Ericsson LBI-39076B system manual Identifying Called ID, Obtaining Working Channel

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OPERATION

LBI-39076B

IDENTIFYING CALLED ID

13.The channel-terminating GTI detects the first DTMF digit, momentarily lights the “DTMF DETECTED” red LED on the front panel, and reports the digit to the Site Controller.

14.The Site Controller directs the line-connected GTI to stop sending a dial tone to the calling line, and starts a counter to count the received DTMF digits.

15.The Site Controller checks the first DTMF digit to see if it is a #, *, or number from 0 to 9.

If the first DTMF digit is a #, the call is identified as a digital call, but the counter is not advanced. (The call will be assigned but audio will be incorrect. This is because ELI does not support digital mode.)

If the first DTMF digit is a * (or a 9 when using pulse dialing), the call is identified as a group call, and the counter is advanced by one.

If the first DTMF digit is a number from 0 to 8, the digit is stored in the ID buffer and the counter is advanced by one.

16.The channel-terminating GTI detects the next DTMF digit, momentarily lights the “DTMF DETECTED” red LED on the front panel, and reports the digit to the Site Controller.

17.The Site Controller receives the report from the channel-terminating GTI, stores the digit in its ID buffer, advances the counter by 1, and checks to see if the counter has reached 5. If the Site Controller is still within the DTMF Digit Detect Duration and the counter has not reached 5, return to step 16.

If the counter has not reached 5 within the 20 second DTMF Digit Detect Duration, the Site Controller will send a message to the channel-terminating GTI instructing it to send the call denied tone or voice prompt, and hang up. This ends the sequence here.

18.If the counter has reached 5, the Site Controller has now received all digits of the called ID, and directs the channel-terminating GTI to stop looking for DTMF digits and disconnect the audio connection from the line-connected GTI.

19.The Site Controller checks to see if the called ID is valid, and if the ID is allowed to receive interconnect calls. (See Inb Interconnect field in System Manager screen 11, panel 2.)

If the called ID is not valid, or is not allowed to receive interconnect calls, the Site Controller sends a message to the line-connected GTI instructing it to send the call denied tone (or voice prompt) and hang up. This ends the sequence here.

OBTAINING WORKING CHANNEL

20.If the called ID is valid and is allowed to receive interconnect calls, the Site Controller checks to see if a working channel with a channel-terminating GTI is available.

If a working channel with a channel-terminating GTI is not currently available, the Site Controller queues the call and instructs the GTI to apply a queue tone (or voice prompt) to the line. When the call comes out of the queue, continue to next step.

21.If a Working Channel with a channel-terminating GTI is available, the Site Controller sends a message to the Control Channel GETC to send the Working Channel assignment to the radio(s) with the called LID or GID.

22.The radio(s) with the called LID or GID receive(s) the Working Channel assignment and tune(s) to the assigned Working Channel.

23.The Site Controller sends a message directing the channel-terminating GTI to insert itself into the audio loop of the assigned Working Channel in preparation for a telephone interconnect call.

24.The Site Controller sends a message directing the channel-connected GTI to apply a ringing tone to the called radio(s) and the line-connected GTI unit to apply a ringback tone to the calling telephone.

25.A radio user hears the ringing tone and pushes the PTT switch.

26.The assigned Working Channel GETC detects the radio transmission on the assigned Working Channel and sends a radio keyed message to the Site Controller. If the Site Controller does not receive this message within the Interconnect Hang Time (see System Manager screen 10, panel 2.), it sends a hang up message to the line-connected GTI and a disconnect message to the Working Channel GETC.

27.If the Site Controller receives the radio keyed message within Interconnect Hang Time, it sends a connect audio message to the Master GTI. The Master GTI directs the line-connected GTI and channel-connected GTI to send the digitized audio to each other over the

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Contents System Manual Revision Date Reason for Change Revision HistoryTable of Contents Table of Contents List of Figures and Tables FiguresFigures and Tables Regulatory Compliance DOC Registration DOC Compliance NoticeDOC Avis DE Conformation Specifications SpecificationsMastr Overview Introduction / DescriptionGTI Units DescriptionIAM Description / InstallationGTI Configurator Software GTI Interface BoardGetc InstallationMDR GTIEmpty Radio SoftwareSite Controller Hardware Site Controller SoftwareRadio Channel Assignments Application Software PROMsPersonality PROMs GTI Software Main BoardRevision-A Main boards Revision-D or E Main boards Processor BoardInterface Board OUT GTI Telephone InterfaceRevision-A Main Board F2&F3Wire E&M, Microwave Wire E&M, TypeEnd-to-End, Loop Start End-to-End, Ground Start Jumper Positions for JP1 Through JP15 Fuses External JP4 Lead Fuse F2 Reference DS1 GTI DIP Switch Settings Revision-D or E Main BoardDid GTI Interface Board Mounting GTI & IAM Mounting GTI ConnectionsTelephone Line Mastr III Power Supply/Audio Mastr II or IIe Power Supply/AudioPCM/Data Bus Site Controller Computer IAM SoftwarePrinter RS-232 Port Power SupplyAlarm Outputs IAM ConnectionsGetc Modification IAM DIP Switch SettingsOperation without System Manager ConfigurationSite Controller Database Interconnect Timing ParametersGeneral Limits for Site Operation with System ManagerWho Can Receive Calls Who Has What Toll Call Restrictions Who Has What PriorityGTI Database RecommendationRTS CTS Remote Data LinkOperation Printer Indicator CDR Received IndicatorAlarm Indicator Low-Battery IndicatorOverview BackupInterconnect Calls StatusTelephone-Originated Call Detecting the CallAnswering the Call Obtaining Working Channel Identifying Called IDEnding the Call Radio-Originated CallObtaining a Working Channel RE-DIALED Digits Interconnect DigitsOverdialed Digits Mastr III Repeaters MaintenanceGTI Removal Mastr II or IIe RepeatersGTI DSP ELI Software UpgradesPlan a All at One Time Software Version Required for Main Board Revision NumberPlan B Half at a Time Maintenance Plan C One at a Time Maintenance IAM Unit No interconnect or radio-to-radio TroubleshootingInterconnect Rotary Definition for Set the Max # Concurrent InterconAll telephone-originated interconnect Toll Call Parameters screen LBI-39076B Glossary GlossaryPresence of a DC loop current between one of the two wires Parts List Glossary / Parts ListEdacs Interconnection DiagramSchematic Diagram Installation Checklist Installation Checklist
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