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Chapter 7

MNP and V.42

2

The internal modem has built-in protocols MNP (Microcom
Networking Protocol) Class 4 and V.42 for error correction
and MNP class 5 and V.42bis for data compression.

Error-correction overview

Telephone line noise, or electrical interference, can cause
errors in data communication. Noise is especially a problem
at high speeds of 14,400 bps or greater.

The MNP and V.42 protocols were developed to ensure
reliable data communications despite the high probability of
error generation from line noise.

MNP error correction

MNP was developed by Microcom. MNP class 4 enables data
correction of full-duplex communications and also provides
asynchronous/synchronous conversion and data packet-size
negotiation to increase throughput.

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Summary of Contents for V.9256K

Page 1: ...5 375 x 8 375 ver 2 4 0 TOSHIBA C6628 0702M1 V 9256K InternalModem User sGuide ...

Page 2: ... measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment to an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help NOTE Only peripherals complying with the FCC Class B limits may be attached to this modem Operation with non compliant ...

Page 3: ...ed on standard device telephone lines Connection to telephone company provided coin service central office implemented systems is prohibited Connection to party lines service is subject to state tariffs If you have any questions about your telephone line such as how many pieces of equipment you can connect to it the telephone company will provide this information upon request Telephone company pro...

Page 4: ...der to program this information into your fax modem you should complete the setup of your fax software before sending messages Instructions for IC CS 03 certified equipment 1 NOTICE The Industry Canada label identifies certified equipment This certification means that the equipment meets certain telecommunications network protective operational and safety requirements as prescribed in the appropri...

Page 5: ...the devices does not exceed 5 3 The standard connecting arrangement telephone jack type for this equipment is jack type s USOC RJ11C Copyright This user s guide is copyrighted by Toshiba Corporation with all rights reserved Under the copyright laws this user s guide cannot be reproduced in any form without the prior written permission of Toshiba No patent liability is assumed however with respect ...

Page 6: ...crepancies between the modem and the user s guide Trademarks Microsoft and Windows are registered trademarks of Microsoft Corporation Microcom and Microcom Networking Protocol are registered trademarks of Microcom Inc Hayes is a registered trademark of Hayes Microcomputer Products Inc MNP is a trademark of Microcom Systems Inc ...

Page 7: ...cing an outgoing voice call 22 Viewing Call History 25 Configuring Modem On Hold 25 Configuring Modem On Hold settings 26 Enabling Disabling the Modem On Hold autorun status 28 Adding and removing the Modem On Hold icon from the system tray 28 Locating the Modem On Hold application version 29 Chapter 2 Function Check 31 Running diagnostics 31 Determining current connection protocol 38 ...

Page 8: ... 49 Setting the data flow control 49 Facsimiles 50 Chapter 4 AT Commands 51 AT command formats 51 Escape sequence 52 A Repeat last command 52 A Answer command 52 Bn Communication standard setting 52 Dn Dial 53 En Echo command 54 Hn Hook control 55 In Request ID information 55 Ln Monitor speaker volume 60 Mn Monitor speaker mode 60 Nn Modulation handshake 61 On Return online to data mode 61 P Selec...

Page 9: ... Pulse Dial Make Break Ratio 68 Tn Self test commands 68 V View active configuration and stored profile 69 W Store current configuration 69 Y Select stored profile for hardware reset 69 Zn x Store telephone number 70 Nn Error control mode selection 70 Qn Local flow control selection 71 Vn Protocol result code 71 Cn Data compression control 72 V 90 n 72 DS44 V 44 Data Compression Command 73 MS Comm...

Page 10: ...MF dialing speed 85 S12 Escape guard time 86 S37 Dial line rate 86 AT command set result codes 87 Chapter 6 Test Function 92 Test description 92 Testing procedure 93 Chapter 7 MNP and V 42 95 Error correction overview 95 MNP error correction 95 V 42 error correction 96 Operation modes 96 Normal mode 96 Reliable mode 96 Commands Nn 97 Flow control 97 Serial port flow control 98 XON XOFF flow contro...

Page 11: ...ifications 101 Network control unit NCU 101 Communication specifications 102 Appendix B Communication Conditions 103 Communication parameters 103 Telephone line types 103 Connectable lines 2 wire 104 Unconnectable lines 4 wire 104 Dial modes 104 Glossary 105 Index 117 ...

Page 12: ...rmation on features operation and technical specifications of your internal modem Conventions This user s guide uses the following formats to describe identify and highlight terms and operating procedures Abbreviations On first appearance and whenever necessary for clarity abbreviations are enclosed in parentheses following their definition for example Read Only Memory ROM Acronyms are also define...

Page 13: ...re you to simultaneously use two or more keys We identify such operations by the key top symbols separated by a plus sign For example Ctrl C means you must hold down Ctrl and at the same time press C If three keys are used hold down the first two and at the same time press the third Display ATDT Text you are to type in is represented in the type face you see to the left ABC Text generated by the c...

Page 14: ...ernal modem provides capability for facsimile transmissions and standard computer to computer data communications at a rate of up to 53 000 bits per second downstream It supports the following V 92 features Fast Connect shortensconnectiontimes upto 25percent by storing phone line characteristics Modem On Hold MOH enables you to talk on the telephone while connected to the Internet using the same t...

Page 15: ...vary depending on line conditions Many users will experience throughput in the range of 32 to 44 kbps under normal conditions depending on telephone line quality To achieve a V 92 56K connection both your modem and the host modem typically at an ISP must be V 92 56K modems As many ISPs do not yet support the V 92 protocol most connections will be V 90 56K connections V 92 connections also require ...

Page 16: ... transmit and receive facsimiles at rates of up to 14 400 bps The internal modem supports Class 1 fax transmission Standard com mands The internal modem is compatible with the industry standard Hayes AT commands and S Register settings Error control This feature assures accurate data transmis sion even over telephone lines subject to noise interference The internal modem uses Microcom Networking P...

Page 17: ... Refer to your computer s documentation for details on Standby Hibernate modes Modem On Hold Enables you to talk on the telephone while con nected to the Internet using the same telephone line This feature requires ISP support and Call Waiting Caller IDService The phone line must support Type 2 Caller ID CID Fast Connect Shortens connection times up to 25 percent by storing phone line characterist...

Page 18: ... 1200 bps V 21 300 bps BELL212A 1200 bps BELL103 300 bps MNP5 Data compression MNP4 Error control V 44 Data compression V 42bis Data compression V 42 Error control Fax V 17 7200 9600 bps 12 14 4 Kbps V 29 7200 9600 bps V 27ter 2400 4800 bps V 21 ch2 300 bps EIA 578 Class 1 command set for fax Functions available in all operating systems Continued Function Remarks ...

Page 19: ...V 92 modem protocol You must also have Caller ID service if you want the application to display the identity of incoming calls The phone line must support Type 2 Caller ID For V 90 connections which do not support the Modem On Hold feature the Modem On Hold application displays the incoming call information so that you can choose to either ignore it or disconnect the Internet connection to answer ...

Page 20: ...ed or you place an outgoing voice call while connected to the Internet This dialog displays information about the call in a Call Status box Answering an incoming voice call When the modem detects an incoming voice call during an Internet connection the V 92 Modem on Hold dialog appears The Call Status box indicates that a call is waiting If you have Caller ID the dialog also displays the phone num...

Page 21: ...rnet connection you must complete the voice call before the Modem On Hold timer expires The application displays the timer in the lower right corner The timeout value is determined by your ISP 4 To end your voice call and resume your Internet connection click Resume Data Call A dialog displays indicating that the Modem On Hold has been cancelled and instructing you to hang up Sample Modem On Hold ...

Page 22: ...OTE A Call Canceled message may display If this occurs wait a few seconds while the modem automatically redials and reestablishes your Internet connection Placing an outgoing voice call To use this function your phone line must support three way calling service 1 Right click the icon located on the system tray to display the modem popup window Sample modem popup window 2 Click Place Voice Call ...

Page 23: ...gnore to cancel the call The Call Status box indicates that the Internet connection is on hold while you complete your voice call Sample Modem On Hold in progress dialog box 4 Pick up your telephone handset and place your voice call 5 To maintain the Internet connection you must complete the voice call before the Modem On Hold timer expires The application displays the timer in the lower right cor...

Page 24: ... If this occurs wait a few seconds while the modem automatically redials and reestablishes your Internet connection A dialog displays indicating that the Modem On Hold has been cancelled and instructing you to hang up Sample Modem On Hold cancelled dialog box 7 Click OK The Call Status box indicates that it is resuming the modem connection Sample Resuming modem connection dialog box The modem conn...

Page 25: ...con located on the system tray to display the modem popup window Sample modem popup window 2 Click Call History to display the Call History log Sample Call History log Configuring Modem On Hold The Modem On Hold application comes preconfigured with Call Waiting Caller ID and the Modem On Hold Feature enabled If your configuration does not match this you can change the default configuration You can...

Page 26: ...r of your desktop The V 92 MoH Settings dialog appears Sample V 92 MoH Settings dialog box 2 If you do not have Call Waiting service clear the Enable Call Waiting check box All of the other settings in this dialog become unavailable If you do not have Call Waiting the modem will still display a message when it detects an incoming call during an Internet connection however you will not be able to u...

Page 27: ...em On Hold timer expires disconnecting an incoming or outgoing voice call if not completed clear the Warn before timeout check box 6 To change the Modem On Hold warning timer value select a value from the Warn before timeout dropdown box You can set the timer from 10 to 60 seconds in intervals of 10 seconds 7 If your phone system requires a number to be dialed to switch between voice and data call...

Page 28: ...m On Hold application no longer launches automatically when you start your computer 3 If Start Automatically is not checked you can click it to select this option A check mark appears next to the option The Modem On Hold application now launches automatically when you start your computer Adding and removing the Modem On Hold icon from the system tray If you no longer wish to use the Modem On Hold ...

Page 29: ...dem popup window 2 Click Exit MOH A confirmation dialog appears 3 Click OK to remove the icon from the system tray Adding the icon From your desktop click Start Programs Toshiba Internal Modem Modem on Hold The icon is added to the system tray Locating the Modem On Hold application version 1 Right click the icon located on the system tray to display the modem popup window Sample modem popup window...

Page 30: ...30 Modem On Hold Locating the Modem On Hold application version 5 375 x 8 375 ver 2 4 0 2 Click About MOH to display the application version Sample About MOH ...

Page 31: ...lem and in many cases the solution Running diagnostics If the modem is not working properly running some simple diagnostics can help you determine if the modem drivers are installed correctly or if the modem is not working due to a conflict with another application using the communications port To run modem diagnostics 1 Double click Control Panel on your computer s desktop to open the Control Pan...

Page 32: ...32 Function Check Running diagnostics 5 375 x 8 375 ver 2 4 0 Sample Control Panel 2 Double click Phone and Modem Options to open the Phone and Modem Options window ...

Page 33: ...33 Function Check Running diagnostics 5 375 x 8 375 ver 2 4 0 Sample Phone and Modem Options window 3 Click the Modems tab to display the installed modems ...

Page 34: ...Check Running diagnostics 5 375 x 8 375 ver 2 4 0 Sample Modems tab dialog box 4 If it is not already selected click Toshiba Software Modem then click Properties to open the Toshiba Software Modem Properties window ...

Page 35: ...35 Function Check Running diagnostics 5 375 x 8 375 ver 2 4 0 Sample Toshiba Software Modem Properties window 5 Click the Diagnostics tab ...

Page 36: ...em executes an automatic operations test displaying the following message while the test is in progress Sample Diagnostics test in progress message If the diagnostic test runs successfully a series of commands and the modem s response displays in the Modem Information box The modem drivers are installed correctly ...

Page 37: ...ot properly installed 7 If the diagnostic test fails and this is the first time you ve run the test restart the computer and repeat step 1 through step 6 8 If the diagnostic test fails a second time double click Control Panel on your computer s desktop to open the Control Panel 9 Double click Add Remove Programs to open the Add Remove programs window 10 Select and remove the Toshiba Software Modem...

Page 38: ...commands and the modem s response appear in the Modem Information box Use the scroll bar if necessary to locate the ATI3 command and its response 14 Verify that the driver you installed in step 12 is the currently installed driver Determining current connection protocol If V 92 features do not appear to be functioning verify that the connection is a V 92 connection using the following procedure 1 ...

Page 39: ...39 Function Check Determining current connection protocol 5 375 x 8 375 ver 2 4 0 Sample Control Panel 2 Double click Phone and Modem Options to open the Phone and Modem Options window ...

Page 40: ...40 Function Check Determining current connection protocol 5 375 x 8 375 ver 2 4 0 Sample Phone and Modem Options window 3 Click the Modems tab to display the installed modems ...

Page 41: ... Determining current connection protocol 5 375 x 8 375 ver 2 4 0 Sample Modems tab 4 If it is not already selected click Toshiba Software Modem then click Properties to open the Toshiba Software Modem Properties window ...

Page 42: ...42 Function Check Determining current connection protocol 5 375 x 8 375 ver 2 4 0 Sample Toshiba Software Modem Properties window 5 Click the Diagnostics tab ...

Page 43: ...iew log to display connection information about the last call 7 Locate the data compression format in the log If it lists V 44 data compression the connection was a V 92 connection 8 To append connection information for future calls to the existing call log on the Diagnostics tab select the Append to Log check box ...

Page 44: ... connect the internal modem to and disconnect it from a telephone jack CAUTION The modem is designed for use with a standard analog telephone line Do not connect the modem to a digital telephone line A digital line may damage the modem If you connect the modem to a digital telephone line the modem will not dial and will display the message NO DIAL TONE at the AT command line ...

Page 45: ... is analog Telephones in an office environment are commonly connected to digital phone lines Unfortunately the wall jacks for both analog and digital phone lines use the familiar RJ11 connector as shown on page 46 If you are not sure that an RJ11 jack terminates an analog phone line do not connect the modem to it Connecting the internal modem CAUTION In the event of a lightning storm unplug the mo...

Page 46: ...sert it until you hear a click Disconnecting the internal modem When you need to disconnect the internal modem s modular cable 1 Pinch the connecting lever on the connector in the telephone wall jack and pull out the connector Disconnecting the cable from the wall jack 2 Disconnect the modular cable from the computer s modem port Squeeze here ...

Page 47: ... commands directly into the communication software program You must be in terminal mode to enter the AT commands Refer to your software documentation or online help Connecting to a telephone line The AT commands for connecting to a telephone line depend on whether you are using a direct line or an extension line such as in an office building Direct access line To place a call using tone dialing en...

Page 48: ...ks indicate the number you are calling To place a call using pulse dialing enter ATDP 9 and press Enter The nine or other number is for line access the comma is for a pause about 2 seconds with the default setting to give time for a connection The asterisks indicate the number you are calling You can enter as many commas as you need The following example will result in a six second pause ATDT 9 an...

Page 49: ...n If the internal modem is dialing or has not yet gone online you can terminate a call by pressing any key If the terminal is online enter the escape code then type ATH and press Enter If the remote party disconnects the call will be automatically cut off If the power to the computer is cut off the call is terminated Setting the data flow control Data flow control is used to start and stop data tr...

Page 50: ...rol This control method is managed by software The start stop signals that is transfer on transfer off are included in the data stream To set XON XOFF control enter the following AT command AT Q1 Please use any settings recommended in your communications software manual Facsimiles Fax communication uses EIA 578 Class 1 commands and requires fax software Communication is controlled by the fax softw...

Page 51: ...ats The format for entering AT commands is ATXn where X is the AT command and n is the specific value for some of the commands After you type in the command press Enter Any command issued is acknowledged with a response in either text or numeric values known as result codes All commands and command values accepted by the modem are described in this section any entry other than those listed results...

Page 52: ... Guard Time S12 The pause prevents the modem from interpreting the escape sequence as data The value of the escape sequence character may be changed using register S2 A Repeat last command This command repeats the last command string entered Do not precede this command with an AT prefix nor conclude it by pressing Enter A Answer command This command instructs the modem to go off hook and answer an...

Page 53: ...modifiers easier to read The following may be used as phone number modifiers B1 Selects Bell 212A when the modem is at 1200 bps B2 Unselects V 23 reverse channel B3 Unselects V 23 reverse channel B15 Selects V 21 when the modem is at 300 bps B16 Selects Bell 103J when the modem is at 300 bps OK n 0 1 2 3 15 16 ERROR Otherwise P Pulse dialing S n Dial using the string saved by Zn command T Touch to...

Page 54: ...ialing the number If silence is not detected the modem sends a NO ANSWER result code back to the caller Hook flash Causes the modem to go on hook for 0 5 seconds and then return to off hook Return to command mode Causes the modem to return to command mode after dialing a number without disconnecting the call L Redials last number Should be the first character following ATD ignored otherwise Bong t...

Page 55: ... Modem goes on hook default H1 Modem goes off hook OK n 0 1 ERROR Otherwise I0 or I3 Returns the modem identity string and driver version number I1 Returns OK no function I2 Returns OK no function I4 Returns the driver build date I5 Returns the driver version bus type PCI AC97 codec type and country I6 Returns OK no function I7 Returns the hardware version I8 Returns the codec type I9 Returns the ...

Page 56: ...rotocol Negotiation Result LAPM Data Compression Result V 44 Estimated Noise Level 199 Receive Signal Power Level dBm 26 Transmit Signal Power Level dBm 13 Round Trip Delay msec 0 Near Echo Level dBm 13 Far Echo level dBm 73 Transmit Frame Count 0 Transmit Frame Error Count 0 Receive Frame Count 0 Receive Frame Error Count 0 Retrain by Local Modem 0 Retrain by Remote Modem 0 Rate Renegotiation by ...

Page 57: ...mit Carrier Rate Initial upstream rate Initial Receive Carrier Rate Initial downstream rate Final Transmit Carrier Rate Current or final upstream rate Final Receive Carrier rate Current or final downstream rate Protocol Negotiation Result LAPM MNP or NONE depending on V 42 negotiation DataCompression Result V 44 V 42bis MNP5 or NONE Estimated Signal Noise Level Signal to noise ratio with implied n...

Page 58: ...or Count The number of REJ frames received at the analog client modem Receive Frame Count The number of LAPM frames received by the client modem during this call The count wraps around at 65 535 Receive Frame Error Count Number of frames received in error by the client modem Retrain by Local Modem Number of retrains requested by the client modem Retrain by Remote Modem Number of retrains requested...

Page 59: ...al 2 no answer busy etc 3 training failure V 90 or V 34 4 protocol failure for example if required by N4 Robbed Bit Signaling For PCM connection only a hexadecimal 6 bit pattern of T1 frames with robbed bit signaling Digital Loss dB For PCM connection only the downstream digital loss Remote Server ID NA Connection Time sec The time between the remote answer and the connect result in seconds As des...

Page 60: ...urns the speaker on or off Result Codes L0 Low volume L1 Low volume Same as L0 L2 Medium volume default L3 High volume OK n 0 1 2 3 ERROR Otherwise M0 The speaker is off M1 The speaker is on until the modem detects the carrier signal default M2 The speaker is always on when modem is off hook M3 The speaker is on until the carrier is detected except when dialing OK n 0 1 2 3 ERROR Otherwise ...

Page 61: ...handshake only at the communication standard specified by S37 and the ATB command N1 When originating or answering begin the handshake at the communication standard specified by S37 and the ATB command default During handshake a lower transmission speed may be selected OK n 0 1 ERROR Otherwise O0 Instructs the modem to exit online command mode and return to data mode see AT escape sequence O1 This...

Page 62: ...ws the user to turn result codes on or off Result Codes T Select tone dialing This command instructs the modem to send DTMF tones while dialing Dialed digits are tone dialed until a P command or dial modifier is received This is the default setting Vn DCE response format This command controls whether result codes including call progress and negotiation progress messages are displayed as words or t...

Page 63: ...ult codes OK n 0 1 ERROR Otherwise W0 CONNECT result code reports DTE speed Disable protocol result codes W1 CONNECT result code reports DTE speed Enable protocol result codes W2 CONNECT result code reports DCE speed Enable protocol result codes default OK n 0 1 2 ERROR Otherwise Command Extended Result code Dial tone Detect Busy signal Detect X0 Disable Disable Disable X1 Enable Disable Disable X...

Page 64: ...ion of the modem s error correction and data compression operation Disabled The modem dials a call regardless of whether it detects a dial tone Enabled The modem dials only upon detection of a dial tone and disconnects the call if the dial tone is not detected within the specified time The period of time the modem waits before dialing is specified in register S6 Disabled The modem ignores any busy...

Page 65: ... Detect is a signal from the modem to the computer indicating that a carrier signal is being received from a remote modem DCD normally turns off when the modem no longer detects the carrier signal Result Codes Z0 Reset and restore stored profile 0 Z1 Reset and restore stored profile 1 OK n 0 1 ERROR Otherwise C0 The state of the carrier from the remote modem is ignored DCD circuit is always on C1 ...

Page 66: ...ettings in the active configuration with factory values D0 Ignore The modem ignores the true status of DTR and treats it as always on This should only be used if your communication software does not provide DTR to the modem D1 If the DTR signal is not detected while in online data mode the modem enters command mode issues an OK result code and remains connected D2 If the DTR signal is not detected...

Page 67: ... only used in V 22 and V 22bis mode This option is not used from North America and is for international use only Result Codes Kn Local flow control selection Result Codes G0 Guard tone disabled default G1 Sets guard tone to 550 Hz G2 Sets guard tone to 1800 Hz OK n 0 1 2 ERROR Otherwise K0 Disables flow control K3 Enables RTS CTS flow control default K4 Enables XON XOFF flow control OK n 0 3 4 ERR...

Page 68: ...ake break ratio at 10 pulses per second P1 Selects 33 67 make break ratio at 10 pulses per second P2 Selects 33 67 make break ratio at 20 pulses per second OK n 0 to 2 ERROR Otherwise T0 Abort Stops any test in progress T1 Local analog loopback test V 56 Loop 3 This test verifies modem operation as well as the connection between the modem and computer If the modem is online when this command is is...

Page 69: ...ses a list of storable parameters which you can view using the V command These settings are restored to the active configuration upon receiving a Zn command or at power up Refer to V View active configuration and stored profile on page 69 Result Codes Y Select stored profile for hardware reset This command does not change the modem behavior but is included for compatibility with applications that ...

Page 70: ...odem when sending or receiving data OK n 0 1 2 3 ERROR Otherwise N0 Buffer mode No error control Also known as Normal Mode N1 Direct mode N2 MNP or disconnect mode The modem attempts to connect using MNP2 4 error control procedures If this fails the modem disconnects This is also known as MNP reliable mode N3 V 42 MNP or buffer default The modem attempts to connect in V 42 error control mode If th...

Page 71: ...code Result Codes N7 V 42 MNP or Buffer same as N3 OK n 0 1 2 3 4 5 7 ERROR Otherwise Q0 Disable flow control Q1 XON XOFF software flow control Q3 RTS CTS to DTE default OK n 0 1 3 ERROR Otherwise V0 Disable protocol result code appended to DCE speed V1 Enable protocol result code appended to DCE speed default OK n 0 1 ERROR Otherwise ...

Page 72: ... command enables disables V 90 and changes the downstream rate Possible values of n C0 V 42bis MNP 5 disabled No data compression C1 V 42bis MNP 5 enabled Data compression enabled default OK n 0 1 ERROR Otherwise V90 0 Disables V 90 V90 1 Enables V 90 Auto rate default value V90 X Controls the downstream rate V90 Shows the current value V90 Shows the range 0 21 AT V90 X Downstream Rate 0 V 90 disa...

Page 73: ...y the current data compression configuration and the supported direction parameter values DS44 direction Valid direction values are as follows 5 32000 bps 6 33333 bps 7 34666 bps 8 36000 bps 9 37333 bps 10 38666 bps 11 40000 bps 12 41333 bps 13 42666 bps 14 44000 bps 15 45333 bps 16 46666 bps 17 48000 bps 18 49333 bps 19 50666 bps 20 52000 bps 21 53333 bps 0 Modem does not negotiate V 44 compressi...

Page 74: ... having to change multiple S registers this single command produces the same effect The command can also be used to display the current modem protocol and maximum connection speed settings In addition it can be used to display all the supported MS command parameter values MS carrier automode min_rate max_rate 1 Modem negotiates V 44 compression for transmit only 2 Modem negotiates V 44 compression...

Page 75: ... 90 V34 V 34 V32T V 32ter V32B V 32bis V32 V 32 V22B V 22bis V22 V 22 Bell212A Bell 212A V23C V 23 constant carrier asymmetric FDM V21 V 21 Bell103 Bell 103 automode 0 Disables automatic modulation negotiation 1 Enables automatic modulation negotiation default If a max_rate value is specified automode is automatically disabled min_rate The minimum receive rate Valid min_rate values are from 300 to...

Page 76: ...ll supported values for each MS command parameter max_rate The maximum receive rate If set to 0 then the max rate will be determined by the modulation means selected in the carrier and automode settings Zero is the default Valid max_rate values are from 300 to 57333 Maximum receive rates for each valid carrier are as follows in bits per second V92 28000 57333 steps of 1333 V90 28000 57333 steps of...

Page 77: ...ng parameter values PCW call waiting Valid call waiting parameter values are as follows Result Codes PCW This command displays the current call waiting configuration PCW This command displays the supported call_waiting parameter values 0 Enables the call waiting detector When a call waiting signal is detected the modem responds to it according to the VCID caller ID command configuration This is th...

Page 78: ...upstream configuration and to display the supported PIG command parameter values PIG value Valid value parameter values are as follows Result Codes PIG This command displays the current PIG command configuration PIG This command displays the supported PIG value parameter values 0 Enables PCM upstream 1 Disables PCM upstream This is the default OK value 0 1 ERROR Otherwise ...

Page 79: ... Valid value parameter values are as follows Result Codes PMH This command displays the current PMH command configuration PMH This command displays the supported PMH value parameter values VCID Command This command enables or disables caller ID You can also use this command to display the current caller ID configuration and to display the supported VCID command parameter values 0 Enables Modem On ...

Page 80: ...llows Result Codes VCID This command displays the current caller ID configuration VCID This command displays the supported VCID value parameter values 0 Disables caller ID This is the default 1 Enables caller ID with formatted presentation 2 Enables caller ID without formatting OK value 0 1 2 ERROR Otherwise ...

Page 81: ...ection fails You can also customize certain AT commands such as the escape sequence and command line termination The contents of the registers are changed automatically when you modify corresponding settings in your communication software If you choose however you can display and edit the contents of the registers manually when the modem is in command mode If the value is outside the acceptable ra...

Page 82: ...type in the register number and its new value press Enter S0 Auto answer ring number This register determines the number of rings the modem will count before automatically answering a call Enter 0 zero if you do not want the modem to automatically answer at all When disabled the modem can only answer with an ATA command S1 Ring counter This register is read only The value of S1 is incremented with...

Page 83: ...nd line termination character user defined This register determines the ASCII values as the carriage return character This character is used to end command lines and result codes S4 Response formatting character user defined This register determines the ASCII value used as the line feed character The modem uses a line feed character in command mode when it responds to the computer Range 0 255 Defa...

Page 84: ...n ASCII space character and a second backspace character This means a total of three characters are transmitted each time the modem processes the backspace character S6 Wait before dialing This register sets the length of time in seconds that the modem must wait pause after going off hook before dialing the first digit of the telephone number The modem always pauses for a minimum of two seconds ev...

Page 85: ... is reset upon detection of an answer tone if allowed by county restriction The timer also specifies the wait for silence time for the dial modifier in seconds S7 is not associated with the W dial modifier S8 Comma pause time This register sets the time in seconds that the modem must pause when it encounters a comma in the dial command string S11 DTMF dialing speed This register determines the dia...

Page 86: ...7 Dial line rate Range 0 255 Default 50 Units 02 seconds S37 0 default maximum modem speed S37 1 reserved S37 2 1200 75 bps S37 3 300 bps S37 4 reserved S37 5 1200 bps S37 6 2400 bps S37 7 4800 bps S37 8 7200 bps S37 9 9600 bps S37 10 12000 bps S37 11 14400 bps S37 12 16800 bps S37 13 19200 bps S37 14 21600 bps S37 15 24000 bps S37 16 26400 bps S37 17 28800 bps S37 18 31200 bps S37 19 33600 bps ...

Page 87: ...NNECT 1200 EC 5 Connection at 1200 bps NO DIAL TONE 6 No dial tone detected BUSY 7 Busy signal detected CONNECT 2400 EC 10 Connection at 2400 bps CONNECT 4800 EC 11 Connection at 4800 bps EC appears only when the Extended Result Codes configuration option is enabled EC is replaced by one of the following symbols depending upon the error control method used V 44 V 44 data compression with V 42 erro...

Page 88: ...s CONNECT 28800 EC 58 Connection at 28800 bps CONNECT 31200 EC 59 Connection at 31200 bps CONNECT 33600 EC 60 Connection at 33600 bps CONNECT 38400 EC 28 Connection at 38400 bps DTE rate Command Set Result Codes Table Continued Result Code Numeric Description EC appears only when the Extended Result Codes configuration option is enabled EC is replaced by one of the following symbols depending upon...

Page 89: ...ection at 46000 bps CONNECT 48000 EC 78 Connection at 48000 bps CONNECT 50000 EC 79 Connection at 50000 bps CONNECT 52000 EC 80 Connection at 52000 bps CONNECT 54000 EC 81 Connection at 54000 bps Command Set Result Codes Table Continued Result Code Numeric Description EC appears only when the Extended Result Codes configuration option is enabled EC is replaced by one of the following symbols depen...

Page 90: ...333 EC 109 Connection at 45333 bps CONNECT 46666 EC 110 Connection at 46666 bps CONNECT 49333 EC 111 Connection at 49333 bps CONNECT 50666 EC 112 Connection at 50666 bps CONNECT 53333 EC 113 Connection at 53333 bps Command Set Result Codes Table Continued Result Code Numeric Description EC appears only when the Extended Result Codes configuration option is enabled EC is replaced by one of the foll...

Page 91: ...xtended Result Codes configuration option is enabled EC is replaced by one of the following symbols depending upon the error control method used V 44 V 44 data compression with V 42 error control V 42bis V 42 error control and V 42bis data compression V 42 V 42 error control only MNP 5 MNP class 4 error control and MNP class 5 data compression MNP 4 MNP class 4 error control only NoEC No error con...

Page 92: ... a local analog loopback test function that identifies the cause of a malfunction You can use the test to check errors in data communications or to check operation following modem connection When conducting a test use the T command to select test mode and control For details on the T command refer to Tn Self test commands on page 68 In this test data is transmitted from the computer is looped back...

Page 93: ...llowing AT commands to set the modem to normal mode AT F N0 Receive OK 2 Enter the following AT commands to select the local analog loopback test AT T1 You are now in the online state 3 Enter characters from the keyboard as desired The characters you enter should be displayed on the screen Computer Modem Transmitter Receiver Transmission Reception ...

Page 94: ...on Testing procedure 5 375 x 8 375 ver 2 4 0 4 Enter the escape code as follows to return to the command state from the online state Receive OK 5 Enter the following AT commands to terminate the test AT T0 Receive OK ...

Page 95: ...ce can cause errors in data communication Noise is especially a problem at high speeds of 14 400 bps or greater The MNP and V 42 protocols were developed to ensure reliable data communications despite the high probability of error generation from line noise MNP error correction MNP was developed by Microcom MNP class 4 enables data correction of full duplex communications and also provides asynchr...

Page 96: ...dem and MNP classes 2 3 and 4 This protocol first tries to establish a link to the remote modem with LAP M If it is unsuccessful it tries to connect with MNP Although this modem uses class 4 correction it can connect in class 5 to remote modems that support class 5 Operation modes The operation mode depends on whether an error correction protocol is being used Normal mode Errors are not corrected ...

Page 97: ...s a speed difference between the serial port and modem port the buffers in the modem will become full periodically Therefore the communication activity is controlled so that data transmission or reception is temporarily halted before the data exceeds buffer capacity and transmission is resumed when the receiving buffers have room This is the flow control function The modem card has two kinds of fl...

Page 98: ...s have room to receive data again the transmission halt request is canceled and data transmission from the personal computer is resumed The internal modem provides three kinds of serial port flow control one determined by software and two determined by hardware XON XOFF flow control software Flow control is performed by sending XON and XOFF control codes in the data stream The XOFF code makes a tr...

Page 99: ...transmission halt or restart request is made from the modem to the computer using the CTS signal A transmission halt or restart request is made from the personal computer to the modem using the RTS signal Commands Qn Kn Select flow control between the modem and computer serial port as follows When CTS RTS flow control is supported by the communication software Q3 K3 Communication in reliable mode ...

Page 100: ...ta received from the computer The receiving modem decompresses the received data and sends it to its own computer This data compression function increases actual transmission speed up to twofold in communications using MNP5 or up to three or fourfold in communications using V 42bis The compression ratio varies depending on the data Actual speed will not always be raised close to the maximum compre...

Page 101: ... appendix summarizes the Toshiba internal modem s technical specifications Network control unit NCU Type of NCU AA Type of line General telephone line Type of dialing Pulse Tone Control command AT commands EIA 578 commands Monitor function Computer s speaker ...

Page 102: ... ITU T Rec V 21 V 22 V 22bis V 32 V 32bis V 34 56K V 90 V 92 Bell 103 212A Fax ITU T Rec V 17 V 29 V 27ter Former CCITT V 21 ch2 Communication speed Data 300 1200 2400 4800 7200 9600 12000 14400 16800 19200 21600 24000 26400 28800 29333 30666 33333 34666 37333 38666 41333 42666 45333 46666 49333 50666 53333 54666 bps Fax 2400 4800 7200 9600 12000 14400 bps Transmitting level 10 dBm ...

Page 103: ...ication parameters from the table below Telephone line types This internal modem can be connected to 2 wire analog subscriber telephone lines POTS lines only Start bit Data length bit Parity bit Stop bit 1 8 None 1 or more 1 7 0 1 or more 1 7 1 1 or more 1 7 Odd 1 or more 1 7 Even 1 or more 1 7 None 2 ...

Page 104: ...dem Lines that require pressing the Line button for example 0 before dialing Dial modes There are two types of dial modes pulse dial and tone dial Generally pulse dial lines are associated with rotary phones but there may be cases where a push button phone is connected to a pulse dial line so it is not possible to identify the type of line simply by looking at the phone If you are not sure what ty...

Page 105: ...unications Port 2 serial port CPU Central Processing Unit FCC Federal Communications Commission FTP File Transfer Protocol GND Ground HDD Hard Disk Drive HTML HyperText Markup Language I O Input Output IRQ Interrupt Request ISA Industry Standard Architecture KB Kilobyte LAN Local Area Network LBA Logical Block Addressing ...

Page 106: ... Universal Serial Bus VCR Video Cassette Recorder VESA Video Electronics Standards Association WSS Windows Sound System WWW World Wide Web A Auto reliable mode This mode connects to a remote station by MNP or V 42 if the remote modem accepts either of these protocols Otherwise it connects in normal mode address A number that identifies a location in the computer s memory or on disk It tells the co...

Page 107: ... a transmitted character begins and ends it is preceded by a start bit and followed by an optional parity bit and one or two stop bits See also synchronous B baud baud rate The speed at which communications devices such as printers terminals and modems transmit information Information travels as a series of electronic signals The baud rate measures the rate of change in these signals This is not n...

Page 108: ... to another See also local bus busy A code indicating the number called is busy byte A sequence of eight bits A byte is the smallest addressable unit of data Each byte represents an integer up to 255 in decimal 11111111 in binary or FF in hexadecimal or a character such as a letter numeral or other symbol See also binary bit gigabyte hexadecimal kilobyte megabyte C carrier A modem converts the dig...

Page 109: ...eyboard or pointing device or combine them into macros or programs Command state A state in which data from the personal computer is received as commands to control the internal modem Data from the personal computer will not be output to the telephone line Compression The translation of data video audio digital or a combination to a more compact form for storage or transmission In computer terms f...

Page 110: ...ther the modem is receiving the carrier from the opposite station DTE Data Terminating Equipment A communications device that is the source or destination of signals on a network It is typically a terminal or computer dial tone The tone that is heard from the handset when it is picked up dial mode Dial mode covers pulse dial and tone dial Pulse dial means turning the dial or pressing the buttons t...

Page 111: ...mission of data in which errors were found Error control Detection of errors in data communication Requests retransmission of data in which errors were found escape 1 To cancel the task currently in progress 2 A code ASCII code 27 generated by the Esc key telling the computer that what follows are commands not data Used with peripheral devices such as printers and modems Escape control This code i...

Page 112: ...ions simultaneously See also half duplex G gigabyte GB A unit of data storage equal to 1 073 741 824 bytes 1024 x 1024 x 1024 bytes See also byte Guard time An interval before and after an escape sequence that prevents the modem from interpreting the escape sequence as data H half duplex A type of data transmission in which data flows between two devices in one direction at a time See also full du...

Page 113: ... character printed on the key to the processor kilobyte KB A unit of data storage equal to 1024 bytes Its abbreviations K and KB are taken from the Greek word kilo meaning 1000 although the abbreviation refers to 1024 or 2 raised to the 10th power See also byte M megabyte MB A unit of data storage equal to 1024 KB From the Greek work mega for million one megabyte is actually 1 048 576 bytes 1024 x...

Page 114: ... information that was sent It consists of adding an error detection bit to a group of data bits making the sum of the bits either odd or even When you re using a modem to connect to another computer you can set parity to none odd or even In general you should set parity to none unless you re requested to do otherwise Private Branch Exchange PBX An automatic digital telephone switching system that ...

Page 115: ...ard defining control data and status signals for cables allowing asynchronous communication with computers printers and other peripheral devices S serial The handling of data bits one after the other serial communications A communications technique that uses as few as two interconnecting wires to send bits one after another serial interface An interface between systems or system components in whic...

Page 116: ...ialing method that uses tones instead of pulses to generate a telephone number Generally associated with push button phones although some push button phones can be connected to pulse lines U upload To send a file to another computer through a modem See also download UART Universal Asynchronous Receiver Transmitter is the circuit interface between the modem and computer It receives serial bit data ...

Page 117: ...isplay result codes 62 echo command 54 error control mode selection 70 escape sequence 52 extended result codes 64 format 51 guard tone control 67 hook control 55 load factory settings 66 local flow control selection 67 71 Modem On Hold 79 monitor speaker mode 60 monitor speaker volume 60 MS command 74 N modulation handshake 61 PCM Upstream 78 protocol result code 71 repeat last command string 52 ...

Page 118: ...rted 17 specifications 101 telephone line types 103 configuring Modem On Hold 25 connecting internal modem 44 45 connecting to a telephone line 47 connection procedures 44 CTS RTS 50 D data carrier detect 65 data compression 100 data compression control 72 data terminal ready DTR 66 default settings 31 diagnostics 31 dial a telephone number 53 dial tone detect 64 disconnecting the internal modem 4...

Page 119: ...n 28 placing a call 22 timer 21 using 20 version 29 viewing call history 25 MS command 74 N N modulation handshake 61 O operation modes 96 normal 96 reliable 96 P PCM Upstream 14 78 placing a call 22 protocol result code 71 protocols MNP 95 V 42 96 R receiving a call 49 repeat last command string 52 request ID information 55 Request To Send 50 result code control 62 result code option 63 result co...

Page 120: ...er 83 Wait before dialing 84 store current configuration 69 store telephone number 70 T telephone line connecting to 47 direct access line 47 extension line 48 terminating a call 49 test description 92 function 92 methods 92 test function loopback test 93 transfer on transfer off 50 V V 42 protocol 96 V 44 data compression 15 73 V 90 enable disable 72 V 92 connection requirements 15 features 14 ve...

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