Toshiba V.90 F, G, H

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 con trol: Detection of errors in data comm unication. 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.

FFIFO: First-In/First-Out means the first data that enters a buffer is the

first to be retrieved.

Fallb ack: Reduction of a modem’s speed. If the remote modem cannot

communicate as fast as the local modem, the local modem will

reduce its speed.

firmware: A set of instructions built into a chip to control its activities.

Flow control: Flow control ensures smooth data communication. If

operating speed differs between the personal computer and modem

or between your modem and a remote modem and if the remote

station runs short of buffer capacity, a transmission halt request is

sent from the receiver to the transmitter. When the receiver has

enough buffer capacity to resume receiving data, a transmission

restart request is sent. There are two ways of flow control, XON and

OFF control codes and CTS and RTS signals.

frequency: The number of times a signal repeats an identical cycle within

a certain time period.

full duplex: A type of data transmission in which data flows between two

devices in both directions simultaneously. See also half duplex.

Ggigabyte (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.

Hhalf duplex: A type of data transmission in which data flows between

two devices in one direction at a time. See also full duplex.

Contents

Main ii FCC Notice Declaration of Conformity Information iii Industry Canada Requirement Pursuant to FCC CFR 47, Part 68: Type of service iv If problems arise Disconnection Fax branding Instructions for IC CS-03 certified equipment v 2 3 Copyright vi Disclaimer Trademarks vii Contents viii Chapter 3: AT Commands........................................................ 13 ix Chapter 4: S-Registers.............................................................. 39 x Page xii Introduction xiii Features xiv xv Function charts The chart below lists the internal modems supported communication protocols: xvi Users guide contents xvii Conventions Abbreviations Keys Key operation xviii Display Messages Page Setup Hardware Setup Function check Page Page Using the Internal Modem Connection procedures Analog or digital? Connecting the internal modem Disconnecting the internal modem Basic operation Connecting to a telephone line Direct access line Extension line Receiving a call Terminating a call Setting the data flow control CTS/RTS control XON/XOFF control Page Page AT Commands AT command formats +++ Escape sequence A/ Repeat last command A Answer command Bn Communication standard setting Dn Dial En Echo command Hn Hook control AT command formats 17 Result Codes: In Request ID information This command displays product information about the modem. Page Page Ln Monitor speaker volume Mn Monitor speaker mode Nn Modulation handshake On Return online to data mode P Select pulse dialing Qn Result code control T Select tone dialing Vn DCE response format Wn Result Code Option Xn Result code selection, call progress monitoring AT command formats Extended result codes Dial tone detect Busy tone detect Zn Recall stored profile &Cn Data Carrier Detect (DCD) control &Dn Data Terminal Ready (DTR) control &F Load factory settings &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 AT command formats 29 Press any key to continue; Esc to quit. &W Store current configuration &Zn=x Store telephone number \Nn Error control mode selection Qn Local flow control selection \Vn Protocol result code %Cn Data compression control -V.90=<n> +MS Command +MS= <carrier>, <automode>, <0>, <max_rate>, <0>, <max_rx_rate> +MS? +MS=? Page Page Page S-Registers S-Register values S0 Auto answer ring number S1 Ring counter S2 AT escape character (user-defined) S3 Command line termination character (user-defined) S4 Response formatting character (user-defined) S5 Command line editing character (user defined) S6 Wait before dialing S7 Connection completion time-out S8 Comma pause time S10 Automatic disconnect delay S11 DTMF dialing speed S12 Escape guard time S37 Dial line rate S38 K56flex Dial line rate S38 56K Downstream Rate AT command set result codes The following table shows the result codes. AT command set result codes 47 Page AT command set result codes 49 Page Page MNP and V.42 Error-correction overview MNP error correction V.42 error correction Operation modes Normal mode Reliable mode Commands (\Nn ) Flow control Serial port flow control XON/XOFF flow control (software) CTS/RTS two-way flow control (hardware) Commands (\Qn, &Kn) Modem port flow control Data compression Commands (%Cn) Page Test Function Test description Testing procedure Page Page Specifications Network control unit (NCU) Specifications Communication specifications Page Communication Conditions Communication parameters Select communication parameters from the table below. Telephone line types Connectable lines (2-wire) Unconnectable lines (4-wire) Dial modes Page Glossary Acronyms A Glossary 71 B C Glossary 73 D E Glossary 75 F G H I K M Glossary 77 N O P R S Glossary 79 T U X Index Numerics A Index 81 C D E F G M N O P R