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Chapter 1

Introduction

ongratulations for purchasing the finest industrial-grade fast-
poll modem available.

The DSP9612 (Flash Poll) modem is a 9600/4800/0-

1800 bps modem designed for 4-wire, full-duplex or 2-wire, half-
duplex operation over a voice-band leased line. The modem is designed
utilizing the latest digital-signal processing (DSP) technology to
achieve high performance. The modem employs proprietary
modulation and encoding scheme to achieve fast modem training time.
The modem is also backward compatible with Bell 202 modems.

The DSP9612 modem is ideally suited for multi-point communication
systems that require fast response time, short training time, and low
throughput delay. The DSP9612 is the most technologically advanced
modem on the market.

This User’s Guide is designed to let you get your modem “up and
running” as quickly as possible. It contains all the information you
need to configure and install your modem. It also contains
troubleshooting information in the unlikely event you encounter a
problem with your modem.

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Summary of Contents for DSP 9612

Page 1: ...DSP 9612 Flash Poll Modem User s Guide 0049 0117 000 Rev B ...

Page 2: ...de 13 Low Speed FSK Mode 18 CONNECTING TO A TRANSMISSION LINE 23 CONNECTING TO A VOLTAGE SOURCE 25 CONNECTING AN RS 232 DEVICE 26 LEDS 26 LOOPBACK CONTROL SWITCH 27 APPENDIX A TROUBLESHOOTING 29 PROBLEM SOLVING 29 APPENDIX B SPECIFICATIONS 31 GENERAL SPECIFICATIONS 31 MECHANICAL SPECIFICATIONS 32 INTERFACE CONNECTOR PIN ASSIGNMENTS 33 RS 232 RTU Interface 34 ENVIRONMENTAL SPECIFICATIONS 34 COMPLIA...

Page 3: ...Contents Page iv NOTES ...

Page 4: ...tion and encoding scheme to achieve fast modem training time The modem is also backward compatible with Bell 202 modems The DSP9612 modem is ideally suited for multi point communication systems that require fast response time short training time and low throughput delay The DSP9612 is the most technologically advanced modem on the market This User s Guide is designed to let you get your modem up a...

Page 5: ...ions c Works within an extended temperature range of 40ºC to 85ºC c Designed with coupling transformers for high voltage isolation and common mode noise rejection in industrial and commercial environments c Operate over voice band conditioned or unconditioned leased line and pilot wires c Accepts power from a wide range of AC and DC power supplies c Standard industrial connectors for data analog a...

Page 6: ...ation Figure 1 1 Network of Multipoint Configuration There are a number of factors that can affect the network s and modem s operation and performance These include c Operating speed c 2 wire or 4 wire configuration c Transmission line characteristics noise and line impairments c Network configuration point to point or multipoint c Number of nodes on the network ...

Page 7: ...Introduction Page 8 NOTES ...

Page 8: ...e c This User s Guide If your package contents are damaged or missing please contact your place of purchase immediately Additional Items You Need To use your modem you need the following additional items c Two or four wire transmission line or leased line c A power supply that provides either 85 to 265 Volts AC 50 to 60 Hz single phase AC version or 10 to 53 Volts DC DC version T ...

Page 9: ...eft side this view shows c A 4 wire 2 wire configuration block See page 23 c A female 25 pin RS 232 connector for connecting a standard DTE RTU See page 26 c A POWER ON OFF switch c A power connector See page 25 Figure 2 1 Back View of Modem B B a a c c k k V Vi e e w w Power Source Power Switch DTE Connection Leased Line ...

Page 10: ...rview Page 11 Front View Figure 2 2 shows the front view of the modem Starting from the left side this view shows c A set of nine LEDs See page 26 c A loopback test switch See page 27 Figure 2 2 Front View of Modem ...

Page 11: ...mmunications interface s and front panel power interface It should also let you view the red LED on the front panel Configuring the Modem You configure the modem using the two sets of DIP switches on the bottom of the modem front panel The switches can have one of two functions depending on how switch SW2 1 is set c Setting switch SW2 1 to OFF configures the modem for high speed Fast Poll mode In ...

Page 12: ...age 15 10 to 43 dBm 3 to 30 dBm SW 1 6 TX Cable Equalizer page 15 Enabled Disabled SW 1 7 RX Cable Equalizer page 15 Enabled Disabled SW 1 8 Anti streaming page 15 Active Inactive SW 2 1 High Speed Low Speed Mode page 16 Low Speed Mode FSK High Speed Mode Fast Poll SW 2 2 Data Rate in Fast Poll Mode 4800 bps 9600 bps SW 2 3 Async Character 11 bits 10 bits SW 2 4 Auto RTS page 16 Enabled Disabled S...

Page 13: ...Levels High Speed and Low Speed Modes SW1 through SW4 Switch Settings Transmit Level SW1 1 SW1 2 SW1 3 SW1 4 0 dBm OFF OFF OFF OFF 1 dBm OFF OFF OFF ON 2 dBm OFF OFF ON OFF 3 dBm OFF OFF ON ON 4 dBm OFF ON OFF OFF 5 dBm OFF ON OFF ON 6 dBm OFF ON ON OFF 7 dBm OFF ON ON ON 8 dBm ON OFF OFF OFF 9 dBm ON OFF OFF ON 10 dBm ON OFF ON OFF 11 dBm ON OFF ON ON 12 dBm ON ON OFF OFF 13 dBm ON ON OFF ON 14 d...

Page 14: ...ompromise Cable Equalizer when polling on long metallic circuits The cable equalizer is active only when the modem is in high speed mode SW2 1 set to OFF SW1 8 Anti streaming high low speed modes SW1 8 ON Anti streaming active OFF Anti stream inactive Typically anti streaming is used in multi point applications to prevent a malfunctioning slave modem from occupying the line indefinitely When anti ...

Page 15: ...igh speed mode only SW2 4 ON Enable Auto RTS OFF Disable Auto RTS For data terminals that do not support hardware RTS set SW2 4 to ON to enable buffer mode In this mode TXD is detected at the modem and internal RTS is turned ON After training completes the TXD is transmitted to the remote modem The transmitter turns off if no TXD is detected after 1 character length of idle time SW2 6 Production T...

Page 16: ...dem forces the transmit carrier active and the RTS CTS delay is minimum 0 5 ms You can use constant carrier in 4 wire point to point or multi point applications from master to slave modems In switched carrier mode SW2 8 set to OFF the RTS CTS delay is 23 ms SW 2 9 RX Termination high low speed modes SW2 9 ON Disable Rx Termination OFF Enable Rx termination SW2 9 selects whether RX termination is e...

Page 17: ...ceiver Dynamic Range page 20 10 to 43 dBm 3 to 30 dBm SW 1 6 SW1 7 RTS CTS Delay page 20 see Table 2 5 page 20 SW 1 8 Anti streaming page 20 Active Inactive SW 2 1 High Speed Low Speed Mode page 21 Low Speed FSK Mode High Speed Fast Poll Mode SW 2 2 CD Delay page 21 23 ms 6 ms SW 2 3 Turnaround SQ page 21 0 ms 8 ms SW 2 4 Not Used SW2 5 Soft Carrier page 22 Disabled Enabled SW 2 6 Production Test ...

Page 18: ...t Levels High Speed and Low Speed Modes SW1 1 through SW1 4 Switch Settings Transmit Level SW1 1 SW1 2 SW1 3 SW1 4 0 dBm OFF OFF OFF OFF 1 dBm OFF OFF OFF ON 2 dBm OFF OFF ON OFF 3 dBm OFF OFF ON ON 4 dBm OFF ON OFF OFF 5 dBm OFF ON OFF ON 6 dBm OFF ON ON OFF 7 dBm OFF ON ON ON 8 dBm ON OFF OFF OFF 9 dBm ON OFF OFF ON 10 dBm ON OFF ON OFF 11 dBm ON OFF ON ON 12 dBm ON ON OFF OFF 13 dBm ON ON OFF O...

Page 19: ...7 Switch Settings RTS CTS Delay SW1 6 SW1 7 8 ms delay OFF OFF 33 ms Delay OFF ON 59 ms Delay ON OFF 219 ms delay ON ON SW1 8 Anti streaming high low speed modes SW1 8 ON Anti streaming active OFF Anti stream inactive Typically anti streaming is used in multi point applications to prevent a malfunctioning slave modem from occupying the line indefinitely When anti streaming is active the modem can ...

Page 20: ...elay and is valid for low speed mode only Setting this switch to ON configures the modem to turn on CD 23 milliseconds after it detects a valid carrier signal Setting this switch to OFF configures the modem to turn on CD 6 milliseconds after it detects a valid carrier signal SW2 3 Turnaround Squelch Delay low speed mode only SW2 3 ON 0 milliseconds OFF 8 milliseconds SW2 3 controls the turnaround ...

Page 21: ...l operation SW2 7 2 4 Wire Operation high low speed modes SW2 7 ON 2 Wire Half Duplex Mode OFF 4 Wire Full Duplex Mode SW2 7 configures the modem for 4 wire full duplex or 2 wire half duplex operation SW2 8 Carrier Control high low speed modes SW2 8 ON Constant OFF Switched SW2 8 selects either constant or switched carrier Constant carrier allows DTEs such as asynchronous dumb terminals or RTUs to...

Page 22: ...ot terminated Connecting to a Transmission Line The modem has a transmission line interface that can be configured for 2 or 4 wire analog connection where one pair is used to transmit data Tx and Tx and one pair is used to receive data Rx and Rx Table 2 6 shows the pin numbers and corresponding signals for the modem Figure 2 3 shows the transmission line interface Note For communication to occur t...

Page 23: ...Installation Page 24 Table 2 6 Transmission Line Connector Pin Assignments This Pin Number Corresponds to This Signal 1 Rx 2 Rx 3 Tx 4 Tx Figure 2 3 Transmission Line Interface ...

Page 24: ...pply voltage guidelines Otherwise you will void your warranty if the wrong voltage is applied c Be sure the voltage source is within the permitted ranges shown above Otherwise your modem and any attached devices may be damaged c Customer supplied cables must be suitable for the site environmental conditions c Screw terminals on the power interface accept 24 to 16 AWG However surge protection is gu...

Page 25: ...ments shown under RS 232 RTU Interface on page 34 LEDs The front panel of the modem provides the LEDs shown in Table 2 7 Table 2 7 Modem LEDs LED Color Description PWR Green Power Input RTS Yellow Request To Send CTS Yellow Clear To Send TxD Yellow Transmit Data RxD Yellow Receive Data DCD Yellow Carrier Detect DSR Yellow Data Set Ready Modem Ready ALB Red Analog Loopback DLB Red Digital Loopback ...

Page 26: ...l loopback started by pressing the button two times c Remote digital loopback set the local modem s RTS signal to low Then press the remote modem s diagnostics button three times and raise the local modem s RTS signal to start the test The ALB and DLB LEDs go ON when the modem is in remote digital loopback This test is only available in Fast Poll mode only Figure 2 4 illustrates these three diagno...

Page 27: ...Installation Page 28 NOTES ...

Page 28: ... A 1 offers troubleshooting solutions for modem problems Table A 1 Troubleshooting Suggestions If Perform These Procedures Modem does not respond to the attached DTE and the all LEDs are off Check the power supply input for your specific model see page 25 Modem does not receive data and the DCD and RxD LEDs are off The receive line pair may be disconnected from the modem Make sure the transmission...

Page 29: ...Procedures problem The RTS CTS and TxD LEDs do not blink The attached terminal or DTE may not be sending data to the modem Verify that data is being transmitted If data is being transmitted make sure the RS 232 cable is sound and securely connected to the modem and terminal or DTE ...

Page 30: ... 4 or 2 wire leased line conditioned or unconditioned Private metallic circuits up to 9 5 miles 24 AWG without cable equalizer Up to 15 0 miles 24 AWG with TX and RX cable equalizer Operating modes 2 wire half duplex or 4 wire full duplex Modulation High speed fast poll proprietary FSK Bell 202T compatible Mark 1200 Hz Space 2200 Hz Soft Carrier 900 Hz Equalizer Automatic adaptive RTS CTS Delay 23...

Page 31: ...DIP switch selectable Carrier loss recovery Train on Data Throughput delay Less than 10 milliseconds for fast polling Auto RTS Support DTE without hardware RTS high speed only Anti Streaming 27 second timer to prevent transmitter lock up network Mechanical Specifications Enclosure Aluminum with removable front and rear panels Dimensions 5 70 wide x 8 30 long x 1 50 high Weight 1 9 lbs Interface co...

Page 32: ...ts Page 33 Interface Connector Pin Assignments Leased Line Terminal Block Pin Assignments This Pin Number Corresponds to This Signal 1 Rx 2 Rx 3 Tx 4 Tx Back to Back Connection to a Second Modem Rx Rx Rx Rx Tx Tx Tx Tx Modem 1 Modem 2 ...

Page 33: ... 4 Request To Send CTS Output 5 Clear To Send DSR Output 6 Data Set Ready Modem Ready SG 7 Signal Ground DCD Output 8 Data Carrier Detected DTR Input 20 Data Terminal Ready Host Ready Environmental Specifications Operating temperature 40 to 85o C Storage temperature 40 to 125o C Operating humidity 5 to 95 non condensing Isolation 3750 V RMS Surge protection Leased line up to 15K VA ...

Page 34: ...Compliances Page 35 Compliances The modem is designed to meet the following agency requirements EMI RFI FCC part 15 for Class A computing device Industry Canada Emissions ...

Page 35: ...Specifications Page 36 NOTES ...

Page 36: ...eception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures c Reorient or relocate the receiving antenna c Increase the separation between the equipment and the receiver c Connect the equipment to an outlet on a circuit other than the one to which the receiver is connected c Consult the deal...

Page 37: ...Compliances Page 38 NOTES ...

Page 38: ...ion neglect unauthorized repair or installation are not covered by the warranty shall make the final determination as to the existence and cause of any alleged defect No liability is assumed for expendable items such as lamps and fuses No warranty is made with respect to custom products or Products produced to Customer s specifications except as specifically stated in writing by in the agreement f...

Page 39: ...Limited Product Warranty Page 40 NOTES ...

Page 40: ...model number usually found on the serial number tag the serial number for each item you wish to return a description of the problem you are encountering and the cause of the problem if known A product support specialist may call to verify that the product is properly installed or may ask you to perform tests to insure that the product has actually failed After review of the problem an RMA number w...

Page 41: ...RMA Procedure Page 42 ...

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