Motorola I580 service manual IDEN Voice Compression Technology, RF Transmission Bursts

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OVERVIEW: iDEN Voice Compression Technology

algorithms and one digital-signal processor (DSP) to perform voice compression/decompression and RF modulation/demodulation.

Base Station Control Channel

Transmitting 6 of 6 slots continually.

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Portable Unit

When turned on, scans for control station, then transmits one slot every six slots.

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Figure 1-2. i DEN TDMA Format

1.2iDEN Voice Compression Technology

Voice is converted into a digital bit stream by sampling the voice signal at a high rate and converting the samples into numbers, which are represented by bits. A sample consists of 8 bits. Approximately 8000 samples per second (64 Kbps) are required to maintain a reasonable quality.

Voice compression reduces the number of bits per second while maintaining the voice at an acceptable quality level. The iDEN system uses a coding technique called Vector Sum Excited Linear Prediction (VSELP) to compress voice to 4.2 or 8.0 Kbps. The compressed voice-data bits modulate the RF signal. The compression rate is based on the type of call (dispatch or interconnect) and the network configuration established by the local service provider.

Adding error-correction bits to the coded-voice bits increases the required RF-transmission bit rate to approximately 7.4 Kbps for the 4.2 Kbps voice coder and 14.8 Kbps for the 8.0 Kbps voice coder.

1.2.1RF Transmission Bursts

All RF transmissions within an iDEN system occur in 15-millisecond blocks called bursts. An

iDEN base station transmits bursts continuously on each RF frequency it uses. Transmission bursts from the stations are synchronized in time by signals received from the global positioning satellite

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Contents IDEN Digital Multi-Service, Data-Capable Portable I580 Manual Revisions Safety and General Information Electro Magnetic Interference Compatibility Medical DevicesAccessory Safety Information Cleaning and Drying ConsiderationsSafety and General Information Model Information Model Numbering SystemModel Specifications General Receiver TransmitterContents Chapter Basic Level Test Modes and Procedures Chapter Field Level Test Modes and Procedures Appendix a Ordering Replacement Parts and Kits Preface Who Should Use This ManualHow This Manual Is Organized Conventions Used in This Manual Related PublicationsOverview IDEN Digital Modulation TechnologySpectrum of iDEN Quad 16QAM IDEN Voice Compression Technology RF Transmission BurstsCalling Area Coverage Bluetooth Wireless System Global Positioning System GPS SectionMOTOtalk SIM Cards Removing and Inserting a SIM CardTo remove a SIM card Figure Removing a SIM Card To insert a SIM card FigureFEATURES, ICONS, and Indicators I580 FeaturesDisplay Icons Main Menu IconsStatus Icons Power-Up Sequence DISPLAYS, MESSAGES, and AlertsSelf-Test Reset Errors Power-Down SequenceSelf-Test Errors MessagesService Messages Service MessagesAlert Tones Alert TonesAlert Tones Alert Tones Using the Optional Vibrate Function Vibrator SettingsTo set unit to vibrate for all calls From the main menu, select Settings 2-Way Radio Alert Type Test Equipment Preparing for Basic Level TestingReference Accessories Reference UnitCustomer Care Reset ConditionBasic Level Checks and Self Tests Test ConditionsBasic-Level Test Checklist Basic-Level Test ChecklistPreventive Maintenance To clean the unit takes approximately 3 minutesShock and Pressure test time is approximately 3 minutes Mechanical and Electrical ChecksSIM Card Swap Test SIM Card Swap test time is approximately 5 minutesLockup Test Accessory Swap TestAccessory Swap test time is approximately 5 minutes Lockup Test time is approximately 6 minutesBattery Connections test time is approximately 5 minutes Battery Connections TestTesting the GPS Receiver To test the GPS ReceiverSelf-Test Procedures Voltage Recognition TestVoltage Recognition test time is approximately 4 minutes Programming Menu Settings Check Passcode TestPasscode test time is approximately 5 minutes From the main menu, select Settings Display/Info Contrast Phone Calls FeaturesWay Radio Options Volume Features Security FeaturesPersonalize From the main menu, select Settings Security GPS PIN Advanced Features Call Performance TestCall Performance test time is approximately 7 minutes To enter Debug/Trace Mode Basic Level Test Modes and ProceduresEntering Debug Mode Test ModesTrace Mode Display Screens Display ScreensGPS To enter Test Mode Test Mode Test ProceduresEntering Test Mode Audio Loopback TestAudio Loopback test time is approximately 3 minutes ESN and Imei Matching TestDebug Check ESN/IMEI Matching test time is approximately 6 minutesTo monitor the data in the unit 68P80401P05 Technician Test Procedures Connecting the Unit to the RSS Workstation Programming the i580 UnitCodeplug Troubleshooting To access the codeplug Help topic in WindowsCodeplug Help Preparing for Field Level Testing Preparing Equipment for TestingUsing RSS Connecting an iDEN Unit to the R-2660Typical R-2660 Setup To connect the unit to the R-2660To enter Initial Registration mode Operating the R-2660RF Zone Fields and Values Disassembly Sequence Flowchart Assembly/Disassembly ProceduresDisassembling and Reassembling the Unit Remove Battery Cover InstallRemove Remove Battery Remove SIM Card Remove AntennaPreparing for Field Level Testing Remove Antenna Remove Back Housing Remove Main Board, Keypad Remove Flip Assembly Procedure to remove flip assemblyPreparing for Field Level Testing Remove Flip Assembly Install Flip Assembly Procedure to install flip assemblyPreparing for Field Level Testing Install Flip Assembly Exploded View and Parts List I580 Component Parts ListI580 Exploded View Field Level Test Modes and Procedures Field-Level Test Checklist Required Test EquipmentField-Level Test Checklist Done Technical Tests Pass FailSee the Strong Signal Environment section Registration/Call TestSignal Quality Error SQE Test R-2660TX Power Test See Entering Test Mode Press Menu, EditBit Error Rate BER Test PassPower-Up Test Keypad Test Audio Test Use this test to check the audio portion of the unitReset Test ResetReset Log Test To perform the reset log testModel Assembly MA Test Mode Test GPS Global Positioning System Receiver Test Use this test on a unit to check its GPS functionalityYes Bluetooth Test This Page intentionally left blank Mechanical Parts Rework and Repair Recommended EquipmentRecommended Tools Recommended SuppliesRework/Repair Requirements Board Preparation Components IdentificationLand Preparation Procedure Mechanical Parts Rework ProcedureRemoval Procedure Installation Procedure4 J600 RF Connector 6 J401 30 Pin Board-to-Flex Connector5 J752 Audio Jack 7 J400 80 Pin Board-to Flex Connector 8 M002 Simm Connector9 M105 Battery Contact SW-all Key/Switch 10 M2 2 Pin-Contact11 J753 Microphone Socket 13 D401 through D412 LED Replacement Parts Ordering Replacement Parts and KitsCustomer Service Domestic OrdersReplacement Kits Table A-1Mid Rate Travel Chargers Bluetooth Accessories NNTN2344 NA Table A-2. Recommended Test Equipment and Tools Recommended Test Equipment and ToolsRecommended Programming Equipment Table A-3. Recommended Programming EquipmentTable A-4. Recommended Software TTY@68P80401P05@

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