA 75 would immediately switch off after having
started and detected these inappropriate conditions. In extreme cases this can
cause permanent demage to the module.
5.2.1 Turn on SAMBA 75
SAMBA 75 can be started in a variety of ways as described in the following sections:
• Power up the modem by connecting it to a PC’s USB port (see
section 6.2.1.1)
• Software controlled reset by AT+CFUN command (see section
5.2.1.1)
After startup or mode change the following URCs indicate the module’s ready state:
• “^SYSSTART” indicates that the module has entered Normal mode.
Detailed explanations on AT^SCFG, AT+CFUN, AT+CALA can be found in [3].
5.2.1.1 Reset SAMBA 75 via AT+CFUN Command
To reset and restart the SAMBA 75 use the command AT+CFUN. You can enter
AT+CFUN=,1 or AT+CFUN=x,1, where x may be in the range from 0 to 9. See [3] for
details. If configured to a fix baud rate (AT+IPR≠0), the modem will send the URC
“^SYSSTART” to notify that it is ready to operate. If autobauding is enabled
(AT+IPR=0) there will be no notification. To register to the network SIM PIN
authentication is necessary after restart.
5.2.2 Turn off SAMBA 75
SAMBA 75 can be turned off as follows:
• Normal shutdown: Software controlled by AT^SMSO command
• Automatic shutdown: Takes effect if board temperature is out of
range or if undervoltage or overvoltage conditions occur.
5.2.2.1 Turn off SAMBA 75 Using AT Command
The best and safest approach to powering down SAMBA 75 is to issue the AT^SMSO
command. This procedure lets SAMBA 75 log off from the network and allows the
software to enter into a secure state and safe data before disconnecting the power
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