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Quectel M35 User Manual

Manual is about: GSM/GPRS Module Series

Summary of M35

  • Page 1

    M35 user manual gsm/gprs module series rev. M35_user_manual_v3.1 date: 2014-11-26 www.Quectel.Com.

  • Page 2

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 1 / 85 our aim is to provide customers with timely and comprehensive service. For any assistance, please contact our company headquarters: quectel wireless solutions co., ltd. Office 501, building 13, no.99, tianzhou road...

  • Page 3: About The Document

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 2 / 85 about the document history revision date author description 1.0 2011-12-29 luka wu initial 1.1 2012-05-18 luka wu 1. Added current consumption in gprs communication mode. 2. Modified at command at+qaudch in chapter...

  • Page 4

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 3 / 85 5. Modified uart application in section 3.7.3 6. Modified sim card interface in section 3.10 7. Added antenna requirement in section 4.5.

  • Page 5: Contents

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 4 / 85 contents about the document ................................................................................................................................... 2 contents ..............................................

  • Page 6

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 5 / 85 3.7.1. Uart port ...................................................................................................................... 39 3.7.1.1. The features of uart port ...........................................

  • Page 7

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 6 / 85 7.1. Storage .................................................................................................................................. 74 7.2. Soldering .......................................................

  • Page 8: Table Index

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 7 / 85 table index table 1: module key features ............................................................................................................... 13 table 2: coding schemes and maximum net data rates over ai...

  • Page 9: Figure Index

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 8 / 85 figure index figure 1: module functional diagram ............................................................................................... 16 figure 2: pin assignment ............................................

  • Page 10

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 9 / 85 figure 42: rf soldering sample ........................................................................................................... 64 figure 43: m35 module top and side dimensions (unit: mm) ..................

  • Page 11: Introduction

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 10 / 85 1 introduction this document defines the m35 module and describes its hardware interface which are connected with your application and the air interface. This document can help you quickly understand module interf...

  • Page 12: Safety Information

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 11 / 85 1.1. Safety information the following safety precautions must be observed during all phases of the operation, such as usage, service or repair of any cellular terminal or mobile incorporating m35 module. Manufactu...

  • Page 13: Product  Concept

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 12 / 85 2 product concept 2.1. General description m35 is a quad-band gsm/gprs engine that works at frequencies of gsm850mhz, egsm900, dcs1800 and pcs1900mhz. The m35 features gprs multi-slot class 12 and supports the gpr...

  • Page 14: Key Features

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 13 / 85 module usage. This module should not be installed and operating simultaneously with other radio. The manual of the host system, which uses m35 must include rf exposure warning statement to advice user should keep ...

  • Page 15

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 14 / 85 power supply single supply voltage: 3.3v ~ 4.6v typical supply voltage: 4v power saving typical power consumption in sleep mode: 1.3 ma @drx=5 1.2 ma @drx=9 frequency bands  quad-band: gsm850, egsm900, dcs1800, p...

  • Page 16: Functional Diagram

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 15 / 85 1) when the module works within this temperature range, the deviations from the gsm specification may occur. For example, the frequency error or the phase error will be increased. Table 2: coding schemes and maxim...

  • Page 17: Evaluation Board

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 16 / 85 —turn-on/off interface —uart interfaces —rtc interface —audio interfaces —pcm interface —sim interfaces —rf interface bb&rf rf pam 26mhz rf transceiver rtc gpio& pwm serial interface sim interface rf_ant vbat pwrk...

  • Page 18: Application  Interface

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 17 / 85 3 application interface the module adopts lcc package and has 42 pins. The following chapters provide detailed descriptions about these pins below:  power supply  power on/down  rtc  serial interfaces  audio ...

  • Page 19: Pin Of Module

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 18 / 85 3.1. Pin of module 3.1.1. Pin assignment vbat rf other gnd uart audio power sim sim_gnd 31 sim1_clk 30 sim1_data 29 sim1_rst 28 sim1_vdd 27 p c m _o u t 41 p c m _in 42 s im 2_ v d d 18 s im 2_ c lk 17 s im 2_ d a...

  • Page 20

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 19 / 85 3.1.2. Pin description table 3: pin description power supply pin name pin no. I/o description dc characteristics comment vbat 33, 34 i main power supply of module: vbat=3.3v~4.6v vmax=4.6v vmin=3.3v vnorm=4.0v mak...

  • Page 21

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 20 / 85 pin name pin no. I/o description dc characteristics comment emerg_ off 11 i emergency off. Pulled down for at least 40ms, which will turn off the module in case of emergency. Use it only when shutdown via pwrkey o...

  • Page 22

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 21 / 85 network status indicator pin name pin no. I/o description dc characteristics comment netlight 13 o network status indication vohmin= 0.85×vdd_ext volmax= 0.15×vdd_ext if unused, keep this pin open. Uart port pin n...

  • Page 23

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 22 / 85 sim1_ data 29 i/o sim1 data volmax= 0.15×sim1_vdd vohmin= 0.85×sim1_vdd pad to sim card holder. Sim1_ rst 28 o sim1 reset volmax= 0.15×sim1_vdd vohmin= 0.85×sim1_vdd sim1_ presence 20 i sim1 card detection. Vilmin...

  • Page 24: Operating Modes

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 23 / 85 table 4: multiplexed functions 1) the alternate function can be configured through at command. For details, please refer to the section 3.9 and section 3.10. 3.2. Operating modes the table below briefly summarizes...

  • Page 25

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 24 / 85 1) use the emerg_off pin only when failing to turn off the module by the command ―at+qpowd=1‖ and the pwrkey pin. For more details, please refer to the section 3.4.2.4. Sleep mode, the module can still receive pag...

  • Page 26: Power Supply

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 25 / 85 3.3. Power supply 3.3.1. Power features of module the power supply is one of the key issues in designing gsm terminals. Because of the 577us radio burst in gsm every 4.615ms, power supply must be able to deliver h...

  • Page 27

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 26 / 85 vbat c2 c1 + c3 c4 gnd 100uf 100nf 10pf 0603 33pf 0603 figure 4: reference circuit for the vbat input 3.3.3. Reference design for power supply the power design for the module is very important, since the performan...

  • Page 28

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 27 / 85 it is suggested to control the module ’s main power supply (vbat) via ldo enable pin to restart the module when the module has become abnormal. Power switch circuit like p-channel mosfet switch circuit can also be...

  • Page 29

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 28 / 85 these configurations, the urc ―rdy‖ would be received from the uart port of the module every time when the module is powered on. For more details, refer to the section ―at+ipr‖ in document [1]. 2. At command respo...

  • Page 30

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 29 / 85 1. Make sure that vbat is stable before pulling down pwrkey pin. The time of t 1 is recommended as 100ms. 2. Emerg_off should be floated when it is unused. 3. For more details about the application of status pin, ...

  • Page 31

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 30 / 85 before the completion of the power down procedure, the module sends out the result code shown below: normal power down 1. This result code does not appear when autobauding is active and dte and dce are not correct...

  • Page 32

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 31 / 85 the normal input voltage range is from 3.3v to 4.6v. If the voltage is >4.6v or automatically shut down itself. If the voltage is under_voltage power down if the voltage is >4.6v, the following urc will be present...

  • Page 33

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 32 / 85 s2 emerg_off tvs2 close to s2 figure 11: reference circuit for emerg_off by using button be cautious to use the pin emerg_off. It should only be used under emergent situation. For instance, if the module is unresp...

  • Page 34: Power Saving

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 33 / 85 the module can also be restarted by the pwrkey after emergency shutdown. Emerg_off (input) status (output) delay >500ms pulldown >40ms pwrkey (input) figure 13: timing of restarting system after emergency shutdown...

  • Page 35

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 34 / 85 if the module is set to minimum functionality by ―at+cfun=0‖, the rf function and sim card function would be disabled. In this case, the uart port is still accessible, but all at commands related with rf function ...

  • Page 36: Rtc Backup

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 35 / 85 3.5.4. Summary of state transition table 6: summary of state transition 3.6. Rtc backup the rtc (real time clock) function is supported. The rtc is designed to work with an internal power supply. There are three k...

  • Page 37

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 36 / 85 non-chargeable backup battery module rtc core vbat power supply ldo/dcdc ldo vrtc 1.5k figure 14: vrtc is supplied by a non-chargeable battery rechargeable backup battery module rtc core vbat power supply ldo/dcdc...

  • Page 38: Serial Interfaces

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 37 / 85 for the choice of a rechargeable or non-chargeable coin-cell battery, please visit http://www.Sii.Co.Jp/en/. If the module is only powered by vrtc , the real time will have an error about 5 minutes a day. If you w...

  • Page 39

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 38 / 85 the logic levels are described in the following table. Table 7: logic levels of the uart interfaces table 8: pin definition of the uart interfaces 1. 1) dtr pin can be used as sim1_presence pin via ―at+qsimdet‖ co...

  • Page 40

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 39 / 85 3.7.1. Uart port 3.7.1.1. The features of uart port  seven lines on uart interface.  contain data lines txd and rxd, hardware flow control lines rts and cts, other control lines dtr, dcd and ri.  used for at co...

  • Page 41

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 40 / 85  if autobauding is active it is not recommended to switch to multiplex mode. To assure reliable communication and avoid any problems caused by undetermined baud rate between dce and dte, it is strongly recommende...

  • Page 42

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 41 / 85 three-line connection is shown as below. Txd rxd gnd uart port rts 0r txd rxd gnd module (dce) host (dte) controller figure 18: reference design for uart port uart port with hardware flow control is shown as below...

  • Page 43

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 42 / 85 3.7.1.3. Firmware upgrade the txd, rxd can be used to upgrade firmware. The pwrkey pin must be pulled down before firmware upgrade. The reference circuit is shown as below: io connector txd rxd gnd pwrkey module (...

  • Page 44

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 43 / 85 the reference design for debug port is shown as below. Peripheral txd rxd gnd module dbg_txd dbg_rxd gnd figure 21: reference design for debug port 3.7.3. Uart application the reference design of 3.3v level match ...

  • Page 45: Audio Interfaces

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 44 / 85 the following circuit shows a reference design for the communication between module and pc. Since the electrical level of module is 2.8v, so a rs-232 level shifter must be used. Note that you should assure the io ...

  • Page 46

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 45 / 85 ain1 and ain2 can be used for input of microphone and line. An electret microphone is usually used. Ain1 and ain2 are both differential input channels. Aout1 is used for output of the receiver. This channel is typ...

  • Page 47

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 46 / 85 3.8.1. Decrease tdd noise and other noise the 33pf capacitor is applied for filtering out 900mhz rf interference when the module is transmitting at egsm900mhz. Without placing this capacitor, tdd noise could be he...

  • Page 48

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 47 / 85 3.8.3. Receiver interface design spk1p spk1n differential layout module 10pf 0603 close to speaker gnd esd 33pf 0603 33pf 0603 gnd 10pf 0603 esd 10pf 0603 33pf 0603 figure 25: reference interface design of aout1 3...

  • Page 49

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 48 / 85 3.8.5. Loud speaker interface design loudspkn 0r 0r loudspkp 8 ohm module gnd gnd gnd close to speaker 10pf 33pf 33pf 10pf 10pf 33pf gnd gnd gnd differential layout 0603 0603 0603 0603 0603 0603 esd esd figure 27:...

  • Page 50: Pcm Interface

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 49 / 85 3.9. Pcm interface pulse-code modulation (pcm) is a converter that changes the consecutive analog audio signal to discrete digital signal. The whole procedure of pulse-code modulation contains sampling, quantizing...

  • Page 51

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 50 / 85 3.9.1. Configuration m35 module supports 13-bit line code pcm format. The sample rate is 8 khz, and the clock source is 256 khz, and the module can only act as master mode. The pcm interface supports both long and...

  • Page 52

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 51 / 85 12 11 10 9 8 7 6 5 4 3 2 1 0 12 11 10 9 8 7 6 5 4 3 2 1 0 pcm_clk pcm_sync pcm_out pcm_in msb msb sign extension sign extension figure 28: long synchronization & sign extension diagram 12 11 10 9 8 7 6 5 4 3 2 1 0...

  • Page 53

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 52 / 85 pcm_clk pcm_sync pcm_out pcm_in 12 11 10 9 8 7 6 5 4 3 2 1 0 12 11 10 9 8 7 6 5 4 3 2 1 0 msb msb zero padding zero padding figure 31: short synchronization & zero padding diagram 3.9.3. Reference design m35 can o...

  • Page 54: Sim Card Interfaces

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 53 / 85 table 15: qpcmon command description ―at+qpcmvol‖ can configure the volume of input and output. At+qpcmvol=vol_pcm_in, vol_pcm_out table 16: qpcmvol command description 3.10. Sim card interfaces the module contain...

  • Page 55

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 54 / 85 the sim interfaces are powered by an internal regulator in the module. Both 1.8v and 3.0v sim cards are supported. Table 17: pin definition of the sim interfaces 1) if several interfaces share the same i/o pin, to...

  • Page 56

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 55 / 85 the following figure is the reference design for sim1 interface. Vdd_ext module sim1_vdd sim_gnd sim1_rst sim1_clk sim1_data sim1_presence 22r 22r 22r 10k 100nf sim_holder gnd gnd tvs 33pf 33pf 33pf33pf vcc rst cl...

  • Page 57

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 56 / 85 the following figure is the reference design for sim2 interface with the 6-pin sim card holder. Module sim2_vdd sim_gnd sim2_rst sim2_clk sim2_data 22r 22r 22r 100nf sim_holder gnd tvs 33pf 33pf 33pf vcc rst clk i...

  • Page 58: Behaviors Of The Ri

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 57 / 85 3.11. Behaviors of the ri when using pcm interface, ri pin can be used as pcm_clk. Table 18: behaviors of the ri if urc of sms is disabled, the ri will not change. If the module is used as a caller, the ri would m...

  • Page 59: Network Status Indication

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 58 / 85 ri idle calling on-hook talking high low idle figure 37: ri behavior as a caller ri idle or talking urc or sms received high low 120ms figure 38: ri behavior of urc or sms received 3.12. Network status indication ...

  • Page 60

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 59 / 85 a reference circuit is shown as below. Module netlight 4.7k 47k 300r vbat figure 39: reference design for netlight 3.13. Operating status indication the status pin will output a high level after the module being t...

  • Page 61

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 60 / 85 module status 4.7k 47k 300r vbat figure 40: reference design for status.

  • Page 62: Antenna  Interface

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 61 / 85 4 antenna interface the pin 39 is the rf antenna pad. The rf interface has an impedance of 50Ω. Table 21: pin definition of the rf_ant 4.1. Rf reference design the reference design for rf is shown as below. Module...

  • Page 63: Rf Output Power

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 62 / 85 order to give a better grounding. Besides, a π- type match circuit is suggested to be used to adjust the rf performance. 4.2. Rf output power table 22: the module conducted rf output power in gprs 4 slots tx mode,...

  • Page 64: Operating Frequencies

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 63 / 85 4.4. Operating frequencies table 24: the module operating frequencies 4.5. Antenna requirement the following table shows the requirement on gsm antenna. Table 25: antenna cable requirements type requirements gsm85...

  • Page 65: Rf Cable Soldering

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 64 / 85 4.6. Rf cable soldering soldering the rf cable to rf pad of module correctly will reduce the loss on the path of rf, please refer to the following example of rf soldering. Figure 42: rf soldering sample.

  • Page 66: Electrical,

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 65 / 85 5 electrical, reliability and radio characteristics 5.1. Absolute maximum ratings absolute maximum ratings for power supply and voltage on digital and analog pins of module are listed in the following table: table...

  • Page 67: Power Supply Ratings

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 66 / 85 1) when the module works within this temperature range, the deviation from the gsm specification may occur. For example, the frequency error or the phase error will be increased. 5.3. Power supply ratings table 29...

  • Page 68: Current Consumption

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 67 / 85 1. 1) power control level pcl 5. 2. 2) power control level pcl 0. 3. Under the egsm900 spectrum，the power of 1rx and 4tx has been reduced. 5.4. Current consumption the values of current consumption are shown as be...

  • Page 69: Electro-Static Discharge

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 68 / 85 gprs class 10 is the default setting. The module can be configured from gprs class 1 to class 10. Setting to lower gprs class would make it easier to design the power supply for the module. 5.5. Electro-static dis...

  • Page 70

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 69 / 85 table 31: the esd endurance (temperature: 25ºc, humidity: 45%) tested point contact discharge air discharge vbat,gnd ±5kv ±10kv rf_ant ±5kv ±10kv txd, rxd ±2kv ±4kv others ±0.5kv ±1kv.

  • Page 71: Mechanical  Dimensions

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 70 / 85 6 mechanical dimensions this chapter describes the mechanical dimensions of the module. 6.1. Mechanical dimensions of module figure 43: m35 module top and side dimensions (unit: mm).

  • Page 72

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 71 / 85 1 figure 44: m35 module bottom dimensions (unit: mm).

  • Page 73: Recommended Footprint

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 72 / 85 6.2. Recommended footprint frame line b b a a frame line silksreen silksreen figure 45: recommended footprint (unit: mm) the module should keep about 3mm away from other components in the host pcb. Note.

  • Page 74: Top View Of The Module

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 73 / 85 6.3. Top view of the module figure 46: top view of the module 6.4. Bottom view of the module figure 47: bottom view of the module.

  • Page 75: Storage

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 74 / 85 7 storage and manufacturing 7.1. Storage m35 module is distributed in a vacuum-sealed bag. The restriction for storage is shown as below. Shelf life in the vacuum-sealed bag: 12 months at environments of after the...

  • Page 76: Packaging

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 75 / 85 the squeegee should push the paste on the surface of the stencil that makes the paste fill the stencil openings and penetrate to the pcb. The force on the squeegee should be adjusted so as to produce a clean stenc...

  • Page 77

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 76 / 85 figure 49: tape and reel specification.

  • Page 78

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 77 / 85 ps 6 detail:a detail:a figure 50: dimensions of reel table 32: reel packing model name moq for mp minimum package: 250pcs minimum package×4=1000pcs m35 250pcs size: 370 × 350 × 56mm 3 n.W: 0.63kg g.W: 1.47kg size:...

  • Page 79: Appendix  A  Reference

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 78 / 85 8 appendix a reference table 33: related documents sn document name remark [1] quectel_m35_at_commands_manual at commands manual [2] itu-t draft new recommendation v.25ter serial asynchronous automatic dialing and...

  • Page 80

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 79 / 85 table 34: terms and abbreviations [14] gsm 03.38 digital cellular telecommunications (phase 2+); alphabets and language-specific information [15] gsm 11.10 digital cellular telecommunications (phase 2); mobile sta...

  • Page 81

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 80 / 85 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 m...

  • Page 82

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 81 / 85 mt mobile terminated n.W net weight pap password authentication protocol pbcch packet switched broadcast control channel pcb printed circuit board pdu protocol data unit ppp point-to-point protocol rf radio freque...

  • Page 83

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 82 / 85 vilmax maximum input low level voltage value vilmin minimum input low level voltage value vimax absolute maximum input voltage value vimin absolute minimum input voltage value vohmax maximum output high level volt...

  • Page 84

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 83 / 85 9 appendix b gprs coding sche me four coding schemes are used in gprs protocol. The differences between them are shown in the following table. Table 35: description of different coding schemes radio block structur...

  • Page 85

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 84 / 85 radio block structure of cs-4 is shown as the following figure. Figure 52: radio block structure of cs-4 block code no coding 456 bits usf bcs radio block.

  • Page 86

    Gsm/gprs module series m35 user manual m35_user_manual confidential / released 85 / 85 10 appendix c gprs multi-slot class twenty-nine classes of gprs multi-slot modes are defined for ms in gprs specification. Multi-slot classes are product dependant, and determine the maximum achievable data rates ...