336RE
Contents
1. Bit Mapped Register Bit Mapped Register Flash Dial Modifier Time Ol Sec Inactivity Timer Minute Bit Mapped Options Status XON Character ASCII XOFF Character ASCII Negotiation Fallback Desired Line Speed Delay Before Forced Hang up Second Flow Control Options Status General Bit Mapped Options Status General Bit Mapped Options Status Data Compression Selection 13601138 Negotiation Selection 7 0 70r128 Break Signaling Control for compatibility only PSTN Transmit Attenuation Level 10 0 15 dBm Fax Transmit Attenuation Level 10 dBm Negotiation Messages Options 0 Leased Line Transmit Attenuation Cellular Transmit Level COMPATIBILITY SPEED THROUGHPUT COMMAND PROTOCOL DIP SWITCH LED HANDSHAKE DIAGNOSTIC FLOW CONTROL NVRAM FUNCTION APPENDIX A SPECIFICATION ITU T V 34bis V 34 V FC V 32bis V 32 V 22bis V 23 V 22 V 21 and BELL 212A 103 Compatible 300 1200 2400 4800 7200 9600 12000 14400 16800 19200 21600 24000 26400 28800 31200 33600bps Max 115200 bps Asynchronous Hayes AT Command or ITU T V 25bis Command Compatible ITU T V 42 and MNP 1 4 Error Correction ITU T V 42bis and MNP 5 Data Compression ITU T V 8 Multi mode Handshake ITU T V 54 Diagnostic MNP 10 Cellular Protocol 12 position and 2 positi2. CIC Dialing Command This command dials a telephone number specified by the parameter n The n in this command is a dial string which includes telephone number 0 to 9 and for tone dialing only dial modifiers please refer to ATDs command Any dial modifier specified in ATD command is valid here in ITU T V 25bis command mode There are four extra dial modifiers that V 25bis defined listed below Same definition as W modifier in the ATD command lt Same definition as modifier in the ATD command amp Same definition as modifier in the ATD command Same definition as modifier in the ATD command Dialing Stored Number Command Dials the telephone number that previously stored in memory location n Where n 0 9 Stored Telephone Number in Location m This command stores telephone number in memory location m for later dialing It is identical with the AT amp Z command in AT command mode Where m 0 9 The n is a dial string of up to 35 characters Valid dial string characters are O to 9 dial modifiers and for tone dialing Display the Stored Telephone Number This command shows the ten location O to 9 stored telephone numbers Disregard Incoming Call The DIC command disables the auto answer function of the modem in ITU T V 25bis operation mode Connect Incoming Call 15 CNL This command enables the auto answer function of the modem Execute AT Command This command allows t
3. ON OFF ON ON 4800bps OFF OFF ON ON 7200bps ON ON OFF ON 9600bps OFF ON OFF ON 12000bps ON OFF OFF ON 14400bps OFF OFF OFF ON 16800bps ON ON ON OFF 19200bps OFF ON ON OFF 21600bps ON OFF ON OFF 24000bps OFF OFF ON OFF 26400bps ON ON OFF OFF 28800bps OFF ON OFF OFF 38400bps ON OFF OFF OFF 57600bps OFF OFF OFF OFF 115200bps POSITION 8 9 10 11 The Line Speed DCE Speed selection 8 9 10 11 Line Speed DCE Speed ON ON ON ON 300bps V 21 OFF ON ON ON 1200 75bps V 23 ON OFF ON ON 1200bps V 22 Bell 103 OFF OFF ON ON 2400bps V 22 bis ON ON OFF ON 4800bps V 32 V 32 bis OFF ON OFF ON 7200bps V 32 bis ON OFF OFF ON 9600bps V 32 V 32 bis OFF OFF OFF ON 12000bps V 32 bis ON ON ON OFF 14400bps V 32 bis OFF ON ON OFF 16800bps V 34 ON OFF ON OFF 19200bps V 34 OFF OFF ON OFF 21600bps V 34 ON ON OFF OFF 24000bps V 34 OFF ON OFF OFF 26400bps V 34 ON OFF OFF OFF 28800bps V 34 OFF OFF OFF OFF Line speed follow DTE speed POSITION 12 fi DIP switch NVRAM selection ON Loads DIP switch for power on configuration OFF Loads NVRAM for power on configuration SW2 The 2 position DIP Switch Position State Description 1 ON Answer mode OFF Originate mode 2 ON Leased Line Operation OFF Dial up Operation CHAPTER 2 AT COMMAND GUIDELINES AT Command Set ATA A ATBn ATBO A
4. Data Terminal Equipment transmits data into the serial port of the modem 2 OH Off Hook Lights up when off hook EC Error Correction When configure to error correction mode in command mode When making a protocol link V 42 or MNP4 with remote modem in data mode Modem Rear Panel dp 5 8 POWER AC SERIAL PORT SWI SW2 LINE Figure 1 2 Modem Rear Panel POWER Power switch AC The power source input Put the other end into the wall outlet of the AC power source SERIAL PORT The RS 232 serial port Use the RS 232C cable to connect the modem and the computer or terminal LINE The jack allows user to connect the telephone line to the modem Dip Switch 123 4 5 6 7 8 9 10 11 12 1 2 SWI SW2 SWI The 12 position DIP Switch POSITION 1 2 Operation and line type selection 1 2 ON ON Power on operation OFF ON V 25bis operation ON OFF dumb mode operation OFF OFF AT command operation POSITION 3 Asynchronous Synchronous Operation selection ON Synchronous operation OFF Asynchronous operation POSITION 4 5 6 7 The DTE Speed selection 4 5 6 7 IDTE Speed ON ON ON ON 11200bps OFF ON ON ON 2400bps
5. AT amp O1 AT amp Q2 AT amp Q3 AT amp Q5 AT amp Q6 AT amp Rn AT amp RO AT amp RI AT amp Sn AT amp SO AT amp SI AT amp S2 AT amp Tn AT amp TO AT amp T1 AT amp T3 AT amp T4 AT amp T5 AT amp T6 AT amp T7 AT amp T8 AT amp Un AT amp UO AT amp UI AT amp V AT amp Wn AT amp Xn AT amp XO 39 61 Make Break ratio at 10 pulses second Default 33 67 Make Break ratio at 10 pulses second 39 61 Make Break ratio at 20 pulses second 33 67 Make Break ratio at 20 pulses second Select Communication Mode Communicates in direct asynchronous mode Refers to the command AT amp M1 Refers to the command AT amp M2 Refers to the command AT amp M3 Communicates in error correction mode Default Communicates in asynchronous data operation with normal speed buffered mode Serial Port RTS CTS Option Command CTS follows RTS at all time Default Assumes CTS always on Serial Port DSR Control Command DSR remains ON at all time Default DSR follows the ITU T recommendation DSR follows carrier Loop Test Functions Ends loop test Local analog loop back Local digital loop back Responds to remote digital loop back request Default Ignores remote digital loop back request Initiates ITU T remote digital loop back Remote digital loop back with self test Local analog loop back with self test Trellis Coding Modulation Selection Command Enables trellis coding modulation Default Disables trellis coding modulation
6. Atrie 33 6K MODEM User s Manual Atrie ATRIE 336RE MODEM USER S MANUAL ATRIE TECHNOLOGY INC 10 Floor 14 Lane 609 Sec 5 Chung Hsin Rd San Chung City Taipei Hsien Taiwan 241 R O C TEL 886 2 29995155 FAX 886 2 29994960 C Copyright 2000 ATRIE TECHNOLOGY INC CONTENTS CHAPTER 1 INTRODUCTION Beats na An Se Aa 1 Package Contents 1 Modem Panel Description 2 DIP Switeh seen 3 CHAPTER 2 AT COMMAND GUIDELINES AT Command Set 6 CHAPTER 3 V 25bis COMMAND V 25bis Command sei mr 15 V 20bis Result Code me aan 16 CHAPTER 4 REGISTERS S Register Summary Hr ee 17 APPENDIX A SPECIFICATIONS 19 APPENDIX B RESULT CODES 21 CHAPTER 1 INTRODUCTION This manual is written for 33600bps dial up leased line modem Features Compatible with BELL 103 212A standards and ITU T V 21 V 22 V 23 V 22bis V 32 V 32bis V FC V 34 V 8 V 25bis V 42 V 42bis recommendation Provides MNP4 ITU T V 42 error correction and MNP5 ITU T V 42bis data compression Provides ITU T V 8 and Multi mode handshake according to ITU T recommendation Utilizes full duplex asynchronous transmission with a maximum effective throughput of 115200bps Provides 2 wire full duplex dial up line and leased line operation Asynchronous and s
7. CODES Short For Long Form m Standard Extended 0 OK 2 RING 5 NO CARRIER 4 ERROR 5 CONNECT 1200 6 NO DIALTONE BUSY NO ANSWER CONNECT 600 10 CONNECT 2400 11 CONNECT 4800 12 CONNECT 9600 COIN 14 CONNECT 12000 25 CONNECT 75TX 1200RX 48 CARRIER 4800 49 CARRIER 7200 21 CARRIER 19200 CARRIRE 21600 CARRIER 24000 54 55 56 63 CONNECT 26400 66 70 80 PROTOCOL NONE PROTOCOL ALT CELLULAR FCERROR 22 ME For your convenience cut form the dash line and put beside your modem DIP Switch 1 POSITION STATE DESCRIPTION POSITION STATE DESCRIPTION Line speed 300bps V 21 Bell 103 Power on operation Line speed 1200 75bps V 23 v 25bis operation Line speed 1200bps V 22 Bell 212A dumb mode operation Line speed 2400bps V 22 bis AT command operation Line speed 4800bps V 32 V 32 bis Line speed 7200bps V 32 bis Line speed 9600bps V 32 V 32 bis Synchronous operation Line speed 12000bps V 32 bis Asynchronous operation Line speed 14400bps V 32 bis Line speed 16800bps V 34 Line speed 19200bps V 34 Line speed 21600bps V 34 DTE speed 1200bps Line speed 24000bps V 34 DTE speed 2400bps Line speed 26400bps V 34 DTE speed 4800bps Line speed 28800bps V 34 DTE speed 7200bps Line speed follow DTE speed DTE speed 9600bps DTE speed 12000bps DTE speed 14400bps Read DIP switch 4 through 11 the DTE speed 16800bps
8. DTE speed selection and line speed DTE speed 19200bps selection Switches while power on or DTE speed 21600bps encontering of the ATZ command DTE speed 24000bps Read NVRAM for DTE speed and line s DTE speed 26400bps peed while power on or encontering DTE speed 28800bps of the ATZ command DTE speed 38400bps DTE speed 57600bps DIP Switch 2 DTE speed 115200bps POSITION STATE DESCRIPTION Answer Originate Leased Line Dial up The preset value shown as bold format 501100220102
9. M error correction results in the modem hanging up Forces amp 05 and S48 0 The AT K1 command can over ride the AT N4 command Selects MNP5 error correction mode Failure to make a n MNP error correction connection results in the mode m hanging up Forces amp Q5 S36 4 and S48 128 Serial Port Ring Indicator Control The ring indicator ON for the duration of the telephone call Turns OFF the ring indicator after the telephone call is answered Default Modem Status Display This command displays the active commend setting and lists the command Keyboard Interrupt Command 12 AT KO Enables keyboard interrupt during handshake Default AT K1 Disables keyboard interrupt during handshake AT MS Select Modulation The command format is AT MS lt mod gt lt automode gt lt min_rate gt lt max_rate gt lt CR gt For example AT MS 10 1 1200 14400 mod gt Parameter Definitions mod Modulation Possible Rates bps O V 21 300 1 V 22 1200 2 V 22bis 2400 1200 A V 23 1200 9 V 32 9600 4800 10 V 32bis 14400 12000 9600 7200 4800 1 V 34 33600 31200 28800 26400 24000 21600 19200 16800 14400 12000 9600 7200 4800 2400 64 BELL 103 300 69 BELL 212 11200 74 V FC 28800 26400 24000 21600 19200 16800 14400 cmod Parameter Definitions Automode Option Selected 0 Auto mode disable 1 Auto mode enable using V 8 or multi mode Default The following
10. TB1 ATDs String s 0 9 Manual Answer Force modem to go off hook and answer an incoming call Repeat Last Command There is no need to type lt Enter gt after the has typed the modem executes the last executed command immediately Select ITU T BELL Mode for 300 and 1200 bps only Selects ITU T Default Selects BELL Dial Description Dialing digits A B C D DTMF dialing digits AA vd rg espar 5 ATEn ATEO Ignored by modem pulse dial Tone dial Perform MNPIO link negotiation at 1200bps Enable power level adjustment during MNP10 link negotiation Re dial last number Reverse originate mode Dial NVRAM telephone number n 0 to 3 Wait for dial tone Wait for AT amp T ibongi tone for credit card dialing before continuing with the dial string Pause Return to command state Wait for quiet answer Flash hook Calling tone Echo Command Disables command echo 6 ATEI ATHn ATHO ATH1 ATIN ATIO ATI ATI2 ATIS ATI4 ATI5 ATI6 ATLn ATLO ATL2 ATL3 ATMn ATMO ATMI1 ATM2 ATM3 ATNn ATNO ATNI ATN3 ATOn ATOO ATO1 ATOn ATOO ATO1 ATSr n Enables command echo Default Hook on off On hook Off hook Identification Command Reports product code Reports ROM checksum Verify the checksum of ROM If correct reports OK if not reports ERROR Reports ROM revision Reports model name ROM revision issue date Reports region code Reports DATA PUMP revision Speaker Volume Contr
11. View Profiles and Stored Telephone Number This command shows the active configuration and fouruser profiles Store Current Configuration Saves current configuration at user profile n including commands and registers where n 0 3 Select Synchronous Clock Source Selects internal clock Default 10 AT amp X1 AT amp X2 AT amp Yn AT amp Zn m AT Cn AT CO AT C1 AT C2 AT C3 AT En AT EO AT EI AT E2 AT L AT Q AT Rn AT RO AT R1 AT An AT AO AT A1 AT A2 AT A3 AT Bn Selects external clock Selects slave receive clock Power On Profile Selection Command Recalls profile n when power on where n 0 3 Store Telephone Number The n indicates the telephone number locations where n 0 9 The m is a dial string refer to ATDs command of up to 35 characters This command must be the last one on a command line Data Compression Protocol Selection Disables data compression Enables MNP5 error correction Enables V 42bis data compression Enables both MNP5 and V 42bis data compression Default Retrain and Rate Negotiation Command Disables auto retrain feature Enables auto retrain feature Enables auto retrain and rate negotiation with fall back forward feature Default Line Signal Level Returns a value which indicates the received signal level For example 009 9 dBm 043 43 dBm and so on Line Signal Quality Reports the line signal quality The line quality is reported in three decim
12. al digits rang from 000 good to 128 poor Ring Back Message Command Disables ring back message Default Enables ring back message Select Maximum MNP Block Size The maximum MNP block size to be 64 characters The maximum MNP block size to be 128 characters The maximum MNP block size to be 192 characters Default The maximum MNP block size to be 256 characters Transmit Break to Remote AT F AT Gn AT GO AT G1 AT Nn AT NO AT N1 AT N2 AT N3 AT N4 AT N5 AT Rn AT RO AT R1 AT S AT Kn Transmit a break signal to the remote modem with a le ngth in multiples of 100 ms according to parameter n s pecified Where n 1 9 Default n 3 View Stored Telephone Number Reports the content of the ten stored telephone numbers Modem Port Flow Control Disables modem port flow control Default Enables modem port flow control Operating Mode Selects normal speed buffered mode Selects direct mode Forces amp 00 Selects reliable error correction mode The modem will first attempt a LAP M connection and then an MNP connection Failure to make a reliable connection results in the modem hanging up Forces amp Q5 S36 4 and S48 7 Selects auto reliable mode This operates the same as N2 except failure to make a reliable connection results in the modem falling back to the speed buffered normal mode Forces amp 05 S36 7 and S48 7 Default Selects LAP M error correction mode Failure to make a LAP
13. he user to issue and execute the AT command while in the V 25bis command mode V 25bis Result Code RESULT CODE CNX m VAL INV INC CFI m LSN m n DESCRIPTION Modem connects to the remote modem The m indicates the DCE speed Command valid and executed successfully Command error can not be executed Ring signal detected Failure of dialing the m represents the meanings below ET Line busy RT No answer CB Local modem busy NT No carrier NS Memory location is empty no telephone number stored AB Receive interrupt while dialing Display the stored telephone numbers m indicates the memory location of the telephone number n indicates the telephone number CHAPTER 4 REGISTERS S Register Summary REGISTER Function Default Rings to Auto Answer Rings Ring Counter Rings Escape Character ASCII Carriage Return Character ASCII Line Feed Character ASCII Backspace Character ASCII Wait Time for Dial Tone Sec Wait Time for Carrier Sec Pause Time for Dial Delay Sec Carrier Detect Response 1 Sec Time Delay for Hanging Up 1 Sec after Carrier Loss DTMF Duration and 001 Sec Spacing Escape Code Guard Time 02 Sec Bit Mapped Register Bit Mapped Register Test Timer AutoSync Bit Mapped Option AutoSync HDLC Address or BSC Sync Character Bit Mapped Register Bit Mapped Register Bit Mapped Register Delay to DTR RTS to CTS Delay Interval
14. lt Resets the modem on detecting ON to OFF transition of DTR Restore Factory Configration Profile Restore factory configration n where n 0 9 Select Guard Tone Disables guard tone Default Selects 550 Hz guard tone Selects 1800 Hz guard tone Serial Port Flow Control Disables flow control Enables unidirectional RTS CTS hardware flow control Enables unidirectional Xon Xorr software flow control Enables bi directional RTS CTS hardware flow control Default Enables bi directional XoN Xorr software flow control Enables transparent Xon Xorr software flow control Enables both RTS CTS and Xon Xorr flow control Enables bi directional DTR DSR hardware flow control Enables unidirectional DTR DSR hardware flow control Line Type Select PSTN line operation Default leased line operation Asynchronous Synchronous Mode Selection Selects asynchronous operation Default Selects synchronous data mode with Async off line command mode Selects synchronous data mode with Async off line command mode Same as amp M1 except that amp M2 enables DTR dialing of stored telephone number at location 0 The modem will disconnect if DTR is OFF for more than the time period in register S25 Selects synchronous data mode The call is manually in itiated while DTR is inactive The handshake is proceeding when DTR becomes active Select Pulse Dial Make Break Ratio AT amp PO AT amp PI AT amp P2 AT amp P3 AT amp On AT amp OO
15. ol Low speaker volume Default Medium speaker volume High speaker volume Speaker Control Speaker always off Speaker on until the modem receives a carrier Default Speaker always on Speaker off while dialing then on until the modem receives a carrier Set Multi or Fix Mode Handshake Fix mode handshake The connection speed depends on the DTE speed or register S37 Multi mode handshake Follows the recommendation of ITU T multi mode handshake It can automatically chan ge the line speed to make most efficient connection Default Same as ATNI but without V 23 mode Return to On Line Mode Returns on line data mode without a retrain Returns on line data mode with a retrain Result Code Command Enables the modem to report result codes Default Disables the modem to report result codes Read write S register ATSr n ATSr ATVn ATVO ATVO ATWn ATWO ATWI ATW2 ATXn ATXO ATXI ATX2 ATX3 ATX4 ATYn ATYO ATY1 ATZn AT amp Cn AT amp CO AT amp CI AT amp C2 AT amp Dn AT amp DO Sets S register r to the vale n Read the content of S register r Result Code Type Selects short digit form result codes Selects long verbose form result codes Default Negotiation Progress Message Command Upon connection reports the DTE speed Default Upon connection reports the line speed the error correction protocol and the DTE speed Upon connection reports the DCE speed Extended Re
16. on DIP Switch 8 LEDs indicator MR TR SO CD RD TD OH EC Provide Multi and Fix Mode Handshake with ITU T V 8 Multi Mode Handshake Loop Back Test Digital Analog Remote Digital with Test Pattern RTS CTS Hardware DTR DSR Hardware and XON XOFF Software Storage of 4 Configuration Profiles and 10 Telephone Numbers 35 Digits Each OUTPUT LEVEL LINE TYPE SIZE WEIGHT POWER SUPPLY INTERFACE Adjustable from O dBm to 31 dBm in 32 Steps for Leased Line Operation Adjustable from O dBm to 15 dBm in 16 Steps for Other Operations Dial Up PSTN and 2 Wire Leased Line Selectable Using AT Command or DIP Switch 161mm L x 127 5mm W x 37mm H 295 Gram Without AC Adapter AC 12V 800mA Line RJ 11 Terminal 25 Pin RS 232C D type Connector RS 232C PIN DEFINITION Pin V 24 EIA Description Direction 1 101 AA Protective Ground FG NA 7 102 AB Signal Ground SG NA 2 103 BA Transmitted Data TXD To DCE 3 104 BB Received Data RXD From DCE 4 105 CA Request to Send RTS To DCE 5 106 CB Clear to Send CTS From DCE 6 107 CC Data Set Ready DSR From DCE 20 108 CD Data Terminal Ready DTR To DCE 22 125 CE Ring Indicator RI From DCE 8 109 CF Received Signal Detector CD From DCE 24 13 DA Transmitter Signal Element To DCE Timing XTCLK 15 114 DB Transmitter Signal Element From DCE Timing TXCLK 17 15 DD Receiver Signal Element From DCE Timing RXCLK 20 APPENDIX B RESULT
17. sult Codes The modem ignores dial tone and busy tone when dialing Sends standard result codes when a connection is made The modem ignores dial tone and busy tone when dialing Sends extended result codes when a connection is made The modem detects dial tone when dialing Sends extended result codes when a connection is made The modem detects busy tone Sends extended result codes when a connection is made The modem detects dial tone and busy tone Sends extended result codes when a connection is made Default Long Space Disconnect Disables the long space disconnect feature Default Enables the long space disconnect feature Reset Command Reset and load restore profile n where n 0 3 The Escape Code The Escape Code forces the modem to the command mode from the data mode without releasing the line connection Serial Port DCD Control Sets CD always ON Sets CD to follow the state of carrier Default Sets CD ON except during disconnect 3 5 sec Serial Port DTR Control Assumes DTR ON AT amp DI AT amp D2 AT amp D3 AT amp Fn AT amp Gn AT amp GO AT amp GI AT amp G2 AT amp Kn AT amp KO AT amp KI AT amp K2 AT amp K3 AT amp K4 AT amp KS AT amp K6 AT amp K7 AT amp K8 AT amp Ln AT amp LO AT amp LI AT amp Mn AT amp MO AT amp MI AT amp M2 AT amp M3 AT amp Pn Enters command mode on detecting ON to OFF transition of DTR Goes ON HOOK on detecting ON to OFF transition of DTR Defau
18. table are the explanation of the MNP10 command set AT Mn Power Level Adjust Command AT MO Disables power level adjustment during MNP 10 link negotiation The AT MO command will allow the transmitter adjustment if cellular operation is requested by the remote modem Default AT M1 Enables power level adjustment during MNP 10 link negotiation NOTE AT M1 should not be used with 13 AT Hn AT HO AT H1 AT H2 AT Kn AT KO AT K1 AT On AT 00 AT O1 AT Mn AT En AT EO AT E1 AT H2 Link Negotiation Speed Link negotiation occurs at the highest supported speed Default Link negotiation occurs at 1200bps used primarily for establishing cellular connections Link negotiation occurs at 4800bps used primarily to negotiate an MNP 10 connection on less than average quality telephone lines MNP Extended Services Disables V 42 LAP M to MNP 10 conversion Default Enables V 42 LAP M to MNP 10 conversion Enable Fallback to V 22bis V 22 Disables fallback to 2400 bps V 22bis and 1200 bps V 22 Fallback is enabled only to 4800 bps Enables fallback to 2400 bps V 22bis and 1200 bps V 22 Default Initial Cellular Power Level Setting Parameter n Initial Cellular Power Level 0 26 dBm Default 1 30 dBm 2 10 10 dBm uf lt f lt 31 n dBm Compromise Equalizer Enable Command Disables the equalizer Enables the equalizer Default CHAPTER 3 V 25bis COMMAND V 25bis Command set CRN n CRS n PRN m n RLN DIC
19. ynchronous operation selectable on both DIP switch or AT command Provides auto dial auto answer redial and full call progress monitoring functions Provides Microcom Networking Protocol MNP Class 10 to ensure best performance during Cellular Phone communication Supports GIII Fax with EIA Class 1 and Class 2 command and ITU T V 17 Package Contents Carefully unpack the product package that you have received T he following is a checklist of the package The modem One AC power adapter One RJ 11 telephone cable One Useris Manual If there is any wrong missing or damaged part please contact your dealer Modem Panel Description Modem Front Panel Dial up eased line MR TR SQ CD RD TD OH EC Figure 1 1 Modem Front Panel LED Indicators MR Power and Test Indicator This LED indicator indicates three conditions 1 Flashes when the modem is error in power on self test 2 Lights ON when the power is applied to the modem 3 Flashes when the modem is in the loop back test TR Terminal Ready Lights up when the computer or terminal is ready to receive data SQ Signal Quality Indicates the signal quality of the telephone line Describes below ON Good FLASH Medium OFF Poor CD Carrier Detect Lights up when carrier signal from a remote modem is detected RD Receive Data Flashes when the local DTE receives data from the modem TD Transmit Data Flashes when the local DTE
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