FALCOM I56 Guide

This document is available at HTTP://WWW.FALCOM.DE/ .
I56/I56i
Hardware description
Preliminary
Version 1.00

I65/I56I HARDWARE DESCRIPTION VERSION 1.00
Contents
0INTRODUCTION ..............................................................5
0.1 GENERAL........................................................................................................................................ 5
0.2 THE DIFFERENCE BETWEEN I56 AND I56I MODULES ....................................................................... 6
0.3 USED ABBREVIATIONS .................................................................................................................... 6
0.4 RELATED DOCUMENTS.................................................................................................................... 9
1SECURITY .......................................................................10
1.1 GENERAL INFORMATION............................................................................................................... 10
1.2 EXPOSURE TO RF ENERGY............................................................................................................ 10
1.3 EFFICIENT MODEM OPERATION ..................................................................................................... 10
1.4 ANTENNA CARE AND REPLACEMENT ............................................................................................ 11
1.5 DRIVING ....................................................................................................................................... 11
1.6 ELECTRONIC DEVICES................................................................................................................... 11
1.7 VEHICLE ELECTRONIC EQUIPMENT ............................................................................................... 11
1.8 MEDICAL ELECTRONIC EQUIPMENT .............................................................................................. 11
1.9 AIRCRAFT..................................................................................................................................... 11
1.10 CHILDREN..................................................................................................................................... 12
1.11 BLASTING AREAS.......................................................................................................................... 12
1.12 POTENTIALLY EXPLOSIVE ATMOSPHERES ..................................................................................... 12
1.13 NON-IONISING RADIATION............................................................................................................ 12
2SAFETY STANDARDS ...................................................13
3TECHNICAL DATA........................................................14
3.1 TECHNICAL SPECIFICATIONS OF GSM/GPRS ENGINE................................................................... 14
3.2 POWER CONSUMPTION FOR I56, ONLY .......................................................................................... 18
3.3 OPERATING TEMPERATURES ......................................................................................................... 18
3.4 AIR INTERFACE OF THE I56 GSM/GPRS ENGINE, ONLY............................................................... 19
4GSM/GPRS APPLICATION INTERFACE..................20
4.1 DESCRIPTION OF OPERATING MODES ............................................................................................ 20
4.1.1 Normal mode operation ............................................................................................................... 20
4.1.2 Power down ................................................................................................................................. 21
4.1.3 Alarm mode ................................................................................................................................. 21
4.1.4 Charge-only mode ....................................................................................................................... 21
4.1.5 Charge mode during normal operation ........................................................................................ 21
5HARDWARE INTERFACES .........................................22
5.1 INTERFACES ON THE I56/I56I........................................................................................................ 22
5.2 DESCRIPTION OF THE 50-PIN DOUBLE-ROW CONNECTOR .............................................................. 23
5.3 DETERMINING THE EXTERNAL EQUIPMENT TYPE......................................................................... 26
5.4 SPECIAL FUNCTIONALITY PINS...................................................................................................... 27
5.4.1 Power supply ............................................................................................................................... 27
5.4.2 Power supply pins (3 and 4) on the board-to-board connector .................................................... 27
5.4.3 Power up/down scenarios ............................................................................................................ 28
5.4.4 Automatic shutdown.................................................................................................................... 31
5.5 AUTOMATIC GPRS MULTISLOT CLASS CHANGE.......................................................................... 34
5.6 GSM CHARGING CONTROL ........................................................................................................... 34
5.6.1 Power-Set-Input........................................................................................................................... 35
5.6.2 Battery pack characteristics ......................................................................................................... 35
5.6.3 Recommended battery pack specification.................................................................................... 37
5.6.4 Implemented charging technique................................................................................................. 37
5.6.5 Operating modes during charging................................................................................................ 38
5.6.6 Charger requirements................................................................................................................... 40
5.6.7 Features supported on the first and second serial interfaces of GSM/GPRS engine.................... 40
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I65/I56I HARDWARE DESCRIPTION VERSION 1.00
5.6.8 SIM interface ............................................................................................................................... 41
5.7 AUDIO INTERFACE ........................................................................................................................ 44
5.7.1 Microphone circuit....................................................................................................................... 44
5.8 CONTROL SIGNALS ....................................................................................................................... 44
5.8.1 Synchronization signal................................................................................................................. 44
5.8.2 Using the GPIO1 pin to control a status LED.............................................................................. 44
5.8.3 Behaviour of the RING_0 line (ASC0 interface)......................................................................... 45
5.9 POWER SAVING............................................................................................................................. 47
5.9.1 No power saving (AT+CFUN=1) ................................................................................................ 47
5.9.2 NON-CYCLIC SLEEP mode (AT+CFUN=0) ............................................................................ 47
5.9.3 CYCLIC SLEEP mode (AT+CFUN=5, 6, 7, 8) .......................................................................... 48
5.9.4 CYCLIC SLEEP mode AT+CFUN=9......................................................................................... 48
5.9.5 Timing of the CTS signal in CYCLIC SLEEP modes................................................................. 49
5.9.6 Wake up I56/I56i from SLEEP mode.......................................................................................... 50
5.10 SUMMARY OF STATE TRANSITIONS (EXCEPT SLEEP MODE)......................................................... 51
5.10.1 Summary of POWER DONE and Normal Mode ........................................................................ 51
5.10.2 Summary of Alarm Mode............................................................................................................ 51
5.10.3 Resetting the GSM module by AT+CFUN=1,1........................................................................... 52
5.11 GSM 07.05 AND 07.07 COMMANDS ............................................................................................. 52
6EMC AND ESD REQUIREMENTS...............................53
7RF EXPOSURES..............................................................54
8FIRST STEPS TO MAKE IT WORKS..........................55
8.1 MINIMUM SET-UP CONNECTION .................................................................................................... 55
8.1.1 Mounting the I56/I56i.................................................................................................................. 55
8.1.2 Antenna interface......................................................................................................................... 55
8.1.3 SIM interface ............................................................................................................................... 56
8.1.4 Serial communication signals ...................................................................................................... 56
8.1.5 Power supply ............................................................................................................................... 57
8.1.6 Turn on the GSM/GPRS engine of I56/I56i ................................................................................ 58
9HOUSING .........................................................................59
10 CONNECTOR SUPPLIER AND PERIPHERAL
DEVICES ..........................................................................60
10.1 50-PIN CONNECTOR ...................................................................................................................... 60
10.2 GSM ANTENNA............................................................................................................................ 60
10.3 THE SIM CARD HOLDER ............................................................................................................... 61
11 GSM EVALUATION KIT (GSM EVAL-KIT) .............62
Version history
Version number Author Changes
1.00 Fadil Beqiri Initial version
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I65/I56I HARDWARE DESCRIPTION VERSION 1.00
Cautions
Information furnished herein by FALCOM is believed to be accurate
and reliable. However, no responsibility is assumed for its use. Also
the information contained herein is subject to change without notice.
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 is
available at the following internet address: http://www.falcom.de/
Trademarks
Some mentioned products are registered trademarks of their respective
companies.
Copyright
The I56/I56i hardware description 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.
This confidential document is the property of FALCOM GmbH and may not be copied or circulated without permission.
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I65/I56I HARDWARE DESCRIPTION VERSION 1.00
0 Introduction
0.1 General
The I56/I56i is designed for use on any GSM network in the world. The
I56/I56i is a tri band GSM/GPRS engine that works on three frequencies
GSM 850 MHz, DCS 1800 MHz and PCS 1900 MHz.
This full type approved integrated modem constitutes a self contained, fully
integrated implementation of the GSM/GPRS. I56/I56i features GPRS class
B, class 10 (making download at speeds up to 85 kbps) and supports the
GPRS coding schemes CS-1, CS-2, CS-3 and CS-4.
The I56/I56i module incorporates all you need to create high-performance
GSM/GPRS solutions; base band processor, power supply ASIC, complete
radio frequency circuit including a power amplifier, internal and external
SIM interfaces and an antenna interface as well.
The physical interface to the cellular application is made through a board-to-
board connector. It consists of 50 pins, required for controlling the unit,
transferring data and audio signals and providing power supply lines.
The external dual band or triple band antenna can directly be connected to
the integrated 50 connector on the side of module.
The I56/I56i is a mobile station for transmission of voice, data calls and
FAX as well as short messages (SMS - Short Message Service) in GSM
Network.
For battery powered applications, I56/I56i features a charging control which
can be used to charge a Li-Ion battery. The charging circuit must be
implemented external the module on your application platform.
To control the GSM module there is an advanced set of AT commands
according to GSM ETSI (European Telecommunications Standards
Institute) 07.07 and 07.05 implemented.
Figure 1: Views (front and back side) of I56/I56i
Users are advised to proceed quickly to the „Security“ chapter and read the
hints carefully.
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I65/I56I HARDWARE DESCRIPTION VERSION 1.00
0.2 The difference between I56 and I56i modules
I56 The I56 is a Tri-band device which operates in three frequencies
GSM 850 MHz, DCS 1800 MHz and PCS 1900 MHz, and is
available to use in the American Networks. However, the I56
module contains 1800 MHz GSM functions that is not operational
(must not be used) in U.S. Territories. This filing is only applicable
for 850MHz GSM/1900 MHz PCS operations, whereby only these
frequencies (850MHz GSM/1900 MHz PCS) are possible to be used
in U.S. Territories.
I56i The I56i is also a Tri-band device which operates on three
frequencies GSM 850 MHz, DCS 1800 MHz and PCS 1900 MHz,
and is available to use in the American Networks. However, the I56i
module contains 1800 MHz GSM functions that is not operational
(must not be used) in U.S. Territories. This filing is only applicable
for 850MHz GSM/1900 MHz PCS operations, whereby only these
frequencies (850MHz GSM/1900 MHz PCS) are possible to be used
in U.S. Territories. The I56i provides a specific soft- and hardware
(internal TCP/IP stack software with hardware extension) which has
been internally implemented for using the embedded TCP/IP stack
software. The I56i module comes without modification regarding to
the 50-pin board-to-board connector.
The integration of TCP/IP stack with hardware extension (a
TCP/IP-module added) into the equipment converts it to a stand-
alone client that can be connected to the internet through any GSM
850/1800/1900 network. The module can also send and receive data
by GSM and GPRS network using TCP/IP stack. It supports SMS,
DATA and FAX calls. The I56i module can be easily controlled by
using AT or TCP commands. The “TCP Command Set” manual is
also issued as separate document and is available on the distributed
CD for the I56i’s users.
Please note that, according to your requirement you can choose the desired
device.
0.3 Used abbreviations
Abbreviation Description
AD Analogue/Digital
ADC Analogue-to-Digital Converter
AFC Automatic Frequency Control
AGC Automatic Gain Control
AMP Advanced Power Management
ANSI American National Standards Institute
ARFCN Absolute Radio Frequency Channel Number
ARP Antenna Reference Point
ASC0 Asynchronous Controller. Abbreviations used for serial interface of
I56/I56i
ASIC Application Specific Integrated Circuit
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I65/I56I HARDWARE DESCRIPTION VERSION 1.00
Abbreviation Description
B2B Board-to-board connector
BER Bit Error Rate
BTS Base Transceiver Station
CB or CBM Cell Broadcast Message
CE Conformité Européene (European Conformity)
CHAP Challenge Handshake Authentication Protocol
CPU Central Processing Unit
CS Coding Scheme
CSD Circuit Switched Data
CTS Clear to Send
DAC Digital-to-Analogue Converter
dBW Decibel per Watt
dBm0 Digital level, 3.14 dBm0 corresponds to full scale, see ITU G.711,
A-law
DCE Data Communication Equipment
DRX Discontinuous Reception
DSP Digital Signal Processor
DSR Data Set Ready
DTE Data Terminal Equipment (typically computer, terminal, printer or,
for example, GSM application)
DTR Data Terminal Ready
DTX Discontinuous Transmission
EFR Enhanced Full Rate
EGSM Enhanced GSM
EMC Electromagnetic Compatibility
ESD Electrostatic Discharge
ETS European Telecommunication Standard
FCC Federal Communications Commission (U.S.)
FDMA Frequency Division Multiple Access
FR Full Rate
GMSK Gaussian Minimum Shift Keying
GPRS General Packet Radio Service
GSM Global Standard for Mobile Communications
HiZ High Impedance
HR Half Rate
I/O Input/Output
IC Integrated Circuit
IF Intermediate Frequency
IMEI International Mobile Equipment Identity
ISO International Standards Organization
ITU International Telecommunications Union
kbps kbits per second
LED Light Emitting Diode
LNA Low Noise Amplifier
Mbps Mbits per second
MMI Man Machine Interface
MO Mobile Originated
MS Mobile Station (GSM engine), also referred to as TE
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I65/I56I HARDWARE DESCRIPTION VERSION 1.00
Abbreviation Description
MSISDN Mobile Station International ISDN number
MSK Minimum Shift Key
MT Mobile Terminated
NC Not Connected
PA Power Amplifier
PAP Password Authentication Protocol
PBCCH Packet Switched Broadcast Control Channel
PCB Printed Circuit Board
PCL Power Control Level
PCM Pulse Code Modulation
PCN Personal Communications Network, also referred to as DCS 1800
PCS Personal Communication System, also referred to as GSM 1900
PDU Protocol Data Unit
PLL Phase Locked Loop
PPP Point-to-point protocol
PSU Power Supply Unit
R&TTE Radio and Telecommunication Terminal Equipment
RAM Random Access Memory
RF Radio Frequency
RMS Root Mean Square (value)
ROM Read-only Memory
RP Receive Protocol
RTC Real Time Clock
Rx Receive Direction
SAR Specific Absorption Rate
SELV Safety Extra Low Voltage
SIM Subscriber Identification Module
SMS Short Message Service
SRAM Static Random Access Memory
TA Terminal adapter (e.g. GSM engine)
TDMA Time Division Multiple Access
TE Terminal Equipment, also referred to as DTE
Tx Transmit Direction
UART Universal asynchronous receiver-transmitter
URC Unsolicited Result Code
USSD Unstructured Supplementary Service Data
VSWR Voltage Standing Wave Ratio
WAAS Wide Area Augmentation System
FD SIM fix dialing phonebook
LD SIM last dialing phonebook (list of numbers most recently dialed)
MC Mobile Equipment list of unanswered MT calls (missed calls)
ME Mobile Equipment phonebook
ON Own numbers (MSISDNs) stored on SIM or ME
RC Mobile Equipment list of received calls
SM SIM phonebook
Table 1: Used abbreviations
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I65/I56I HARDWARE DESCRIPTION VERSION 1.00
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. ITU-T V.25ter “Serial asynchronous automatic dialling and control”
4. I56/I56i AT Command Set
5. gprs_startup_user_guide_rev_1.00_preliminary
6. I56i TCP Command Set
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I65/I56I HARDWARE DESCRIPTION VERSION 1.00
1 Security
IMPORTANT FOR THE EFFICIENT AND SAFE OPERATION OF
YOUR GSM MODEM, READ THIS INFORMATION BEFORE USE!
Your cellular engine I56/I56i 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 I56/I56i. Please read this chapter carefully before starting to use the
cellular engine I56/I56i.
1.1 General information
Your I56/I56i modem utilises 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 modem 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
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 minimise 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.
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I65/I56I HARDWARE DESCRIPTION VERSION 1.00
1.4 Antenna care and replacement
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 so, use only a manufacturer-approved
antenna. Otherwise, have your antenna repaired by a qualified technician.
Use only the supplied or approved antenna. Unauthorised 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 I56/I56i modem 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 I56/I56i 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.
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I65/I56I HARDWARE DESCRIPTION VERSION 1.00
1.10 Children
Do not allow children to play with your I56/I56i modem. 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.
1.11 Blasting 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 use remote control RF devices to set off explosives.
1.12 Potentially explosive atmospheres
Turn your I56/I56i modem OFF when in any area with a potentially
explosive atmosphere. It is rare, but your modem or its 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.
1.13 Non-ionising radiation
As with other mobile radio transmitting equipment users are advised that for
satisfactory operation and for the safety of personnel, it is recommended that
no part of the human body be allowed to come too close to the antenna
during operation of the equipment.
The radio equipment shall be connected to the antenna via a non-radiating
50 Ohm coaxial cable.
The antenna shall be 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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I65/I56I HARDWARE DESCRIPTION VERSION 1.00
2 Safety standards
This GSM modem complies with all applicable RF safety standards.
The embedded GMS modem 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 organisations, such as directives of the European
Community, Directorate General V in matters of radio frequency
electromagnetic energy.
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I65/I56I HARDWARE DESCRIPTION VERSION 1.00
3 Technical data
3.1 Technical specifications of GSM/GPRS engine
 Power supply:
 Supply voltage +5 V DC ±10 % (see chapter 3.2
for further details)
 Power saving (GSM):
 Minimizes power consumption in SLEEP mode
to 13 mA
 Charging:
 Supports charging control for Li-Ion battery for
the GSM/GPRS engine of the module
 Temperature range:
 Normal operation: -20 °C to +55 °C (see chapter
3.3 for further details)
 Evaluation kit:
 The I56/I56i Evaluation Kit is designed to test
consider it as a Reference-Design for your HW-
application, thus, you can save time and money.
In this way you can reduce the Time-To-Market
(see chapter 11).
 Physical characteristics:
 Size: 60.1 ± 0.15 mm x 40.0 ± 0.15 mm x 9.4 ±
0.15 mm (for more details see chapter 5.
Housing)
 Weight: 40 ±2 g
 I56i firmware upgrade:
 I56i firmware upgradeable over serial interface
 Frequency bands:
 Tri-band: GSM 850, GSM 1800, GSM 1900
 Compliant to GSM Phase 2/2+
 GSM class:
 Small MS
 Transmit power:
 Class 4 (2 W) at GSM850
 Class 1 (1 W) at GSM 1800 and GSM 1900
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I65/I56I HARDWARE DESCRIPTION VERSION 1.00
 GPRS connectivity:
 GPRS multi-slot class 10
 GPRS mobile station class B
 DATA:
GPRS ⇒
 GPRS data downlink transfer: max. 85.6 kbps
(see table 3).
 GPRS data uplink transfer: max. 42.8 kbps (see
table 3).
 Coding scheme: CS-1, CS-2, CS-3 and CS-4.
 I56/I56i supports the two protocols PAP
(Password Authentication Protocol) and CHAP
(Challenge Handshake Authentication Protocol)
commonly used for PPP connections.
 Support of Packet Switched Broadcast Control
Channel (PBCCH) allows you to benefit from
enhanced GPRS performance when offered by
the network operators.
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.
 MMS:
 MMS compliant
 FAX:
 Group 3: class 1, class 2
 SIM interface:
 Supported SIM card: 3 V
 Integrated SIM card slot (for small SIM card,
only)
 External SIM interface, which can be connected
via provided pins on the 40-pin board-to-board
connector (note that extra card reader is not part
of I56/I56i)
 Casing:
 Fully shield
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I65/I56I HARDWARE DESCRIPTION VERSION 1.00
 Temperature control
and auto switch-off:
 Constant temperature control prevents damage to
I56/I56i when the specified temperature is
exceeded. When an emergency call is in progress
the automatic temperature shutdown
functionality is deactivated. (see chapter 3.3 for
further details)
 External antenna:
 Connected via 50 Ohm antenna connector.
 Audio interfaces:
 An analogue audio interface
 Audio features:
Speech code modes:
 Half Rate (ETS 06.20)
 Full Rate (ETS 06.10)
 Enhanced Full Rate (ETS 06.50/06.60/06.80)
 Adaptive Multi Rate (AMR)
Handsfree operation
 Echo cancellation
 Noise reduction
 One serial interface (ASC0):
 2.65V level, bi-directional bus for AT
commands and data
 ASC0full-featured 8-wire serial interface.
Supports RTS0/CTS0 hardware handshake and
software XON/XOFF flow control. Multiplex
ability according to GSM 07.10 Multiplexer
Protocol.
 Baud rate: 300 bps ... 230 kbps on ASC0
 Autobauding detects 1200, 2400, 4800, 9600,
19200, 38400, 57600, 115200, 230400 bps
 Phonebook management:
 Supported phonebook types: SM, FD, LD, MC,
RC, ON, ME
 SIM Application Toolkit:
 Supports SAT class 3, GSM 11.14 Release 98
 Ringing tones:
 Offers a choice of 7 different ringing
tones/melodies, easily selectable with AT
command
 Real time clock:
 Implemented
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I65/I56I HARDWARE DESCRIPTION VERSION 1.00
 Timer function:
 Programmable via AT command
 Support of TTY/CTM:
 To benefit from TTY communication via GSM,
CTM equipment can be connected to one of the
three audio interfaces.
 Internal memory for I56i, only:
 Combo-Memory (2 MB Flash–512 KB SRAM)
 Software for I56i, only:
 TCP/IP stack (Internet protocols stack which
handles the Internet's link, network, transport
and application layers). The embedded software
interface that runs on I56i module for
establishing an internet connectivity using IP
commands. TCP/IP software description is also
available.
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.
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I65/I56I HARDWARE DESCRIPTION VERSION 1.00
3.2 Power consumption for I56, only
POWER CONSUMPTION
Min Typ. Max Unit Description
GSM/GPRS engine
Supply voltage 4.7 5 5.2 V
Voltage must stay within the min/max
values, including voltage drop, ripple
and spikes.
Average supply current
50 100 µA POWER DOWN mode
9 mA SLEEP mode @ DRX = 6
MODE BAND (I56/I56I)
15 GSM 850
15 mA IDLE mode GSM 1800/1900
250 GSM 850*)
GSM
170 mA TALK mode GSM 1800/1900**)
15 GSM 850
15 mA IDLE GPRS GSM 1800/1900
290 GSM 850*)
220 mA DATA mode GPRS,
(4 Rx, 1 Tx) GSM 1800/1900**)
440 GSM 850*)
GPRS
310 mA DATA mode GPRS,
(3 Rx, 2 Tx) GSM 1800/1900**)
Peak supply
current. 1.6 A Power control level During transmission slot every 4.6 ms.
Table 3: Power supply
*) Power Control Level (PCL 5).
**) Power Control Level (PCL 0).
3.3 Operating temperatures
Parameter Min Typ. Max Unit
Ambient temperature (according to GSM
11.10)
-20 25 50 °C
Restricted operation *) -25 to -20 55 to 70 °C
Automatic shutdown
I56/I56i board temperature -29 °C >70 °C
Table 4: Operating temperature
*) I56/I56i works, but deviations from the GSM specification may occur.
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I65/I56I HARDWARE DESCRIPTION VERSION 1.00
3.4 Air interface of the I56 GSM/GPRS engine, only
Test conditions:
All measurements have been performed at Tamb = 25 °C, VVC5 typ. = 5 V.
Parameter Min Typ. Max Unit
GSM 850 824 849 MHzFrequency range
Uplink (MS BTS) GSM 1800 1710 1785 MHz
GSM 1900 1850 1910 MHz
GSM 850 869 894 MHz
Frequency range
Downlink (BTS MS) GSM 1800 1805 1880 MHz
GSM 1900 1930 1990 MHz
GSM 850 31 33 35 dBm
GSM 1800 28 30 32 dBm
RF power @ ARP with 50 
load GSM 1900 28 30 32 dBm
GSM 850 124
GSM 1800 374
Number of carriers
GSM 1900 299 dBm
GSM 850 45 MHz
GSM 1800 95 MHz
Duplex spacing
GSM 1900 80 MHz
Carrier spacing 200 kHz
Multiplex, Duplex TDMA/FTDMA, FDD
Time slots per TDMA frame 8
Frame duration 4.615 ms
Time slot duration 577 µs
GMSK
GSM 850 -102 -107 dBm
GSM 1800 -102 -106 dBm
Modulation
Receiver input sensitivity @
ARP
BER Class II < 2.4 % GSM 1900 -102 -105.5 dBm
Table 5: Air Interface
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Page 19

I65/I56I HARDWARE DESCRIPTION VERSION 1.00
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 9alternatively 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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Page 20