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RTU

-292 Operations Manual

6.5.3 VOX

SENSITIVITY

MEASUREMENT

The following test procedure measure the sensitivity of the VOX in the RTU-292. This is the
amplitude of the incoming signal from the telephone line required to trigger the VOX.

Figure 6-2

VOX Sensitivity Test Set-Up

6.5.3.1 VOX Test Procedure

1. Disconnect the RTU-292 from all other equipment and connect the test equipment as shown
on Figure 6.2.
2. The PSTN level setting must be known. To determine this, remove the top cover and note
the positions of SW2-1, -2, and -3.
3. Start with the following pushbuttons OFF: TEL LINE/PHONE and TEL LINE/RADIO.
Push the TEL VOX button ON. The positions of the other buttons are unimportant.
4. Set the audio signal generator frequency to 1 kHz with an output amplitude of less than -
40dBm (7.7mV rms).
5. Push the TEL LINE/RADIO button to start the adaptation cycle.
6. When the initial adaptation cycle is complete, slowly increase the audio generator amplitude
until the Keyed LED on the RTU-292 comes on. The audio generator amplitude at this point
(read directly by the audio voltmeter) is the VOX sensitivity. The VOX trip point is dependent
on the setting of the PSTN levels and the VOX sensitivity setting.  It should be 16 + 2 dB
below the PSTN setting as listed in the table below:

VOX Sensitivity

VOX Trip Point

MAX

19 + 2 dB below the PSTN setting

MED

16 + 2 dB below the PSTN setting

LOW

13 + 2 dB below the PSTN setting

MIN

10 + 2 dB below the PSTN setting

JPS Communications, Inc.

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Summary of Contents for RTU-292

Page 1: ...on 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 ...

Page 2: ... its option upon return of the equipment shipping prepaid to the JPS facility in Raleigh North Carolina USA This warranty does not apply to damage caused by accidents abuse or improper installation NO OTHER WARRANTY EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL APPLY NOTICE JPS Communications Inc reserves the ...

Page 3: ...IVE LEVELS 2 5 2 8 3 VOX HANGTIME 2 7 2 8 4 VOX SENSITIVITY 2 7 2 8 5 BALANCED UNBALANCED RADIO INTERFACE 2 7 2 8 6 RX LINE INPUT IMPEDANCE 2 8 2 8 7 DIAL MODE 2 8 2 8 8 TELEPHONE RING VOLUME 2 8 2 8 9 FULL HALF DUPLEX RADIO 2 8 2 8 10 SERIAL PORT BAUD RATE 2 9 2 8 11 RADIO CONTROL MODE 2 9 2 8 12 PASSWORD PROTECTION 2 10 2 8 13 VOICE PROMPTS 2 10 2 8 14 LOCAL PHONE LOCAL PHONE RING THROUGH 2 10 2...

Page 4: ... USE OF THE RTU 292 SPEAKER TO MONITOR AUDIO 3 5 3 4 3 PLACING A TELEPHONE CALL 3 5 3 4 4 RECEIVING A TELEPHONE CALL 3 6 3 4 5 PUTTING A TELEPHONE CALL ON HOLD 3 6 3 4 6 USING THE HANDSET WITH THE RADIO 3 6 3 4 7 CONNECTING THE RADIO TO THE TELEPHONE LINE 3 6 3 4 8 MANUAL PHONE PATCH PROCEDURE 3 7 3 4 9 TRANSMITTER KEYING HALF DUPLEX SYSTEM 3 8 3 4 10 TRANSMITTER KEYING FULL DUPLEX SYSTEM 3 9 3 5 ...

Page 5: ...ommand 5 3 5 3 2 Auto Answer Command 5 3 5 3 3 Audible Ring Command 5 3 5 3 4 Date Command 5 4 5 3 5 Dial Command 5 4 5 3 6 Disconnect Command 5 5 5 3 7 DTMF Command 5 5 5 3 8 Handset Phone Command 5 6 5 3 9 Handset Radio Command 5 6 5 3 10 Speaker Phone Command 5 7 5 3 11 Speaker Radio Command 5 7 5 3 12 Speed Dial Command 5 8 5 3 13 Tel Line Phone Command 5 9 5 3 14 Tel Line Radio Command 5 9 5 ...

Page 6: ...7 6 7 4 1 VMM 100 Hardware 7 6 7 4 2 VMM 100 Software 7 7 7 4 3 VMM 100 INSTALLATION AND CONFIGURATION 7 7 7 5 DTMF ACCESS OPTION 7 11 7 5 1 Initiate Call Via Attention Signal 7 11 7 5 2 RTU 292 Response to Attention Signal 7 11 7 5 3 Radio Caller Provides Calling Directions 7 11 7 5 4 RTU 292 Plays Back Phone Number Prompts for Confirmation 7 11 7 5 5 RTU 292 Places the Call 7 11 7 5 6 After the ...

Page 7: ...23 FIGURE 6 1 HYBRID BALANCE TEST SET UP 6 21 FIGURE 6 2 VOX SENSITIVITY TEST SET UP 6 23 FIGURE 7 1 VOICE PROMPT OPTION INSTALLATION 7 3 FIGURE 7 2 LOCAL PHONE OPTION INSTALLATION 7 5 FIGURE 7 3 VMM 100 OPTION INSTALLATION 7 8 FIGURE 8 1 FRONT PANEL SCHEMATIC 8 1 FIGURE 8 2 MAIN BOARD SCHEMATIC 8 1 FIGURE 8 3 DSP MODULE 8 1 FIGURE 8 4 OPTION INTERFACE BOARD 8 1 FIGURE 8 5 VOICE PROMPT OPTION BOAR...

Page 8: ...BLE 2 15 J1 TEL LINE RJ 11C 2 12 TABLE 2 16 P1 RADIO DB 9 MALE 2 13 TABLE 2 17 J7 HANDSET RJ12C JACK 2 13 TABLE 2 18 TERMINAL BLOCK 6 POSITION 2 14 TABLE 2 19 P2 RS 232 CONNECTOR DB 9 MALE 2 15 TABLE 2 20 INSTALLATION CHECKLIST 2 24 TABLE 3 1 STANDARD DTMF OPERATIONAL COMMANDS 3 14 TABLE 3 2 PROGRAMMING MODE DTMF COMMANDS 3 15 TABLE 5 1 COMMAND SUMMARY 5 2 TABLE 5 2 RESPONSE SUMMARY 5 11 TABLE 5 3...

Page 9: ...ses different frequencies for transmit and receive operation but can not transmit and receive at the same time See also Full Duplex and Simplex Hangtime A system with hangtime will remain in the transmit mode for the duration of the set hangtime beyond the time indicated by any keying inputs The hangtime prevents transmitter unkey during brief pauses in the transmission Key To key a transmitter me...

Page 10: ...RTU 292 Operations Manual This page intentionally left blank JPS Communications Inc 10 ...

Page 11: ...eive calls the operator can quickly and easily establish a phone patch connection When used in the manual mode the RTU 292 patches a telephone into a radio link by essentially the same method as with a conventional phone patch the quality of the patch however is greatly improved First a radio to radio link is established Then using the telephone in the RTU 292 the operator places a phone call to t...

Page 12: ...11 to 15 VDC while the 24 28 VDC range extends from 22 to 30 VDC It is packaged in a rugged enclosure measuring 3 5 H x 19 W x 12 D All inputs and outputs including those for power are filtered or protected as appropriate to enable the RTU 292 to meet the requirements of FCC Part 15 rules for a Class A Digital Device 1 3 ASSEMBLIES The standard RTU 292 contains five PC board assemblies the main bo...

Page 13: ...e in the DSP section the adaptive hybrid the VOX an audio peak detector the noise generator for measuring the telephone line characteristics an audio delay and the transmit setup tone generator 1 3 1 5 CPU Section This section contains the microprocessor and program software that controls all operations of the RTU 292 Various I O devices read external inputs and the front panel controls The inputs...

Page 14: ...009000 Connector cable DB 9 receptacle 2 0650 005100 Fuse 3AG 1 2A slow blow 2 0650 010100 Fuse 3AG 1A slow blow 2 0827 000001 HW clamp cable for DB 9 connector 1 0827 102401 HW Telephone Hanger may be attached to front panel holes provided 9 0833 063205 HW screw flat head 6 32 x 5 16 100 degrees spares for top cover mounting 5 0837 103200 HW screw truss head 10 32x3 8 for mounting unit front pane...

Page 15: ...ment Not Supplied Item JPS P N Description Depot Spares Kit 5970 691000 Spares for 3 to 5 RTU 292s Spare PC Board Kit 5970 692000 Spare Boards for 1 unit Spare Parts Kit 5970 693000 Spares for one RTU 292 Local Phone Option 5930 596000 Allows remote operation of the RTU 292 through the use of a standard telephone set connected directly to the RTU 292 Local Phone port Telephone set and cable not su...

Page 16: ... to 3200 Hz 2 dB Key Relay Output Low Level Relay Contacts 60VA max Switching Speed 5 msec TELEPHONE Handset RJ12C Jack Electret microphone dynamic receiver Dialing Modes DTMF Pulse at 10 pps Pulse Dial Make Break Ratio 40 60 Dialing Keypad 3x4 Standard Telephone Layout GENERAL Microphone Interface ALC Automatic Level Control with 30 dB dynamic range Headphone Interface Drives high medium or low i...

Page 17: ...on JPS will arrange for repair or replacement of the equipment 2 3 RESHIPMENT OF EQUIPMENT If it is necessary to return the equipment to the manufacturer a Returned Material Authorization RMA number must first be obtained from JPS This number must be noted on the outside of the packing carton and on all accompanying documents When packing the unit for reshipment it is best to use the original pack...

Page 18: ... in a cabinet with other heat generating equipment the use of a rack blower is suggested to keep the cabinet interior temperature rise to a minimum NOTE Before actually installing the unit read Section 2 8 to determine if any internal configuration options must be changed that would necessitate removal of the unit s top cover The RTU 292 Radio Telephone Interface is designed to be mounted in a sta...

Page 19: ...ex SW2 8 Half Duplex RX Audio Interface JP1 JP2 600 Ohms Balanced TX Audio Interface JP3 600 Ohms Balanced R156 Ring Volume Midrange R116 RX Lvl Adj 0 dBm input Internal Audio Potentiometers R133 TX Lvl Adj 0 dBm output Serial Port Baud Rate SW1 1 2 9600 Baud Spare SW1 3 Off Password Protection SW1 5 Disabled Voice Prompts Enable SW1 6 Enabled if Option Installed Local Phone Enable SW1 7 Enabled i...

Page 20: ...ne power module located on the rear panel indicates the nominal line voltage range in the following manner 100 or 120 position nominal 115V operation 220 or 240 position nominal 230V operation The number will be easier to see if the clear fuse cover is slid to the left with the line cord removed To change the voltage selection remove the line power cord and slide the clear plastic fuse cover to th...

Page 21: ...ips head screws around its edges NOTE Many of the RTU 292 s operating parameters are set by internal eight position dipswitches SW1 and SW2 These switches are read by the RTU 292 microprocessor only when the unit power is turned on To change any dipswitch controlled parameter turn off the RTU 292 change the switch setting s and then turn the unit power back on 2 8 1 PROGRAMMING MODE SETUP PARAMETE...

Page 22: ... NOT increase performance but will result in distortion crosstalk into other circuits and the telephone company may disconnect the call When operating into a PBX system the level should be set at 12 dBm Higher levels than these may be only used into field wire or dedicated or private lines which are KNOWN to accommodate higher levels The send and receive levels are set by SW2 1 2 3 as follows Fact...

Page 23: ...medium factory setting and maximum A higher setting will be more able to detect weak or noisy voice signals but will be more likely to false on ambient noise entering the telephone handset A lower setting will do the opposite SW2 4 and SW2 5 control the unit s VOX Sensitivity levels Table 2 5 VOX Sensitivity SW2 4 SW2 5 VOX Sensitivity Off Off Min On Off Low Off On Med On On Max 2 8 5 BALANCED UNB...

Page 24: ...e pulse dialing mode Table 2 6 Dial Mode SW1 4 Dial Mode Selection Off DTMF On Pulse 10 pps 2 8 8 TELEPHONE RING VOLUME The telephone ringer volume may be set to a comfortable level with internal adjustment R156 If the ambient noise level in the RTU 292 s location makes it necessary to change the ringer volume rotate R156 clockwise to increase the volume and counterclockwise to decrease it 2 8 9 F...

Page 25: ...aud Rate SW1 1 SW1 2 Baud Rate Off Off 300 On Off 1200 Off On 4800 On On 9600 2 8 11 RADIO CONTROL MODE Dipswitch SW1 3 enables the RTU 292 to be put into the Radio Control Mode via one of its DTMF commands In this mode the RTU 292 can be used to relay radio control commands via its RS 232 port to a companion Motorola URC 200 radio The factory default disables this mode with SW1 3 set to OFF See a...

Page 26: ...efault setting disabled if the Voice Prompt Option is not installed and enabled if it is Table 2 11 Voice Prompts Enable SW1 6 Voice Prompts Off Disabled On Enabled 2 8 14 LOCAL PHONE LOCAL PHONE RING THROUGH Dipswitch SW1 7 enables or disables the RTU 292 Local Phone Option This feature should be enabled only if the Local Phone Option is installed The factory setting is Disabled SW1 7 Off if the ...

Page 27: ...lled in the factory as required This explanation is provided in case they are accidentally removed and must be replaced Security Option Jumpers on J5 Unless a Security Option Interface Cable is plugged into J5 on the Main Board jumper plugs must be installed at J5 pins 4 5 and pins 7 8 Option Jumpers on J10 If the Option tray is not installed a jumper must be placed at pins 13 14 of J10 This jumpe...

Page 28: ...interface is extremely flexible and can accommodate a wide variety of sources and loads By making different connections the inputs and outputs may be configured for balanced or unbalanced lines The balanced configuration is the factory default and should be used if possible because it is the most noise immune To change to the receive audio to unbalanced single ended input connect the receive audio...

Page 29: ...tput A Relay Closure to Ground 6 Receive Audio Input A 7 Transmit Audio Output B 8 Remote Key Input 9 Key Output B Relay Closure to Ground 2 9 3 HANDSET CONNECTOR The handset supplied with the RTU 292 is plugged into front panel jack J7 Table 2 17 J7 HANDSET RJ12C Jack Pin Function 1 5V Source 2 Ground 3 Ground 4 Earpiece Audio 5 Mic In 6 PTT Switch JPS Communications Inc 2 13 ...

Page 30: ... Key In 5 Ground 6 Spare See Note Below NOTE In the RTU 282 Pin 6 of the terminal block was the Squelch In input also called External Signal In for use with the Squelch Break feature In the RTU 292 this input has been moved to a more appropriate location pin 4 of the P1 Radio Connector When retrofitting an RTU 292 into an existing RTU 282 installation it s possible to maintain the existing interfa...

Page 31: ... detailed below to set the transmit level First apply TX audio by one of two methods A Use a 1 kHz test tone supplied by the RTU 292 when in the Transmit Level Set Up Mode or B simply speak into the telephone line to supply typical audio to the RTU 292 Next rotate the internal TX Level Adjust R133 so that the transmitter is just fully modulated Either method will set the correct transmit level in ...

Page 32: ...he hybrid null provided by the RTU 292 This is particularly important with a full duplex system which may oscillate if too much level compression is used For best results adjust the TX Level Adjust so that the transmitter is just fully modulated by the test tone or actual phone line audio NOTE If the Transmit Level Set up Mode was used be sure to take the unit out of this mode after set up is comp...

Page 33: ...ll be necessary to adjust the audio output at the radio itself until the correct level is obtained NOTE The proper operation and excellent performance of the RTU 292 will not be obtained if the audio level from the receiver into the RTU 292 is not set correctly Excessive audio will overload the telephone line and equipment causing distortion VOX falsing and poor hybrid operation In addition the te...

Page 34: ...RTU 292 Operations Manual Figure 2 1 Outline Dimensions JPS Communications Inc 2 18 ...

Page 35: ...RTU 292 Operations Manual Figure 2 2 Control and Connector Locations JPS Communications Inc 2 19 ...

Page 36: ...RTU 292 Operations Manual Figure 2 3 Location Of Internal Option Settings JPS Communications Inc 2 20 ...

Page 37: ...RTU 292 Operations Manual Figure 2 4 Internal Option Setting Details JPS Communications Inc 2 21 ...

Page 38: ...RTU 292 Operations Manual Figure 2 5 Audio Interface Wiring Diagram JPS Communications Inc 2 22 ...

Page 39: ...RTU 292 Operations Manual Figure 2 6 Interface Details JPS Communications Inc 2 23 ...

Page 40: ...e 2 1 and Section 2 10 Set Telephone Line Levels if necessary See Table 2 1 and Section 2 8 Are other Factory Default Settings correct for this system See Table 2 1 and Table 3 2 Make necessary changes as explained in sections 2 8 2 10 and 3 7 2 12 OPTIONS INSTALLATION AND CONFIGURATION See section 7 for installation instructions for all field installable options Section 7 also explains how to set...

Page 41: ...t PTT switch is active only when any of the following functions are selected associated LEDs on TEL LINE RADIO HANDSET RADIO or SPEAKER RADIO The PTT switch need not be depressed when communicating with a second party via a PSTN line The handset earpiece audio level is controlled by the HANDSET volume control A convenient hanger for the handset may be attached to the left side of the front panel m...

Page 42: ...ton connects the telephone line to the radio through the DSP adaptive hybrid The unit then starts its adaptation cycle by putting a burst of white noise onto the telephone line When the adaptation cycle is underway the TEL LINE RADIO LED will flash After successful completion of the adaptation cycle this LED will be on continuously indicating that the unit is ready for operation The TEL LINE OFF p...

Page 43: ... Mode and the unit will automatically answer the phone after 2 rings See section 3 7 for a description of the Automatic Operation capabilities of the RTU 292 3 2 14 AUDIBLE RING BUTTON This button determines if the ring from an incoming telephone call will be heard via the RTU 292 s speaker When the Audible Ring mode is enabled the ring signal will be audible in the speaker The ring volume is inde...

Page 44: ...e key relay contacts to the transmitter remote key input signal ground and a spare External Signal Input 3 3 4 J2 LOCAL PHONE CONNECTOR This RJ 11C jack is used to connect a local phone to the unit The Local Phone Option must be installed for this port to be active 3 3 5 P2 RS 232 CONNECTOR This female DB 9 connector provides an interface between the RTU 292 and a radio or a controlling terminal v...

Page 45: ...hs describe the RTU 292 operating modes in detail 3 4 2 USE OF THE RTU 292 SPEAKER TO MONITOR AUDIO 1 To monitor radio receive audio push the SPEAKER RADIO button The associated LED will light 2 To monitor telephone audio push the SPEAKER PHONE button The associated LED will light Either the TEL LINE PHONE or the TEL LINE RADIO LED must be ON indicating that the telephone is off hook or there will...

Page 46: ...the radio party using the handset as described in 3 4 6 3 4 6 USING 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...

Page 47: ...one line the noise burst is not needed again This feature enables the RTU 292 to automatically adapt its hybrid balance to changing line conditions 3 4 8 MANUAL PHONE PATCH PROCEDURE A telephone patch establishes a communications link between a distant radio a local radio interfaced directly to the RTU 292 via the P1 Radio connector and a distant telephone that is connected to the unit via the tel...

Page 48: ...L LINE OFF button to disconnect from the phone line The TEL LINE RADIO and TEL LINE PHONE LEDs will both turn off indicating that the phone is back on hook disconnected 3 4 9 TRANSMITTER KEYING HALF DUPLEX SYSTEM For a normal half duplex radio link it is usual for the VOX in the RTU 292 to key the transmitter The VOX responds to signals from the telephone line and operates the keying circuits when...

Page 49: ...ting prompt Failure of the self test or failure of the DSP module at any time is indicated by a long Negative Acknowledge tone and a constantly blinking PEAK LED The radio connect functions of the unit will not operate although the telephone may continue to operate 3 7 AUTOMATED OPERATION The RTU 292 can patch the telephone line to a radio system completely unattended when in the Automated Operati...

Page 50: ...for a time longer that that set by the Inactivity Timer see Table 3 1 If the unit signals that it is dropping the link due to a lack of activity either party may prevent the disconnection by speaking within five seconds 4 Whenever Line Reversal Reverse Battery Signaling is detected on the phone line 3 7 2 VOICE PROMPTS If the RTU 292 is equipped with the Voice Prompt Option it will prompt the user...

Page 51: ...cess See 3 7 3 4 for instructions related to changing the existing password 3 7 3 3 The RTU 292 Adapts To The Phone Line The RTU 292 hardware has an Adaptive Hybrid that is controlled by a Digital Signal Processor DSP The hybrid matches the RTU 292 to the telephone line and also allows the radio to be keyed automatically by detecting the presence of the caller s voice on the telephone input This V...

Page 52: ...r 3 7 4 PLACING A CALL IN THE COMMAND MODE When a phone call is initiated by the RTU 292 to a distant phone on the outside line and the called party picks up the phone the unit s DSP will immediately execute the adaptation process When it is successful the RTU 292 responds with the READY voice prompt If the DSP could not adapt the RTU 292 gives the VOX UNAVAILABLE prompt informing the recipient of...

Page 53: ...ad 3 7 6 1 OPERATING THE RTU 292 FROM THE FRONT PANEL KEYPAD The RTU 292 can be operated from its front panel to allow the unit to be programmed and if so equipped control a Motorola URC 200 radio When using the front panel the operator uses the handset and keypad To begin front panel operation the user must enter three keypresses The RTU 292 will respond with an Acknowledge tone prompt and the vo...

Page 54: ... 3 will turn it on VMM 100 Option must be installed 4 Security Mode Toggle If Security Mode is on 4 will turn it off If it s off 4 will turn it on Security Device Option must be installed not currently available 5 Page the Operator make a call to the RTU 292 operator at the front panel keypad handset 6 Page the Local Phone Operator this command can obviously made only by a connected telephone and ...

Page 55: ... 1 2 3 4 Program the inactivity disconnect timer based on value of x See 3 7 8 for more information 2 0 Disabled not recommended see 3 7 8 2 1 2 Minutes 2 2 5 Minutes factory default 2 3 10 Minutes 2 4 20 Minutes 2 5 30 Minutes 2 6 45 Minutes 2 7 60 Minutes 2 8 90 Minutes 2 x 2 9 120 Minutes Program the Calling Timer based on the value of x The RTU 292 will attempt to place a call to a telephone u...

Page 56: ... detected for a time equal to the Inactivity Disconnect Timer setting the RTU 292 will notify the users by three short beeps that they have five seconds to respond or the call will be terminated If either the radio user or the PSTN caller initiates activity within 5 seconds of the warning beeps the timer is reset Inactivity Disconnect Timer lengths of 2 minutes to 120 minutes or disabled are avail...

Page 57: ...eypad of a connected telephone See 3 7 6 for special instructions if the front panel keypad is used 2 The RTU 292 gives the prompt ENTER SPEED DIAL LOCATION 3 The user enters two digits for the speed dial location A leading 0 is used for locations 1 9 For example when the user is programming speed dial location number 1 he must enter 01 4 The RTU 292 gives the prompt ENTER PHONE NUMBER 5 The user ...

Page 58: ...e enter to exit the programming mode 3 8 FACTORY RESET It s possible to perform a Factory Reset that will return all user programmable parameters other than the speed dial directory to the initial factory default settings This includes the system password the Inactivity Disconnect and Calling Timers etc To perform a Factory Reset hold the 0 zero key in on the front panel keypad while the main powe...

Page 59: ...utton switches 5V onto its control line when ON and open circuit when OFF Pulldown resistors on each of the control inputs pull the line to ground when its button is OFF The buttons are read by the processor on the Main Board The processor not the pushbuttons controls the unit s audio gates as well as the front panel LEDs 4 3 MAIN BOARD Main Board Circuitry is detailed in Figure 8 2 4 3 1 AUDIO BU...

Page 60: ...ge CR1 corrects the DC polarity so that a positive voltage is always applied to the collector of Q1 eliminating the need to be concerned about the polarity of the phone line Transistors Q1 and Q2 are connected as a constant current load and C3 insures that the load does not respond to audio frequencies so that the load appears as a very high AC impedance in parallel with the transformer secondary ...

Page 61: ...er U20A configured as a high input impedance unity gain amplifier In balanced position Jumper JP2 determines the input impedance of the receiver input In low impedance position R112 is placed across the secondary of T2 to make a 600 ohm termination In high input impedance position R112 is removed from the circuit leaving only the 47k Ohm resistor R113 The output of U20A is fed to amplifier U20B a ...

Page 62: ...tes U18A U18B and U18C and are mixed in amplifier U16A The output on U16A 1 is fed to the top end of the speaker volume potentiometer on the front panel The wiper of the volume pot is fed to the speaker driver U17 through R89 The ring signal from the tone ringer is mixed via R88 so that it bypasses the volume pot Its amplitude is set separately by R156 Headphones and handset signals are selected b...

Page 63: ... bandwidth of the noise assures that the hybrid is adapted over the full audio bandwidth 4 3 6 3 Peak Detector A peak detector monitors the receive audio bus and signals at A D 2 to flash the PEAK LED on audio peaks which exceed 0 dBm This function aids in setting up the RTU 292 with the proper audio levels 4 3 6 4 VOX A VOX Voice Operated Xmit function looks at the output of the adaptive hybrid a...

Page 64: ...C51 If the DC input is 12V this filtered supply feeds the BUS directly via CR34 and supplies 12V around U70 via CR33 It also supplies voltage directly to the inputs of the 5V regulators through CR39 and R213 and through CR40 and R214 If the DC input is 24 28V the BUS is fed through emitter follower Q24 which keeps the bus voltage from rising above about 24V when input voltages of 24V to 32V are us...

Page 65: ...ing built in A D and D A and can be used for recording as well as playback The digitized voice prompts are contained in EPROM U5 which U7 accesses via data bus AD The prompt analog audio is output on U7 28 and is passed through amplifiers U9 and U10 These amplifiers are arranged as a five pole active low pass filter which removes remnants of the 8 kHz sampling frequency from the output audio 4 5 2...

Page 66: ... GENERATORS Dial Busy signals are composed of two tones so a pair of frequency sources U5 and U6 are required Each of these 555 timer ICs provides a square wave output R30 and C10 set the frequency of U5 to 460 Hz The frequency of U6 is 620 Hz when Q2 is off set by R24 and C11 When commanded by the CPU Board Q2 turns on placing C12 in parallel with C11 This cuts the frequency of U6 to 350 Hz The C...

Page 67: ...nds are terminated with a carriage return CR and optionally a line feed LF Status information returned from the RTU 292 will always be preceded by a character and is also terminated by a CR This protocol allows control and monitoring of the RTU 292 via a dumb terminal or a computer program The commands issued to the RTU 292 are not case sensitive 5 3 COMMANDS SENT TO THE RTU 292 The following sect...

Page 68: ...xt command Table 5 1 Command Summary Null Command CR Auto Answer Command AUTO_ANS ON OFF CR Audible Ring Command AUD_RING ON OFF CR Date Command DATE ddmmyy CR Dial Command DIAL OPER LP number string CR Disconnect Command DISC CR Generate DTMF command DTMF number string CR Handset Phone Command HS_PH ON OFF CR Handset Radio Command HS_RAD ON OFF CR Speaker Phone Command SPKR_PH ON OFF CR Speaker R...

Page 69: ...N CR Command to enable Auto Answer AUTO_ANS ON E0 CR Status returned showing that Auto Answer is on AUTO_ANS CR Command requesting the status of Auto Answer AUTO_ANS OFF E0 CR Status returned showing that Auto Answer is not enabled 5 3 3 Audible Ring Command AUD_RING ON OFF CR This command is to enable disable or query the current status of Audible Ring Expected Response Audible Ring Response Exam...

Page 70: ...tituted for the number In this case the call will be placed to the front panel of the RTU 292 Likewise the parameter LP may also be substituted for the number This will cause the call to be routed to the Local Phone option if installed Valid digits for the number string are 0 9 the characters and The comma character is used to produce a 2 second pause while dialing No spaces are allowed in the num...

Page 71: ...o use this command This is done by using the DIAL command or the TEL LINE PH command Valid digits for the number string are 0 9 the characters and The comma character is used to produce a 2 second pause No spaces are allowed in the number string Expected Response DTMF Response Examples DTMF 1234 CR Command requesting the RTU 292 to generate DTMF for the digits 1 2 3 and 4 DTMF 1234 E0 CR Status re...

Page 72: ... of the Handset Phone path HS_PH OFF E0 CR Status returned showing that Handset Phone is disabled 5 3 9 Handset Radio Command HS_RAD ON OFF CR This command is to enable disable or query the current status of Handset Radio Expected Response Handset Radio Response Examples HS_RAD ON CR Command to enable the Handset Radio path HS_RAD ON E0 CR Status returned showing that the Handset Radio path is ena...

Page 73: ...f the Speaker Phone path SPKR_PH OFF E0 CR Status returned showing that Speaker Phone is disabled 5 3 11 Speaker Radio Command SPKR_RAD ON OFF CR This command is to enable disable or query the current status of the Speaker Radio path Expected Response Speaker Radio Response Examples SPKR_RAD ON CR Command to enable the Speaker Radio path SPKR_RAD ON E0 CR Status returned showing that the Speaker R...

Page 74: ...ace of the phone number data the speed dial location will be erased The speed dial location can be reviewed by entering a in place of the phone number The phone number may contain up to 25 digits Expected Response Speed Dial Response Examples SD 1 5551212 CR Command to program location 1 with the phone number 555 1212 SD 1 5551212 E0 CR Status showing that location 1 is programmed with the number ...

Page 75: ...L_LINE_PH OFF E0 CR Status returned showing that Tel Line Phone is disabled 5 3 14 Tel Line Radio Command TEL_LINE_RAD ON OFF CR This command is to enable disable or query the current status of Tel Line Radio Note that enabling Tel Line Radio will put the PSTN in an Off Hook status and cause the DSP telephone hybrid to adapt Disabling Tel Line Radio will only put the PSTN back on hook if Tel Line ...

Page 76: ...MAR 98 11 05 20 E0 CR Status returned indicating that the date is March 1st 98 and the time is 11 05 and 20 seconds in the morning TIME 141830 CR Command to set the time to 2 18 and 30 seconds in the afternoon 05 DEC 97 14 18 30 E0 CR Status returned indicating that the date is December 5th 97 and the time is 2 18 and 30 seconds in the afternoon 5 3 16 Software Version Command VER CR This command ...

Page 77: ... response name string There is at least one space between each data section Most data is presented in a specific order The last data section is always the response error code The error code takes the form Exx where xx is a number The various error conditions are reflected in this number The error response E0 signifies that there were no errors Finally the response string is terminated by a Carriag...

Page 78: ...ephone Connection Made dd MON yy hh mm ss Exx CR Type Asynchronous Response To Start of a Radio Telephone call This response indicates that a Radio Telephone call has been started The response shows the current time and date The time is shown in 24 hour format Note the Call Logging Feature must be enabled before use See 3 7 12 Examples Status indicating that a radio telephone call has been started...

Page 79: ...ct Command Telephone Command Disconnect System Initiated Disconnect This response indicates that the PSTN Operator or Local Phone has been disconnected Examples DISC E0 CR Status returned indicating that the PSTN was disconnected 5 4 6 DTMF Response DTMF number string Exx CR Type Synchronous Response To DTMF Command This response indicates that DTMF was generated for the given number Valid digits ...

Page 80: ...elephone call has finished and the call lasted for 0 hours 10 minutes 25 seconds Connection dropped elapsed time 00 10 25 E0 CR 5 4 8 Handset Phone Response HS_PH ON OFF Exx CR Type Synchronous Response To Handset Phone Command This response indicates the Handset Phone path status Examples HS_PH ON E0 CR Status indicating that the Handset Phone path is enabled HS_PH OFF E0 CR Status returned indic...

Page 81: ...th is enabled SPKR_PH OFF E0 CR Status returned indicating that the Speaker Phone path is disabled 5 4 11 Speaker Radio Response SPKR_RAD ON OFF Exx CR Type Synchronous Response To Speaker Radio Command This response indicates the Speaker Radio path status Examples SPKR_RAD ON E0 CR Status indicating that the Speaker Radio path is enabled SPKR_RAD OFF E0 CR Status returned indicating that the Spea...

Page 82: ...onous Response To Tel Line Phone Command This response indicates the Tel Line Phone path status Examples TEL_LINE_PH ON E0 CR Status indicating that the Tel Line Phone path is enabled TEL_LINE_PH OFF E0 CR Status returned indicating that the Tel Line Phone path is disabled 5 4 14 Tel Line Radio Response TEL_LINE_RAD ON OFF Exx CR Type Synchronous Response To Tel Line Radio Command This response in...

Page 83: ...18 30 CR Status returned indicating that the date is December 5th 97 and the time is 2 18 and 30 seconds in the afternoon The strings representing the month are JAN FEB MAR APR MAY JUN JLY AUG SEP OCT NOV DEC 5 4 16 Version Response VER a bb Exx CR Type Synchronous Response To Version Command This response gives the RTU 292 firmware version data The data is in the format a bb where a is the major ...

Page 84: ...lems with a given command Unless otherwise noted the user may assume that a non zero error code indicates that the command was not acted upon Table 5 4 Response Error Codes E0 No error E1 The previous command is unknown E2 The previous command was missing required parameter s E3 The previous command had a parameter which was out of the allowed range for this command E4 The previous command request...

Page 85: ...y with identical items 3 Carefully observe lead dress and component orientation when repairing circuits Keep components leads as short as possible 4 Reference to the component side of a printed circuit board denotes the side of the board on which the components are mounted The solder or circuit side refers to the side opposite the components 6 4 ALIGNMENT No alignment is required or possible other...

Page 86: ...cification In actual use the hybrid balance of the RTU 292 is excellent into impedances other than 600 Ohm such as the complex impedances of the telephone lines and is far better than any conventional hybrid under these conditions The procedure for this test using a noise generator is listed in paragraph 6 5 2 1 If a noise generator is not available the alternate test method that employs an audio ...

Page 87: ...er reads 6dBm 0 387V rms This sets the transmit signal output path in the RTU 292 for unity gain if the input level is correctly set 5 Adjust the RX Level Adjust R116 so that the PEAK LED flashes rapidly and is on about 50 of the time This is different from the instructions in paragraph 2 10 3 which set the RX Level Adjust for voice 6 Remove the unit from Set up Mode by turning the RTU 292 Main Po...

Page 88: ...e noise level into the RTU 292 s hybrid to approximately 0dBm 6 Remove the unit from Set up Mode by turning the RTU 292 Main Power OFF setting SW2 7 OFF and then turning the main power back ON 7 Set the audio generator frequency to about 1 kHz 8 Push the TEL LINE RADIO button to start the adaptation cycle 9 When the initial adaptation cycle is complete the tone output can be read on the audio volt...

Page 89: ...he positions of the other buttons are unimportant 4 Set the audio signal generator frequency to 1 kHz with an output amplitude of less than 40dBm 7 7mV rms 5 Push the TEL LINE RADIO button to start the adaptation cycle 6 When the initial adaptation cycle is complete slowly increase the audio generator amplitude until the Keyed LED on the RTU 292 comes on The audio generator amplitude at this point...

Page 90: ...io level from the radio receiver Adjust R116 the RX Input potentiometer CCW If LED still flashes too often after R116 is fully CCW lower audio level at receiver See 2 10 for audio adjust procedures The TEL LINE RADIO LED flashes for more than three seconds after the TEL LINE PHONE button is pushed The RTU 292 is having difficulty during initial adaptation cycle Probable noise conversation dial ton...

Page 91: ...0 1uF 10 100V C1 2 4 364010101 Conn Header 125bd 10pin retain J1 1221062201 LED rt angle pc mnt green CR1 CR2 1221062202 LED rt angle pc mnt Yel CR4 1943000003 Sw push mom 30VDC 4A Sw1 2 3 4 5930302700 Handset Switch Assembly Part No Description Reference Designator 320220250 Cap elect 22uF 25VDC C5 327104101 Cap mylar 0 1uF 10 100V C1 2 4 364010101 Conn Header 125bd 10pin retain J1 1221062202 LED...

Page 92: ...n single row J5 364010101 Conn Header 125bd 10pin retain J19 to Options 364016101 Conn Header Male 16 Pin retain J10 J18 J20 364040101 Conn Header 125 40 pin retain J15 364040104 Conn header 20x2 0 250 spc male J13 J14 365003102 Conn 3 pin w notches 156 center J4 365004100 Conn pcb 4 x 1 friction lock J22 365007100 Conn Header 7 pin friction lock J8 365008100 Conn PCB 8 x 1 friction lock J6 J9 J12...

Page 93: ...or carb 1 4w 10K ohm R185 192 197 198 211 1820103000 Resistor carb 1 4w 10K ohm R119 136 141 146 165 166 180 1820103000 Resistor carb 1 4w 10K ohm R7 10 11 12 17 18 21 32 41 42 1820104000 Resistor carb 1 4w 100K ohm R137 139 142 152 157 161 164 1820104000 Resistor carb 1 4w 100K ohm R20 23 25 27 36 72 74 76 77 1820104000 Resistor carb 1 4w 100K ohm R78 80 82 84 85 86 89123 127 1820105000 Resistor ...

Page 94: ...r pwr ox 3W 7 5 ohm R213 214 1829101040 Resistor Pack 9x100K 10 pin SIP RP1 2 3 4 1920280000 Socket IC non ret tin 28p WDIP For U40 1920520000 Socket IC non ret 52 pin PLCC For U46 1941008000 Sw pcb SPSTx8 dip SW1 SW2 1944020001 Sw slide DPDT 6A 125VAC S6 2020016001 Xfmr audio 1 1 min T1 T2 T3 2021334000 Xfmr Pwr 115 230 VAC 34 VAC 700mA T4 2040080200 Xstr bipolar darl MJE 802 NPN Q1 24 2043041240...

Page 95: ...customer service before ordering options Table 7 1 RTU 292 Options Item JPS P N Description Hardware Options Local Phone Option 5930 596000 Allows remote operation of the RTU 292 through the use of a standard telephone set connected directly to the RTU 292 Local Phone port Telephone set and cable not supplied DTMF Telephone Set 5930 599000 Telephone set for use with the Local Phone Option Voice Pr...

Page 96: ... with a 20 wire cable from the option to connector J7 on the Options Interface board which is also installed in the options tray Figure 7 1 shows correct option placement in the options tray After the Voice Prompt option is installed the main CPU must be informed by switching on the Voice Prompts Enable dipswitch SW1 6 on the Main Board Remember that this switch is only read at unit power up No ot...

Page 97: ...RTU 292 Operations Manual Figure 7 1 Voice Prompt Option Installation JPS Communications Inc 7 3 ...

Page 98: ...Board Figure 7 2 shows correct option placement in the options tray The telephone set and interconnect cable to the telephone set are not included with the option After the Local Phone Option is installed the main CPU must be informed by switching on the Local Phone Enable dipswitch SW1 7 on the Main Board Remember that these switches are only read at unit power up SW1 7 must be left off when the ...

Page 99: ...TN line Once the local phone user has selected a function and entered the associated DTMF character he may use any of the keypad commands that are available to a PSTN caller in the command mode see Table 3 1 It is important to note that the local phone audio into the RTU 292 does not run through the unit s DSP circuitry and therefore cannot activate the VOX function Always de activate the VOX func...

Page 100: ...the glue logic necessary to interface the DSP with the various peripheral chips on the board is provided by PEEL Programmable Electrically Erasable Logic U3 U8 is a reset generator that insures an orderly power up sequence for the DSP and associated components It senses the voltage on the 5V line and generates a reset while the voltage is below approximately 4 55V As the voltage rises above the th...

Page 101: ...s or during pauses in speech SW1 switches 5 6 set the hang time duration 7 4 2 2 Noise Reduction Algorithm The noise reduction algorithm operates by passing the audio through an adaptive FIR Finite Impulse Response filter The filter forms instantaneous bandpass filters around the relatively correlated information contained in speech these filters are not created around non correlated white noise c...

Page 102: ...ration the DSP is constantly checking the states of these switches The VMR and Noise Reduction modes can be used individually or simultaneously They are toggled off on via standard DTMF Operational Commands See section 3 7 and Table 3 1 Figure 7 3 VMM 100 Option Installation JPS Communications Inc 7 8 ...

Page 103: ...kHz VMR Performance Probability of detection Pd 95 at 0 dB S N ratio VMR Output Delay 0 300 ms adjustable VMR Hang Time 0 75 2 25 sec adjustable in half second increments Indicators Audio Level Speech Present LED Size 5 75 x 3 0 printed circuit board 5 VDC 200 mA nominal 12 VDC 5 mA nominal Power Requirements 5 VDC 20 mA nominal ENVIRONMENTAL Operating Temperature 20C to 55C Storage Temperature 40...

Page 104: ... Output Follows state of SW1 1 Low indicates default is NR on 9 NR4 Logic Output Follows state of SW1 2 Low indicates default is VMR on 10 Ground Table 7 8 VMM 100 Switch Functions SW1 1 FUNCTIONS SW1 1 2 For future use leave off SW1 3 4 FUNCTIONS SW1 3 SW1 4 Threshold On On 1 lowest Off On 2 Factory Default On Off 3 Off Off 4 highest SW1 5 6 FUNCTIONS SW1 5 SW1 6 Hangtime On On 0 75 seconds Off O...

Page 105: ...r to asking for the telephone number 7 5 3 Radio Caller Provides Calling Directions The radio user can then enter a phone number terminated by the sign or n n for speed dial location nn If the caller forgets to enter the RTU 292 will simply wait 4 seconds to ensure that data entry is complete and then begin to place the call If no DTMF is detected at the RTU 292 the unit will place a call to the t...

Page 106: ...s its Command Mode meaning that the phone user may enter any of the available DTMF commands from Table 3 1 The Inactivity Timer will now begin to run If this time expires due to a lack of speech or other audio activity the RTU 292 will give a series of 3 short beeps as a warning The radio caller or the phone user may initiate activity within 5 seconds of the warning beeps to reset the timer If nei...

Page 107: ...given 7 6 3 RTU 292 Prompts for Confirmation The RTU 292 then requests confirmation with the prompt Please confirm with a single squelch break The caller confirms his desire to call by giving 1 additional short squelch break within 5 seconds If the RTU 292 does not receive confirmation within that time it will give a Timeout tone prompt terminate the attempt to call and go back to its waiting stat...

Page 108: ...nd Date Check both the time and the date by simply entering the remote control command TIME with no parameters The time and date that the RTC is set to will be returned If not correct set as explained below The RTC keeps track of leap years but not daylight savings time 7 7 2 Setting The Time Enter the command TIME hhmmss where hh is the hour 00 23 mm signifies the minutes 00 59 and ss gives the c...

Page 109: ...e ERROR tone and gives the Data Was Not Accepted By The Radio prompt Whenever a valid command is entered the unit will play back the radio s setting after the command is sent to the radio Note that this feature is only available if the Voice Prompt option is installed Consult the URC 200 manual for further information regarding the command descriptions NOTE It is possible to enable this option rem...

Page 110: ...an mode 0 scan stop 1 scan start 4 Reserved for future use 5 000 255 Squelch select 6 0 1 Text mode select 0 plain text 1 cipher text 7 0 1 Modulation select 0 AM 1 FM 8 0 2 Power level select 0 low 1 med 2 high 9 9 Saves the current radio channel preset data Leave Radio Command Mode may be entered at any time With all of the above commands except 3 99 and the user may substitute the DTMF characte...

Page 111: ...r general sale There are two different power supply schematics On the eighth page is the schematic for the power supply configuration used with the RTU 292 or RTU 300 The ninth page is the power supply configuration for the RTU 285 only Figure 8 3 DSP Module The DSP Module that plugs into the Main Board via a pair of in line 20 pin headers has two schematic pages Figure 8 4 Option Interface Board ...

Page 112: ...RTU 292 Operations Manual Blank Page JPS Communications Inc 8 2 ...

Page 113: ... Kit 1 4 Date Command 5 4 Adaptation 9 3 6 DC INPUT POWER SELECTION 2 4 ADAPTATION 3 7 DC INPUT TERMINAL BLOCK 3 4 Adaptive Hybrid 4 23 DC Power Supply 4 24 Adapts To The Phone Line 3 11 Default Settings 2 3 After the Call Begins 7 12 7 13 Dial Command 5 4 ALIGNMENT 6 1 DIAL MODE 2 8 Alternate Hybrid Test Procedure 6 4 Dial Response 5 13 ASSEMBLIES 1 2 DIAL BUSY GENERATORS 4 26 AUDIBLE RING BUTTON...

Page 114: ...SSEMBLIES 1 3 K FSK Modem 4 22 Full Duplex 9 Key 9 FULL HALF DUPLEX RADIO 2 8 KEY PUSHBUTTON 3 3 Keying Circuits 4 21 G KEYPAD 3 2 General Information 1 1 L GENERAL PRECAUTIONS AND NOTES 6 1 Glossary 9 LED 9 LINE VOLTAGE SELECTION 2 4 H List Of Figures 7 List of Tables 8 Half Duplex 9 LMR 9 HANDSET 3 1 LOCAL PHONE LOCAL PHONE RING THROUGH 2 10 HANDSET BUTTONS 3 2 HANDSET CONNECTOR 2 13 Local Phone...

Page 115: ...Attention Signal 7 11 7 13 OPTIONS INTERFACE BOARD 1 3 Ring Detector and Tone Ringer 4 21 Outline Dimensions 2 18 RS 232 CONNECTION 2 15 RS 232 REMOTE CONTROL OVERVIEW 5 1 RTU 292 Options 7 1 P RTU 292 PASSWORD PROTECTION 3 16 RTU 292 Places the Call 7 11 P1 AC POWER CONNECTOR 3 4 RTU 292 SPECIFICATIONS 1 6 P1 RADIO CONNECTOR 3 4 RX 10 P2 RS 232 CONNECTOR 3 4 RX LINE INPUT IMPEDANCE 2 8 PASSWORD P...

Page 116: ...ine Radio Command 5 9 Tel Line Radio Response 5 16 TERMINAL BLOCK 2 14 3 4 TERMINATING A CALL 3 12 TEST EQUIPMENT REQUIRED 6 1 The Caller Dials The RTU 292 3 11 The Caller Enters The Password if enabled 3 11 The RTU 292 Adapts To The Phone Line 3 11 The RTU 292 Enters the COMMAND Mode 3 12 Theory Of Operation 4 19 Time 7 14 Time Command 5 10 TONE PROMPTS 3 9 Tone Ringer 4 21 TRANSMIT LEVEL SET UP ...

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