Trimble 80350000A GSM/GPRS Modem Module User Manual 80350 Module rev1

Trimble Navigation Ltd GSM/GPRS Modem Module 80350 Module rev1

User manual

  80350 Module Integration Guide  11/10/2008    Confidential  Page 1 of 53           The 80350 Module Integration Guide  Version 0.02           Cros Fan  Bing Xu  Chester Liu  Prepared by:  Dong-Ming Xia  Brian Pan  Yan-Jing Ji  Checked by: Zheng-Bo Han  Approved by:
  80350 Module Integration Guide  11/10/2008    Confidential  Page 2 of 53  Contents  SAFETY INFORMATION................................................................................................................................................4 OVERVIEW........................................................................................................................................................................5 DOCUMENT HISTORY ...................................................................................................................................................5 REGULATORY COMPLIANCE FCC............................................................................................................................6 INTEGRATION CONSIDERATIONS AND INSTALLATION REQUIREMENTS ............................................................................6 DISCLAIMER ......................................................................................................................................................................6 1. INTRODUCTION.......................................................................................................................................................6 1.1 PRODUCT OVERVIEW............................................................................................................................................6 1.2 KEY FEATURES .....................................................................................................................................................6 1.3 PROVIDING MULTI-BAND OPERATION ..................................................................................................................6 1.4 SUMMARY OF FEATURES ......................................................................................................................................6 1.5 GENERAL DESIGN GUIDELINES ............................................................................................................................6 1.5.1 Advanced tips for an RF friendly layout ..................................................................................................6 1.5.2 Audio Reference Design ...........................................................................................................................6 2. TECHNICAL SPECIFICATION..............................................................................................................................6 2.1 BLOCK DIAGRAM ...................................................................................................................................................6 2.2 HARDWARE KEY PARTS........................................................................................................................................6 2.3 ABSOLUTE MAXIMUM RATINGS.............................................................................................................................6 3. PHYSICAL INTERFACES .......................................................................................................................................6 3.1 MODULE MOUNTING TO HOST BOARD (REFERENCE)..........................................................................................6 3.2 CONNECTORS .......................................................................................................................................................6 3.3 RF CONNECTION...................................................................................................................................................6 3.3.1 Coaxial Connector Option.........................................................................................................................6 3.3.2 Note:  The above information regarding the connector and mating connector are taken from the pertinent manufacturer specifications; for more details, please refer to the specifications of the part manufacturer.I/O Connector Pin Assignment ...........................................................................................................................................6 3.3.2 I/O Connector Pin Assignment.....................................................................................................................6 3.4 ANTENNA...............................................................................................................................................................6 3.5 CONTROL CONNECTOR SIGNAL DESCRIPTIONS AND FUNCTIONS .......................................................................6 3.5.1 Module Power (Pins 41, 42, 43, 44 & 45)...............................................................................................6 3.5.2 Reset Signal (Pin 55).................................................................................................................................6 3.5.3 Power Control (pin 56)...............................................................................................................................6 3.5.4 SIM Interface (pins 16, 17,18 &19)..........................................................................................................6 3.5.5 PCM Interface (pins 23, 24, 25 & 26)......................................................................................................6 3.5.6 Auxiliary Audio Interface............................................................................................................................6 3.5.7 Serial Interface UART0..............................................................................................................................6 3.5.8 Debug communication(Pins 10, 31).........................................................................................................6 4. GSM/GPRS SERVICES.............................................................................................................................................6 4.1 TRANSMISSION MODES FOR THE GSM/GPRS SERVICES ..................................................................................6 4.2 VOICE COMMUNICATION .......................................................................................................................................6 4.3 CIRCUIT-SWITCHED DATA ....................................................................................................................................6 4.4 SHORT MESSAGE SERVICES(SMS).....................................................................................................................6 5. SIM OPERATION......................................................................................................................................................6 5.1 PROVISIONING THE SIM........................................................................................................................................6 5.2 GSM SUPPORTED SERVICES...............................................................................................................................6 5.3 GPRS SUPPORTED SERVICES.............................................................................................................................6
  80350 Module Integration Guide  11/10/2008    Confidential  Page 3 of 53 5.4 GSM MODES OF OPERATION...............................................................................................................................6 6. SOFTWARE INTERFACE .......................................................................................................................................6 6.1 API INTERFACE .....................................................................................................................................................6 6.2 AT COMMAND SET................................................................................................................................................6 7. SETUP AND INITIALIZATION..............................................................................................................................6 7.1 INITIALIZATION......................................................................................................................................................6 7.1.1 Start HyperTerminal...................................................................................................................................6 7.1.2 Initialization Command ..............................................................................................................................6 7.2 SEND SMS EXAMPLE ...........................................................................................................................................6 7.3 VOICE CALL EXAMPLE ..........................................................................................................................................6 7.3.1 MO ................................................................................................................................................................6 7.3.2 MT.................................................................................................................................................................6 7.4 GPRS PACKET EXAMPLES...................................................................................................................................6 REFERENCES....................................................................................................................................................................6 ABBREVIATION ...............................................................................................................................................................6
  80350 Module Integration Guide  11/10/2008    Confidential  Page 4 of 53  Safety Precautions  Before you use the 80350 module, please carefully read this section to understand the correct method of use and ensure the safety of the holder, others and properties.  z  Do not expose the 80350 module to open flames.  z  Ensure that liquids do not spill onto the 80350 module.  z  Do not use the 80350 module in an environment of extremely high or low temperature, otherwise, malfunctions may be caused.   z  Using the 80350 module in an environment of moist or high humidity may cause malfunctions of the product.  z  Do not drop or strongly impact the 80350 module; otherwise, malfunctions may be caused and the product cannot be used.  z  Do not use the 80350 module near any electronic device vulnerable to interference. Otherwise, malfunctions of electronic device may result. Such electronic devices include medical electronic devices, such as hearing aids and pacemaker, fire alarms, auto doors and other automatic equipment. If you have to use the 80350 module near such devices, please first consult the manufacturers and dealers of these devices to avoid interference.  z  Do not dispose the 80350 module as urban waste. For details, please refer to the local regulations for proper disposal of waste electronics.   z  Do not attempt to disassemble the 80350 module; doing so will void the warranty. With the exception of the Subscriber Identification Module (SIM), this product does not contain consumer-serviceable components.  z  The specifications of this product are subject to change due to improvement of its functionality without notice.
  80350 Module Integration Guide  11/10/2008    Confidential  Page 5 of 53 Overview This document is intended to offer the application developer a reference to the 80350 module’s hardware and software specifications and interfaces.  Document History  Version  Date  Author  Comments 0.00 09/05/2008  PPD  Draft 0.01  10/29/2008  PPD  Revised per TNL’s comments and other comments 0.02  11/25/2008  PPD  FCC/IC/CE compliance declaration wording revised
  80350 Module Integration Guide  11/10/2008    Confidential  Page 6 of 53 Regulatory Compliance Declaration of Conformity This device meets the FCC Radiofrequency Emission Guidelines and is certified with the FCC as: Model number: 80350 FCC ID number:  JUP80350000A. Industry Canada ID number: 1756A-8035000A Identification mark: 1588 (Notified Body) CE.  Person responsible for making this declaration: Brian Jackson, Trimble Navigation Ltd., 935 Steward Dr., Sunnyvale, CA 94085, USA. Compliance with CE Rules and Regulations  For compliance purposes, the label must show the CE Mark and Notified Body number. The product must be correctly installed in order to maintain compliance.. The RF safety has been based on an MPE calculation; therefore, the device must be used at more than 20 cm (or 7.9 in.) from the body. Also, the compliance of the host product (containing the module) is the responsibility of the integrator who puts the host product on the market, and further testing may be required, with this module installed in the host device. Compliance with FCC/IC Rules and Regulations This device complies with part 15 of the FCC Rules. Operation is subject to the condition that this device does not cause harmful interference, and that this device must accept any interference received, including interference that may cause undesired operation.   Caution Changes or modifications not expressly approved by the manufacturer could void the user’s authority to operate the equipment.  When incorporating the 80350 module in a host product, the integrator must ensure that the host product comply with relevant FCC requirements and regulations.   For mobile or fixed applications (with the device at least 20 cm or 7.9 in. distance from the body), the integrator is authorized to use the FCC/IC Grants and Certificates of this module for their host product if the module is integrated and installed in accordance with the conditions under which the module has been tested and certified. In this case the FCC label of the module shall be visible from the outside, or the host product shall bear a label making reference to the module inside (the label should state “Contains FCC ID JUP80350000A” or something to the effect). FCC RF safety regulations require a warning label prompting the user to keep the antenna of a device in operation at least 20 cm or 7.9 in. distance from the body.
  80350 Module Integration Guide  11/10/2008    Confidential  Page 7 of 53 Important For portable applications (with the device less than 20 cm or 7.9 in. distance from the body), the integrator are required to have their host product certified to obtain its own FCC/IC Grants and Certificates. This is mandatory to meet the SAR requirements for portable wireless devices. See www.fcc.gov/oet/rfsafety for more information on RF exposure safety and product labeling requirements. Disclaimer The 80350 module and the information and statement in this document, at the time of its publication, are in compliance with FCC, PTCRB, IC and CE rules and regulations. Liability from any usage that violates these rules and regulations is the sole responsibility of the user.  It is strongly recommended that the installation and tuning of the 80350 module be only undertaken by RF specialists with adequate experience and credentials. The reference design and suggested methods for installing and tuning the module shall not be deemed applicable under all possible environments and conditions of application; the manufacturer shall not be held liable for incorrect parameters or measurements as a result of egression from the range of environments and conditions considered by the manufacturer.  The manufacturer shall not be held responsible for bodily injuries or property damages as a result of installing and using the 80350 module.
  80350 Module Integration Guide  11/10/2008    Confidential  Page 8 of 53 1. Introduction 1.1 Product Overview The 80350 module is a highly integrated GSM/GPRS module, which has built-in support for RF, voice, power management, among other functionalities, and is in compliance with GSM/GPRS wireless communication standards.  1.2 Key Features The following table summarizes the main features of the 80350 module. Data input/output interface  80-pin connector Primary serial port  full 9-pin, UART implementation PCM Port  Only support salve (only for Audio PCM) Voice  Support 2 Audio In and 2 Audio out Antenna Interface  Ultra-miniature coaxial connector Command protocol  GSM AT command set (80350 GSM/GPRS Modem Module AT Command Specification) Interface Subscriber Identification Module (SIM)  Optional 1.8/3 V mini-SIM carrier and interface on-board with SIM detect Electrical power  3.55V to 4.2V (VBATT) Power Peak currents and average power dissipation  Refer to the Operating Power table in the summary of features for peak currents and average power dissipation for various modes of operation.  Frequency bands  EGSM 900, GSM1800, GSM 850 and GSM 1900 capability. Radio Features  GSM/GPRS features supported  Provides for all GSM/GPRS authentication, encryption, and frequency hopping algorithms. GPRS Coding Schemes CS1-CS4 supported. Multi-Slot Class 10 (4RX/2TX, Max 5 Slots)  Regulatory  Agency approvals  • GCF Type Approval  • PTCRB Type Approval  • FCC Certification • CE (Conformité Européenne)  • IC (Industry Canada) Approval
  80350 Module Integration Guide  11/10/2008    Confidential  Page 9 of 53  GSM/GPRS Functionality  • Mobile-originated and mobile-terminated SMS messages: up to 140 bytes or up to 160 GSM 7-bit ASCII characters. • Reception of Cell Broadcast Messages  • SMS Receipt acknowledgement  • Circuit Switched Data (Transparent & Non-transparent up to 9.6 Kbps)  • Voice (EFR, FR, HR, and AMR)  • Supports Unstructured Supplementary Service Data (USSD)  • Multi-Slot Class 10 Supported (4Rx/2TX, 5 Slot Max)  • PBCCH/PCCCH supported  Audio Features  • Microphone biasing  • 2 Analog Audio Input  • 2 Analog Audio Output SIM  1.8/3 V Mini-Subscriber Identity Module (SIM) compatible  1.3  Providing Multi-Band Operation The 80350 module supports quad-band GSM operation: 850/900/1800/1900MHz.  1.4  Summary of Features  Mechanical: Dimensions 45.7 mm x 34.1 mm x 3.5 mm (not including mounting tabs) Weight 8.1 g  Packet Data Transfer: Protocol  GPRS Release 97 Coding Schemes CS1-CS4 Multi-Slot Capability: (Demonstrated @MS10) MS10 (4RX/2TX, Max 5 Slots) Packet Channel Support PBCCH/PCCCH  Circuit Switched Data Transfer: V110  300 bps/1200 bps/2400 bps/4800 bps/9600 bps/14,400 bps Non-Transparent 300 bps/1200 bps/2400 bps/4800 bps/9600 bps/14,400 bps  Short Message Services: GSM SMS  MO, MT, CB, Text and PDU Modes GPRS SMS MO, MT, CB, Text and PDU Mode  Voice Capability: Speech Codec  EFR, FR, HR, and AMR  GSM/GPRS Radio Performance Multi-Band: Radio Frequencies  850 MHz, 900 MHz, 1800 MHz and 1900 MHz Sensitivity <-102 dBm (Typical GPRS CS1) 850 & 900 MHz Transmit Power Class 4 (2 W) 1800 & 1900 MHz Transmit Power Class 1 (1 W)  System Requirements: Host Interface Serial Interface DC Voltage 3.55 to 4.2 V
  80350 Module Integration Guide  11/10/2008    Confidential  Page 10 of 53  Application Interface: Host Protocol AT Commands Internal Protocols UDP stack, TCP/IP stack, PPP, PAD and CMUX Physical Interface 1 serial (primary) and  I2C Audio Interface • Microphone biasing • 2 Analog Audio Input • 2 Analog Audio Output  SIM Interface: Remote SIM Option  1.8/3-Volt SIM Capability  Environmental:   Compliant Operating Temp -20 °C to 60 °C (Fully GSM Spec Compliant) Operating Temperature -20 °C to 70 °C Storage Temperature -40 °C to 85 °C Humidity 5 to 95% non-condensing  EMC: Emissions  FCC Parts 15 Class B & 22 & 24, IC & CE  Operating Power (Typical): GSM Operation GSM 850/900 (1 RX/1 TX, full power) 66 mA min, 221 mA average, 1.23 A peak GSM 1800 (1 RX/1 TX, full power) 59 mA min,170 mA average, 775 mA peak GSM 1900 (1 RX/1 TX, full power) 58 mA min,161 mA average, 711mA peak Idle <5 mA Average Shutdown <1mA  GPRS Operation Power EGSM 850/900 (4 RX/1 TX, full power) 146 mA min, 247 mA average, 1.28 A peak EGSM 850/900 (2 RX/2 TX, full power) 71 mA min, 370 mA average, 1.28 A peak GSM 1800 (4 RX/1 TX, full power) 159mA min, 193 mA average, 796 mA peak GSM 1800 (2 RX/2 TX, full power) 112 mA min, 259 mA average,786 mA peak GSM 1900 (4 RX/1 TX, full power) 154 mA min, 185 mA average, 751mA peak GSM 1900 (2 RX/2 TX, full power)  60 mA min, 246 mA average, 736mA peak Idle  <5 mA average Shutdown <1mA  GSM Transmit Power: 1800/1900 MHz  GSM Power Class 1 (30 dBm ± 2 dB @ antenna connection 850/900 MHz  GSM Power Class 4 (33 dBm ± 2 dB @ antenna connection)  GSM/GPRS Receiver Sensitivity (Typical): 1800/1900 MHz  <-102 dBm, GPRS Coding Scheme 1 (CS1) 850/900 MHz  <-102 dBm, GPRS Coding Scheme 1 (CS1)
  80350 Module Integration Guide  11/10/2008    Confidential  Page 11 of 53  1.5  General Design Guidelines  1.5.1  Advanced tips for an RF friendly layout 1.5.1.1 Ground Plane When designing the 80350 module into the host application, special care must be taken regarding the design of grounding on the host PCB. Proper grounding of the module’ is an essential part of any good application, as it can very effectively keep EMI in check and ensure good heat dissipation. An example is shown in the drawing below:  1. It is recommended that the entire board space underneath the 80350 module be made the ground plate with sufficient ground vias, and this ground be adequately connected to the mounting tab ground. In doing so, good connectivity can be achieved between the module’s ground and that of the host board.    2. Running traces beneath this ground plate is strongly discouraged.
  80350 Module Integration Guide  11/10/2008    Confidential  Page 12 of 53  1.5.1.2  Antenna and RF Signal Trace For best antenna performance, please ensure that the antenna’s RF trace be designed to be 50 ohm special impedance line, and that there are a sufficient number of ground holes around the antenna impedance line and connector. Keep other traces of the module and the host board as far from this impedance line as possible. It should be avoided that other traces run in parallel to or cross the antenna impedance line. The antenna should be kept away metallic components. 1.5.1.3 Vbatt Input The power supply of the 80350 module is of critical importance to the module’s stability and safety. The 80350 module encompasses all working elements of GSM. It is recommended that the width of power trace be greater than 2 mm, and that a sufficiently large capacitor be placed in the nearest vicinity of the Power pin (two 1000uF capacitors, preferably, low ESR Tantalum capacitors) in order to cope with bursts during GSM operation (such bursts cause voltage transients as shown in the figure below).
  80350 Module Integration Guide  11/10/2008    Confidential  Page 13 of 53 The following picture shows an example of the power supply trace for the module. The trace covers the entire power pin of the module. The wide trace is intended to minimize voltage drop over the trace. .
  80350 Module Integration Guide  11/10/2008    Confidential  Page 14 of 53  1.5.2  Audio Reference Design 1.5.2.1 Audio schematics The audio quality is very much dependent on the circuit design and layout. As an aid to obtaining good audio quality, a reference design has been included below.  1. Please serially place a Bead on Audio In/Out (see in the following circuit: L100, L101, L102, L103, L106 and L107) in order to reduce GSM TDD noise. Bead (100MHz, R>=1K ohm) is recommended. 2. Add a small capacitor on each audio trace. This small capacitor is for further reducing the TDD noise. The typical value of capacitance is 10pF to 100pF. The actually value needs to be tuned based on the location and layout of the audio circuitry. 3. The suggested locations of the capacitors and Bead are in the vicinity of Microphone and Receiver, rather than the module. 4. Maintain proper separation of the Audio In reference ground from the Audio Out reference ground so as to minimize ECHO coupling in the circuitry. 5. Microphone and Receiver should be physically separated from one another, e.g., on the two far ends of the evaluation board, as the spatial coupling of voice signal may occur, resulting in ECHO or screeching sound.
  80350 Module Integration Guide  11/10/2008    Confidential  Page 15 of 53   1.5.2.2 Audio Layout Audio signals are very weak and are in the category of weak analog signals; they are extremely susceptible to interference from digital signals. Therefore, it is suggested that audio signal traces follow the same layer differential trace layout method, and be kept far away from strong digital signals (e.g., power signal, RF related signal, CLK signal and high-speed Bus).
  80350 Module Integration Guide  11/10/2008    Confidential  Page 16 of 53  2.  Technical Specification  2.1 Block Diagram
  80350 Module Integration Guide  11/10/2008    Confidential  Page 17 of 53  2.2  Hardware Key Parts  Part Description CPU  IC-CPU,AD6720ABCZ-RL,GP,BGA,TAP,39MHZ,289PIN,ADI Memory  IC-MEMORY,K5L3316CAM-D770,GP,FBGA,TRAY,SAMSUNG Transceiver  IC-RF,AD6549BCPZ,GP,LFCSP,TAP,32PIN,GSM850/900 DCS/PCS,ADI RF Switcher  IC-RFSW,LMSP43MA-271TEMP,GP,QFN,TAP,16PIN,GSM,MURATA SAW-Filter  FILTER,SAFED881MFL0F05R00,GP,881.5MHZ,5P,MURATA SAW-Filter  FILTER,SAFED1G96FA0F00R00-GP,GP,1.96GHZ,5P,MURATA SAW-Filter  FILTER,SAFED942MFM0F00R00-GP,GP,942.5MHZ,5P,MURATA SAW-Filter  FILTER,SAFED1G84FB0F00R00-GP,GP,1842.5MHZ,5P,MURATA Oscillator  XTAL,MC-146,GP,32.768KHZ,20PPM,12.5PF,EPS TCXO  XTAL,TTS18VSG-A5,GP,26MHZ,10PPM,3.5PF,TOKYO RF-PA  IC-RF,SKY77318,GP,TAP,20PIN,GSM900/GSM850,SKYWORKS B2B Connector  CONN,AXK880125WG,GP,80PIN,SMD,TAP,FPC,MA RF Connector  CONN,CL331-0471-0-10,GP,ML,2PIN,SMD,TAP,HRS  2.3  Absolute Maximum Ratings The absolute maximum ratings stated in following Table are stress ratings under any conditions. Stresses beyond any of these limits will cause permanent damage to the 80350 module. Parameter  Min  Max  Unit Supply Voltage BATT  -0.3  5.5  V Voltage at digital pins in POWER DOWN mode  -0.3  0.3  V Voltage at digital pins in normal operation  -0.3  3.05  or VEXT+0.3  V Voltage at analog pins in POWER DOWN mode  -0.3  0.3  V Voltage at VCHARGE pin  -0.3  5.5  V VSENSE   5.5  V ISENSE  5.5 V VRTC  -0.3  5.5  V Operating Rating:     -20°C to +70°C Storage Temperatures:   -40°C to +85°C
  80350 Module Integration Guide  11/10/2008    Confidential  Page 18 of 53  3. Physical Interfaces    Mounting Tabs    80350 Dimension (mm)
  80350 Module Integration Guide  11/10/2008    Confidential  Page 19 of 53  3.1  Module Mounting to Host Board (Reference) The module provides mounting tabs that needs to be soldered to a PCB. These tabs provide circuit grounding for the module.    Host Board Layout
  80350 Module Integration Guide  11/10/2008    Confidential  Page 20 of 53   A Type Pad    B Type Pad
  80350 Module Integration Guide  11/10/2008    Confidential  Page 21 of 53  3.2 Connectors On the 80350 module: CONN,AXK880125WG,GP,80PIN,SMD,TAP,FPC,MAT  Modem module manufacturer Part Number is 6012A0190101. MATSUSHITA Part Number is AXK880125WG
  80350 Module Integration Guide  11/10/2008    Confidential  Page 22 of 53 On the Host: CONN,AXK780327G,GP,x,80PIN,SMD,TAP,FPC,MAT Modem module manufacturer Part Number = 6012A0190001 MATSUSHITA Part Number is AXK780327G   Note:  The above information regarding the connector and mating connector are taken from the pertinent manufacturer specifications; for more details, please refer to the specifications of the part manufacturer
  80350 Module Integration Guide  11/10/2008    Confidential  Page 23 of 53  3.3 RF Connection 3.3.1  Coaxial Connector Option On the module: GP,ML,2PIN,SMD,TAP Internal Part Number = 6012A0189501 HIROSE: CL331-0471-0-10    3.3.2 Note:  The above information regarding the connector and mating connector are taken from the pertinent manufacturer specifications; for more details, please refer to the specifications of the part manufacturer.
  80350 Module Integration Guide  11/10/2008    Confidential  Page 24 of 53 I/O Connector Pin Assignment The following table shows the pin assignment on the input/output connector.  Pin  I/O  80350 Define  Description (Default function / secondary function) 1  Ground  DGND  Ground 2   Reserved  Floating 3   NC  No connect 4 Ground DGND  Ground 5   Reserved  Floating 6   Reserved  Floating 7   Reserved  Floating 8   Reserved  Floating 9   Reserved  Floating 10   DBGTX  Debug TX 11   Reserved  Floating 12   NC  No connect 13   NC  No connect 14   Reserved  Floating 15   NC  No connect 16    SIM_CLK  SIM interface clock 17    SIM_VCC  SIM interface vcc 18    SIM_DAT  SIM interface data 19   SIM_RST  SIM interface reset 20   NC  No connect 21   NC  No connect 22   NC  No connect 23   PCM_CLK  PCM interface clock 24    PCM_SYNC  PCM interface sync 25   PCM_RXD  PCM interface RXD 26    PCM_TXD  PCM interface TXD 27   Reserved  Floating 28   Reserved  Floating 29   Reserved  Floating 30  UART  RXD0  Serial data input 31  UART  DBGRX  Debug RXD 32  UART  TXD0  Serial data output 33   Reserved  Floating 34   Reserved  Floating 35   Reserved  Floating 36 Ground DGND  Ground 37  Ground  DGND  Ground 38 Ground DGND  Ground 39  Ground  DGND  Ground 40 Ground DGND  Ground 41  Power  VBATT  Power 42 Power VBATT  Power 43  Power  VBATT  Power 44 Power VBATT  Power 45  Power  VBATT  Power
  80350 Module Integration Guide  11/10/2008    Confidential  Page 25 of 53  46   Reserved  Floating 47  UART  RING0  ring indicate 48  UART  DSR0  Data set ready 49  UART  RTS0  Ready to send 50  UART  DTR0  Data terminal ready0 51   Reserved  Floating 52  UART  CTS0  Clear to Send 53   Reserved  Floating 54  UART  DCD0  Data carrier detect 55  I  /RESET  External Reset input 56 O  POWER_KEY Power Key 57  Ground  AGND  Ground 58  Analog  MIC1N  Auxiliary Audio input 59  Analog  MIC1P  Auxiliary Audio input 60  Analog  MIC2P  Auxiliary Audio input 61  Analog  MIC2N  Auxiliary Audio input 62  Analog  SPKN  Auxiliary Audio output 63  Analog  SPKP  Auxiliary Audio output 64  Analog  RECP  Auxiliary Audio output 65  Analog  RECN  Auxiliary Audio output 66   Reserved  Floating 67  Power  Reserved  Floating 68   NC  No connect 69   NC  No connect 70   Reserved  Floating 71   NC  No connect 72   NC  No connect 73   NC  No connect 74   Reserved  Floating 75   Reserved  Floating 76   Reserved  Floating 77   NC  No connect 78   Reserved  Floating 79   NC  No connect 80 Ground DGND  Ground I = Input; O = Output; NC = No connect   3.4 Antenna The 80350 module has an RF antenna interface; for its specification, please refer to Section 3.3.1. Note that this RF connector is a connector only, and is not a switch. Through this connector, various RF performance parameters of the module can be measured.
  80350 Module Integration Guide  11/10/2008    Confidential  Page 26 of 53  3.5  Control Connector Signal Descriptions and Functions 3.5.1  Module Power (Pins 41, 42, 43, 44 & 45) The 80350 module requires a single power supply and no additional working power supply is required. The relevant parameters are defined in the following table. The module has multiple LDOs (Low Drop Linear Voltage Regulators) inside, which support various different working units, including internal memory, GSM RF, CPU, IO ports, audio, etc. Therefore, the 80350 module depends heavily on external power supply, which directly impacts, the stability and RF performance parameters of the module. Please carefully follow the description of power supply and ground in Sections 1.5.1 and 1.5.3.  The 80350 module uses a single voltage source of VBATT = +3.55V to 4.2V. VBATT  Parameters/Conditions Min. Typ. Max. Units Main Battery Supply Voltage In Regulation  3.55 3.8 4.2 Vdc Minimizing Power Loss The measurement network monitors outburst and inburst values. The drop is the difference of both values. The maximum drop (Dmax) since the last start of the module will be saved. In IDLE and SLEEP mode, the module switches off if the minimum battery voltage (Vbattmin) is reached. Example: VImin = 3.3V Dmax =  0.25 V Vbattmin = VImin + Dmax Vbattmin = 3.3V + 0.25V = 3.55V For Example:  Figure : Power supply limits during transmit burst  3.5.2  Reset Signal (Pin 55) The Reset signal is an input to the 80350 module. It is used to reset the module during emergency situations; the signal is Low active..
  80350 Module Integration Guide  11/10/2008    Confidential  Page 27 of 53 When the module is running in a undefined or uncontrollable state, it can be reset by forcefully pulling Low the RESET signal port. It should be noted that all pending processes will be aborted, and hence, will need to be restarted.  Note: During normal module operation, please do not operate on the RESET signal pin. The following diagram shows the relevant signal timings in the module during its Power-On/Power-Off  Power-On / Power-Off and RESET Scenarios  Figure : Power-on and reset with operating voltage at VBATT
  80350 Module Integration Guide  11/10/2008    Confidential  Page 28 of 53    Figure : Power-Off and RESET with operating voltage at VBATT   3.5.3  Power Control (pin 56) The input is equivalent to a “phone ON-button”. A falling-edge on this Active-Low input will switch-ON the module or switch-OFF the module after a delay.  Please see the “Power-On / Power-Off and RESET Scenarios”  3.5.3.1 Power On Pulling the POWER_KEY line on the module LOW for at least 500 msec (after Vbatt is applied and stabilized) is required to turn it ON.  3.5.3.2 Power Off The module can be turned off by a low pulse on the POWER_KEY pin.  3.5.3.3 Using the Power Control Signal  Typical use powering module on/off with a switch:
  80350 Module Integration Guide  11/10/2008    Confidential  Page 29 of 53  3.5.4  SIM Interface (pins 16, 17,18 &19) The 80350 module’s built-in baseband processor has SIM card interface support compatible with ISO7816 IC card standard. Each of the SIM card pins is connected to the corresponding pins of the baseband processor; please refer to pin assignment defined in a preceding section. The following figure shows a reference connection scheme of the SIM card slot, where C109,C125 and R112 are reserved, and are only used when tuning to reduce EMI The user is free to disregard these optional components. The SIM card interface supports 3V and 1.8V SIM cards.   3.5.5  PCM Interface (pins 23, 24, 25 & 26) The PCM can be used to connect the 80350 module with audio devices capable of PCM (Pulse Code Modulation). Interface Name  Function  Input/Output PCM_TXD TXDAI  Output PCM_RXD RXDAI  Input PCM_SYNC Frame SYNC  Output PCM_CLK Bit Clock  Output
  80350 Module Integration Guide  11/10/2008    Confidential  Page 30 of 53 For the PCM signal pins, please pay attention to the direction of I/O pinout. The 80350 module’s PCM codec does not generate any clock signals, but only receive external PCM clock signal; hence, the module can act as a slave PCM device, but not as a master device. Next, more details on parameters and timing of PCM signal are presented. (Excerpts taken from the datasheet of the PCM codec IC)
  80350 Module Integration Guide  11/10/2008    Confidential  Page 31 of 53 PCM interface timing and parameters
  80350 Module Integration Guide  11/10/2008    Confidential  Page 32 of 53 Figure 1: Long Frame timing   Figure 2: Short Frame timing
  80350 Module Integration Guide  11/10/2008    Confidential  Page 33 of 53
  80350 Module Integration Guide  11/10/2008    Confidential  Page 34 of 53  3.5.6  Auxiliary Audio Interface  The 80350 module allows four analog audio channels with physical interfaces on the board-to-board connector; these channels are programmable by software: • Two Auxiliary audio input interfaces, both with balanced or single-ended inputs. • Two Auxiliary audio output interfaces, both with balanced or single-ended outputs. This means that you can connect up to four different audio devices, although only one interface can be operated at any given time. Using software command you can easily switch back and forth among the channels.    3.5.6.1 Auxiliary Audio output interface (Pins 62, 63, 64 & 65) The analog output interface has two channels switchable by software. Specially,  A. SPKP/SPKN(pin62,63) Normal Differential Audio Output Specifications
  80350 Module Integration Guide  11/10/2008    Confidential  Page 35 of 53   B. RECP/RECN(Pin64,65), Normal Differential Audio Output Specifications  Note: For guidelines on the layout of Audio Output circuitry. please refer to Section 1.5.2.2.
  80350 Module Integration Guide  11/10/2008    Confidential  Page 36 of 53  3.5.6.2 Auxiliary Audio input interface (Pins 58, 59, 60 & 61) There are two reserved channels for analog audio input: Specification Typ. Units Full-scale Input Voltage  2.0  Vpp Input Resistance  10  Kohm Comments: A. For voice call, MIC1P/MIC1N interface is recommended as Audio Input. B. On the 80350 module, only Audio Input interface is reserved. Except for the utility for microphone bias voltage, the 80350 board possesses no specific microphone support circuitry; therefore, such needs to be taken into account in the host board design. C. For microphone circuitry layout, please refer to Section 1.5.2.2.  3.5.7  Serial Interface UART0  The module offers an 8-wire unbalanced, asynchronous modem interface ASC0. The module is designed for use as a DCE. Based on the conventions for DTE-DCE connections it communicates with the customer application (DTE) using the following signals: • Port TXD @ application sends data to the module’s TXD0 signal line • Port RXD @ application receives data from the module’s RXD0 signal line Pin Name  Pin Number  Signal Direction  Description RXD0  30  I  Serial data input (DTE <-- DCE) TXD0  32  O  Serial data output (DTE Æ DCE) RTS0  49  O  Request to send (DTE Æ DCE) CTS0  52  I  Clear to Send (DTE <-- DCE) DCD0  54  I  Data carrier detect (DTE <-- DCE) DTR0  50  O  Data terminal ready (DTE Æ DCE) DSR0  48  I  Data set ready (DTE <-- DCE) RING0  47  I  Ring detect output (DTE <-- DCE) Note: Pin Name and Signal Direction from HOST(DTE) Confirm, not the module.
  80350 Module Integration Guide  11/10/2008    Confidential  Page 37 of 53  3.5.8  Debug communication(Pins 10, 31) The module can be calibrated by software through there  two pins.  PINS Assignment  Description  Input/Output 10 DBGTX  Debug transmitter  Output 31 DBGRX  Debug receiver  Input
  80350 Module Integration Guide  11/10/2008    Confidential  Page 38 of 53  4. GSM/GPRS Services The 8035 module supports the following GSM/GPRS services: z  Short Message Services (SMS) z  Class B GPRS Functionality z Voice communication z Circuit-switched data 4.1  Transmission Modes for the GSM/GPRS Services Each of the GSM/GPRS services has two modes that can be enabled separately: z  Mobile-originated (MO): allows the making of a service request (such as making a telephone call or sending an SMS) z  Mobile-terminated (MT): allows receiving a service request (such as receiving a telephone call or an SMS)  Note: Contact your local GSM operator to ensure that the services and modes have been provisioned for the SIM card.  4.2 Voice Communication The 80350 module supports voice functions. On the 80-pin board-to-board connector, there are reserved pins for microphone and earphone hardware interfaces. When these are connected with microphone and earphone hardware, the desired voice functions can be executed by invoking relevant commands in the AT Command set (please refer to 80350 GSM/GPRS Modem Module AT Command Specification).  The 80350 module supports the following four audio coding formats: 1. Full-Rate (FR) 2. Enhanced Full-Rate (EFR) 3. Half-rate (HR)  4. Adaptive Multi-rate (AMR)  4.3 Circuit-Switched Data In this mode, the 80350 module supports both of the connection modes of transmission that are provided by GSM: z  Non-Transparent mode delivers a constantly low error rate but with a non-guaranteed throughput or delay. The Non-Transparent service provides a performance that is closest to using a modem over a fixed Public Switched Telephone Network (PSTN) line.  Note: All GSM service providers may not support transparent mode. In those cases, the 80350 module can be configured to switch automatically to Non-Transparent mode. This capability depends on the settings in the AT+CBST command.
  80350 Module Integration Guide  11/10/2008    Confidential  Page 39 of 53  4.4  Short Message Services(SMS) The 80350 module can perform the following tasks for the GSM Short Message Services: z  Sending and receiving binary messages of up to 160 characters (7-bit characters)  z  Sending and receiving text messages of up to 140 bytes (8-bit data)  z  Submitting a SMS Protocol Data Unit (PDU) to a SMSC (Short Message Service Center) and storing a copy of the PDU until either a report arrives from the network or a timer expires  z  Receiving a SMS PDU from a SMSC  z  Returning a delivery report to the network for a previously received message  z  Receiving a report from the network  z  Notifying the network when the module has sufficient memory capacity available to receive one or more SMS messages (after the module had previously rejected a message because its memory capacity was exceeded)  5. SIM Operation 5.1  Provisioning the SIM The SIM card is configurable. To most users, the basic requirement on the SIM card is the ability to configure and use voice call and SMS Receive services, while some users may further need SMS Send and GPRS data services. The 80350 module can meet the MO (Mobile-Originated) and MT (Mobile-Terminated) usage requirements, and can configure the relevant services of the SIM card through AT commands (this will need support from the application layer software). 5.2  GSM Supported Services The 80350 module supports the following services: z  Voice calls (MO and MT): requires a telephone number z  SMS (MO and MT): requires a telephone number  z  Circuit-switched data calls (MO and MT): requires a telephone number z  The GSM SIM can have multiple telephone numbers.  Note: The services depend on the actual network; please contact the network operator in order make sure that  the services are enabled.
  80350 Module Integration Guide  11/10/2008    Confidential  Page 40 of 53  5.3  GPRS Supported Services The 80350 module supports the following GPRS (modes of operation) that must be enabled by the operator: z  GPRS Packet Connectivity (MO and MT) with Both Dynamic and Static IP option z  GPRS SMS (MO and MT): uses the IP (Dynamic or Static) set by the operator z  Multiple APN Setting z  Quality of Service Options z  Multi-slot 10 Class of Service  5.4  GSM Modes of Operation When provisioning the SIM for the 80350 module, enable the following modes of operation: z  Voice calls: configure the SIM for both MO and MT service (to send and receive) z  SMS: configure the SIM either for MT alone (to receive) or for both MO and MT (to send and receive) z  Circuit Switched Data: configure the SIM either for MO alone (to send) or for both MO and MT (to send and receive)  Voice  SMS  CS Data  GPRS  Function MO/MT  MT  MO    Voice calls, receive SMS, make data calls MO/MT  MO/MT  MO    Voice calls, receive / send SMS, make data calls MO/MT MO/MT MO/MT   Voice calls, receive / send SMS, make / receive data calls (requires an additional data telephone number)
  80350 Module Integration Guide  11/10/2008    Confidential  Page 41 of 53  6. Software Interface 6.1 API Interface The 80350 module’s default startup mode is the AT command mode. In this mode, PC Super Terminal or other serial port communication tools may be used to issue AT commands to the module.  The 80350 module’s default serial communication is set at 115200 baud, no parity, 8 data bits, 1 stop bit, and no flow control. A user can send/receive AT commands, data, or response to/from the module via one of the two methods:  z  Straight serial communication via HyperTerminal or similar application   Straight serial communication provides the user with the following capabilities:  z  Send AT commands and receive response  z  Receive SMS notification  z  Make a voice, data or fax call  z  Receive any unsolicited message   6.2  AT Command Set This is addressed separately in the document “80350 GSM/GPRS Modem Module AT Command Specification”.
  80350 Module Integration Guide  11/10/2008    Confidential  Page 42 of 53  7.  Setup and Initialization The 80350 module can be controlled by AT command through the COM Port A on the 80350 motherboard.    80350 Motherboard Outline:        80350 Motherboard I/O Port B  I/O Port A  COM Port B COM Port A Module On Trigger Reset  Key Power Connector  BPower On/Off Switch Power Connector  A SIM Holder 80350 Module+ - + - On Off On 80350 Module
  80350 Module Integration Guide  11/10/2008    Confidential  Page 43 of 53  Parts:  Item  Function  Comments I/O Port A  Reserved   I/O Port B  Reserved   COM Port A  COM port to communicate with PC  DB9 Connector COM Port B  Reserved   Power Connector A  Connect with power supply  DC 3.55 to 4.2 V Power Connector B  Connect with power supply  DC 3.55 to 4.2 V Power On/Off Switch  On/Off the power   Module On Trigger  Power On the module    Reset Key  Reset the module    80350 Module  The 80350 Module   SIM Holder  Using for SIM card     Steps for setting up the testing hardware environment:  1. Install the 80350 module to the 80350 motherboard 2. Put the SIM card into the SIM Holder 3. Plug the power supply to any one of the Power Connector. 4. Power on the 80350 module by switch the GSM On Trigger to “On”.   7.1 Initialization 7.1.1 Start HyperTerminal  On Windows XP, click on: Start>Programs>Accessories>Communications>HyperTerminal  1. You should see the following screen.    2. Enter a name for the Connection. In this example, the Name is Test COM1.  3. Click OK.
  80350 Module Integration Guide  11/10/2008    Confidential  Page 44 of 53  4. The next window that will appear is the Connect To window.    5. Change the Connect Using setting to the Com port that was determined in Step 2.  6. Click OK.  7. The next window is the Port Settings window.
  80350 Module Integration Guide  11/10/2008    Confidential  Page 45 of 53  8. Make sure the settings match the example.  9. Click OK.  10. Now the Main Program Window should appear.    11. Terminal Setup Testing. a. Make sure the cursor is in the main window. b. Type “AT” and press “Enter” c. You should see the module responds back with “OK” in the Main Window d. If this happens, the COM port is configured correctly. e. At this point you are ready to configure and test the 80350 with AT commands.
  80350 Module Integration Guide  11/10/2008    Confidential  Page 46 of 53  7.1.2 Initialization Command  After the module power on, user can initialize the module by following AT commands  Unsolicited  *TSYSSTART System start Unsolicited  +CFUN: 1  Full functionality (Default) Entry  ATE1  Echo mode on Response  OK  Command is valid Entry  AT&D1  ON->OFF on DTR: Change to command mode with call  remaining connected Response  OK  Command is valid Entry  ATS0=0  automatic answering is disabled Response  OK  Command is valid Entry AT+CMEE=1  enable result code and use numeric values Response  OK  Command is valid Entry  AT+CRC=1  the extended format of incoming call  indication is used Response  OK  Command is valid Entry  AT+CREG=1  enable network registration unsolicited result code +CREG: <stat>  Response  OK  Command is valid Entry  AT+COPS=3,2  set only <format> (for read command +COPS?) – not shown in Read command response and short format alphanumeric <oper> Response  OK  Command is valid Entry  AT+VTD=3  duration of the tone in 1/10 seconds Response  OK  Command is valid Entry AT+CCWA=1  enable presentation of an unsolicited result code Response  OK  Command is valid Entry AT+CLIP=1  display unsolicited result codes Response  OK  Command is valid Entry AT+CMUT=0  mute off Response  OK  Command is valid
  80350 Module Integration Guide  11/10/2008    Confidential  Page 47 of 53  7.2  Send SMS Example  Entry  AT+CMGF=1  Select SMS format is text  Response  OK  Command is valid Entry AT+CNMI=2,2,2,0,0  New SMS unsolicited result code: +CMT: Response  OK  Command is valid Entry AT+CSCS="IRA"  Select international reference alphabet Response  OK  Command is valid Entry AT+CSCA="987654321"  Select SMS Service Centre Address Response  OK  Command is valid Entry  AT+CMGS="123456789"  Send a message to 123456789 Response  >  Ready to enter a message. Entry  This is a test message^Z    Enter the text message “This is a test message”.  End the message with Control Z. Response  +CMGS: 1 OK  Successful transmission.  The number will increment with each SMS sent. Entry  AT+CMGL= "ALL"  List All messages from preferred store Response  +CMGL:1,"REC READ","+123456789",,"08/08/08,18:02:15+32" M  OK List all message Entry  AT+CMGR=1  Read SMS message in preferred store 1 Response  +CMGR: "REC READ","+987654321",,"08/08/08,18:02:15+32" M  OK Read 1 message Entry  AT+CMGD= 1  Delete SMS message in preferred store 1. Response  OK  Successful delete
  80350 Module Integration Guide  11/10/2008    Confidential  Page 48 of 53  7.3  Voice Call Example 7.3.1 MO  The call is OK: Entry  ATD10086;  Make a call Unsolicited  +WIND: 5,1  The call (id =1) has been established Response  OK  Command is valid Unsolicited  +WIND: 2  The MT is ringing Unsolicited  +WIND: 9,1  The call is connected Entry  ATH  End the call Unsolicited  +WIND: 6,1  The call is disconnected Response  OK  Command is valid  MT is busy: Entry  ATD10086;  Make a call Unsolicited  +WIND: 5,1  The call (id =1) has been established Response  OK  Command is valid Unsolicited  +WIND: 6,1  The call is disconnected Unsolicited  BUSY  MT is busy  MT can’t be connected: Entry  ATD10086;  Make a call Unsolicited  +WIND: 5,1  The call (id =1) has been established Response  OK  Command is valid Unsolicited  +WIND: 6,1  The call is disconnected Unsolicited  NO CARRIER  MT cannot be connected  7.3.2 MT Unsolicited  +WIND: 5,1  The call (id =1) has been established Unsolicited  RING  The MT is ringing Entry  ATA  Accept the call Response  OK  Command is valid Unsolicited  +WIND: 9,1  The call is connected
  80350 Module Integration Guide  11/10/2008    Confidential  Page 49 of 53  7.4  GPRS Packet Examples  After the module register on a GSM network: Entry  AT+CGATT=1  AT command to start the ATTACH sequence Response OK  Successfully Attached  If the network is a transparent network, then you can activate using HyperTerminal.  If it is non transparent, you have to use a PPP link to activate: Entry AT+CGDCONT=1,”IP”,”CMWAP”,””,0,0  CMWAP value will be provided by carrier Response  OK  Command is valid Entry AT+CGACT=1,1  Request context activation. Response  OK  Successful context activation.  GPRS detach and deactivate: Entry  AT+CGACT=0,1  AT command to deactivate. Response OK  Successful deactivation. Entry  AT+CGATT=0  AT command to detach. Response OK  Successful detach.
  80350 Module Integration Guide  11/10/2008    Confidential  Page 50 of 53  References  1. AT Command Set Reference [80350 GSM/GPRS Modem Module AT Command Specification]  2. GSM 07.05: “Digital cellular telecommunications systems (Phase 2+); Use of Data Terminal Equipment – Data Circuit terminating Equipment (DTE – DCE) interface for Short Message Service (SMS) and Cell Broadcast Service (CBS)”.   3. GSM 07.07: “Digital cellular telecommunications systems (Phase 2+); AT command set for GSM Mobile Equipment (ME)”.   4. ITU-T Draft new Recommendation V.25ter: “Serial asynchronous automatic dialing and control”.  5. AD6720 Technical Data (REV. OCTOBER 18,2005)  6. NARROW-PITCH CONNECTORS Specifications (Jul.13, 2006)  7. U.FL-R-SMT (10) Specifications (Apr.17, 1997)  8. AK2301-MS0416-1-00 Specifications (Aug 31, 2005)
  80350 Module Integration Guide  11/10/2008    Confidential  Page 51 of 53  Abbreviation Abbreviation  Description  ADC   Analog-to-Digital Converter  AFC   Automatic Frequency Control  AGC   Automatic Gain Control  ANSI   American National Standards Institute  ARFCN   Absolute Radio Frequency Channel Number  ARP   Antenna Reference Point  ASC0 / ASC1   Asynchronous Serial Controller. Abbreviations used for first and second serial inter-face of MC55i  ASIC   Application Specific Integrated Circuit  B   Thermistor Constant  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-Analog Converter  DAI   Digital Audio Interface  dBm0   Digital level, 3.14dBm0 corresponds to full scale, see ITU G.711, A-law  DCE   Data Communication Equipment (typically modems, e.g. Siemens GSM engine)  DCS 1800   Digital Cellular System, also referred to as PCN  DRX   Discontinuous Reception  DSB   Development Support Box  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  DUN Dial-Up Networking
  80350 Module Integration Guide  11/10/2008    Confidential  Page 52 of 53 EFR   Enhanced Full Rate  EGSM   Enhanced GSM   Abbreviation  Description  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  IMEI   International Mobile Equipment Identity  ISO   International Standards Organization  ITU   International Telecommunications Union  kbps   kbits per second  LED   Light Emitting Diode  Li-Ion   Lithium-Ion  Mbps   Mbits per second  MMI   Man Machine Interface  MO   Mobile Originated  MS   Mobile Station (GSM engine), also referred to as TE  MSISDN   Mobile Station International ISDN number  MT   Mobile Terminated  NTC   Negative Temperature Coefficient  OEM   Original Equipment Manufacturer  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
  80350 Module Integration Guide  11/10/2008    Confidential  Page 53 of 53 PCN   Personal Communications Network, also referred to as DCS 1800  PCS   Personal Communication System, also referred to as GSM 1900  PDU   Protocol Data Unit   Abbreviation  Description  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  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

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