Altec AL7024S User Manual
AL7020S, AL7024S Designer’s Guide
GSM Socket Modem
AL7020S, AL7020S-3V Series
AL7024S, AL7024S-3V Series
Designer’s Guide
RELEASED 9. JANUARY 2006
Doc. No. DG_7024E Altec Electronic AG Seite 1 / 32
AL7020S, AL7024S Designer’s Guide
Information provided by Altec Electronic AG is believed to be accurate and reliable.
However, no responsibility is assumed by Altec Electronic for its use, nor any
infringement of patents or other rights of third parties which may result from its use.
No license is granted by implication or otherwise under any patent rights of Altec
other than for circuitry embodied in Altec products. Altec Electronic reserves the right
to change circuitry at any time without notice. This document is subject to change
without notice. Please read carefully the safety precautions for a terminal based on
the AL7020S and AL7024S Socket Modems.
Product names or services listed in this publication are for identification purposes
only, and may be trademarks or registered trademarks of their respective companies.
All other marks mentioned herein are the property of their respective owners.
© 2006 Altec Electronic AG
Printed in Switzerland
All Rights Reserved
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AL7020S, AL7024S Designer’s Guide
Table of Contents
1. INTRODUCTION ..........................................................................................................5
1.1 Models Description .......................................................................................................5
1.2 Summary ......................................................................................................................5
1.3 Product Specifications ..................................................................................................6
2. TECHNICAL OVERVIEW.............................................................................................7
2.1 Block Diagramm of GSM Module .................................................................................7
2.2 Supported Interfaces ....................................................................................................7
3. HARDWARE INTERFACE ...........................................................................................8
3.1 Interface Signals...........................................................................................................8
3.2 Signal Description.........................................................................................................8
3.4 Antenna Interface (RF) ...............................................................................................15
3.4.1 RF Connector: ....................................................................................................15
3.4.2 Antenna Performance Recommendations..........................................................16
3.4.3 Antenna Installation ............................................................................................16
3.4.4 User Operation ...................................................................................................16
3.5 Internal SIM Card Interface ........................................................................................17
3.5.1 SIM Card reader pins supported:........................................................................17
3.6 SIM Card Mechanical Drawings .................................................................................18
3.7 External SIM Card Interface (-ES Option) ..................................................................19
3.7.1 External SIM Card reader pins supported: .........................................................19
3.7.2 SIM socket pin description:.................................................................................19
3.7.3 SIM Card Reader Integration:.............................................................................20
3.7.4 Layout Restrictions: ............................................................................................20
3.8 Audio - Interface .........................................................................................................21
3.8.1 Speaker-Circuit ...................................................................................................21
3.8.2 Microphone circuit...............................................................................................22
3.8.3 Audio Circuit Design Considerations ..................................................................22
3.9 Reset Signal (ON/OFF Signal) ...................................................................................23
3.9.1 Software Reset ...................................................................................................23
4. CONNECTORS AND PERIPHERAL REFERENCE...................................................24
4.1 RF CONNECTOR................................................................................................... 24
4.2 Microphone.............................................................................................................24
4.3 Speaker ..................................................................................................................24
4.4 Antenna Cable........................................................................................................24
4.5 GSM antenna .........................................................................................................24
5. DESIGN GUIDELINES ...............................................................................................25
5.1 Electromagnetic Interference (EMI) Considerations...................................................25
5.1.1 Grounding ...........................................................................................................26
5.1.2 Power Supply 5V (5V Models)............................................................................26
5.1.3 Power Supply 3.3V (3V Models).........................................................................27
5.1.4 Preferred Regulators ..........................................................................................27
5.1.5 RF Antenna.........................................................................................................28
5.2 Manufacturing Considerations....................................................................................28
6. MODULE DIMENSIONS ............................................................................................29
7. REGULATORY APPROVALS ....................................................................................30
7.1 Considerations for Regulatory Approvals ...................................................................30
7.1.1 Regulatory Requirements ...................................................................................30
7.1.2 Regulatory Statement .........................................................................................30
7.2 Safety Precautions .....................................................................................................31
7.2.1 User Operation ...................................................................................................31
7.2.2 Antenna Installation ............................................................................................31
7.2.3 Antenna care and replacement...........................................................................31
7.2.4 Electronic devices...............................................................................................31
8. APPENDIX A .............................................................................................................. 32
8.1 REFERENCE DOCUMENTS .................................................................................32
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AL7020S, AL7024S Designer’s Guide
List of Tables & Figures
Table 3-1. Serial TTL Signals...................................................................................................9
Table 3-2. Signal Descriptions ...............................................................................................10
Table 3-3. Signal Descriptions (Cont'd)..................................................................................11
Table 3-3. Signal Descriptions (Cont'd)..................................................................................12
Table 3-4. Analog Electrical Characteristics...........................................................................12
Table 3-5. Digital Electrical Characteristics............................................................................13
Table 3-6. Absolute Maximum Ratings ..................................................................................14
Table 3.7 Antenna Performance Recommendations ............................................................16
Table 3.8. Headset Speaker Output at Maximum Volume Level ...........................................21
FIGURE 2-1. INTERFACE BLOCK DIAGRAM...................................................................................7
IGURE 3-1. SERIAL PINOUT.......................................................................................................9
F
F
IGURE 3-5. SIM CARD READER ..............................................................................................17
F
IGURE 6-2. MECHANICAL DRAWINGS ....................................................................................... 29
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AL7020S, AL7024S Designer’s Guide
11.. IINNTTRROODDUUCCTTIIOONN
1.1 Models Description
Models Operating Bands Interface Connectors Interfaces / Power
AL7020S GSM 900/1800 MHz
AL7020S-3V GSM 900/1800 MHz
AL7020S-ES GSM 900/1800 MHz
AL7024S
AL7024S-3V
GSM 850/900
1800/1900 MHz
GSM 850/900
1800/1900 MHz
• DIL-64 Header (RM2)
• MMCX RF Connector
• DIL-64 Header (RM2)
• MMCX RF Connector
• DIL-64 Header (RM2)
• MMCX RF Connector
• DIL-64 Header (RM2)
• MMCX RF Connector
• DIL-64 Header (RM2)
• MMCX RF Connector
• RS232 TTL Level
• 5 VDC Power
• RS232 TTL Level
• 3.3 VDC Power
• RS232 TTL Level
• SIM Card Interface
• 5 VDC Power
• RS232 TTL Level
• 5 VDC Power
• RS232 TTL Level
• SIM Card Interface
• 5 VDC Power
1.2 Summary
Altec’s AL7020S, AL7024S Socket Modem provides the OEM with a complete E-GSM/GPRS
900/1800Mhz or GSM 850/1900Mhz dual-band module in a compact socket-mountable
module.
The compact size and high level of integration of the Socket Modem minimizes real estate and
cost for motherboard and box modem applications. Its low power consumption makes it ideal
for portable applications such as pocket modems and for a wide variety of embedded control
applications. The pin compatibility between the full range of all ALXXXX Series Socket
Modems and ISDN Socket TA's allows upgrading and production configurability without
hardware changes.
This designer's guide describes the modem hardware. AT commands and S registers are
defined in the AT Command Reference Manual.
As a data modem in CSD mode, the AL7020S and AL7024S Socket Modem can receive data
at speeds up to 14.4 Kbps and can send data at speeds up to 14.4 Kbps. Error correction
V.42 maximize data transfer integrity. Non-error-correcting mode is also supported.
As a fax modem, the AL7020S Socket Modem supports Group 3 send and receive rates up to
14.4 kbps and supports Class I and T.30 protocols.
The Socket Modem with Voice features supports Full Rate, Enhanced Rate and Half Rate
(FR/EFR/HR). This mode supports applications such as digital telephone answering machine
(TAM), voice annotation, audio recording and playback.
The AL7020S Socket Modems supports GPRS Class B and multislot classes up to Class 8
with coding shemes CS1 to CS4. The AL7024S Socket Modems supports GPRS Class B and
multislot classes up to Class 10 with coding schemes CS1 to CS4
SMS services are supported in both GSM and GPRS modes.
The GSM Socket Modems are available with internal and external SIM Card Readers.
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AL7020S, AL7024S Designer’s Guide
1.3 Product Specifications
Product Features
Operating
systems:
Physical Characteristics
Size:
Mounting: Through DIL-64 connectors
Weight:
Operational
temp.
Functional temp. -30°C +70° C
Storage temp. -40°C +85°C
EGSM: 900/1800 MHz
GSM: 850/1900 MHz
64.5 x 26.5 mm Socket
Modem Form Faktor
Environmental
-20°C +60° C
Voice Functions
Telephony
Digital audio
Differential analog audio lines
Vocoders EFR/ER/FR/AMR
DTMF support
Audio control: echo cancellation, noise
suppression, side tone and gain control
GSM Supplementary Services
USSD Phase II
Call forwarding
Call hold, waiting and multiparty
Call diverting
Missed-call indicator
AOC
Call barring
Character Set
Performance
Operating
Voltage:
Current
consumption :
Tx power:
3.3V / 5V
< 2.5 mA @ DRX9 (Idle
mode
• 0.8 W, 850 MHz
• 2 W, 900 MHz
• 1 W, 1800/1900 MHz
Interfaces
Connectors:
SIM Card:
Serial RS232:
• DIL-64 Header (RM2)
• RF MMCX
• Local SIM connectivity
• 32K SIM
• 1.8 / 3.0 V
• BR from 300 bps to 115
Kbps
• Auto BR from 300 bps
to 115 Kbps
Data Features
• Multi-slot class 8 / 10
(4 down; 2 up)
GPRS:
CSD: Max BR 14.4 Kbps
SMS:
• Max BR 85.6 Kbps
• Class B GSM 07.10
multiplexing protocol
• Coding scheme CS1-CS4
• MO/MT Text and PDU
modes
• Cell broadcast
UTF8
UCS2trol/Status Indicators
Control / Status Indicators
GPRS coverage
Wakeup
TX enable
Reset
Features over RS232
Embedded TCP/IP stack
STK Class II
Emergency and Location
FCC E911 Phase II Location Mandate using
EOTD
AT Command Set
GSM 07.05
GSM 07.07
Motorola proprietary AT commands
Accessories
Developer Kit
Antennas
RF Cables
FAX Class 1
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AL7020S, AL7024S Designer’s Guide
22.. TTEECCHHNNIICCAALL OOVVEERRVVIIEEWW
2.1 Block Diagramm of GSM Module
2.2 Supported Interfaces
The major hardware signal interfaces of the DF Series SocketGSM Modem are illustrated
in Figure 1-1.
TTL
Serial
interface
External SIM
(Optional)
• The RS232 Interface is connected via eight pins to the module.
• The SIM card is connected via 4 pins to the module.
• The Microphone is connected via 2 pins to the module.
• The Speaker is connected via one pin to the module.
• The Indicators are connected via two pins to the module.
• The power supply is connected via one pin to the module.
Leds
5
3
3
1
2
Figure 2-1. Interface Block Diagram
Socket
GSM
Modem
Module
1
1
1
Antenna
Interface
Speaker
Microphone
Interface
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AL7020S, AL7024S Designer’s Guide
33.. HHAARRDDWWAARREE IINNTTEERRFFAACCEE
3.1 Interface Signals
The Socket Modem pin assignments with DTE serial TTL interface, SIM Card and Analog
Interface are shown in Figure 3-1 and are listed in Table 3-1.
3.2 Signal Description
The Socket Modem interface signals are described in Table 3-3.
The digital electrical characteristics are listed in Table 3-4.
The analog electrical characteristics are listed in Table 3-5.
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AL7020S, AL7024S Designer’s Guide
A
MIC
RI#
64
63
62
61
Top View
41
40
39
38
37
36
35
34
33
POWER
UDIO
SERIAL TTL
INTERFACE
1
NC
2
NC
SPKR
AGND
VCC
SIM / LED
INTERFACE
24
25
26
27
28
29
30
31
32
RESET#
NC
DGND
LED-GPRS
SIMVCC
GSM LED
SIMDATA
SIMRST
SIMCLK
DGND
DTR#
DCD#
CTS#
DSR#
TXD#
RXD#
RTS#
Notes: Pins 3-23 and 42-60 are not installed.
Figure
3-1. SERIAL PINOUT
Table 3-1. Serial TTL Signals
PI
NAME I/O TYPE PIN NAME I/O TYPE
N
1 NC NC 33 ~RTSTTL Input
2 NC NC 34 ~RXDTTL Output
3 No pin 35 ~TXDTTL Input
4 No pin 36 ~RITTL Output
5 No pin 37 ~DSRTTL Output
6 No pin 38 ~CTSTTL Output
7 No pin 39 ~DCDTTL Output
8 No pin 40 ~DTRTTL Input
9 No pin 41 DGND GND Digital
10 No pin 42 No pin
11 No pin 43 No pin
12 No pin 44 No pin
13 No pin 45 No pin
14 No pin 46 No pin
15 No pin 47 No pin
16 No pin 48 No pin
17 No pin 49 No pin
18 No pin 50 No pin
19 No pin 51 No pin
20 No pin 52 No pin
21 No pin 53 No pin
22 No pin 54 No pin
23 No pin 55 No pin
24 ~RESET Input 56 No pin
25 NC NC 57 No pin
26 DGND GND Digital 58 No pin
27 LED GPRS Output 59 No pin
28 SIMVCC (option) Output 60 No pin
29 LED GSM Output 61 VCC POWER +5V
30 SIMDATA (option) Bi-directional 62 MICV Input
31 SIMRST (option) Output 63 AGND GND Analog
32 SIMCLK (option) Output 64 SPKR Output
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AL7020S, AL7024S Designer’s Guide
Table 3-2. Signal Descriptions
Label
VCC PWR
GND GND Digital Ground Connect to Digital Ground on the interface circuit.
~RESET IC
I/O Type Signal Name/Description
+5 VDC. A standard 5V +/- 5% - 1.5A power supply is strictly required to
supply this module (5V Versions). Average current is 270mA
(350mA @ PCL5). See also chapter 5.1.2
+3.-3 VDC. A standard 3.3V +/- 5% - 1A power supply is strictly required to
supply this module (3V Versions). Average current is 270mA
(350mA @ PCL5). See also chapter 5.1.3
Modem Reset (ON/OFF). To be pulled to ground by external transistor for
reset. (on module pull-up resistor of 200K). The GSM Modem has already an
internal power-up reset circuit. Needs special timing for RESET and ON/OFF
function (see chapter 3.8)
AGND GND
Label I/O Type Signal Name/Description
SIMCLK O
SIMRST O
SIMDATA I/O
SIMVCC PWR
Analog Ground. if a microphone or headset is used, use this as a ground. If
these are never used, it can be connected to DGND.
OPTIONAL SIM CARD READER INTERFACE
SIM Clock. Provided from module.
SIM Reset. Provided from Module to reset the SIM Card.
SIM Data line. Digital, bi-directional data line to exchange data between
module and SIM card.
SIM Power Supply. 3VDC Power Supply provided from module to power
the SIM Card. Only 3V SIM Cards are supported.
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