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V.
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ii FCC Notice “Declaration of Conformity Information” This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, it may cause harmful interference to radio communications.
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iii Industry Canada Requirement This Class B digital apparatus complies with Canadian ICES-003. Cet appareil numérique de la classe B est conformé à la norme NMB-003 du Canada.
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iv If problems arise If any of your telephone equipment is not operating properly, you should immediately remove it from your telephone line, as it may cause harm to the telephone network. If the telephone company notes a problem, they may temporarily discontinue service. When practical, they will notify you in advance of this disconnection. If advance notice is not feasible, you will be notified as soon as possible.
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v The customer should be aware that compliance with the above conditions may not prevent degradation of service in some situations. Repairs to certified equipment should be coordinated by a representative designated by the supplier. Any repairs or alterations made by the user to this equipment, or equipment malfunctions, may give the telecommunications company cause to request the user to disconnect the equipment.
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vi Export Administration Regulation This document contains technical data that may be controlled under the U.S. Export Administration Regulations, and may be subject to the approval of the U.S. Department of Commerce prior to export. Any export, directly or indirectly, in contravention of the U.S. Export Administration Regulations is prohibited. Disclaimer This user’s guide has been validated and reviewed for accuracy.
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Contents V.90 56K Internal Modem User’s Guide.................................................................................. i Contents..................................................................................... vii Introduction................................................................................ xii Chapter 1: Setup .......................................................................... 1 Hardware Setup.......................................................................
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viii Direct access line ................................................................ 8 Extension line ...................................................................... 8 Receiving a call.................................................................... 9 Terminating a call................................................................ 9 Setting the data flow control............................................ 10 Facsimiles..........................................................................
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ix &Gn V.22bis guard tone control...................................... &Kn Local flow control selection.................................... &Pn Select Pulse Dial Make/Break Ratio ....................... &Tn Self-test commands................................................. &V View active configuration and stored profile............ &W Store current configuration...................................... &Zn=x Store telephone number...................................... \Nn Error control mode selection........
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x S38 K56flex Dial line rate.................................................. 45 S38 56K Downstream Rate............................................. 45 AT command set result codes ............................................. 46 Chapter 5: MNP and V.42......................................................... 52 Error-correction overview..................................................... 52 MNP error correction........................................................ 52 V.42 error correction.............
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Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii Function charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Introduction Congratulations on becoming the owner of a V.90 56K compliant internal modem offering advanced functions for fax and data communication. This user’s guide provides detailed information on features, operation and technical specifications of your internal modem. The V.90 56K internal modem provides capability for facsimile transmissions and standard computer-to-computer data communications. The internal modem has a modem port (RJ11) for connecting to an analog telephone line.
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xiii Some phone lines will not support V.90 56K connections at all, either because of quality impairments or additional digital-toanalog conversions (i.e., PBX systems). The modem uses the V.34 protocol for “upstream” data transmission, which supports connection rates of up to 33,600 bits/second. NOTE: 56K rates can be achieved only when one V.90 56K modem communicates with a V.90 56K host modem (i.e., a V.90 56K end-user client modem connects to a V.90 56K ISP-site modem).
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xiv Standard commands The internal modem is compatible with the industry standard Hayes® AT commands and S-Register settings. Error control This feature assures accurate data transmission even over telephone lines subject to noise interference. The internal modem uses Microcom Networking Protocol® 4 (MNP®4) and V.42 error correction. Data compression Compression can greatly increase data throughput. The internal modem has MNP5 and V.42bis data compression protocols.
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xv Function charts The chart below lists the internal modem’s supported communication protocols: Functions available in all operating systems Function Data Remarks V.90 From 32 Kbps to 56 Kbps V.34 From 2400 bps to 33.6 Kbps V.32bis Fax 4800, 7200, 9600 bps, 12, 14.4 Kbps V.32 4800, 9600 bps V.22bis 1200, 2400 bps V.22 1200 bps V.23 75, 600, 1200 bps V.21 300 bps BELL212A 1200 bps BELL103 300 bps MNP5 Data compression MNP4 Error control V.42bis Data compression V.
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xvi Functions available in all operating systems (Continued) Function Remarks V.29 7200, 9600 bps V.27ter 2400, 4800 bps V.21 ch2 300 bps EIA-578 Class 1 command set for fax Note: bps stands for bits per second User’s guide contents This user’s guide is composed of six chapters, plus an Introduction, two appendixes, a glossary, and an index. ❖ The Introduction describes the functions and capabilities of the internal modem.
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xvii ❖ Chapter 6, Test Function, describes how to conduct the loopback test. ❖ The Appendixes provide technical information. ❖ The Glossary defines telecommunications terminology. ❖ The Index quickly directs you to information contained in the user’s guide. Conventions This user’s guide uses the following formats to describe, identify, and highlight terms and operating procedures.
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xviii Text you are to type in is represented in the type face you see to the left. ATDT Display ABC Text generated by the computer that appears on its display screen is presented in the type face you see to the left (bold). Messages Messages are used in this user’s guide to bring important information to your attention. Each type of message is identified as shown below.
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Chapter 1 Hardware Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Function check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Setup This chapter describes how to set up your hardware and how to check the internal modem’s functions. It is written primarily for users who, for some reason, need to set up the modem again. Some procedures may vary slightly for users who have a preinstalled modem. Hardware Setup Use the MS-DOS® or TSETUP program to set the COM port, I/O address port, and IRQ level. Refer to your computer’s documentation.
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2 Setup Function check NOTE: HWSETUP in Windows does not enable changes to ports. Function check Use the Diagnostic function accessible in the Modems Properties window to check the functions of your internal modem. To run the diagnostics: 1 Click the Diagnostics tab in the Modems Properties window. Modem Properties window 2 Select the COM Port for Toshiba Internal V.90 Modem. (This is the COM port for the Toshiba internal modem.
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Setup Function check 3 3 Click More Info . . . . The system executes an automatic operations test. If the test does not run or if an error message appears, repeat the setup procedures. Diagnostics tab More Info...
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Chapter 2 Connection procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Basic operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Using the Internal Modem This chapter describes connection procedures and basic operations. Connection procedures This section describes how to 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 will damage the modem.
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6 Using the Internal Modem Connection procedures ❖ If a (working) telephone connected to the wall jack has an REN (Ringer Equivalency Number) printed on its label, then it is an analog phone. If the phone is working correctly, then the wall jack itself 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 below.
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Using the Internal Modem Basic operation 7 NOTE: When you connect the RJ11 jack, insert it until you hear a click. Disconnecting the internal modem When you need to disconnect the internal modem’s modular cable for transporting the computer or for some other reason: 1 Pinch the connecting lever on the connector in the telephone wall jack and pull out the connector. Squeeze here Disconnecting the cable from the wall jack 2 Disconnect the modular cable from the computer’s modem port.
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8 Using the Internal Modem Basic operation 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, enter: ATDT******* and press Enter. The asterisks * indicate the number you are calling. ❖ To place a call using pulse dialing, enter: ATDP******* and press Enter. The asterisks * indicate the number you are calling.
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Using the Internal Modem Basic operation 9 You can enter as many commas as you need. The following example will result in a six-second pause: ATDT 9, ******* and press Enter. NOTE: If you are using a PBX connection that does not wait for a dial tone, add the X0, X1 or X3 to the AT command line. For example: ATX3DP 9, ******* and press Enter. Actual usage will vary according to the host system, so please check with the system manager.
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10 Using the Internal Modem Basic operation Setting the data flow control Data flow control is used to start and stop data transmission according to the status of the data buffer (full or empty). The following describes how to set the data flow control method: ❖ CTS/RTS (hardware control) ❖ XON/XOFF (software) Also, see “MNP and V.42” on page 52. CTS/RTS control This control method is hardware-dependent.
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Using the Internal Modem Basic operation 11 Facsimiles Fax communication uses EIA-578 Class 1 commands and requires fax software. Communication is controlled by the fax software. NOTE: Use only software compatible with EIA-578 Class 1. Do not use EIA-592 Class 2-compatible software.
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Chapter 3 AT command formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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AT Commands In most cases, you will not need to type AT commands manually. However, there may be some occasions when you will need to do so. This chapter describes AT commands for data mode. Fax commands are taken care of by application software. AT command formats 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.
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14 AT Commands AT command formats +++ Escape sequence The escape sequence allows the modem to exit data mode and enter online command mode. While in online command mode, you can communicate directly with your modem using AT commands. When you finish, you can return to data mode using the ATO command. There must be a pause, the length of which is set by Escape Guard Time (S12), after you enter an escape sequence before any additional characters can be sent to the modem.
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AT Commands AT command formats 15 B0 Selects CCITT V.22 mode when the modem is at 1200 bps. 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. Result Codes: : OK n = 0,1,2,3,15,16 ERROR Otherwise Dn Dial This command instructs the modem to dial a telephone number.
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16 AT Commands AT command formats @ Wait for quiet answer. Wait for five seconds of silence after dialing 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.
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AT Commands AT command formats 17 Result Codes: OK n=0,1 ERROR Otherwise In Request ID information This command displays product information about the modem. I0 Returns modem identity string and driver version number, same as 13. I1 Calculates ROM checksum and displays it on the DTE. I2 Performs a ROM check and calculates and verifies the checksum displaying OK or ERROR. I3 Returns modem identity string and driver version number, same as I0 I4 Returns firmware version for data pump.
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18 AT Commands AT command formats 7 Data Compression Result V42bis 8 Estimated Noise Level 152 9 Receive Signal Power Level (-dBm) 25 10 Transmit Signal Power Level (-dBm) 16 11 Round Trip Delay (msec) 4 Press any key to continue: Esc to quit.
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AT Commands AT command formats 19 6 LAPM or MNP or None, depending on V.42 negotiation. 7 V42bis or MNP or None, depending on V.42 negotiation. 8 Mean-square error of received downstream signal. This is a dimensionless decimal number, only valid during a call. Higher numbers are worse. There’s no absolute threshold of good reception; it depends on the downstream data rate. The number varies during a call, so it can be useful to sample it a few times.
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20 AT Commands AT command formats 2 = No answer, busy, etc. 3 = Training failure V.90, 56K or V.34 4 = Protocol failure if required by \N4, for example. 21 For PCM connection only, a hexidecimal 6-bit pattern of T1 frames with robbed-bit signaling. 22 For PCM connection only, the downstream digital loss. Result Codes: As described n=0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11 ERROR Otherwise Ln Monitor speaker volume This command sets speaker volume to low, medium, or high.
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AT Commands AT command formats 21 M2 The speaker is always on when modem is off-hook. Result Codes: OK n=0,1,2 ERROR Otherwise Nn Modulation handshake This command controls whether or not the local modem performs a negotiated handshake at connection time with the remote modem when the communication speed of the two modems is different. N0 When originating or answering, this is for handshake only at the communication standard specified by S37 and the ATB command.
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22 AT Commands AT command formats O3 This command issues a rate renegotiation before returning to online data mode. Result Codes: OK n=0,1,3 ERROR Otherwise P Select pulse dialing This command configures the modem for pulse (non-touch-tone) dialing. Dialed digits are pulsed until a T command or dial modifier is received. Tone dial is the default setting. Qn Result code control Result codes are informational messages sent from the modem and displayed on your monitor.
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AT Commands AT command formats 23 Vn DCE response format This command controls whether result codes (including call progress and negotiation progress messages) are displayed as words or their numeric equivalents. V0 Displays result codes as digits. V1 Displays result codes as text (default). Result Codes: OK n=0,1 ERROR Otherwise Wn Result Code Option W0 CONNECT result code reports DTE speed. Disable protocol result codes. W1 CONNECT result code reports DTE speed. Enable protocol result codes.
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24 AT Commands AT command formats Command Extended Result code Dial tone Detect Busy signal Detect X0 Disable Disable Disable X1 Enable Disable Disable X2 Enable Enable Disable X3 Enable Disable Enable X4 (default) Enable Enable Enable X5 Enable Enable Enable X6 Enable Enable Enable X7 Disable Enable Enable Extended result codes Disabled: Displays only the basic result codes: OK, CONNECT, RING, NO CARRIER, and ERROR.
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AT Commands AT command formats Enabled: 25 The modem monitors for busy tones. Result Codes: OK n=0,1,2,3,4,5,6,7 ERROR Otherwise Zn Recall stored profile The modem performs a soft reset and restores (recalls) the configuration profile according to the parameter supplied. If no parameter is specified, zero is assumed. Either Z0 or Z1 restores the profile.
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26 AT Commands AT command formats &Dn Data Terminal Ready (DTR) control This command interprets how the modem responds to the state of the DTR signal and changes to the DTR signal. &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.
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AT Commands AT command formats 27 command is only used in V.22 and V.22bis mode. This option is not used from North America and is for international use only. &G0 Guard tone disabled (default). &G1 Sets guard tone to 550 Hz. &G2 Sets guard tone to 1800 Hz. Result Codes: OK n=0,1,2 ERROR Otherwise &Kn Local flow control selection &K0 Disables flow control. &K3 Enables RTS/CTS flow control (default). &K4 Enables XON/XOFF flow control.
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28 AT Commands AT command formats Result Codes: OK n=0 to 2 ERROR Otherwise &Tn Self-test commands These tests can help to isolate problems if you experience periodic data loss or random errors. &T0 Abort. Stops any test in progress. &T1 Local analog loop. This test verifies modem operation, as well as the connection between the modem and computer. Any data entered at the local DTE is modulated, then demodulated, and returned to the local DTE. To work properly, the modem must be offline.
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AT Commands AT command formats Option Selection AT Command Speaker Volume Medium L Speaker Control OnUntilCarr M Result Codes Enable Q Dialer Type Tone T/P Result Code Form Text V Extend Result Code Enable X Dial Tone Detect Enable X Busy Tone Detect Enable X LSD Action Standard RS232C &C DTR Action Ignore &D Press any key to continue; Esc to quit. Option Selection AT Command V.22b Guard Tone Disable &G Flow Control Hardware &K Error Control Mode V.
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30 AT Commands AT command formats Option Selection AT Command No Carrier Disc 2000 msec. S10 DTMF Dial Speed 95 msec. S11 Escape GuardTime 1000 msec. S12 Data Calling Tone Disabled S35 Line Rate 33600 S37 Press any key to continue; Esc to quit. Stored phone numbers &Z0= &Z1= &Z2= &Z3= OK &W Store current configuration Saves the current (active) configuration (profile), including SRegisters. The current configuration comprises a list of storable parameters illustrated in the &V command.
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AT Commands AT command formats 31 &Zn=x Store telephone number This command is used to store up to four dialing strings in the modem’s nonvolatile memory for later dialing. The format for the command is &Zn=“stored number” where n is the location 0-3 to which the number should be written. The dial string may contain up to 40 characters. The ATDS=n command dials using the string stored in location n.
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32 AT Commands AT command formats \N5 V.42. MNP or Buffer (same as \N3). \N7 V.42. MNP or Buffer (same as \N3). Result Codes: OK n = 0, 1, 2, 3,4,5,7 ERROR Otherwise Qn Local flow control selection \Q0 Disable flow control. \Q1 XON/XOFF software flow control. \Q3 RTS/CTS to DTE (default). Result Codes: OK n = 0, 1, 3 ERROR Otherwise \Vn Protocol result code \V0 Disable protocol result code appended to DCE speed. \V1 Enable protocol result code appended to DCE speed (default).
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AT Commands AT command formats 33 %Cn Data compression control This command determines the operation of V.42bis and MNP class 5 data compression. Online changes do not take effect until a disconnect occurs first. %C0 V.42bis/MNP 5 disabled. No data compression. %C1 V.42bis/MNP 5 enabled. Data compression enabled (default). Result Codes: OK n = 0, 1 ERROR Otherwise -V.90= This command enables/disables V.90 and changes the downstream rate. -V90=0 Disables V.90 -V90=1 Enables V.
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34 AT Commands AT command formats 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 +MS Command This command can be used to set protocol and connection speed parameters for the modem. Instead of having to change multiple S registers, this single command produces the same effect.
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AT Commands AT command formats 35 +MS= , , <0>, , <0>, This command is used to set the various parameters described below: A modem connect protocol string, such as V.90 or 56K 0 Disables automatic modulation negotiation 1 Enables automatic modulation negotiation The maximum transmit rate. If set to 0, then the max rate will be determined by the modulation means selected in the and settings.
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36 AT Commands AT command formats +MS:(V21,V22,V22B,V23,V32,V32B,V34,V90C,56K),(0,1), (0),(0,300-33600),(0),(0,300-56000) The valid values for carrier are: Value Meaning V90C or V90 V90 K56 K56flex V34 V34 V32 V32 V32B V32bis V22 V22 V22B V22bis V23 V23 V21 V21 The valid values for max_rate for the different carriers are: Value Meaning V90, K56, V34 2400-33600 in steps of 2400 V32bis 4800-19200 in steps of 2400 V32 4800-14400 in steps of 2400 V22bis 2400 V22 2200 V23 1200 V
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AT Commands AT command formats V32bis 4800-19200 in steps of 2400 V32 4800-14400 V22bis 2400 V22 2200 V23 1200 V21 300 37
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Chapter 4 S-Register values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 AT command set result codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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S-Registers S-Registers contain the settings that determine how several functions of the internal modem operate, such as choosing how many times to let the telephone ring before the modem answers and how long to wait before it hangs up if a connection 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.
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40 S-Registers S-Register values S-Register values ❖ The format for displaying the value of an S-Register is: ATSn? where n is the register number. After you type in the register press Enter. ❖ The format for modifying the value of an S-Register is: ATSn=r where n is the register number, and r is the new register value. After you type in the register number and its new value press Enter.
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S-Registers S-Register values 41 S2 AT escape character (user-defined) This register determines the ASCII value used for an escape sequence. The default is the + character. The escape sequence allows the modem to exit data mode and enter command mode when online. Values greater than 127 disable the escape sequence. Range: 0-255 Default: 43 Units: ASCII S3 Command line termination character (user-defined) This register determines the ASCII values as the carriage return character.
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42 S-Registers S-Register values recognize the backspace character if it is set to an ASCII value greater than 32. This character can be used to edit a command line. When the echo command is enabled, the modem echoes back to the local DTE the backspace character, an 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.
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S-Registers S-Register values Range: 1-255 Default: 50 Units: seconds 43 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. Range: 0-65 Default: 2 Units: seconds S10 Automatic disconnect delay This register sets the length of time, in tenths of a second, that the modem waits before hanging up after a loss of carrier.
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44 S-Registers S-Register values S11 DTMF dialing speed This register determines the dialing speed. Range: 50-150 Default: 95 Units: .001 seconds S12 Escape guard time This register sets the value (in 20 ms increments) for the required pause after the escape sequence (default 1 second). Range: 0-255 Default: 50 Units: .
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S-Registers S-Register values 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 45 S38 K56flex Dial line rate S38 enables and disables K56flex mode and sets the maximum K56flex downstream speed that the modem attempts to connect. S38=0 56K disabled (default) S38=1 56K enabled: automatic speed selection of maximum modem speed NOTE: Not all modems support K56flex.
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46 S-Registers AT command set result codes S38=3 34 kbps S38=4 36 kbps S38=5 38 kbps S38=6 40 kbps S38=7 42 kbps S38=8 44 kbps S38=9 46 kbps S38=10 48 kbps S38=11 50 kbps S38=12 52 kbps S38=13 54 kbps S38=14 56 kbps AT command set result codes The following table shows the result codes.
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S-Registers AT command set result codes 47 Command Set Result Codes Table (Continued) Result Code Numeric ERROR Description 4 Invalid command CONNECT 1200 EC 5 Connection at 1200 bps NO DIAL TONE 6 No dial tone detected * BUSY 7 Busy signal detected * 10 Connection at 2400 bps * 11 Connection at 4800 bps CONNECT 2400 EC CONNECT 4800 EC CONNECT 9600 EC* 12 Connection at 9600 bps * 13 Connection at 14400 bps * CONNECT 19200 EC 14 Connection at 19200 bps CONNECT 7200 EC* CO
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48 S-Registers AT command set result codes Command Set Result Codes Table (Continued) Result Code Numeric Description CONNECT 57600 EC* 18 Connection at 57600 bps (DTE rate) CONNECT 115200 EC* 87 Connection at 115200 bps (DTE rate) CONNECT 32000 EC* 70 Connection at 32000 bps (56K mode) or V.90 CONNECT 34000 EC* 71 Connection at 34000 bps (56K mode) CONNECT 36000 EC* 72 Connection at 36000 bps (56K mode) or V.
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S-Registers AT command set result codes 49 Command Set Result Codes Table (Continued) Result Code Numeric Description CONNECT 52000 EC* 80 Connection at 52000 bps (56K mode) or V.90 CONNECT 54000 EC* 81 Connection at 54000 bps (56K mode) CONNECT 56000 EC* 82 Connection at 56000 bps (56Kflex mode) CONNECT 28000 EC* 100 Connection at 28000 bps (V.90 mode) CONNECT 29333 EC* 101 Connection at 29333 bps (V.90 mode) CONNECT 30666 EC* 102 Connection at 30666 bps (V.
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50 S-Registers AT command set result codes Command Set Result Codes Table (Continued) Result Code Numeric Description CONNECT 45333 EC* 109 Connection at 45333 bps (V.90 mode) CONNECT 46666 EC* 110 Connection at 46666 bps (V.90 mode) CONNECT 49333 EC* 111 Connection at 49333 bps (V.90 mode) CONNECT 50666 EC* 112 Connection at 50666 bps (V.90 mode) CONNECT 53333 EC* 113 Connection at 53333 bps (V.90 mode) CONNECT 54666 EC* 114 Connection at 54666 bps (V.
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Chapter 5 Error-correction overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operation modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Flow control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Data compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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MNP and V.42 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.
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MNP and V.42 Operation modes 53 The protocol of both modems must be the same. Therefore, if the remote modem supports only class 3 or below, the protocol for the remote modem will be used. If the remote modem does not use MNP, the communication will be made at the speed of the remote modem. V.42 error correction The V.42 (ITU-T-Rec V.42) protocol is recommended by the ITU (International Telecommunications Union). V.
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54 MNP and V.42 Flow control Commands (\ Nn) The following N modulation handshake commands are used to set the communication mode: \N0, \N1 Remote modem unable to use MNP or V.42 \N2 Remote modem uses MNP \N3 Uncertain if remote modem can use MNP or V.42 \N4 Remote modem uses V.42 \N5, \N7 Same as \N3 For details, refer to “AT Commands” on page 13.
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MNP and V.42 Flow control 55 The modem card has two kinds of flow control: ❖ Serial port flow control ❖ Modem port flow control (only in reliable mode) Computer Modem DTE Transmit Receive Buffer DCE Phone line Phone Circuit Buffer Serial port flow control Modem port flow control Flow control Serial port flow control Serial port data flow is controlled by the modem in its communication with a personal computer.
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56 MNP and V.42 Flow control 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 transmission halt request. The XON code makes a transmission restart request. Since these two codes, XON and XOFF, are used as flow control characters, binary data that includes these two codes cannot be transmitted or received.
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MNP and V.42 Data compression 57 If data transmission from the modem under serial port flow control is interrupted because the computer cannot catch up with it, modem port flow control is applied to the remote modem so that transmitted data will not exceed buffer capacity. This flow control functions in normal mode only. Data compression Protocols MNP class 5 and V.42bis are included in the modem to compress data received from the computer.
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Chapter 6 Test description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 Testing procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Test Function Normally, data communications are executed by connecting your computer and modem to those of a remote station with a communication line. If any errors or malfunctions are encountered, it is necessary to check whether the cause is in the local station, the remote station or the communication line. Test description This internal modem has a local/analog/loopback test function that identifies the cause of a malfunction.
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60 Test Function Testing procedure Modem Computer Transmission Reception Transmitter Receiver Local/analog/loopback test Testing procedure To conduct the loopback test: 1 Enter the following AT commands to set the modem to normal mode: AT&F\N0 Receive OK
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Test Function Testing procedure 2 61 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. 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.
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Appendix A
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Specifications This appendix summarizes the Toshiba internal modem’s technical specifications.
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64 Specifications Communication specifications Communication system Communication protocol Data: Full duplex Fax: Half duplex Data ITU-T-Rec V.21 / V.22 / V.22bis / V.32 / V.32bis / V.34 / 56K / V.90 Bell 103/212A Fax ITU-T-Rec V.17 / V.29 / V.27ter (Former CCITT) Communication speed Transmitting level /V.
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Appendix B
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Communication Conditions Communication parameters Select communication parameters from the table below.
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Communication Conditions 67 Telephone line types This internal modem can be connected to 2-wire analog subscriber telephone lines (POTS lines) only. Connectable lines (2-wire) ❖ Ordinary analog telephone lines with direct connection ❖ Corporate analog lines connected to a PBX ❖ Analog lines connected to a PBX, which, for example, provide dial tone when the handset is picked up and permit outgoing calls by dialing 9.
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68 Communication Conditions If you connect to the dialed number, the line is tone dial type. If you do not get a connection, it is pulse dial type. The command ATDP will connect a pulse line.
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Glossary Acronyms bps or BPS:Bits per Second COM1: Communications Port 1 (serial port) COM2: Communications 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 69
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70 Glossary LFB: Linear Frame Buffer LPT1: Line Printer Port 1 (parallel port) MB: Megabyte MIPS: Millions of Instructions per Second PBX: Private Branch Exchange PCI: Peripheral Component Interconnect PIO: Programmed Input/Output RFI: Radio Frequency Interference ROM: Read-Only Memory RTC: Real-Time Clock SIMM: Single Inline Memory Module SPB: Synchronous Pipeline Burst (cache) UART: Universal Asynchronous Receiver/Transmitter URL: Universal Resource Locator USB: Universal Serial Bus VCR: Video Cassette
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Glossary 71 American National Standards Institute (ANSI) character set: The set of characters available in Microsoft Windows (or other operating system). The character set includes letters, numbers, symbols and foreign language characters. American Standard Code for Information Interchange (ASCII): A set of 256 binary codes that represent the most commonly used letters, numbers and symbols. See also binary. animation: A technique of imparting motion to items, either drawings or inert objects.
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72 Glossary buffer: An area of memory where information is held until it can be processed. Buffers are frequently used to compensate for the fact that some parts of the system are faster than others. For example, the computer sends information to a printer much faster than even the fastest printer can handle it. A print buffer stores printer information, enabling the computer to continue with other tasks. As the printer prints a page, it looks in the buffer to see what to do next.
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Glossary 73 Class 1: A standard for fax transmission. The Toshiba internal modem supports class 1. choose: To use the mouse or keyboard to select a menu item, a button or an icon. click: To press and release a mouse button. In Windows, refers to the left mouse button, unless otherwise stated. COM1 and COM2: Names that the operating system gives the computer’s serial ports to distinguish between them. commands: Instructions that tell the computer and its devices what to do.
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74 Glossary DCE (Data Communications Equipment or Data Circuit-terminating Equipment): A device that establishes, maintains and terminates a session on a network. It may also convert signals for transmission. It is typically the modem. DCD signal: This signal tells the personal computer whether 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.
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Glossary 75 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. Error control: Detection of errors in data communication. Requests retransmission of data in which errors were found. Escape control: This code is used to return to the command state without disconnecting the line when the internal modem is online.
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76 Glossary handshake: After a telephone line is connected from one station to another, some signals are exchanged according to the ITU-T or Bell standard to confirm that the standard is the same between the calling and called stations prior to starting data communication between them. This exchange of signals is called handshake.
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Glossary 77 modem: A device for transmitting computer information over telephone lines. A modem converts (modulates) digital information for transmission and also converts (demodulates) information it receives back to digital format. Many modems also interpret and execute commands received from the computer. modem port: The port to send and receive data to and from the modem of a remote station.
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78 Glossary protocol: A set of rules and conventions that makes it possible to transfer information between computers. If you’re transmitting a file, both modems must use the same protocol—just as two people talking on the telephone must speak the same language to communicate effectively. Examples of modem protocols are V.34, V.42, and V.90. Public line: A line served by a telephone company to be connected to an opposite station via the exchange.
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Glossary 79 S-Register: The S-Register stores the parameters for various commands and modem operations. synchronous: Having a constant time interval between successive bits, characters or events. Synchronous data transmission requires both the sending and receiving devices to use special synchronizing characters to correct variations in timing between the devices. See also asynchronous.
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Index Numerics 56K technology xiii A analog/loopback test 59 answer command 14 AT command set result codes 46 AT commands answer command 14 communication standard setting 14 data carrier detect 25 data compression control 33 data terminal ready (DTR) 26 dial a telephone number 15 dial tone detect 24 display result codes 23 echo command 16 error control mode selection 31 escape sequence 14 extended result codes 24 format 13 guard tone control 27 hook control 16 load factory settings 26 local flow control s
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Index view active configuration and stored profile 28 C call receiving 9 terminating 9 Clear To Send 10 communication standard setting 14 communications dial mode types 67 facsimiles 11 handshake commands 54 modes 54 parameters 66 protocols supported xv specifications 63 telephone line types 67 connecting internal modem 5, 6 connecting to a telephone line 8 connection procedures 5 CTS/RTS 10 D data carrier detect 25 data compression 57 data compression control 33 data terminal ready (DTR) 26 default sett
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82 Index M MNP protocol 52 modem connecting internal 5 flow control function 54 modem port 55 serial port 55 maximum connection speed 34 protocol settings 34 protocols xiii MS command 34 N N modulation handshake 21 O operation modes 53 normal 53 reliable 53 P protocol result code 32 protocols MNP 52 V.
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Index test function loopback test 60 transfer on/transfer off 10 V V.42 protocol 53 V.