USRobotics x2/56K, 33600 user manual Bits, Bps, Buffer, Carrier, Cps

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Bit

A 0 or a 1 reflecting the use of a binary numbering system (a system that consists of 2 values). This system is used because the computer only recognizes two states, off or on.

(Start/Stop bits) Signaling bits attached to a character before it is transmitted; used for asynchronous transmissions.

Bits

(Start/Stop bits) Signaling bits attached to a character before it is transmitted; used for asynchronous transmissions.

Bps

The rate in bits per second. Thousands of bits per second are expressed as kilobits.

Buffer

An area of memory used as temporary storage during input/output operations. The modem has, for example, a command buffer.

Carrier

Continuous frequency that can be modulated or act as a support to another data carrier signal. Carrier waves are generated and maintained by modems via the telephone companies' transmission lines.

Cps

Data transfer rate (Characters per second). It is generally estimated from the binary rate and the length of characters. For example, at 2400 bits/s, 8-bit characters with a start and stop bit (for a total of 10 bits per character) are transmitted at an approximate rate of 240 characters per second (cps). Some protocols, such as the error correction protocols in the modem use advanced techniques requiring longer transmission frames and data compression to increase the number of characters per second.

62 Sportster Winmodem 33600 & x2/56K - User's manual

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Contents User’s Manual 1997 Table of Contents Voice Functions Appendix B Technical SpecificationsGlossary Limited Warranty Appendix a Technical ReferenceIntroduction How a Modem WorksHow Does Your Sportster Winmodem 33600 & x2/56K∗ Work ? QuicklyEfficiently Other FeaturesAccurately With WindowsPackage Contents Installation Sportster Winmodem 33600 & x2/56K InstallationPlug and Play Installation Procedure Insert the Modem Into the ComputerPlug in the power plug and turn the computer on Run the Modem’s Installation Program If you choose Then try This COM port This IRQ Running the Installation Program on a Windows 95 System Installing the Communications Software Page Changing Country Setup under Windows Page Using the Modem Installation TestFactory Settings Resetting the Modem to Factory Settings Remarks on Using the Modem Remember the Following Points When Using the ModemUn-Installing the Modem Page Troubleshooting Problems and SolutionsSymptom Solution Respond when, Send AT commandsModem does not Terminal mode, youErrors Tone when you try toUsing a certain There is no audibleConnects itself Connection problemModem Correctly toIntercontinental Transmission errorsA fax, errors alter Connections areBefore the Modems Connect Though you are Signals but fail toIf your PC reacts as Online, but no callLink. During Data Transfers If your screen displays random or garbage charactersDuring Fax Transmissions If You Are Still Having Problems Page Voice Functions Overview of Voice FunctionsImplementing Voice Functions Application SettingsSpeakerphone Voice ApplicationsInput/Output Source Selection Page Main AT commands Appendix a Technical ReferenceBasic Command Set E0 Echo OFF E1 Modem displays keyboard commands Hn Controls ON/OFF hook Ln Controls speaker volume internals onlyFn Sets online local echo of transmitted data ON/OFF Displays the following informationXn Sets result code displayed. Default is Vn Displays verbal/numeric result codesXn Setting Result CodesFunctions Advanced Command Set Sets Guard Tone Enables/disables data compressionSets Error Control ARQ 1200 bps and higher Sets Transmit DataTD flow controlSets Receive Data RD hardware flow control Writes current configuration to Nvram templatesSets pulse rotary dial make/break ratio Controls Data Set Ready DSR operationsReg Default Function RegistersSets the number of seconds the modem Page Bit Value Result Reg Default Function Reg Default Function Page Bit 4 Bit Result BitValue 128 Reserved Page Page Sportster Winmodem X2/56K Specifications Electrical power Safety CE MarkElectromagnetic Compatibility Page Asynchronous transmission Analog signalsGlossary Baud rateBps BitBits BufferError correction Data modeDigital signals DuplexFlow control Fax modeFallback Local EchoParity ProtocolRemote Echo Synchronous transmission Terminal modeSerial transmission TerminalXON/XOFF Page Limited Warranty Advised of the Possibility of Such Damages Page 024.1388-00