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Appendix: Error Correction and Data Compression

90

MicroLink 33.6TQV /

MicroLink 28.8TQV / MicroLink 14.4TQ

Manual © 1997 ELSA GmbH

B

Error Correction and Data Compression

AT%C

The two following tables provide an overview of the interdependencies

AT-J

between the

AT%C

,

AT-J

and

AT\N

commands which you use to configure

AT\N

your modem to error correction and data compression methods.

Example:

The default configuration for the modem is

AT%C3

,

AT -J1

and

AT \N3

. In

the upper table this configuration is described as case

4

. Column

4

of the

lower table shows the error correction and data compression methods
possible for this setting (connection with V.42bis, V.42, MNP5, MNP4 or
without protocol).
The arrows pointing down in the lower table denote a fallback if the
respective mode is not supported by the remote modem.

\N0

\N1

\N2

\N3

\N4

\N5

\N6

-J0

-J1

%C0

0

0

2

16

9

14

10

5

%C1

0

0

3

1

15

14

10

11

%C2

0

0

2

16

7

13

8

12

%C3

0

0

3

1

4

13

8

6

0

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15 16

V.42bis

â

â â â

â â

V.42

â â â â â â â â â n

n â

MNP 5

â

â â

â

â

â

MNP4

â n n â n n â

â

n

n

â â

physical

*)

n

n

n n n n

n

n

*)

Physical connection (AT\N0 in normal mode

or

AT\N1 in direct mode)

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Summary of Contents for MicroLink 14.4TQ

Page 1: ...MicroLink 33 6TQV MicroLink 28 8TQV MicroLink 14 4TQ User s Manual Data Communications Computer Graphics ...

Page 2: ... to any of its products at any time ELSA GmbH is a DIN EN ISO 9001 certified company With the certificate of May 16 1995 the authorized certification institute TÜV CERT has confirmed the conformity of ELSA GmbH with the worldwide quality standard DIN EN ISO 9001 The certificate number of ELSA GmbH is 09 100 5069 Trademarks ELSA MicroLink is a registered trademark of ELSA IBM is a registered tradem...

Page 3: ... 2 The Escape Command 24 5 3 The AT Command Prefix 25 5 4 The Command Line Buffer 26 5 5 Description of AT Commands 27 5 6 Registers 49 5 7 Password Protection Automatic Callback and Remote Configuration 69 5 7 1 Password Protection 69 5 7 2 Modem Access Flags 70 5 7 3 Automatic Callback and Remote Configuration 71 5 8 Modem Result Codes 77 5 9 Fax Operation 82 5 9 1 Fax Command Sets 82 5 9 2 Data...

Page 4: ...croLink 33 6TQV MicroLink 28 8TQV MicroLink 14 4TQ Manual 1997 ELSA GmbH WinFax 96 OS 2 96 Telix 97 RIP 97 F Product Support 99 G Glossary 103 H Warranty Conditions 108 Index 110 British Telecom Application Form 114 ...

Page 5: ...ters on a keyboard For example CR means carriage return and BS means backspace Changes to this manual ELSA MicroLink modems are subject to continual further development It is therefore possible that the printed documentation does not correspond to the latest release However you will always find the latest information in the ELSA ONLINE Support BBS see page 99 for phone numbers Package contents Bef...

Page 6: ...Introduction 6 MicroLink 33 6TQV MicroLink 28 8TQV MicroLink 14 4TQ Manual 1997 ELSA GmbH Notes ...

Page 7: ... duplex not in the United Kingdom V 22bis 1200 bps duplex 2400 bps duplex V 23 1200 75 bps duplex 75 1200 bps duplex 1200 bps half duplex V 32 4800 bps duplex 9600 bps duplex V 32bis 4800 bps duplex 7200 bps duplex 9600 bps duplex 12 000 bps duplex 14 400 bps duplex MicroLink 33 6TQV V Fast Class 16 800 bps duplex MicroLink 28 8TQV only 19 200 bps duplex 21 600 bps duplex 24 000 bps duplex 26 400 ...

Page 8: ... similarly equipped modems MNP5 and V 42bis MicroLink 33 6TQV MicroLink 28 8TQV and MicroLink 14 4TQ also use the data compression methods MNP5 and V 42bis Using MNP5 the transfer rates can be doubled or even quadrupled in the case of V 42bis Therefore MicroLink 33 6TQV MicroLink 28 8TQV and MicroLink 14 4TQ can achieve effective transfer rates up to 115 200 bps or 57 600 bps respectively AT comma...

Page 9: ...vices MicroLink 33 6TQV MicroLink 28 8TQV and MicroLink 14 4TQ have been CE approved and thus guarantee n Immunity to interference according to EN 50082 Electromagnetic compatibility Generic immunity standard Part 1 Residential commercial and light industry n Low radio emission according to EN 55022 Electromagnetic compatibility of information technology and telecommunications equipment n Electric...

Page 10: ...Brief Description 10 MicroLink 33 6TQV MicroLink 28 8TQV MicroLink 14 4TQ Manual 1997 ELSA GmbH Notes ...

Page 11: ...s n Modem facility n Fax facility n Auto calling n Auto Answer n Hands free telephone facility à ATTENTION à Any other usage will invalidate the approval of the apparatus if as a result it then ceases to comply with the standards against which approval was gained In addition as the owner and or operator of this apparatus you should regard the following points n If you want to connect your modem to...

Page 12: ...e either loop disconnect signaling pulse dialing or DTMF signaling tone dialing only the performance of the DTMF signaling is subject to regulatory requirements for correct operation It is therefore strongly recommended that the equipment is set to use DTMF signaling for access to public or private emergency services DTMF signaling also provides a faster dialing process n Within private branch exc...

Page 13: ...n uw nieuwe ELSA MicroLink modem en uw computer dient u de volgende regels in acht te nemen n Om kontakt met gevaarlijke spanning van de telefoonlijn en of schade aan het modem te ver mijden dient het telefoonsnoer en de voedingskabel van het modem te worden verwijderd voor dat u de behuizing van het modem opent Normaliter dient de modem behuizing overigens niet geopend te worden n Een telefoon ve...

Page 14: ...nal modem to your terminal or computer This equipment like other electronic equipment generates and uses radio frequency energy If not installed and used according to the instructions in this manual this equipment may cause interference with your radio and television reception If you believe that this equipment is causing interference with your radio or television reception try turning the equipme...

Page 15: ...C registration number The Ringer Equivalence Number REN is used to determine how many devices can be connected to your telephone line In most areas the sum of the RENs of all devices on any line should not exceed five 5 0 If too many devices are attached they may not ring properly à ATTENTION à Changes or modifications not expressly approved by the party responsible for compliance could void the u...

Page 16: ...National Regulations 16 MicroLink 33 6TQV MicroLink 28 8TQV MicroLink 14 4TQ Manual 1997 ELSA GmbH Notes ...

Page 17: ...only the original external power supply shipped with your modem A power supply that has been opened or mechanically damaged should no longer be operated touching the primary voltage Europe 230 V USA 120 V with the hand or with metal parts results in an electric shock which can be deadly n The 9 VAC power input of the modem is a low voltage circuit touching this circuit with the hand or with metal ...

Page 18: ...icro MicroLink 33 6TQV The LEDs provide a status display and indicate the status of the interface lines see also page 93 Micro indicates the location of the microphone with which your can record messages to be used with the voice function Rear panel 1 2 3 Line Phone V 24 RS232C On Off AC 9V 4 5 No Description 1 2 3 4 5 On Off switch Power input V 24 RS 232C interface Line connector Telephone conne...

Page 19: ... board à ELSA TIP à For example ELSA offers the COMFAST serial interface board featuring two freely configurable serial ports each equipped with a 16550 UART When selecting the serial interface be aware of the corresponding IRQ settings especially for COM3 and COM4 Make sure that each IRQ is only used by one device otherwise hardware conflicts and PC malfunctions may occur For example it is common...

Page 20: ...he Driver from disk provided by hardware manufacturer option and click on OK The window Install from Disk is displayed Install software Insert the supplied ELSAsuite CD into the CD ROM drive and click on Browse The Open window will be displayed Select the CD ROM drive e g d and click on OK In the following Install from Disk window click on OK The files required files will now be copied onto hard d...

Page 21: ...ds of getting a dial tone Pressing the Flash key or dialing an escape digit e g 0 or 9 Pulse or tone dialing In addition you must know whether your telephone uses pulse or tone dialing This can normally be determined by listening to the dialing sound If you hear a rattling sound after each dialed number you have pulse dialing If you hear the touch tone beeps when dialing then you have tone dialing...

Page 22: ...This does not apply to the Netherlands where a dial tone is always provided and the ATX3 command has no effect Special dialing Details concerning special dialing characters which can be included in the characters dialing string e g for the dial tone are found in the description of the ATD dial command page 30 ...

Page 23: ... and the online state transmission state Command input After being switched on the modem is in the command state Commands execution can be accepted interpreted and executed in this state only After a successful connection with the other party the modem changes from the command state to the online state Returning to the command state and changing back again is possible even with an existing connect...

Page 24: ... redefined via the register S2 see page 50 Valid command line A valid command line begins with an AT or at and must be terminated with a Carriage Return CR see also section 5 5 page 27 The command A or a is not valid after the three Escape characters Also a valid command line in an Escape sequence is restricted to a maximum of 40 characters Valid Escape Upon the entry of the Escape sequence the da...

Page 25: ...e modem sets a DCE rate of 19 200 bps MicroLink 33 6TQV MicroLink 28 8TQV full duplex on the telephone side as well If you have set your terminal program to a bit rate which is not supported by your modem on the telephone side e g 115 200 bps an attempt is made to establish a connection at the next lowest transmission speed of which the modem is capable This process is bit rate adaptation Bit rate...

Page 26: ...ng CR each Command input in several command lines atm1 OK atl3 OK at v8 OK ats0 000 OK However it is also possible to enter these commands successively after a single introductory AT in a single command line and to terminate with a single CR Command input in one command line at m1 l3 v8 s0 000 OK For better legibility the individual commands can be separated by blank spaces Upon reaching the end o...

Page 27: ...and unless the modem result codes are disabled reported by the message RING verbose form or 2 abbreviated form à ATTENTION à If the automatic call acceptance function is enabled a call cannot be accepted manually i e with the ATA command as the line is disconnected upon the entry of any character except for line feed see register S0 page 49 However the line is not disconnected if bit 6 of register...

Page 28: ... therefore cause conflicts B ITU T or Bell transmission modes ATB0 Modem complies with ITU T standards V 21 V 22bis ATB1 Modem complies with Bell standards 103 212A not available in the UK This command determines whether your modem transmits at 300 or 1200 bps in compliance with the ITU T standards V 21 or V 22bis or according to the Bell standards 103 or 212A B DCE rate AT B300 300 bps AT B1200 1...

Page 29: ... Data buffering in the negotiation phase AT C2 No data buffering fallback character recognition AT A During a call acceptance with the setting AT N3 see page 38 the AT C command determines how the modem treats characters which are neither an MNP nor an LAPM request If no MNP or LAPM request is recognized within three seconds the modem falls back to normal mode In the setting AT C0 no buffering and...

Page 30: ... register S8 Dial pause 1 second Dial pause 3 seconds M Q V X Y Z Changing the operating mode only for the following connection V 42 mode AT N4 V 42 mode and fallback to normal mode AT N5 V 42 mode and fallback to MNP mode AT N6 V 42 or MNP and fallback to normal mode AT N3 MNP mode AT N2 Normal mode AT N0 L Sm m Dialing stored telephone numbers Redial the last number Dial a number stored in the d...

Page 31: ...s enabled and the state of the DTR interface line changes from OFF to ON the modem automatically dials the number stored in position 0 see commands AT P page 40 and AT Z page 48 D Delay before forced hang up AT Dn n 0 255 seconds default 0 The AT Dn command can be used to define a maximum delay during which the modem tries to empty its sending and receiving buffers before it terminates the connect...

Page 32: ...anges from OFF to ON It does not do so with the standard setting AT D0 D DSR CTS control AT D0 DSR and CTS always on AT D1 DSR follows answer tone CTS always on AT D2 DSR always on CTS follows DCD AT D3 DSR follows answer tone CTS follows DCD This command affects the meaning of the DSR and CTS interface lines If a hardware data flow control is employed see also AT Q command page 41 the setting of ...

Page 33: ...N DCD OFF at hangup DCD OFF at hangup DCD OFF at hangup DCD OFF at hangup DCD OFF at hangup DCD OFF at hangup DCD OFF at hangup DCD OFF at hangup E Command echo ATE0 Disable command echo ATE1 Enable command echo This command selects whether your modem echoes entered commands on the local screen or not If the echo is switched on and all characters appear twice on your monitor your communications pr...

Page 34: ...the DTE rate and can only be changed by AT B see page 28 G Set calling tone and guard tone AT G0 Calling tone on no guard tone not in the UK AT G1 Calling tone on guard tone 550 Hz AT G2 Calling tone on guard tone 1800 Hz default for the UK AT G4 Calling tone off no guard tone not in the UK default for USA AT G5 Calling tone off guard tone 550 Hz AT G6 Calling tone off guard tone 1800 Hz The guard...

Page 35: ... also page 52 à NOTE à To set the modem back to normal operation the AT H0 CR and AT F CR commands must be entered in two separate command lines I Display product information ATI0 Display product code in nnn format ATI1 Display checksum ATI2 Display checksum result ATI3 Display firmware version and date ATI4 Display current configuration profile ATI5 Display serial number ATI6 Display product name...

Page 36: ...blish an MNP connection before falling back to a physical connection In order to establish a V 42 connection AT J1 must be set An overview of the effects of AT J and AT N3 can be found in the description of the AT N command page 38 J Constant DTE rate AT J0 DTE rate independent of CONNECT bit rate AT J1 DTE rate depends on DCE rate With the AT J0 setting a constant bit rate is maintained between c...

Page 37: ... rate adaptation AT L1 V 100 bit rate adaptation AT L2 No fallback AT L3 V 100 bit rate adaptation This command controls the bit rate adaptation automatic speed matching during the establishment of a connection With AT L1 default setting and with AT L3 the MicroLink 33 6TQV MicroLink 28 8TQV and MicroLink 14 4TQ operate in accordance with the ITU T standard V 100 Modems complying with this standar...

Page 38: ...pends on the setting of the AT V command see page 45 With AT M1 the following result codes are displayed upon successful connection regardless of the setting of the AT V command and the transmission bit rate MNP1 4 connection CONNECT MNP MNP5 connection CONNECT MNP5 V 42 connection CONNECT LAPM V 42bis connection CONNECT LAPM V42BIS M V 8 bit rate adaptation MicroLink 33 6TQV and MicroLink 28 8TQV...

Page 39: ...mal mode is re established The AT J command determines whether the modem only tries to establish a connection with MNP or also with V 42 see page 36 When set to AT N4 the modem attempts to establish an error corrected connection with V 42 If this is not possible the connection is aborted With the settings AT N5 and AT N6 the modem first attempts to establish an error corrected connection with V 42...

Page 40: ... volatile memory of the modem with this command The ATD m command see page 30 dials the telephone number n max 36 digits stored in the m th position m 0 9 The numbers are kept in the memory even when the modem is switched off A number stored in position m can be deleted with the AT Pm command The rules applying to n are the same as explained on page 30 à ATTENTION à The numbers stored with AT P ca...

Page 41: ...o Send interface lines If the RTS control line is set to OFF data output to the computer is stopped Switching to ON resumes the output of the received data If the modem continues to receive data from the telephone line the data are temporarily stored in a receiving buffer If the sending buffer is full the modem sets the message line CTS Clear To Send to OFF to stop the data output from the compute...

Page 42: ...id value the command is ignored and answered with ERROR If invalid settings are made in a bit mapped register only the invalid bits are ignored all other bits are accepted S DSR control AT S0 DSR is always active AT S1 DSR is active between answer tone and hang up This command influences the meaning of the DSR signal line see also page 93 This interface line is normally always active When set to A...

Page 43: ...LOOPBACK OFF OFF V100 OFF ON OFF M1 J0 L1 B0 E1 T4 Press any key to continue 3 PROTOCOLS MODEM MODE COMPRESSION DETECT PHASE BREAK CONTROL FALLBACK CHARACTER FALLBACK MODE NORMAL ALL ON 005 000 FB 200 N0 C3 J1 K5 A0 C1 Press any key to continue 4 HOST INTERFACE SERIAL BPS DATA FORMAT PARITY TRANSMIT XON XOFF DATA FLOW CONTROL DSR CTS CONTROL CARRIER DETECTION ESCAPE CHARACTER EFFECT OF DTR MEANING...

Page 44: ...ack The loopback is initiated by the remote modem In this state the characters sent by the remote modem are not transmitted to the host but instead returned directly to the remote modem The AT T6 command enables a remote digital loopback if the remote modem is set to AT T4 In this mode the remote modem does not pass the received characters to its host computer but instead returns them directly to ...

Page 45: ...or corrected connections AT V0 No modified CONNECT messages AT V1 Identification of error corrected connections AT V2 Identification of MNP and V 42 bis connections AT V8 Identification of MNP V 42 and V 42bis connections This command controls the CONNECT messages for error corrected connections connections with MNP V 42 or V 42bis With AT V0 modified CONNECT messages are always suppressed The CON...

Page 46: ...dem configuration in the non volatile memory of the modem Two different configuration profiles 0 and 1 can be stored The current values of the following commands and registers are saved A B B C C C D D D E E G G H J J K L L M M N P Q Q S S T T4 T5 T V V X X S0 S14 S15 S18 S21 S22 S23 S25 S26 S27 S28 S30 S31 S32 S33 S34 S36 S37 S38 S39 S42 S46 S47 S48 S51 S52 S64 S93 S95 à ATTENTION à Registers who...

Page 47: ...E à With the ATX0 setting only the message CONNECT or 1 in short form is displayed regardless of the transmission bit rate and the type of connection X Handling of XON XOFF characters AT X0 XON XOFF characters are not passed to the remote side AT X1 XON XOFF characters are passed to the remote side This command influences the handling of the characters XON and XOFF which serve for data flow contro...

Page 48: ... n Store telephone number n in position m Up to twenty telephone numbers can be stored in the non volatile memory of the modem with this command The ATDSm command see page 30 dials the telephone number n max 36 digits stored in the m th position m 0 19 The numbers are kept in the memory even when the modem is switched off A number stored in position m can be deleted with the AT Zm command The rule...

Page 49: ...TS14 command to display the current value of register S14 current value 138 n Add the decimal value of bit 6 1 decimal value 26 64 to the current register value new register value 138 64 202 n Set register S14 to the new value 202 with the ATS14 202 command This will set bit 6 of S14 to 1 without affecting the other bits à NOTE à To make the new value remain valid even after the modem is switched ...

Page 50: ...acter Valid values 0 255 decimal Default value 43 Storage in non volatile memory AT W The Escape command see also section 5 2 page 24 which is used to change from the online state to the command state in an existing connection can be redefined in register S2 à NOTE à Changing to the command state is locked by the value 0 or values 128 S3 Carriage Return character Valid values 0 127 decimal Default...

Page 51: ...carrier Valid values 10 100 seconds in the UK 10 59 Default value 90 seconds in the UK 59 seconds Storage in non volatile memory AT W The amount of time that the modem waits for the carrier after dialing is set in register S7 S8 Pause length of Valid values 0 8 seconds Default value 2 seconds Storage in non volatile memory AT W The length of a dialing pause caused by the dialing character see page...

Page 52: ...o section 5 2 page 24 S14 Bit mapped options The contents of register S14 can be stored in the non volatile memory using the AT W or AT W command The individual bits have the following meaning Bit Dec Meaning 0 0 none 1 0 2 0 command echo disabled ATE0 1 command echo enabled ATE1 2 0 4 0 result codes enabled ATQ0 1 result codes disabled ATQ1 3 0 8 0 short form result codes digits ATV0 1 long form ...

Page 53: ... bits have the following meaning Bit Dec Meaning 0 2 0 none 3 4 0 8 16 24 0 ignore DTR status change AT D0 1 change to command state if DTR OFF AT D1 2 hang up if DTR OFF AT D2 3 reinitialization if DTR OFF AT D3 5 0 32 0 DCD signal is always active ON AT C0 1 DCD signal indicates existence of carrier AT C1 6 7 0 none S22 Bit mapped options The contents of register S22 can be stored in the non vol...

Page 54: ...te digital loopback allowed AT T4 1 31 0 2 4 6 8 10 12 14 0 DTE rate 300 bps 1 DTE rate 600 bps 2 DTE rate 1200 bps 3 DTE rate 2400 bps 4 DTE rate 4800 bps 5 DTE rate 9600 bps 6 DTE rate 19 200 bps 7 DTE rate 38 400 bps 4 51 0 16 32 48 0 7E1 1 8N1 2 7O1 3 7N2 6 7 0 64 128 0 guard tone off not in the United Kingdom AT G0 AT G4 1 guard tone 550 Hz AT G1 AT G5 2 guard tone 1800 Hz default for the Uni...

Page 55: ...er 2 word length in asynchronous direct mode AT N1 10 bits character 3 word length in asynchronous direct mode AT N1 11 bits character 2 3 0 4 8 12 0 partial bit rate adaptation AT L0 1 V 100 bit rate adaptation on AT L1 2 no fallback AT L2 3 V 100 bit rate adaptation on AT L3 4 0 reserved 5 0 32 0 bit rate tolerance 2 5 1 0 1 bit rate tolerance 2 5 2 3 6 0 64 0 Disable automatic retrain AT E0 1 E...

Page 56: ...age in non volatile memory AT W or AT W The period of time after which the modem automatically terminates the connection if no further data have been received or sent can be set in register S30 see also AT T command page 44 A value of zero disables the inactivity timer S31 Bit mapped options The contents of register S31 can be stored in the non volatile memory using the AT W or AT W command The in...

Page 57: ...the configuration command which is used to change from the online state to the remote configuration state S35 Number of Callback Attempts Valid values 1 99 Default value 3 Storage in non volatile memory AT W In Register S35 the number of times your modem attempts to call back can be defined S36 Error correction In Register S36 you can select which type of error correction if any is to be used The ...

Page 58: ...s AT B75 1200 2 DCE rate 1200 75 bps AT B1200 75 3 DCE rate 300 bps AT B300 5 DCE rate 1200 bps AT B1200 6 DCE rate 2400 bps AT B2400 7 DCE rate 4800 bps AT B4800 8 DCE rate 7200 bps AT B7200 9 DCE rate 9600 bps AT B9600 10 DCE rate 12 000 bps AT B12000 11 DCE rate 14 400 bps AT B14400 12 13 14 15 16 17 18 19 12 DCE rate 16 800 bps 1 AT B16800 13 DCE rate 19 200 bps 1 AT B19200 14 DCE rate 21 600 ...

Page 59: ... 0 03 seconds Storage in non volatile memory AT W or AT W In half duplex mode CTS follows the state of RTS When RTS changes from OFF to ON the modem waits for the time defined in register S39 before CTS is set to ON as well S42 Waiting for user password Valid values 20 120 seconds Default value 30 seconds Storage in non volatile memory AT W Register S42 defines the period of time the modem waits f...

Page 60: ...annot be used because these characters are needed in the V 42 negotiation phase and would therefore cause conflicts S48 Bit mapped options The contents of register S48 can be stored in the non volatile memory using the AT W or AT W command The individual bits have the following meaning Bit Dec Meaning 0 1 0 reserved 2 0 4 0 Detect phase off AT J0 1 Detect phase on AT J1 3 4 0 8 16 0 no data buffer...

Page 61: ...DSR always active CTS follows DCD AT D2 3 DSR follows answer tone CTS follows DCD AT D3 2 3 0 4 8 0 DCD is always active ON AT C0 1 DCD indicates presence of carrier AT C1 2 DCD dropped only during hang up AT C2 4 7 0 reserved S53 Bit mapped options Register S53 sets the data format between computer and modem This setting is independent of the data format on the telephone side which is always 8N1 ...

Page 62: ... the commands AT W or AT W The individual data bits have the following meanings Bit Dec Meaning 0 0 1 0 Symbol rate 2400 bps off max 21 600 bps 1 Symbol rate 2400 bps on 1 0 reserved 2 0 4 0 Symbol rate 2800 bps off max 24 000 bps 1 Symbol rate 2800 bps on 3 0 8 0 Symbol rate 3000 bps off max 26 400 bps 1 Symbol rate 3000 bps on 4 0 16 0 Symbol rate 3200 bps off max 33 600 bps 1 Symbol rate 3200 b...

Page 63: ...ction termination after 30 seconds Normal disconnect initiated by the remote modem Remote modem is no longer answering disconnect after 10 re transmissions Protocol violation Compression error Inactivity time has elapsed No loop current not in the United Kingdom and USA Busy tone detected No dial tone detected No answer tone detected time out S7 No connection reached time out or wrong modulation t...

Page 64: ...ine transmit bit rate 16 800 bps 1 13 DCE line transmit bit rate 19 200 bps 1 14 DCE line transmit bit rate 21 600 bps 1 15 DCE line transmit bit rate 24 000 bps 1 16 DCE line transmit bit rate 26 400 bps 1 17 DCE line transmit bit rate 28 800 bps 1 18 DCE line transmit bit rate 31 200 bps 2 19 DCE line transmit bit rate 33 600 bps 2 5 0 reserved 6 0 64 0 no fax connection 1 fax connection establi...

Page 65: ... bps 1 13 DCE line receive bit rate 19 200 bps 1 14 DCE line receive bit rate 21 600 bps 1 15 DCE line receive bit rate 24 000 bps 1 16 DCE line receive bit rate 26 400 bps 1 17 DCE line receive bit rate 28 800 bps 1 18 DCE line receive bit rate 31 200 bps 2 19 DCE line receive bit rate 33 600 bps 2 5 7 0 32 64 96 128 160 192 224 0 modulation type V 23 1 modulation type V 21 2 modulation type V 22...

Page 66: ... options The contents of register S95 can be stored in the non volatile memory using the AT W or AT W command The individual bits have the following meaning Bit Dec Meaning 0 3 0 1 2 8 0 no modified CONNECT messages AT V0 1 indication of error corrected connections AT V1 2 differentiation MNP V 42 AT V2 8 differentiation MNP V 42 V 42bis AT V8 4 0 16 0 CONNECT messages dependent on AT V AT M0 1 CO...

Page 67: ...ximum allowed delay between received ring tones is set in register S99 Usually the standard value of 5 seconds need not be changed If however ring pulses are sent at longer intervals in a telecommunications service network increasing the maximum delay in register S99 prevents the ring counter see register S1 from being reset to zero after each ring S130 Bit mapped fax options Register S130 control...

Page 68: ...it Dec Meaning 6 0 64 0 CTS and XON XOFF handshake if no AT Q command Class 1 Class 2 only 1 CTS and XON XOFF handshake after AT Q command Class 1 Class 2 only 7 0 128 0 fax operation according to V 33 V 17 V 29 and V 27ter possible 1 fax operation according to V 33 V 29 and V27ter possible ...

Page 69: ...s flags can be used to define which modem functions may be used see page 70 An authorized modem user must identify himself by entering the supervisor password to access the modem functions The factory default supervisor password is ELSA It can be changed with the AT Y command see page 69 The password must have at least four but no more than eight characters Valid characters are digits upper case l...

Page 70: ...played as Example at s PASSWORD CONFIG A IOP SET AIO CONFIG A IO OK Access flags can only be changed by authorized users who enter the correct supervisor password Any combination of the following access flags can be used Flag Meaning A All commands which do not change the non volatile memory may be used All W The commands AT P AT P AT W AT W AT Y and AT Z may be used Write I Incoming calls can be ...

Page 71: ...the semicolon e g at p0 t0w position This parameter followed by at least one more parameter defines the position 1 19 in the non volatile memory where the respective entry is to be stored If for example an entry is to be stored in the fourth position the number 4 must be entered e g at p4 1 kirk 1701 Existing entries can be modified by entering the respective parameter thus overwriting the old set...

Page 72: ...ter can be used to save a phone number of up to 32 characters along with the user password in the list R Display user password and parameters AT R The AT R command displays the stored user passwords callback numbers and all other parameters on the screen Example at r 00 T0W 01 05 VERA 38317 02 05 JOERG 38317 03 04 01 BARNU 05 06 33 SCOTTY 1701 07 35 ESTHER 1234567 08 37 MCCOY 1701 09 10 11 12 à NO...

Page 73: ...mber Example ELSA MICROLINK PASSWORD PHONE NUMBER PASSWORD OK If the entries are correct the message PASSWORD OK is displayed and the called modem immediately terminates the connection After the time set in register S43 see page 59 the phone number stored along with the user password is called automatically The modem will not enter the transparent mode before the remote user has entered his user p...

Page 74: ...lowed by the entries of the remote modem user password and phone number à NOTE à xon and xoff represent the respective handshake signals depending on the setting of the AT Q command see page 41 If the password protection or the automatic callback function is active the following messages can be displayed at the remote modem PASSWORD The entered password is echoed on the screen PHONE NUMBER The ent...

Page 75: ...Configuration The configuration command is only recognized in the online transmission command state Valid command A valid command line begins with an AT or at and is terminated with Enter line The A or a command is not valid after the configuration command Also a valid command line is limited to 40 characters The user at the remote modem is prompted to identify himself by entering his user passwor...

Page 76: ...e the settings are only valid within the current remote configuration session To keep the changes after the modem is switched off the configuration profile must also be saved in the non volatile memory with the AT W or AT W command X Exit remote configuration AT X Exit remote configuration Upon the AT X command the modem leaves the remote configuration mode and returns to the online online state R...

Page 77: ... the modem sends the result codes in short form as a number followed by CR V1 V0 Meaning OK 0 Command line executed RING 2 Incoming call NO CARRIER 3 No connection reached or carrier lost for longer than 10 seconds ERROR 4 Error in entered command NO DIALTONE 6 No dial tone detected DIAL LOCKED 6 Dial function locked not in all countries BUSY 7 Telephone line busy NO ANSWER 10 Remote modem or fax ...

Page 78: ...T 1200 HX CONNECT 75 1200 CONNECT 1200 75 1 5 10 11 16 12 13 14 110 111 112 113 114 115 116 117 51 52 53 n n n n n n Transfer bit rate 300 33 600 bps duplex no error correction data compression Transfer bit rate 1200 bps CONNECT 1200 HX CONNECT 300 CONNECT 1200 CONNECT 2400 CONNECT 4800 CONNECT 7200 CONNECT 9600 CONNECT 12000 CONNECT 14400 CONNECT 16800 CONNECT 19200 CONNECT 21600 CONNECT 24000 CO...

Page 79: ... REL MNP CONNECT 4800 REL MNP CONNECT 7200 REL MNP CONNECT 9600 REL MNP CONNECT 12000 REL MNP CONNECT 14400 REL MNP CONNECT 16800 REL MNP CONNECT 19200 REL MNP CONNECT 21600 REL MNP CONNECT 24000 REL MNP CONNECT 26400 REL MNP CONNECT 28800 REL MNP CONNECT 31200 REL MNP CONNECT 33600 REL MNP 20 22 23 31 35 33 37 39 131 133 135 137 139 141 143 145 n n n Transfer bit rate 300 33 600 bps duplex with M...

Page 80: ...00 MNP5 CONNECT 2400 MNP5 CONNECT 4800 MNP5 CONNECT 7200 MNP5 CONNECT 9600 MNP5 CONNECT 12000 MNP5 CONNECT 14400 MNP5 CONNECT 16800 MNP5 CONNECT 19200 MNP5 CONNECT 21600 MNP5 CONNECT 24000 MNP5 CONNECT 26400 MNP5 CONNECT 28800 MNP5 CONNECT 31200 MNP5 CONNECT 33600 MNP5 71 72 73 74 75 76 77 78 170 171 172 173 174 175 176 177 n n n Transfer bit rate 300 33 600 bps duplex with MNP class 5 CONNECT 120...

Page 81: ...NECT 24000 LAPM V42BIS CONNECT 26400 LAPM V42BIS CONNECT 28800 LAPM V42BIS CONNECT 31200 LAPM V42BIS CONNECT 33600 LAPM V42BIS 92 93 94 95 96 97 98 190 191 192 193 194 195 196 197 n n n Transfer bit rate 300 33 600 bps duplex with V 42bis CONNECT n n n n n n Any bit rate without MNP and V 42 CONNECT MNP n n n n n n with MNP class 1 4 CONNECT MNP5 n n n n n n with MNP class 5 CONNECT LAPM n n n n n...

Page 82: ...f WinFax PRO 4 0 A brief description of the Class 1 fax commands supported by the ELSA MicroLink modems is available in the MODEMS forum file area of the ELSA ONLINE Support BBS phone number on page 99 5 9 2 Data Flow Control in Fax Operation By default the modems described in this manual are capable of using both hardware and software handshake simultaneously in fax Class 1 and Class 2 as long as...

Page 83: ...her settings if necessary Result codes for incoming fax call RING Incoming call FAX Detection of fax calling tone 1100 Hz FCON Fax connect message Result codes for incoming data call RING Incoming call DATA Detection of data calling tone 1300 Hz CONNECT Data connect message Class 1 Modem initialization at fclass 1 Enter Class 1 fax mode at fae 1 Set adaptive answer mode fax data auto mode Other se...

Page 84: ...ge 99 If you play old voice files with your modem and you find that these files sound distorted this may be due to an older recording method where the byte order of the voice data is reversed You can select both methods via register S229 as described below S229 Byte order for saved voice data Valid values 0 or 1 decimal Default value 0 new method Storage in non volatile memory AT W Register S229 c...

Page 85: ...Operation MicroLink 33 6TQV MicroLink 28 8TQV MicroLink 14 4TQ Manual 1997 ELSA GmbH 85 Notes ...

Page 86: ...E rate 9600 bps DCE rate 12 000 bps DCE rate 14 400 bps DCE rate 16 800bps MicroLink 33 6TQV 28 8TQV only DCE rate 19 200 bps MicroLink 33 6TQV 28 8TQV only DCE rate 21 600 bps MicroLink 33 6TQV 28 8TQV only DCE rate 24 000 bps MicroLink 33 6TQV 28 8TQV only DCE rate 26 400 bps MicroLink 33 6TQV 28 8TQV only DCE rate 28 800 bps MicroLink 33 6TQV 28 8TQV only DCE rate 31 200 bps MicroLink 33 6TQV o...

Page 87: ...G1 DCE rate determined by DTE rate DCE rate set with AT B G0 G1 G2 G4 G5 G6 Calling tone on no guard tone not in the United Kingdom Calling tone on guard tone 550 Hz Calling tone on guard tone 1800 Hz default for the United Kingdom Calling tone off no guard tone not in the United Kingdom default for USA Calling tone off guard tone 550 Hz Calling tone off guard tone 1800 Hz H0 H1 Terminate connecti...

Page 88: ...V 42 MNP normal V 42 V 42 normal V 42 MNP O0 O1 Return to online state without retrain Return to online state with retrain P Set pulse dialing P Enter and save user password and callback number Pmn Store telephone numbers m 0 9 Q0 Q1 Q2 Enable modem result codes Disable modem result codes Disable modem result codes in answer mode Q0 Q1 Enable CONNECT message after invalid Escape sequence Disable C...

Page 89: ...red configuration profiles V0 V1 V2 V8 No modified CONNECT messages Identification of error corrected connections Identification of MNP and V 42 bis connections Identification of MNP V 42 and V 42bis connections W0 W1 Store configuration profile 0 Store configuration profile 1 W0 W1 Store extended configuration profile 0 Store extended configuration profile 1 X0 X1 X2 X3 X4 Ignore dial tone busy t...

Page 90: ...his configuration is described as case 4 Column 4 of the lower table shows the error correction and data compression methods possible for this setting connection with V 42bis V 42 MNP5 MNP4 or without protocol The arrows pointing down in the lower table denote a fallback if the respective mode is not supported by the remote modem N0 N1 N2 N3 N4 N5 N6 J0 J1 C0 0 0 2 16 9 14 10 5 C1 0 0 3 1 15 14 10...

Page 91: ...Command state stand by 350 mA approx 350 mA approx 240 mA approx Sleep mode power down 250 mA approx 250 mA approx 160 mA approx Power input Online state connection 9 2 VA approx 9 2 VA approx 8 5 VA approx Command state stand by 6 0 VA approx 6 0 VA approx 5 6 VA approx Sleep mode power down 5 1 VA approx 5 1 VA approx 4 7 VA approx Design Desktop model with metal housing Dimensions 108 x 38 x 14...

Page 92: ... 28 8TQV MicroLink 14 4TQ Manual 1997 ELSA GmbH International Connector Types Connector for Belgium Connector for the Netherlands Connector for the UK Connector for the USA and Spain RJ11 socket pin assignment 1 2 3 4 5 6 Line Telephone socket 1 b2 2 b 3 a 4 a2 5 6 ...

Page 93: ...modem 4 7 20 4 DTR RTS 108 105 S1 S2 Data Terminal Ready Request to Send terminal modem terminal modem U housing shield The interface lines have the following meaning Computer terminal DTR Data Terminal Ready ready for operation The effect of this control line on the modem is determined by the AT D command see page 31 Request data from RTS Request To Send the modem The effect of this control line ...

Page 94: ... your communications program set to the correct serial interface COM port i e the one your modem is connected to n Is the IRQ used by this COM port set in the communications software as well You can use the supplied diagnostic program MODEMTST EXE to check the IRQ setting of your serial interface n Is the DTE rate serial port bit rate of your communications program set to a value within the speed ...

Page 95: ...xtension within the telephone system no dial tone is present In this case use the dial command ATX3DT number or ATX3DP number respectively The X3 parameter tells the modem not to wait for a dial tone You can make this setting permanent with the ATX3 W command I am dialing from an extension of a telephone system and though the line is not busy I always get a BUSY message from the modem What is the ...

Page 96: ...oor throughput rate is caused by constant CRC errors Check that your computer BIOS settings for the entry IDE HDD BLOCK MODE are set to DISABLED WinFax What should be considered when using the Delrina WinFax software The WinFax PRO package includes the test software DELTEST which classifies ELSA modems as Class 1 modems As ELSA MicroLink modems also support Class 2 fax commands we recommend that y...

Page 97: ...imes higher than the DCE rate if the DTE rate is set to 115 200 bps or 57 600 bps respectively 4 x 28 800 115 200 4 x 14 400 57 600 Therefore it is recommended to set the DTE rate to 115 200 bps for MicroLink 28 8TQV and 57 600 bps for MicroLink 14 4TQ I get many CRC errors when transferring files with Telix for DOS What can be the reason A common reason for frequent CRC errors is an improperly se...

Page 98: ...ently Asked Questions 98 MicroLink 33 6TQV MicroLink 28 8TQV MicroLink 14 4TQ Manual 1997 ELSA GmbH with RIP supporting terminal programs like RIPterm freeware available in the ELSA ONLINE BBS for download or Telix for Windows ...

Page 99: ...r description To be certain try to reproduce the error at least three times and exactly describe the steps you took to deliberately trigger the error n Use the supplied diagnostic software MODEMTST EXE to test your MicroLink modem The latest version of MODEMTST is always available in the ELSA ONLINE Support BBS for download Who to contact First you should contact the dealer or firm where you bough...

Page 100: ...BS has been established as a service for customers and other persons interested in ELSA products modems ISDN products and graphics boards The Support BBS is divided into product specific forums which are structured similar to file directories In these forums you can exchange experiences with other users and ask questions to the ELSA Support team Furthermore the Support BBS always holds the latest ...

Page 101: ...uld register as soon as possible To register you can call the ELSA Support BBS at any time 24 hours a day When logging in for the first time you will give yourself a password 4 to 10 characters You are then an unregistered user with very limited rights You cannot access the product forums before your registration The registration is performed via the menu item REGISTER and is at no additional cost...

Page 102: ... or the CompuServe registration please contact the toll free CompuServe support directly Repair If you are not sure whether your modem is defective or maybe only the configuration is wrong please call the ELSA Hotline before you send us the modem for repair If you want to send in the modem for repair please use suitable packing material and the original box to prevent damage to the modem during tr...

Page 103: ... synchronous transmission it is comparatively easy to perform AT command set Intelligent modems are able to establish connections and accept calls automatically This requires a set of modem control commands The extended AT command set AT command prefix ATtention has become a world wide standard for the syntax of these commands All ELSA modems are equipped with an automatic dialing device and can a...

Page 104: ...are hardware control using the signals RTS and CTS and software control using the characters XON and XOFF ELSA modems featuring error correction are capable of both methods for data flow control Data format To allow a data exchange between two stations in an asynchronous transmission the parties must agree on the length and structure of the bytes to be transferred This specification is called data...

Page 105: ...es out certain functions for other units e g terminals for instance saving of data ITU T The Telecommunications Standardization Sector of the International Telecom munications Union ITU is working on the standardization of data and telephone services The ITU T standards of the V series mainly deal with data transmission across telephone networks The ITU T is the successor organization of the CCITT...

Page 106: ...erefore in data communications normally no parity is selected which besides results in an increase of the transmission speed since no additional parity bit has to be sent Pulse dialing In this dialing method which is also called loop disconnect dialing each dialed digit is coded with a number of pulses So if you hear a rattling sound when dialing it is pulse dialing This method requires less techn...

Page 107: ...42 and V 42bis describe an error correction and data compression method respectively V 42bis includes a data compression protocol that can increase the effective transfer rate by a factor up to four MicroLink 28 8TQV and MicroLink 14 4TQ support besides MNP both V 42 and V 42bis Thus effective transfer rates of up to 115 200 bps or 96 000 bps respectively can be achieved XModem XModem is a transmi...

Page 108: ...ty claims must be made immediately at the latest within a period of 7 days b In the case of any externally visible damage arising from transport e g damage to the housing the transport company representative and ELSA should be informed immediately On discovery of damage which is not externally visible the transport company and ELSA are to be immediately informed in writing at the latest within 7 d...

Page 109: ...igence Claims for compensation of lost profits indirect or consequential detriments are excluded ELSA is not liable for retrieval of lost data unless ELSA employees intentionally or by culpable negligence caused its loss and the purchaser has guaranteed that the data can be retrieved with justifiable effort from data material kept in machine legible form b The warranty is valid only for the first ...

Page 110: ...ck 57 68 70 71 Callback delay 59 Callback log 57 Callback number saving 70 Callback automatic 8 Callback enabling 72 Calling tone 34 56 Carriage return character 50 Carrier 29 51 53 61 76 Carrier loss 51 CCITT 104 CE approval 9 Clear down sequence 56 COM port 93 Command echo 33 Command line buffer 26 Command state 23 24 26 31 40 50 53 57 Communications program 20 33 Communications software 23 103 ...

Page 111: ...lay 31 58 FullFax 104 Guard tone 34 54 56 Half duplex 33 55 103 Handshake 41 47 61 94 96 Handshake method fax 81 Hang up after carrier loss 51 Hang up delay 31 58 Hang up command 34 Hang up reasons 63 HDTP approval 13 Help 98 Host 104 Inactivity timer 44 56 Initialization string 93 Installation 19 Interface lines 32 41 92 Interference 14 IRQ 93 ITU T 28 55 64 104 Level 62 Line Feed character 50 Lo...

Page 112: ... bit 25 Stop bits 25 Stored telephone numbers 40 48 Stored telephone numbers display 33 Supervisor password 8 68 Supervisor password changing 68 Support 98 Support BBS 99 102 SysOp 105 T 4 data 67 TAE6 N plug pin assignment 91 Telephone number 21 30 Telix 93 96 103 105 106 Terminal program 23 Testing 44 Tone dialing 21 30 44 52 105 Trace mode 72 Transfer rate 8 104 Transmission mode 23 28 Transmis...

Page 113: ...Appendix Index MicroLink 33 6TQV MicroLink 28 8TQV MicroLink 14 4TQ Manual 1997 ELSA GmbH 113 ...

Page 114: ...he appropriate connection socket installed Please don t forget to enter your modem s Approval Number which is printed on the label placed on the modem housing Please refer to section 3 1 of this manual for further information on national regulations for your modem To British Telecom I am now the owner of an r ELSA MicroLink 28 8TQ modem r ELSA MicroLink 28 8TQV modem r ELSA MicroLink 14 4TQ modem ...

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