3Com 1.024.1644-00 manual 42 bis, Xmodem, Ymodem G, Zmodem

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Glossary

V.42

An ITU-Tstandard for modem communications that defines a two-stage process of detection and negotiation for LAPM error control.

V.42 bis

An extension of ITU-TV.42 that defines a specific data compression scheme for use during V.42 connections.

Xmodem

The first of a family of error control software protocols used to transfer files between modems. These protocols are in the public domain and are available from many bulletin board services.

XON/XOFF

Standard ASCII control characters used to tell an intelligent device to stop/resume transmitting data.

Ymodem

An error-checking protocol that can send several files of data at a time in 1024-byte (1K) blocks. This protocol can use either checksums or CRC for error checking.

Ymodem G

This is similar to Ymodem, except it relies on the modem for error checking, which makes it faster.

Zmodem

This is similar to Xmodem and Ymodem, except it includes batch transfer, the ability to recover from a partially complete transfer, an autostart feature, and improved efficiency.

56K Voice Faxmodem Internal - User’s Guide

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Contents 56K Voice Faxmodem Internal Page Table of Contents Page Table of Contents Page Welcome to 56K*Information Access Product Features Back Channel Link Rates Upload Speeds Flash ROM Upgradable Control Panel Determining Available ResourcesDetermining Your Version of Windows Click PropertiesWindows 95 version How to Prepare for Plug and Play Installation Plug and Play InstallationSerial Number How to Insert the Modem into the ComputerPage Page Page Page Moving Through the New Hardware Found Screens Installing Modem Drivers With Windows Versions 950 and 950aPage COM Port Click More Info… Using the Update Device Driver Wizard Screens Installing Modem Drivers With Windows Version 950bPage COM Port Click More Info… Word about COM Ports and IRQs How to Change the Modem’s Settings Page How to Insert the Modem into the Computer Page Page Page Page Restart Now Windows Software InstallationType of Modem Initialisation StringFlow Control Read This First Possible SolutionTroubleshooting Possible Solution Possible Solution Possible Solution Troubleshooting Possible Solution Support Resources Support Resources Are You Still Having Problems?Answer mode Analogue signalsAnalogue loopback ApplicationGlossary Baud rate Glossary Auto dialBinary digit bit Bit rateGlossary Character Data modeCharacters per second CPS Class 1Detect phase DefaultDigital signals GlossaryFax mode Glossary Error controlFacsimile Flow controlModem Local echoNonvolatile memory Nvram OFF/ON hookGlossary Online fallback/fall forward Originate modeParity ProtocolSerial transmission Terminal modeStart/stop bits Terminal27ter 22 bis32 bis See online fall back/fall forwardXmodem 42 bisYmodem Ymodem GTechnical Reference ITU-T answer sequence Technical ReferenceDials the specified phone number, includes the following En Sets local echoTechnical Reference Hn Controls ON/OFF hook Ln Controls speaker volume internals onlyDisplays the following information Mn Operates speakerVerbal codes Numeric codes11/RINGING Technical Reference Sets result code displayed, default isTechnical Reference Displays a list of ampersand & commands Resets modemAn Enables/disables additional result code subsets see Xn Cn Controls Carrier Detect CD signalKn Enables/disables data compression Fn Loads a read-only non-programmable factory configurationSets Guard Tone Hn Sets Transmit Data TD flow control see also &Rn300 bps Sets pulse rotary dial make/break ratio No restrictions on the minimum speed for Yn Sets break handling Wn Writes current configuration to Nvram templates64 56K Voice Faxmodem Internal User’s Guide Registers Register Default FunctionBit Value Result Default FunctionS13 Technical Reference Register Default FunctionTimer S27 See the instructions for S13 S34 Bit +FCLASS=n Sets the mode of operation Fax Commands+FTH=n +FRH=nDisplayed As a number Words Description CE Compliance RegulatoryLimited Warranty