Nortel Networks RTU-292 Receiving a Telephone Call, Putting a Telephone Call on Hold

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RTU-292 Operations Manual

3.4.4RECEIVING A TELEPHONE CALL

NOTE

The handset-to-telephone path may be left in the enabled condition (HANDSET/PHONE LED ON) even when the unit is not connected to the telephone line. Only one button (TEL LINE/PHONE) must then be pushed to

answer the telephone. The following scenario assumes that the HANDSET/PHONE LED is already ON.

1.When the ring is heard (or the flashing TEL LINE/PHONE LED is observed) indicating an incoming call, push the TEL LINE/PHONE button and speak into the handset. It isn't necessary to press the handset PTT switch to use the telephone.

2.To hang up, press the TEL LINE/PHONE button again. The adjacent LED will turn off.

3.4.5 PUTTING A TELEPHONE CALL ON HOLD

Once a telephone call has been received or initiated and the TEL LINE/PHONE LED is illuminated, pressing the HANDSET/PHONE button or the SPEAKER/PHONE button will put the call on “hold”. (The call will not be cut off as long as the TEL LINE/PHONE button is not pressed.)

For example, if the RTU-292 operator has made a telephone connection and wishes to contact a radio party to continue setting up the patch, he may place the telephone call on “hold” and speak with the radio party using the handset as described in 3.4.6.

3.4.6USING THE HANDSET WITH THE RADIO

Pressing the HANDSET/RADIO button will connect the handset to the radio's audio lines (associated LED will be on). The receive audio will be heard in the earpiece, and when the radio is keyed (via the handset or front panel key switches) the handset mic audio will be routed to the transmitter. The SPEAKER/RADIO pushbutton may also be used to monitor radio receive audio via the RTU-292's front panel speaker.

3.4.7 CONNECTING THE RADIO TO THE TELEPHONE LINE

To patch the radio to the telephone line, push the TEL LINE/RADIO button to ON. This will cause the adaptive hybrid to operate in the following manner:

3.4.7.1 Initial Adaptation

The two-wire to four-wire hybrid in the RTU-292 adapts to the phone line each time the TEL LINE/RADIO button is engaged. To adapt, it measures the characteristics of the line by placing a white noise source (built into the unit), on the line for a short time. While the noise burst is connected, the amount of signal “reflected” from the phone line is measured and adaptation begins. The adaptation algorithm adjusts the adaptive hybrid to minimize the reflected signal, throughout the audio frequency spectrum, from the phone line. During the adaptation process, the TEL LINE/RADIO LED will flash. When adaptation is complete, the

JPS Communications, Inc.

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Contents JPS Communications, Inc JPS P/N Revision JulyProprietary Statement Phone 919 Fax 919Table of Contents RTU-292 Theory of Operation Front Panel Buttons and Indicators Schematic Diagrams List Of Figures List of Tables Glossary This page intentionally left blank Scope Description GeneralMain Board AssembliesTelephone Interface Radio Interface Power Supply SectionHandset/Speaker Interface DSP ModuleEquipment and Accessories Supplied Qty Part NumberOptions Optional Equipment Not SuppliedRTU-292 Specifications Unpacking and Inspection GeneralReshipment of Equipment Installation Considerations Installation OverviewFCC Part 68 Regulations 1RTU-292 Factory Default Settings Feature / Function Adjustment Default SettingDC Input Power Selection Power RequirementsInput Power Selection Line Voltage SelectionProgramming Mode Setup Parameters Configuring the RTU-292Setting Telephone Send and Receive Levels Type of System Recommended Phone Line SettingsFactory default settings are indicated by an asterisk Telephone Send/Receive LevelsVOX Sensitivity VOX HangtimeVOX Hangtime VOX SensitivityTelephone Ring Volume Dial ModeDial Mode RX Line Input ImpedanceFull/Half Duplex Radio Control ModeSW1-3 Radio Control Off Disabled Enabled SW2-8 Full/Half Duplex Off Full Duplex11Voice Prompts Enable Password Protection10Password Protection Voice PromptsInterconnect Information 12Local Phone Enable14TX Level Set-up Mode 13 Local Phone RingthroughPin Function Telephone Connection15J1 TEL Line RJ-11C Radio Connection16P1-RADIO DB-9 Male Handset Connector17J7 Handset RJ12C Jack Terminal Block 18Terminal Block 6 PositionSetting the Transmit Level Audio Level Setup and Adjustments19P2 RS-232 Connector DB-9 Male 5 RS-232 ConnectionSetting the Receive Level 10.1.2RTU-292 Operations Manual Outline Dimensions Control and Connector Locations Location Of Internal Option Settings Internal Option Setting Details Audio Interface Wiring Diagram Interface Details Options Installation and Configuration Installation ChecklistInstallation Checklist Front Panel CONTROLS, Indicators and Connectors Keypad Speaker Volume ControlPhones Volume Control TEL Line ButtonsAudible Ring Button Speaker ButtonsAuto ANS Button KEY Pushbutton4 J2 Local Phone Connector Rear Panel Connectors1 P1 Radio Connector 7 P1 AC Power ConnectorUSE of the RTU-292 Speaker to Monitor Audio OperationOperation Overview Placing a Telephone CallReceiving a Telephone Call Using the Handset with the RadioConnecting the Radio to the Telephone Line Putting a Telephone Call on Hold8.1 Manual Phone Patch Procedure8.2 8.5 8.38.4 8.6Self Test Negative Acknowledge ErrorRemote KEY Automated OperationRadio Is Keyed Keyed Disconnecting DisconnectWaiting For Input Query Radio Is Unkeyed UnkeyedCaller Dials The RTU-292 Caller Enters The Password if enabledRTU-292 Adapts To The Phone Line Placing a Call in the Command Mode RTU-292 Enters the Command ModeTerminating a Call Dtmf Control Commands Operating the RTU-292 from the Front Panel Keypad1Standard Dtmf Operational Commands Dtmf Command Function2Programming Mode Dtmf Commands Inactivity Disconnect Timer RTU-292 Password ProtectionCalling Timer Using the Speed Dial Feature Using the RTU-292 Speed Dial FeatureProgramming the Speed Dial Directory Speed Dial Reset Factory ResetOptional 4 Wire Operation Main Board Front Panel Buttons and IndicatorsAudio BUS Arrangement Telephone Send Circuits Telephone Interface CircuitsTelephone Receive Circuits Receiver Input Amplifier Ring Detector and Tone RingerRadio Interface Circuits Transmitter Audio OutputMicrophone Circuit Dtmf DetectorFSK Modem Speaker and Headphone CircuitsNoise Generator Audio DelayAdaptive Hybrid Peak DetectorDC Power Supply Power SupplyAC Power Supply 8 CPUPrompt Tone Generator Option Interface BoardVoice Prompt Option Speech ProcessorInterface Circuitry Local Phone OptionVoice Prompt Software DIAL/BUSY GeneratorsRS-232 Remote Control Overview Commands Sent to the RTU-2921Command Summary Auto Answer Command Null CommandAudible Ring Command Date Command Dial CommandDisconnect Command Dtmf CommandHandset Phone Command Handset Radio CommandSpeaker Phone Command Speaker Radio CommandSpeed Dial Command SD nnALL num.? CRTel-Line Phone Command Tel-Line Radio CommandTime Command Software Version CommandStatus Returned from the RTU-292 Response SummaryAuto Answer Response Null ResponseCall Starting Response Disconnect Response Dial ResponseDtmf Response Handset Phone Response Elapsed Time ResponseHandset Radio Response Speaker Phone Response Speaker Radio ResponseTel-Line Phone Response Speed Dial ResponseTel-Line Radio Response Time/Date Response Version ResponseCall Progress Responses from the RTU-292 Response Error CodesResponse Error Codes Call Progress ResponsesPerformance Testing Preventive MaintenanceRepair or Replacement AlignmentHybrid Balance Measurement Hybrid Balance Test Set-Up Main Hybrid Test Procedure Alternate Hybrid Test Procedure VOX Sensitivity Test Set-Up VOX Test Procedure VOX Sensitivity MeasurementFault Analysis Replaceable Parts List DescriptionDescription Reference Designator RTU-292 Operations Manual Reference Designator Special Software Versions RTU-292 OptionsSW1-6 Voice Prompts Off Disabled Enabled Installation and ConfigurationVoice Prompts Enable OperationVoice Prompt Option Installation SW1-7 Local Phone Off Disabled Enabled Local Phone Option Installation and ConfigurationLocal Phone Enable SW1-8 Ringthrough Off Disabled Enabled5Local Phone Dtmf Commands Local Phone Option OperationVMM-100 DSP Section VMM-100 HardwareVMM-100 Analog Interface VMR Algorithm VMM-100 Installation and ConfigurationVMM-100 Software Noise Reduction AlgorithmVMM-100 Option Installation VMM-100 Specifications EnvironmentalVMM-100 I/O Connector Information P9 VMM-100 Switch FunctionsDtmf Access Option After the Call Begins Squelch Break Access Option RTU-292 Prompts for ConfirmationCall Logging Option Setting The TimeSetting The Date Checking The Time And DateRadio Control Option Controlling the Radio VIA the RTU-292 Front Panel Keypad9DTMF Radio Control Commands Command Followed By Command DescriptionSchematic Diagrams Blank Index Environmental Self Test Speech Processor
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