USER'S MANUAL
Contents
1. KEY Calls in G722 mode come in through line 1 When a call is detected the ISDN STATUS LED for line 1 will flash and a beep is sent to the headphone output Return return signal and the telephone handset to alert all users There is a different warning tone for each line There is also a buzzer which can be turned on off using the configuration microswitches see chapter 7 CONFIGURATION MICROSWITCHES To pick up press the CALL key Once communication has been established the Line 1 ISDN STATUS LED will light and stay lit throughout the call The Line 1 AUDIO SYNC LED lights when the received audio is synchronised You can also configure NOMADA for automatic answer through line 1 by a microswitch see chapter 7 CONFIGURATION MICROSWITCHS 6 5 ENDING CALL IN G722 MODE END KEY Press and hold the END key for at least 1 second to end the call 6 6 SENDING MULTIFREQUENCY TONES THROUGH LINE 1 There is a key that allows the user to send multifrequency tones for remote control functions These tones can only be sent through line 1 G722 so line 1 must be connected and MIC1 HP1 not associated with line 2 G711 The process is as follows 1 Press DTMF key 2 Then press DTMF code to send Sent DTMF tones will be monitored through Return headphone output and telephone handset 6 7 ESTABLISHING A CALL IN G711 MODE LINE 2 Line 2 to the G711 codec is only accesible by the commentator connected to2. pos NOMADA USER MANUAL V2 0 15 Keys to MUTE MIC1 and MIC2 LINE inputs LED lit indicates that the input is active 16 Battery and Power supply indicator BACK PANEL OF THE DEVICE 17 External power supply input 18 Start up switch 19 Connection contacts for batteries 20 Fixing points for the battery holder Prodys NOMADA USER MANUAL V2 0 3 AUDIO INPUTS AND OUTPUTS NOMADA provides two mic inputs MIC1 and MIC2 The second MIC2 is switchable mic line using the associated switch near its input connector Each mic input has a headphone output HP1 and HP2 Each output has a sum signal MICI and MIC2 LINE send and a received audio signal through communications line 1 Return that is the decoded signal in G722 mode This signal will not be available until the decoder is synchronised as indicated by LED AUDIO SYNC line 1 Since input MIC1 and output HP1 can work under G711 there could be two signals in the headphone output that is the MIC 1 signal and the one decoded from line 2 communication in G711 mode So the commentator who works with MIC1 HP1 will be able to participate in G722 PROGRAM and G711 CO ORD being able to switch between them and having control of the communication in each of the lines establish reception and ending call You can also use an analogue external telephone as audio interface via the front panel RJ11 connector This telephone has free a
3. audio input output 1 i e MIC1 HP1 Thus one of the commentators can access the co ord channel 4 The commentator associated to MIC1 HP1 has two options concerning the signal heard at the Return output of PH1 when connected to the co ord line to only hear the return of the co ord line or to hear both the return of the co ord line and the return of the program line G722 see configuration microswitches m NOMADA USER MANUAL V2 0 The process is very simple and allows the commentator access to one or the other line without losing the call in either which will be made independently whether or not line 1 G722 or program is connected To call press the and 2 key followed by the number then the CALL key 2 number to dial CALL A tone is for each key pressed is heard through the headphone output and telephone handset as confirmation When NOMADA detects the sequence 2 the LEDs for line 2 ISDN STATUS and AUDIO SYNC will flash to indicate the unit is ready to make the call 4 If the user waits more than 15 seconds before pressing any key m NOMADA will abort the sequence stop flashing the LEDs and return il the input and output MIC1 HP1 to line 1 Pressing the key returns the person connected to line 1 G722 If line 2 is connected it will stay connected i e both lines connected simultaneously so the keys 2 and allow you to toggle between the two lines i e program
4. 0Hz 15KHz Line input as Mic except e Input impedance 10k e Sensitivity 20 dBu to 20 dBu Headphone outputs e Combo connector e Impedance 50 ohms e Maximum level 12 dBu over 600 ohms COMPRESSION ALGORITHMS e G722 Synchronisation for statistical framing e G711 A Law ISDN e Spo interface e RJ45 Connector e EURO ISDN DIMENSIONS e 210x210x45mm WEIGHT e 3kg
5. CHO noting how the return signal is cancelled when activated LA The canceller only works in line 1 G722 and it does not work in ji MULTIPLEX mode NOMADA USER MANUAL V2 0 IMPORTANT CONSIDERATIONS ABOUT THE ECHO CANCELLER 1 The echo canceller works by comparing the sent signal with the received signal to find the delay The time taken to adjust depends on the round trip delay of the sent signal and on the non adjustment of levels in the audio loop at the remote end 2 The delay range that NOMADA can handle is configurable by microswitchs see chapter 7 CONFIGURATION MICROSWITCHS 3 The local sum option allows whilst echo cancellation is in effect the local commentator s signal to be added summed with the programme return This is configurable by microswitchs see chapter 7 CONFIGURATION MICROSWITCHS 6 11 EXTERNAL TELEPHONE There is an RJ11 connector on the front panel for using a standard analogue telephone This telephone can set up an independent co ord circuit of audio input and output lines MIC1 HP1 and MIC2 HP2 The telephone is associated with line 2 by default i e working in G711 mode Its performance is very simple and allows access to the G711 codec by the commentor connected to MIC1 HP1 Additionally it can make calls through line 1 in G722 mode although this is restricted to avoid interference with the program line USING LINE 2 G711 Making calls through line 2 G711 Connec
6. NOMADA USER MANUAL V2 0 USER S MANUAL Prodys NOMADA USER MANUAL V2 0 INDEX 1 8 9 BLOCK DIAGRAM AND GENERAL FEATURES GENERAL VIEW OF THE DEVICE AUDIO INPUTS AND OUTPUTS COMMUNICATIONS POWER SUPPLY OPERATIONS MANUAL CONFIGURATION MICROSWITCHES MULTIPLEX MODE OPERATION FREQUENTLY ASKED QUESTIONS 10 TECHNICAL SPECIFICATIONS NOMADA USER MANUAL V2 0 1 BLOCK DIAGRAM AND GENERAL FEATURES NOMADA is a truly portable audio codec Compact lightweight easy to use and with all you need for external communications live reports sports transmissions commentators in digital ISDN quality Utilising both B channels of the ISDN basic rate interface BRI NOMADA provides two full duplex circuits of communications one in G722 program and the other in G711 cue talkback mode with the flexibility to adopt different configurations Additionally using powerful on board Digital Signal Processing DSP technology NOMADA is the first audio codec to incorporate an echo canceller which eliminates the problems caused when an N 1 or clean feed configuration is not available To better understand the NOMADA it is necessary to know how it is built by taking a look at the Block Layout NOMADA has three different parts a Audio inputs and outputs b ISDN Terminal adapter So interface c A G722 codec and a G711 codec a Audio inputs and outputs NOMADA provides two transfor
7. akes charge to set the communication requested through the other line The way to proceed to call recall or pick up the call through line 1 G722 in this case is the same as in any other Why doesn t the canceller start the search phase when press the ECHO key with line 1 connected If you have MIC1 HP1 associated to line 2 G711 or the audio in line 1 G722 is not synchronised pressing the ECHO key will have no effect Why doesn t the search phase of the canceller end If your ISDN path is routed through satelite there will be a minimum delay of 250 ms Configure an correct delay see Chapter 7 To do this you must end the communication switch off the device configure the microswitch in this case SW4 switch on and connect again If the remote end doesn t return the sent signal unmodified in level the canceller might lose the delay and never leave this phase Why when controlling line1 G722 by phone can the remote end not hear the commentators but the commentators can hear them When the telephone is controlling line 1 G722 only the audio coming from the telephone is coded not that of the mics but the decoded audio through line 1 G722 reaches the headphones as well as the telephone NOMADA USER MANUAL V2 0 10 TECHNICAL SPECIFICATIONS AUDIO Mic inputs XLR female connector transformer balanced Input impedance 2k Sensitivity 65 dBu to 25 dBu THD lt 0 1 Frequency response 0 5 dB 3
8. and co ord 6 8 RECEIVING A CALL IN LINE 2 G711 When a voice call G711 is received the STATUS ISDN LED associated to line 2 will flash To answer press 2 on the dialling pad and line 2 will be connected The ISDN STATUS LED will stay lit during the whole communication For incoming calls a warning signal at the Return headphone output can be activated depending on the position of the configuration microswitch n 6 6 9 ENDING A CALL IN LINE 1 G711 When line 2 is connected to the input and output MIC1 HP1 pressing the END key for 1 second at least will disconnect the line and the line 2 STATUS LINE LED will switch off If line 1 is connected this input and output will be connected immediately 6 10 ECHO CANCELLER ECHO KEY Communications through ISDN codecs can introduce a significant delay making it difficult for a commentator to concentrate when speaking if monitoring a return signal which includes their own voice NOMADA USER MANUAL V2 0 To solve the problem an N 1 clean feed or mix minus configuration is used that returns the program signal minus the commentator However it is not always possible to do this NOMADA solves the problem by including an echo canceller which uses the on board digital signal processor DSP to estimate the delay automatically and then cancel from the return signal the signal sent by the NOMADA i e the commentator NOMADA calculates the delay and adapt its para
9. are disconnected 2 Press and hold the ECHO key for at least one second when a beep will be heard through the headphone and telephone 3 Enter the last six digits ISDN or last one digit ISDN of the desired number from the MSN sequence 4 Press the ECHO key again to store the number a confirmation beep will be heard Local number is not saved in the non volatile memory so must be entered each time Nomada is switched on Using local number can create confusion if the local number programmed is not correct as the device will not answer any calls If you suspect this cancel local number by pressing ECHO twice whilst both lines are disconnected NOMADA USER MANUAL V2 0 7 CONFIGURATION MICROSWITCHES 1234567 8 EE BE EDS There is a group of microswitches on the side panel by the audio connectors for changing some NOMADA configuration parameters FOR CHANGES TO TAKE EFFECT IT IS NECESSARY TO SWITCH THE NOMADA OFF AND ON AS THESE MICROSWITCHES ARE ONLY READ AT POWER UP SW1 UP Acoustic signal buzzer deactivated DOWN Acoustic signal buzzer activated SW2 UP Manual answer mode on line 1 G722 DOWN Automatic answer mode on line 1 G722 SW3 Selects MULTIPLEX operation mode as explained in chapter 8 This is a special configuration status which changes the operating philosophy of the NOMADA UP MULTIPLEX mode deactivated DOWN MULTIPLEX mode activated SWA Selects the d
10. ccess to line 2 to which it is connected by default sharing communication with the commentator on MIC1 HP1 when he is also using this line However the use of line 1 G722 or PROGRAM has limited access to the telephone to avoid involuntary interference with the PROGRAM signal as we will see later 4 COMMUNICATIONS NOMADA has a built in ISDN terminal adapter handling the two B 64Kbps channels available in a Basic Rate ISDN interface So interface When we refer to line 1 and line 2 we are referring to each of the B channels respectively Line 1 will always be associated with the G722 codec and line 2 the G711 codec Therefore independent of the B channel we are using the data calls i e in G722 mode will be made or received through line 1 and voice calls from digital or analogue lines G711 mode through line 2 Line 1 working in G722 mode i e high voice quality 7kHz is by default associated with the corresponding mic inputs and headphone outputs and referred to as the PROGRAM line Line 2 in G711 mode i e telephone quality 3 1kHz is assigned to the external telephone and identified as the CO ORD line The commentator on MIC1 HP1 can access this line without affecting line 1 G722 PROGRAM being able to switch from one to the other NOMADA USER MANUAL V2 0 5 POWER SUPPLY NOMADA has an external power supply input of 12V or can be powered using the supplied NiMH battery pack NOMADA automatically recognises when
11. elay range of the echo canceller SWA DELAY RANGE UP 0 100 ms DOWN 250 350 ms SW6 Deactivates at the return output of PH1 and PH2 the warning signal of an incoming call through the co ord line UP Warning signal activated DOWN Warning signal deactivated SW7 Activates the sum of the program channel at the output of headphone PH1 when MIC1 is connected to the co ord line UP Sum deactivated DOWN Sum activated NOMADA USER MANUAL V2 0 8 MULTIPLEX MODE OPERATION This mode is enabled through one of the configuration microswitches see chapter 7 CONFIGURATION MICROSWITCHES In this mode the external telephone cannot carry out any action call answer but can confer with the main commentator When one line is connected operation will be normal except for the use of the telephone already mentioned but with two lines connected the effect will be such that all participants on both lines will be able to listen to each other establishing a multiple conference including a commentator using the external analogue telephone but only for sending and receiving audio 9 FREQUENTLY ASKED QUESTIONS Why can t disconnect line 1 G722 with the telephone The telephone can never disconnect line 1 G722 even though you made a call with the telephone through this line and the PH1 LED is lit Use the END key Why can t disconnect line 2 G711 with the telephone If the call was made
12. external power is connected and disconnects the input from the battery pack The unit has a circuit for automatic recharge of batteries when external power supply is connected Batteries need to be charged before use Time 4 hours approx POWER AND BATTERY LED s BATT POWER OFF ON External Power supply FLASHING ON External power supply and battery pack are connected to the unit whilst batteries are recharging LED will stop flashing when this operation is finished ON ON Battery pack connected and not in low Battery status last 30 minutes ON FLASHING Batteries discharged At this point the operation time will last 30 minutes 6 OPERATION 6 1 STARTING UP To switch on put the back panel switch in ON position The startup sequence takes a few seconds during which time keypad LEDs flash When the startup sequence has successfully completed a warning tone is sent to the headphone outputs and the telephone to signify that the equipment is ready to be used 6 2 ESTABLISHING A CALL IN G722 MODE CALL KEY By default NOMADA connects the MIC1 and MIC2 LINE inputs to the encoder G722 and the HP1 and HP2 headphone outputs to the decoder G722 that is both audio inputs and outputs are prepared to establish a communication in G722 mode through one of the available channels in the Basic Rate ISDN Pod NOMADA USER MANUAL V2 0 Press the CALL key dial the number and press the CALL
13. ka A MR E EM f Assa Rt HEADPHONE n j OL Lost 3 l crn HEADPHONE ENCODER rea AM EXTERNAL TELEPHONE NOMADA USER MANUAL V2 0 2 GENERAL VIEW OF THE DEVICE FRONT PANEL 1 MIC1 and MIC2 LINE input level controls 2 HP1 and HP2 headphone output level controls Each headphone output with independent level control for the local signal send and Return signal 3 Connector for external telephone 4 Meter send RIGHT SIDE PANEL 5 MIC1 and MIC2 LINE input connectors 6 MIC LINE selector for MIC2 LINE input 7 HP1 and HP2 headphone connectors 8 Configuration microswitches 9 ISDN connect Pod NOMADA USER MANUAL V2 0 KEYPAD AND LEDS 10 Dialling keypad 11 Function keys CALL Dialling END Call ending RDIAL Dialling last number dialled through line 1 G722 DTMF Sending DTMF tones through line 1 G722 12 LED indicators of line status ISDN STATUS Unlit line disconnected Lit line connected Flashing call in progress or incoming call detected AUDIO SYNC Lit audio synchronised 13 LED indicators of external telephone status PH1 Lit telephone is using line 1 G722 PH2 Lit telephone is in its default state i e using line 2 G711 14 ECHO Key to activate associated LED lit or deactivate LED off the echo canceller LED flashing indicates that the canceller is activated but in the adjusting phase
14. key again The sequence is as follows CALL lt number to dial gt CALL The line1 ISDN STATUS LED will flash until communication is made then stay on throughout the call When the G722 decoder synchronises the line1 AUDIO SYNC LED will light During dialling each key produces a corresponding multifrequency tone monitored by the headphone outputs and telephone so the user has a positive feedback of the number dialled To re dial the last dialed number press the REDIAL key This number remains while the unit is powered but is not stored in the non volatile memory of the unit 6 3 MAKING A CALL IN G722 MODE LINE 1 USING THE PHONEBOOK NOMADA provides a ten number phonebook for easier dialing Simply press the CALL key then and the location of the number to call followed by the CALL key CALL lt i gt CALL LOCATION IN PHONEBOOK PROGRAMMING THE PHONEBOOK 1 Lines must be disconnected 2 Press and the location in the phonebook where you want to store the number 3 Tap in the number 4 Save it by pressing the key again lt i gt lt number to save At each press of the numeric keypad a multifrequency tone is produced in the headphone outputs and the telephone for confirmation NOMADA will indicate that this number has been stored by a corresponding sequence of beeps heard by the headphones and telephone NOMADA USER MANUAL V2 0 6 4 RECEIVING A CALL IN G722 MODE CALL
15. mer balanced mic inputs MIC2 switchable mic line each with independent headphone outputs which allow the commentator to monitor the return and sent signals Inputs and outputs have independent level control b ISDN Terminal Adapter So interface NOMADA has a built in ISDN terminal adapter TA capable of handling the two B channels available in a Basic Rate ISDN interface c G722 and G711 codec NOMADA with its ability to handle communications through both B channels of the ISDN basic rate interface BRI provides two audio encoder decoders to simultaneously receive and send audio through those channels One uses the G722 standard for high voice quality 7KHz normally the program signal The other is a G711 channel whose main application is to set up a command or co ord channel NOMADA This command channel can be set up with any telephone handset either digital ISDN telephone or any other codec handling G711 or using analog telephone network In describing the operation of NOMADA we will cover USER MANUAL V2 0 communication through both 64 Kbps lines or B channels For ease of use NOMADA provides an analogue external telephone connection which can access either line for flexibility in handling the command channel as well as handling the setup of the device mutes P Q2 4 gt hg vac Une 1 TA MUTEI s n ys wer otz ENCODIR n ore DECODER 24
16. meters automatically for cancellation to avoid the distraction of hearing yourself with delay Adjustment of the canceller Once connected with audio syncronized activate the echo canceller by pressing and holding the ECHOC key for at least one second Note If the audio line is not syncronized or MIC1 HP1 are associated to line 2 G711 pressing ECHOC has no effect NOMADA starts its adjustment sequence automatically calculating the delay by sending receiving a proof signal a burst of white noise This signal must be returned from the remote end without changing its level otherwise there will be a delay in the adjustment process or even make it impossible to calculate The associated LED will flash whilst calculating and stay lit on completion whereupon the sent signal will disappear from the return signal Any change in level at the remote end will produce temporary false inputs that will be immediately detected checking every 0 5 seconds if the canceller works perfectly and reactivate the adjustment process sending the proof signal Once established the user can deactivate activate the canceller as required Each time the user activates it the same process starts but if still connected the canceller will retain its original values Once the adjustment has been made the user should check speaking by phone and listening to the return that the canceller correct Activate and deactivate the canceller by pressing E
17. mmunication using the END key USING LINE 1 G722 Making a call through line 1 G722 Line 1 is accessible from the telephone only if the two lines are disconnected The procedure is similar to that of line 2 i e dial the sequence 1 number As each key is pressed a DTMF tone signal is sent to the headphone outputs for confirmation Answering calls received through line 1 The telephone can answer a call received through line 1 G722 as long as line 2 G711 is disconnected To connect just press 1 on the telephone keypad Once connected you can disconnect the phone by pressing the key of the telephone This will not disconnect the call but transfer audio to the inputs and NOMADA USER MANUAL V2 0 outputs of the commentators and revert the phone to its default state associated to the audio of line 2 G711 The PH2 LED will light and the PH1 LED go off Once control of line 1 G722 has been relinquished by the telephone it cannot be regained Ending a call on line 1 from the telephone The telephone cannot end a communication through line 1 which can only be aborted by pressing and holding the END key 6 12 LOCAL NUMBER Local number allows you to assign a specific number to Nomada if the ISDN line supports multiple numbering MSN This way we can guarantee that only calls made to this number will connect To program the local number carry out the following sequence 1 Make sure that the lines
18. t a telephone handset to the front panel and enter the following key sequence on its keypad 2 numbers As each key is pressed a DTMF tone signal is sent to the headphone outputs for confirmation The line 2 ISDN STATUS LED will flash until the call is connected at which point it will stay lit throughout the call To abort the call hang up the phone NOMADA USER MANUAL V2 0 The telephone user can confer with the commentator connected to MIC1 HP1 by pressing the key on the dialling pad when line 1 is connected This will give an advising tone at the return headphone output 5 If line 2 is used by the commentator connected to MIC1 HP1 as the telephone is by default connected to line 2 can intervene in the 3 conversation In this case the communication can only be ended with the END key Answering calls received through line 2 If there is a G711 voice call the line 2 ISDN STATUS LED will flash To answer pick up the phone and press 2 on the dial pad Once connected the ISDN STATUS LED will stay lit throughout Ending line 2 communication from the telephone If the call was made through the telephone just hang up since it is by default connected to line 2 G711 and it can intervene in the communications through that line established by the commentator connected to MIC1 HP1 The ISDN STATUS LED associated line 2 will go off LA If the commentator connected to MIC1 HP1 is utilising line 2 end 3 co
19. using the Nomada keypad the telephone will not be able to hang up line 2 It will only be able to do so where the communication has first been made from the telephone through line 2 G711 by hanging up 2 or making a call through that line 2 number to dial If MIC1 HP1 are connected to line 2 G711 the telephone cannot hang up that line Use the END key Why can t I pick up the phone or make a call through line 2 G711 using the telephone If the PH1 LED is on that is you are communicating through line 1 G722 using the telephone it is not possible to carry out any action on line 2 G711 no call no hang up Why isn t it possible to answer or make a call through line 1 G722 using the telephone You can only make a call or pick up through line 1 G722 using the telephone when line 2 G711 is disconnected NOMADA USER MANUAL V2 0 Why can t I answer or make a call through line 2 G711 with the front keypad If the PH1 LED is on that is you are communicating through line 1 G722 using the telephone you won t be able to carry out any action on line 2 G711 using the front keypad no call no hang up to do so release line 1 G722 of the telephone by pressing its key Is it possible to call recall or pick up the call through line 1 G722 when MIC1 HP1 is associated to line 2 G711 and this line is connected Yes In fact you can maintain the communication through line 2 G711 while the device t
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