Instruction/ maintenance manual of the product RTU-292 JPS Communications
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Installation and Operation Manual RTU-292 RADIO / TELEPHONE INTERFACE UNIT Designed and Manufactured by: JPS Communications, Inc. 5800 Departure Drive Raleigh, NC 27616 e-mail: jps@jps.com JPS P/N 5970-600200 Revision 1.62 July, 2005 1 JPS Communications, Inc.
RTU-292 Operations Manual Warranty JPS Communications, Inc. warrants its manufactured equipment to be free from defects in material s and workm anship, and to conform to published specifications for a period of 18 months from the date of shipment from the factory or 12 m onths from installation, whichever occurs first.
RTU -292 Operations Manual Table of Contents 1 GENERAL IN FORMATION .......................................................................................................... ............ 1-1 1.1 SCOPE .................................................
RTU-292 Operations Manual 3.1 GENERAL .................................................................................................................... .......................... 3-1 3.2 FRONT PANEL CONTROLS, INDICATORS AND CONNECTOR S ............
RTU -292 Operations Manual 4.2 FRONT PANE L BUTTONS AND INDICA TORS .............................................................................. 4-19 4.3 MAIN BOARD ....................................................................................
RTU-292 Operations Manual 5.4.15 Time /D ate Resp onse ...................................................................................................... ................ 5-17 5.4.16 Versio n Res ponse .............................................
RTU -292 Operations Manual List Of Figures F IGURE 2-1 O UTLINE D IMENSIONS ................................................................................................................... 2-18 F IGURE 2-2 C ONTROL AND C ONNECTOR L OCATIONS .......
RTU-292 Operations Manual List of Tables T ABLE 1-1 E QUIPMENT AND A CCESSORIES S UPPLIED .................................................................................... 1-4 T ABLE 1-2 O PTIONAL E QUIPMENT - N OT S UPPLIED .......................
RTU -292 Operations Manual Glossary Adaptation The process where by the RTU-292 DSP algorithms detect refl ected signal inform ation in a connected line and tune the DSP hybri d for a broad band null wit h minim um reflection.
RTU-292 Operations Manual This page intentionally left blank. JPS Comm unications, Inc. 10.
RTU -292 Operations Manual 1 General Information 1.1 SCOPE This instruction manual provides the informati on necessary to install, operate, repair and maintain the RTU-292 Radi o/Telephone Interface.
RTU-292 Operations Manual automatic. The unit will continuously adapt to changing line conditio ns, making operation insensitive to line impedance changes. In the Automated Operations mode, the RTU-292 co mbines the un ique feat ures of its adaptive DSP hybrid with fully unmanned auto-dial/aut o-answer capability.
RTU -292 Operations Manual 1.3.1.2 Handset/Speaker Interface The Handset/Speaker Interface Section contains the sp eaker pre-amp and driver, the headphone pre-amp and driver. Audio gates controlled by the front panel sw itches route the au dio to the speaker and handset microphone preamplifier and ALC (Automatic Level Control) circuit.
RTU-292 Operations Manual Table 1-1 Equipment and Accessories Supplied Qty Part Number Item 1 5970-60000 0 RTU-292 Standard 1 5970-600 200 Operation & M aintenance M anual 1 5970-600150 Accessory Kit Accesso ry Kit Consis ts of: Q t y Par t Number Item 1 0150-2000 00 Handset, PTT, black 1 0313-037770 Cable, misc.
RTU -292 Operations Manual 1.3.4 OPTIONS RTU-292 options include the: The Voice Prompt Option, which gives verbal prompts to the user as an aid in all aspects of unit operation; The Local Phone Option.
RTU-292 Operations Manual Table 1-3 RTU-292 SPECIFICATIONS TELEPHONE LINE INTERFACE (J2, Male DB-9 Connector) Output & Input Levels to Phone Line Nominally -12 dBm. (Adjustable -21 to 0 d Bm in 3 dB steps). Frequency Re sponse + 2 dB, 300 to 3 200 Hz.
RTU -292 Operations Manual 2 Installation 2.1 GENERAL This section provides the instructions for unpack ing, inspection, installation and set-up. Also included are directions for reshipment of damaged parts or equipm ent.
RTU-292 Operations Manual Mark all sides of the package: FRAGILE - ELECTRONIC EQUIPMENT Inspect the package prior to shipment to be su re it is properly m arked and securely wrapped. 2.4 INST ALLA TION OVERVIEW Follow these four steps to properly install the RTU-292: 1.
RTU -292 Operations Manual Table 2-1 RTU-292 Factory Default Settings This table describes the settings of all RTU-292 internal adjustm ents and switch positions as set when the unit is shipped.
RTU-292 Operations Manual 2.6 POWER REQUIREMENTS The RTU-292 is designed to operate from 115 V or 230V, 47 to 63 Hz, single phase AC power source. The unit will meet all of its specifications over a voltage range of + 15% from nominal. Power consumption is 20 VA typical, 50 VA maximum.
RTU -292 Operations Manual and +28 VDC (nominal) supplies. The unit will au tom atically switch over to the use of the DC input when the AC source drops too low or is no t available. Slide switch S6 on the Main Board is used to select either +12 or +24/+28 VDC opera tion.
RTU-292 Operations Manual Table 2-2 Recommended Phone Line Settings Type of System Send & Receive Levels Dial-Up lines in a U.S. Domestic phone system -9 dBm Dial-Up lines in most non-U.S. telephone systems -9 dBm PBX Systems -12 dBm Field Wire not connected to a telephone network -6 dBm When using the RTU-292 in a domestic U.
RTU -292 Operations Manual 2.8.3 VOX HANGTIME The RTU-292 VOX circuitry holds the radio in the keyed state for a short time after the telephone audio signal is no longer detected. Th is delay, called hangtime, ensures that the VOX is not de-activated between syllables or during short pauses in speech.
RTU-292 Operations Manual 2.8.6 RX LINE INPUT IMPEDANCE The factory setting for the Receive Line inpu t impedance is 600 Ohms, but if a high input impedance for bridging is needed, the impedan ce may be set to approximately 47k Ohm .
RTU -292 Operations Manual Table 2-7 Full/Half Duplex SW2-8 Full/Half Duplex Off Full Duplex On Half Duplex * 2.8.10 SERIAL PORT BAUD RATE Internal dipswitches SW1-1 a nd SW1-2 on the Main board conf igure the RS-232 baud rate of the unit's serial port as sh own in the table below.
RTU-292 Operations Manual 2.8.12 PASSWORD PROTECTION Dipswitch SW1-5 enables or disables the RT U-292's password protection feature. Password protection prevents unauthorized access to the system from the PSTN line when the RTU-292 is in the Automated Operation Mode.
RTU -292 Operations Manual Table 2-12 Local Phone Enable SW1-7 Local Phone Off Disabled On Enabled Table 2-13 Local Phone Ringthrough SW1-8 Ringthrough Off Disabled * On Enabled 2.8.15 TRANSMIT LEVEL SET-UP MODE Dipswitch SW2-7 is used by the factory to enab le a special set-up m ode .
RTU-292 Operations Manual 2.9.1 TELEPHONE CONNECTION Connect the telephone line to the PHONE J1 RJ 11C standard modular connector. The unit will work with either an AC or DC telephone line. Telephone line pol arity is not important. Note that the phone connections are repeated at the te rminal block on the rear panel for convenience.
RTU -292 Operations Manual Table 2-16 P1-RADIO (DB-9 Male) Pin Function 1 Balanced Receive Audio Input B 2 Chassis Ground 3 Transmit Audio Output A 4 External Signal Input 5 /Key Output A (Relay Closure to Ground) 6 Receive Audio Input A 7 Transmit Audio Output B 8 /Rem ote Key Input 9 /Key Output B (Relay Closure to Ground) 2.
RTU-292 Operations Manual 2.9.4 TERMINAL BLOCK The terminal block on the rear panel is suppl ied for convenience when interfacing the RTU-292 to a communications system. The term inal bloc k connections are in parallel with the I/O terminals of the same nam e found on different c onnectors.
RTU -292 Operations Manual 2.9.5 RS-232 CONNECTION Use P2 on the rear panel to connect to the RT U-292 RS-232 interface. RS-232 control is fully explained in section 5.
RTU-292 Operations Manual 2.10.1.2 Adjust TX Level Adjust so that the transmitter is just fully modulated. If the transmitter is AM or SSB, use its output power meter (if available) to determine the amount of m odulation. Do this by advancing R133 clockwise just until the power meter stops rising.
RTU -292 Operations Manual occasionally on voice peaks. Note that the PE AK indicato r responds only to incom ing radio audio, not telephone audio. The range of the RX Level Adjust control is abou t -40 dBm to +10 dBm.
RTU-292 Operations Manual Figure 2-1 Outline Dimensions JPS Comm unications, Inc. 2-18.
RTU -292 Operations Manual Figure 2-2 Control and Connector Locations JPS Comm unications, Inc. 2-19.
RTU-292 Operations Manual Figure 2-3 Location Of Internal Option Settings JPS Comm unications, Inc. 2-20.
RTU -292 Operations Manual Figure 2-4 Internal Option Setting Details JPS Comm unications, Inc. 2-21.
RTU-292 Operations Manual Figure 2-5 Audio Interface Wiring Diagram JPS Comm unications, Inc. 2-22.
RTU -292 Operations Manual Figure 2-6 Interface Details JPS Comm unications, Inc. 2-23.
RTU-292 Operations Manual 2.11 INST ALLA TION CHECKLIST Table 2-20 Installation Checklist Provide suitable Mounting and Cooling. See Section 2.5. Check AC Line voltage selection. See Section 2.7. DC Operation nee ded? See Section 2.7. Make Interconnections.
RTU -292 Operations Manual 3 Operation 3.1 GENERAL This section contains information and instruct ions required for prope r operation of the RTU- 292. 3.2 FRONT P ANEL CONTROLS, I NDICA TORS AND CONNECTORS 3.2.1 MAIN POWER SWITCH The Main Power switch controls th e external DC power to the unit.
RTU-292 Operations Manual 3.2.6 KEYPAD The 12-key keypad is used for te lephone dialing. It is active only when the TEL LINE/PHONE path is selected. Dialing may be either via DTMF m ode or pulse mode as determined by internal dipswitch selection. 3.2.
RTU -292 Operations Manual 3.2.11 SPEAKER BUTTONS These two buttons, SPEAKER/PHONE and SPEAKER /RADIO, determine whether the speaker monitors telephone receiv e audio, rad io receive audio, or both. Note that if a radio-to- telephone call is underway and both buttons ar e pressed, the full conversation is being monitored.
RTU-292 Operations Manual 3.3 REAR P ANEL CONNECTORS Accessible at the RTU-292 rear panel are the radio connector, telephone line and local phone connector, the signal terminal block, the DC po wer terminal block, an RS-232 connector, and the AC power connector/voltage selector/fuse hol der assembly.
RTU -292 Operations Manual 3.4 OPERA TION 3.4.1 OPERATION OVERVIEW The RTU-292 is a flexible piece of equipment that contains a telepho ne and a radio/telephone interface circuit with a unique adaptive hybrid. Thes e circui ts are arranged so that they can be used together or independently in several diffe rent ways.
RTU-292 Operations Manual 3.4.4 RECEIVING A TELEPHONE CALL NOTE The handset-to-telephone path may be lef t in the enabled condition (HANDSET/PHONE LED ON) even when the unit is not connected to the telephone line. Only one button (TEL LI NE/PHONE) must then be pushed to answer the telephone.
RTU -292 Operations Manual noise source is switched off, the LED is lit continuously, and the unit is ready for operation. This adaptation procedure normally takes less than one second.
RTU-292 Operations Manual 3.4.8.3 Once the telephone and radio party have both b een contacted, the operator should advise the telephone party that a phone patch is being set up. He may want to advise that a short noise burst (not extremely loud) will be heard in the telephone receiver, and that the conversation can proceed following the burst.
RTU -292 Operations Manual 3.4.10 TRANSMITTER KEYING, FULL DUPLEX SYSTEM In a full duplex system, the transmitter can be held continuously keyed during a conversation, because the system can receive and transmit at the same tim e. Thus, VOX is not required.
RTU-292 Operations Manual 3.7.1.3 Waiting For Input (QUERY) When the RTU-292 needs user input it will play 1 short low-pitched tone followed by 1 short high pitched tone. A QUERY is played whenever the user needs to enter som e data such as a password or telephone number.
RTU -292 Operations Manual The following paragraphs describe the sequence of operation s used to automatically p lace a call through the RTU-292 to a radio via the outside phone line. This description assumes that the RTU-292 has a Voice Prompt Option installed.
RTU-292 Operations Manual 3.7.3.4 The RTU-292 Enters the COMMAND Mode After the RTU-292 completes the adaptation seque nce, it enters the Command Mode and waits for the caller to respond with commands. In Command Mode the user may enter DTMF commands by pressing a number on the telephone’s keypad.
RTU -292 Operations Manual the unit signals that it is droppi ng the link due to a lack of act ivity, either party may prevent the disconnection by speaking within five seconds. 3. Pressing the OFF button on the fron t panel of the RTU-292 will also cause the system to disconnect.
RTU-292 Operations Manual Table 3-1 Standard DTMF Operational Commands These commands may be entered by the RTU-292 front panel keypad, or by the keypad of a connected telephone or by a telephone set wire d to the Local Phone Option. See 3.7.6 for special instructions regarding the use of the front panel keypad to send DTMF Commands.
RTU -292 Operations Manual Table 3-2 Programming Mode DTMF Commands These commands may be entered by the RTU- 292 front panel keypad*, or by the keypad of a connected telephone or by a telephone set wired to the Local Phone Option. The unit must be put into the programming m ode by entering *99 before these commands can be executed.
RTU-292 Operations Manual 3.7.7 RTU-292 PASSWORD PROTECTION The password protection f eature is enabled by a dipswitch setting (SW1-5, see Table 2-1). When passwords are enabled, acce ss to the system is denied unless a user enters the correct password.
RTU -292 Operations Manual 3.7.10 USING THE RTU-292 SPEED DIAL FEATURE The RTU-292 has the ability of storing 99 telephone numbers in non-volatile mem ory. These numbers may be used when making a call using via UHF/VHF radio with a DTMF keypad. To use the speed dial feature, simp ly enter the speed dial number instead of a telephone number.
RTU-292 Operations Manual 3.7.11 OPTIONAL 4 WIRE OPERATION The unit can be set to operate with a four wire device instead of a standard 2 wire phone. The additional I/O is handled by header J6 on the ma in PCB. The STU-III option makes use of this capability.
RTU -292 Operations Manual 4 R TU-292 Theory Of Operation 4.1 GENERAL This section gives enough detail of the theo ry of operation of the RTU-292 audio and power supply sections to allow them to be troubleshot in the field.
RTU-292 Operations Manual 4.3.2 TELEPHONE INTERFACE CIRCUITS 4.3.2.1 Telephone Send Circuits Amplifier U1B generates the Telephone Send si gnal (the audio which is sent down the phone line from the RTU-292).
RTU -292 Operations Manual the signal at A/D 2 from that at A/D 1 and the difference appears on D/A 1, which is named TEL after passing through gate U8C. 4.3.2.3 Ring Detector and Tone Ringer Integrated circuit U7 is an opt ocoupler that senses the ring volta ge on the telephone line.
RTU-292 Operations Manual 4.3.3.4 DTMF Detector Circuit U25 is a DTMF detector/decoder dedicat ed to listening for DTMF signals from the radio. Its input is connected to the leveled radi o receiv e signal at U20B-7. The DTMF data is read by the processor.
RTU -292 Operations Manual 4.3.6.1 Adaptive Hybrid The adaptive hybrid is the centr al function of the RTU-292. Its purpose is to separate and isolate the telephone receive signal by subtr acting the telephone send signal from the m ixed telephone send and receive signals.
RTU-292 Operations Manual 4.3.7 POWER SUPPLY The power supply is detailed in page 8 of 9, Fi gure 8-2. It supplies re gulated DC voltages of +5V, +12V, -5V, and -12V from both AC and DC inputs.
RTU -292 Operations Manual Bus drivers U60 and U61 are the input devices for the front pa nel switches; latches U62 and U63 light the front panel LEDs. Latches U50 through U53 send control signals mainly to the audio circuit sections. U56 a nd U57 send inputs to the data bus; U54 and U55 read Option switches SW1 and SW2.
RTU-292 Operations Manual 4.5.3 VOICE PROMPT SOFTWARE The voice prompt board software receives th e prompt number comm and through J1 and translates it into the prompt address in EPROM U5. 4.6 LOCAL PHONE OPTION The Local Phone Option allows a standard teleph one set to be plugged into an RJ-11C modular jack at the rear of th e RTU-292.
RTU -292 Operations Manual 5 Remote Contr ol Protocol 5.1 GENERAL Included in this sectio n are instructions for controlling the RTU-292 via its RS-232 serial communications port. The protocol listed in this section is the standard comm and set that accompanies the standard software version.
RTU-292 Operations Manual When a command is sent to the RTU-292 it is buffe red up and acted on as soon as possible. Once the command has been executed, the RTU-292 will return a "Status" resp onse. The format of this status response is explained in greater detail in the sec tion 5.
RTU -292 Operations Manual 5.3.1 NULL Command <CR> This command may be used as a qui ck way to insure that RS-232 communication with the RTU-292 is functioning. The command has no param eters. Expected Response: NULL Respo nse. Example: <CR> ; Command sent to the RTU-292.
RTU-292 Operations Manual 5.3.4 Date Command DATE <ddmmyy > <CR> This command is used to check or set th e date on the RTU-292 internal clock. If no parameters are given the command simply return s the time/date. The parameter format is day (01-31), mont h (01-12), year (00-99).
RTU -292 Operations Manual 5.3.6 Disconnect Command DISC <CR> This command is used to drop the PSTN connectio ns. Expected Response: Disconnect Response. Examples: DISC <CR> ; Command requesting that the PSTN be disconnected. %DISC E0 <CR> ; Status returned indicating that the PSTN was disconnected.
RTU-292 Operations Manual 5.3.8 Handset Phone Command HS_PH <ON|OFF|?> < CR> This command is to enable , disable or query the current status of Handset Phone Expected Response: Handset Phone Respon se. Examples: HS_PH ON <CR> ; Command to enable the Handset Phone path.
RTU -292 Operations Manual 5.3.10 Speaker Phone Command SPKR_PH <ON|OFF|?> <CR> This command is to enable , disable or query the current status of the Speaker Phone path. Expected Response: Speaker Phone Respon se. Examples: SPKR_PH ON <CR> ; Command to enable the Speaker Phone path.
RTU-292 Operations Manual 5.3.12 Speed Dial Command SD <nn|ALL > <num|.|?> <CR> This command is used to program o r review data in speed dial mem ory. There are 99 locations in speed dial memory. These range from 1 to 99, with location 0 being used by the system as “scratch pad” memory.
RTU -292 Operations Manual 5.3.13 Tel-Line Phone Command TEL_LINE_PH <ON|OFF|?> <CR> This command is to enable , disable or query the curr ent status of Tel-Line Pho ne. Note that enabling Tel-Line Phone will put the PSTN in an Off-Hook stat us.
RTU-292 Operations Manual 5.3.15 Time Command TIME <hhmmss> <CR> This command is used to check or set th e time on the RTU-292 internal clock. If no parameters are given the command simply return s the time/date. T he parameter format is hour (00 -23), minutes (00- 59), seconds (00-59 ).
RTU -292 Operations Manual 5.4 ST A TUS RETURNED FROM THE R TU-292 The following section describes the various resp onses the user may expect from the RTU-292.
RTU-292 Operations Manual 5.4.1 NULL Response % Exx <CR> Type: Synchronous. Response To: NULL Command. This response is given after receiving a NUL L command. No data is returned in the response . Example: <CR> ; Command sent to the RTU-292.
RTU -292 Operations Manual 5.4.4 Dial Response %DIAL <OPER|LP|numb er string> Exx <CR> Type: Synchronous. Response To: Dial Command. This response indicates that the given number was di aled. Valid digits for the number string are '0 '-'9', the characters * # and ','.
RTU-292 Operations Manual 5.4.7 Elapsed Time Response %Connection dropped, elapsed time: hh:mm:s s Exx <CR> Type: Asynchronous. Response To: Completion of a Radio/Telepho ne call. This response indicates that a Radio/Telephone ca ll has been terminated.
RTU -292 Operations Manual 5.4.10 Speaker Phone Response %SPKR_PH <ON|OFF> Exx <CR> Type: Synchronous. Response To: Speaker Phone Command. This response indicates the Speaker Phone path status. Examples: %SPKR_PH ON E0 <CR> ; Status indi cating that the Speaker Phone path is enabled.
RTU-292 Operations Manual 5.4.12 Speed Dial Response %SD <nn> <num|”is empty .”> Exx <CR> Type: Synchronous. Response To: Speed Dial Command.
RTU -292 Operations Manual 5.4.15 Time/Date Response %dd-MON-yy hh:mm:ss <CR> Type: Synchronous. Response To: TIME or DATE Command. This response indicates the current Time and Date for the RTU-29 2 internal clock. Note: the Call Logging Feature must be enabled before use.
RTU-292 Operations Manual 5.5 CALL PROGRESS RESPONSES FROM THE R TU-292 The following section describes the responses the user may expect from the RTU-292 when Call Progress is active. Ca ll progress is active whenev er the PSTN is “off-hook”. Table 5-3 Call Progress Responses %CP_RING Exx <CR> Call Progress detects Ringback.
RTU -292 Operations Manual 6 Maintenance and Repair 6.1 GENERAL Included in this section are the Test Procedur es and performance evaluation criteria for the supplied equipment. Also provided is a Fault Analysis Table (Table 6.1) to aid in isolating a fault.
RTU-292 Operations Manual 6.5.2 HYBRID BALANCE MEASUREMENT The test procedure outlined below allows measurem ent of the hybrid balance, or trans-hybrid loss, attainable with the RTU-292. This charac teristic determines how much radio receiver input signal will leak into the transmitter output of the RTU-292.
RTU -292 Operations Manual Figure 6-1 Hybrid Balance Test Set-Up 6.5.2.1 Main Hybrid Test Procedure 1. Disconnect the RTU-292 from al l other equipm ent and connect the test equipment as shown in Figure 6.1. 2. Set the PSTN levels for -9 dBm using Option SW 2-1, -2, and -3.
RTU-292 Operations Manual 6.5.2.2 Alternate Hybrid Test Procedure This alternate test procedure uses a more easil y obtainable audio signal generator in place of the noise generator.
RTU -292 Operations Manual 6.5.3 VOX SENSITIVITY MEASUREMENT The following test procedure measure the sensit ivity of the VOX in the RTU-292. This is the amplitude of the incoming signal from the te lephone line required to trigger the VOX. Figure 6-2 VOX Sensitivity Test Set-Up 6.
RTU-292 Operations Manual Table 6-1 Fault Analysis No LEDs light after power-up C heck for correct setting of DC voltage swi tch S6. Check for proper polarity of DC input. (If polarity is reversed, the unit will not be damaged, but will no t operate. At power-up, the PEAK LED flashes at a steady rate and the unit does not f unction properl y.
RTU -292 Operations Manual Table 6-2 Replaceable Parts List 5970501000 Chassis Assembly Part No. Description Reference Designator 153080001 Speaker, 8 ohm, 3" sq LS1 360003001 Conn, MTA-156, 3-pin, receptacle For P4 362005001 Conn, circular, pnl mt receptacle J1 362007000 Conn, cable, 7-pin, AMP P8, Keypad conn 362008000 Conn, cable, 8-pin.
RTU-292 Operations Manual 5970506100 RTU-292 Main PCB Assembly Part No. Description Reference Designator 320010500 Cap, elect, 1uF, 50VDC C103 320020500 Cap, elect, 2.
RTU -292 Operations Manual 5970506100 RTU-292 Main PCB Assembly (continued) Part No. Description Reference Designator 933074154 IC, dig, 74HC154N, 4:16 decoder U43,44 933074244 IC, dig, 74HC244N, 3-st.
RTU-292 Operations Manual 5970506100 RTU-292 Main PCB Assembly (continued) Part No. Description Reference Designator 1820912000 Resistor, carb, 1/4w, 9100 ohm R3,5,28,29 1821102000 Resistor, carb, 1/2w, 1000 ohm R207 1826020000 Resistor, Varistor, RMS200V RV1 1827400050 Resistor, ww, 5W, 40 ohm R203,204,205,206 1828759030 Resistor, pwr ox, 3W, 7.
RTU -292 Operations Manual 7 R TU-292 Options 7.1 GENERAL Included in this section are in stallation instructions for fiel d installable RTU-292 options and set-up instructions for all options that have c onfiguration dipswitches, jumpers, potentiometers, etc.
RTU-292 Operations Manual 7.2 V OICE PROMPT OPTION When the Voice Prompt Option is installed, th e RTU-292 will send h elpful prompts to system users to guide them in proper system operation a nd inform them of the current syst em status.
RTU -292 Operations Manual Figure 7-1 Voice Prompt Option Installation JPS Comm unications, Inc. 7-3.
RTU-292 Operations Manual 7.3 LOCAL PHONE OPTION The RTU-292 has an extra rear panel modular phone jack that allows a standard DTMF telephone set to be plugge d directly into the un it when the Local Phone Option is installed.
RTU -292 Operations Manual 7.3.2 LOCAL PHONE OPTION OPERATION When the handset of the local phone is picked up, a sp ecial dial tone, generated by the RTU- 292, will be heard in its receiver.
RTU-292 Operations Manual 7.4 VMM-100 OPTION The VMM-100 VMR Module implements Voice Modu lation Recognition (VMR) which enables the receive audio path when speech is present and disables it when speech is not present. This module also implements a form of noise reduction known as "dynamic peaking" which reduces background white noise.
RTU -292 Operations Manual 7.4.2 VMM-100 Software The VMM-100 DSP software can provide voice modulation recognition, noise reduction, or both. The module's operating mode is se t by logic inputs at P 9 pins 3 and 4 7.
RTU-292 Operations Manual The dipswitches on the VMM-100 module may be ch anged at any tim e dur ing operation; the DSP is constantly checking the states of thes e switches. The VMR and Noise Reduction modes can be used individually or simultaneously.
RTU -292 Operations Manual Table 7-6 VMM-100 SPECIFICATIONS GENERAL Frequency Response 100 to 3400 Hz +/- 2dB Input Level 0 dBm nominal Input Impedance Unbalanced 10k Ohm DSP Output Delay < 10mS No.
RTU-292 Operations Manual Table 7-7 VMM-100 I/O CONNECTOR INFORMATION (P9) Pin Signal 1 Audio Input (see specs above) 2 Audio Output (see specs above) 3 NR1; Logic Input; Low selects DSP Noise Reducti.
RTU -292 Operations Manual 7.5 DTMF ACCESS OPTION This option allows a radio user to use his DT MF keypad to quickly place a telephone call via the RTU-292.
RTU-292 Operations Manual If the number is busy, the busy tones will b e broadcast for approximately 5 seconds before the RTU-292 terminates the call attempt. Once the RTU-292 detects ringbac k, the RTU-292 begins a 30 sec ond timer and waits for the call to be answered.
RTU -292 Operations Manual 7.6 SQUELCH BREAK ACCESS OPTION This option allows a radio user who does not have DTMF capability to quickly place a telephone call via the RTU-292. The radio user simp ly transmits a series of squelch breaks and is then automatically connected to the telephon e at the RTU-292 speed dial location #01.
RTU-292 Operations Manual as a warning. The radio caller or the phone user may initiate ac tivity within 5 seconds of the warning beeps to reset the timer. If neither user does so, the u nit will then terminate the call. To terminate the call at any time, the radio user may enter * # or give three squelch breaks within four seconds.
RTU -292 Operations Manual 7.8 RADIO CONTROL OPTION When this software option is enabled, the RT U-292 may be used to control a Motorola URC- 200 radio connected to the unit via the RS-232 serial port.
RTU-292 Operations Manual While the operator is using the keypad to c ontro l the RTU-292, the unit will not be available for: • PSTN Auto Answering. • Radio Squelch Break Access Operation. • Radio DTMF Access Operation. • Local Phone Control.
RTU -292 Operations Manual 8 SCHEMA TIC DIAGRAMS 8.1 GENERAL This section has all RTU-292 schematic diagrams. They include: Figure 8-1 Front Panel Schematic A single sheet showing the switch boards and other front panel components. Figure 8-2 Main Board Schematic This nine page schematic details all compone nts on the main board.
RTU-292 Operations Manual Blank Page JPS Comm unications, Inc. 8-2.
RTU -292 Operations Manual 9 Index * C * #....................................................................... 3- 14, 3-15 Call Begins ......................................................... 7-12, 7-13 * 0.........................................
RTU-292 Operations Manual DTMF Detector .................................................. 4-22, 4-23 INACTIVITY DISCONNE CT TIMER ...................... 3-16 DTMF Genera tor......................................................... 4-23 Initial Adapta tio n .
RTU -292 Operations Manual PTT .................................................................................10 Maintenance an d Repair ................................................ 6-1 MANUAL PH ONE PATCH PRO CEDURE................. 3-7 PUTTING A TELEPHONE CALL ON HOL D .
RTU-292 Operations Manual Speaker Phone Response ............................................. 5-15 Speaker Radio C ommand .............................................. 5-7 Speaker Radio Response ............................................. 5-15 Speaker Switch As sembly .
An important point after buying a device JPS Communications RTU-292 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought JPS Communications RTU-292 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data JPS Communications RTU-292 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, JPS Communications RTU-292 you will learn all the available features of the product, as well as information on its operation. The information that you get JPS Communications RTU-292 will certainly help you make a decision on the purchase.
If you already are a holder of JPS Communications RTU-292, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime JPS Communications RTU-292.
However, one of the most important roles played by the user manual is to help in solving problems with JPS Communications RTU-292. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device JPS Communications RTU-292 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
