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2070-9x User’s Manual

17

Waveforms

Signal Characteristic

Waveform

Mark Frequency

1200Hz

Space Frequency

2200Hz

Soft Carrier
Frequency

900Hz

Alternating Bit
Pattern

1720Hz

OSC out

OSC out

OSC out

Audio Out

PRELIMINARY

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Summary of Contents for 2070-9A

Page 1: ...2070 9D 2070 9A 2070 9B 2070 9E USER S MANUAL 33 6K SMART MODEM June 11 2009 PRELIMINARY ...

Page 2: ...this data to any unauthorized person without the prior written consent of GDI Communications LLC Recipient further agrees not to incorporate these drawings specifications or technical information in whole or in part in any other product or endeavor THIS LEGEND SHALL BE INCLUDED ON ANY REPRODUCTION OF THIS DOCUMENT GDI COMMUNICATIONS LLC 280 I 80 West Exit 1 PO BOX 1330 Verdi Nevada 89439 Phone 775...

Page 3: ...ge connector 6 INSTALLATION 7 Dialup Configuration Switches 7 DISTANCE OR MAXIMUM UNITS PER LINE 9 SYSTEMS WITH NO RTS SIGNAL 9 SYSTEM PROBLEMS ERROR BOOKMARK NOT DEFINED THEORY OF OPERATION 12 DIALUP MODEM 12 FSK OPTION 13 BLOCK DIAGRAMS 14 Dialup Block Diagram 14 FSK Expansion Block Diagram 15 MAINTENANCE 16 PREVENTATIVE MAINTENANCE 16 TROUBLE ANALYSIS 16 TROUBLE SHOOTING SEQUENCE CHART 16 WAVEF...

Page 4: ...ransmitted in only one direction at a time FSK Frequency Shift Keying Communication protocol where data is encoded into binary format and represented by different frequencies Host Any DTE device MARK Signal state of a FSK system that represents a logical 1 value Private wire Telco communication hardware that is leased for private use SPACE Signal state of a FSK system that represents a logical 0 v...

Page 5: ...ating parameters such as speed etc can be configured using industry standard AT commands The serial port has a maximum speed of 115 2 Kbps and is RS 232 and V 24 compatible The 2070 9xx cannot be used with leased lines The SM336 also features Auto Answer Auto Dial and tone or pulse dialing The 2070 9xx can be factory fitted with a FSK Expansion Card which is a FSK Private wire Modem FSK stands for...

Page 6: ...ps 2 4Kbps 1 2K baud 300 baud The modem will automatically select the best operating speed Speeds are 0 01 Specifications V 34 V 32 bis V 32 V 22 bis V 22A B V 23 V 21 Bell 212 Bell 103 V 33 V 17 V 29 V 27 V 21 Channel 2 Error Correction V 42 LAPM MNP2 4 MNP 10 Data Compression V 42 bis MNP 5 Loop Tests ITU V 54 loop2 RDL and Loop 3 LAL Data Carrier 1800 0 5 Hz Calling Tone 1300 10 Hz Answering To...

Page 7: ...allic wire 600 Ohm Modulation Phase Coherent FSK Modulation Frequencies Mark and Space Frequencies have a 1 tolerance Frequency 2070 9A 2070 9B 2070 9E Mark 1200Hz 11200 Hz 19200 Hz Space 2200 Hz 17600 Hz 38400 Hz Soft Carrier 900 Hz 7800 Hz 13800 Hz 4 wire Full Duplex and 2 wire Half Duplex Receive Sensitivity 0 to 40 dB Output Level Continuously adjustable from 8dBm to 0 dBm set to 0dBm Anti str...

Page 8: ...ration Port DB9 DB9 Termination Table Pin Signal 7 RTS 4 DTR 8 CTS 6 DSR 3 TXD 1 DCD 9 RI 2 RXD FSK Receive Data RXD Data Carrier Detect DCD Transmit Data TXD FSK on board Indicators Request to Send RTS Clear to Send CTS FSK Enable Disable switch FSK Full Duplex Half Duplex switch FSK EIA 232C Connector C20 C20 Termination Table C20 Pin Function Pin Function A Audio In J RTS B Audio In K Data In T...

Page 9: ... RTS 6 SP1 RTS 7 SP1 CTS 8 SP1 CTS 9 SP1 DCD 10 SP1 DCD 11 SP2 TXD 12 SP2 TXD 13 SP2 RXD 14 SP2 RXD 15 SP2 RTS 16 SP2 RTS 17 SP2 CTS 18 SP2 CTS 19 SP2 DCD 20 SP2 DCD 21 DC Gnd C50 EN 22 23 DC Gnd 24 25 26 27 DC Gnd 1 DC Gnd DC Gnd 28 12 Serial 29 5VSerial 5VSerial 30 DC Gnd 1 DC Gnd DC Gnd 31 32 PRELIMINARY ...

Page 10: ...modem are located on the top of the main board closer to the front panel Refer to the following table when configuring the modem Dialup Configuration Switches Switch Closed Open 1 DB9 SP2 Dial Up 2 DM9 mode DCE DTE 3 RTS mode High Normal 4 RS 485 Normal Inverted 5 Future Expansion Switch 1 Default Open Open When switch 1 is open the dialup modem can be configured via the front panel DB9 connector ...

Page 11: ...e 2 wire mode the transmitter output is connected to the Receiver input For further adaptation all of the timing signals can be configured to be half their normal time Switch position 3 reduces the CTS delay to 6ms Position 4 reduces the Soft Carrier time to 5ms Position 6 reduces the Receiver Squelch time to 3 2ms This is the time in a 2 wire half duplex system that the Receiver is held OFF after...

Page 12: ...etermined by 1 The length of the line 2 The quality of the line 3 The number of units on the line 4 The transmitted signal level We can do anything about the length and quality of the line but we can adjust the transmitted signal level and the input impedance of the 496 Modem The output level of the 496 is set at the factory to 0 dBm A 0 dBm signal is normally good enough to give you a range of 5 ...

Page 13: ...n the edge connector is pulled up with a 1 0K resistor to 12V so make that nothing is connected to the RTS pin L If you are in a situation where you don t have control of RTS but you have more than one modem on the line you will have to use a Key On Data device to control the Modem GDI can supply these devices Please contact the factory for more information A common problem in 4 wire systems is no...

Page 14: ...e that adjustment The Audio output must be loaded with 600 Ohms and the output level measured across the 600 Ohm resistor You have an adjustment range from 8 to 0 dBm The two other potentiometers on the board should not need adjustment for the life of the modem and require special equipment to set correctly Contact the factory if you feel these need adjustment PRELIMINARY ...

Page 15: ...ly descrete components switches and jumpers It also provides a means for making rapid changes to the functionality without increasing the cost to the user There are four switches connected to the PLD which configures all modes for the board This includes RTS CTS handshaking modes RS 485 inversion and DB9 configuration The PLD then routes the signals to the correct outputs The signals from SP1 are ...

Page 16: ...be 8ms of the Mark frequency present on the input for Carrier Detect to activate When the Carrier Detect signal goes active the Receiver will be enabled That Mark signal will also have to be above a certain threshold before the Mark detect circuit will be activated The CTS delay circuitry will cause the Mark frequency to be present on the receivers input for 12ms When RTS Request to Send is assert...

Page 17: ...2070 9x User s Manual 14 Block diagrams Dialup Block Diagram PRELIMINARY ...

Page 18: ...2070 9x User s Manual 15 FSK Expansion Block Diagram PRELIMINARY ...

Page 19: ...art on the next page will help find the problem if you decide to fix the model 400 yourself Trouble shooting Sequence chart PROBLEM CAUSE The board is non functioning Power coming into the board or could have a problem Check connectors Modem is not generating Mark and Space Freq No RTS or TXD coming from Host Check edge connector Q8 Q7 and U8 Transmitter turns Off after 6 seconds Anti streaming is...

Page 20: ... User s Manual 17 Waveforms Signal Characteristic Waveform Mark Frequency 1200Hz Space Frequency 2200Hz Soft Carrier Frequency 900Hz Alternating Bit Pattern 1720Hz OSC out OSC out OSC out Audio Out PRELIMINARY ...

Page 21: ...2070 9x User s Manual 18 Symmetry 50 CTS Delay 12ms DCD 8ms Soft Carrier time 10ms RXD RTS CTS RTS DCD Audio In Audio Out Soft Carrier Enable RTS PRELIMINARY ...

Page 22: ...5ms RTS Recvr Squelch Enable Voltage Measurements For DC Isolated Models TP Measurement tolerance TP13 5vdc 2vdc TP11 5vdc 2vdc TP10 5vdc 2vdc For non Isolated Models TP Measurement tolerance TP13 12vdc 6vdc TP11 12vdc 6vdc TP10 5vdc 2vdc PRELIMINARY ...

Page 23: ... User s Manual 20 GDICOMMUNICATIONS L L C TRAFFIC EQUIPMENT MANUFACTURER SPECIALIZING IN COMMUNICATIONS 280 I 80 WEST EXIT 1 P O BOX 1330 VERDI NEVADA 89439 TELEPHONE 775 345 8000 FAX 775 345 8010 PRELIMINARY ...

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