Nextel comm Modem IR1200 User Manual download pdf (Page 113)

Appendix A: Glossary

RFM-4000-5015 Rev1

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Appendix A: Glossary

This glossary contains terms and definitions used within this guide. It is by no

means exhaustive of terms that you may come across.

ASCII

American Standard Code for Information Interchange. A standard set of 128

characters, symbols and control codes used for computer communications.

ASCII characters require 7 bits of data to send, but are often sent 8 bits at a

time with the extra bit being a zero.

Asynchronous Communication

A method of sending data in which the bits can be sent at random times. Data

transmission is not synchronized to a clock. With asynchronous transmission,

each character is transmitted one at a time with a “start” bit at the beginning

and one or more “stop” bits at the end. Any amount of time can elapse before

the next character can be sent.

AT Command

An order entered into the computer to request your modem to perform certain

actions, such as dial a telemodem number. AT commands are Hayes-

compatible modem commands.

Baud

The signaling rate of a line, which is the number of transitions (voltage or

frequency changes) that are made per second.

Baud Rate

Signaling speed of the modem. Common baud rates are 2400, 4800, 9600,

19200, and 56k.

Byte

A data unit of eight bits.

Circuit Switched Data

A networking technology that provides a temporary, but dedicated, connection

between two stations no matter how many switching devices the data is routed

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Nextel comm Modem IR1200 User Manual Page 113