User manual US ROBOTICS 005699-00

[. . . ] Robotics, and Winmodem are registered trademarks and Connections, RapidComm, MacComCenter, and x2 are trademarks of 3Com Corporation. Windows is a registered trademark of Microsoft Corp. Macintosh is a registered trademark and Mac is a trademark of Apple Computer, Inc. CompuServe is a registered trademark of CompuServe Inc. [. . . ] class 1 and 2. 0 International standards used by fax application programs and faxmodems for sending and receiving faxes. cyclic redundancy checking (CRC) An error-detection technique consisting of a test performed on each block or frame of data by both sending and receiving modems. The sending modem inserts the results of its tests in each data block in the form of a CRC code. The receiving modem compares its results with the received CRC code and responds with either a positive or negative acknowledgment. data communications The transmission or sharing of data between computers via an electronic medium. data compression table A table containing values assigned for each character during a call under MNP5 data compression. Default values in the table are continually altered and built during each call: The longer the table, the more efficient throughput gained. data mode Mode used by a modem when sending and receiving data files. DCE Data Communications (or Circuit-Terminating) Equipment, such as dial-up modems that establish and control the data link via the telephone network. default Any setting assumed, at startup or reset, by the computer's software and attached devices. The computer or software will use these settings until changed by the user or other software. 7-3 GLOSSARY detect phase In the ITU-T V. 42 error-control protocol, the first stage in establishing if both modems attempting to connect have V. 42 capability. dictionary The term used for compression codes built by the V. 42 bis data compression algorithm. digital loopback A test that checks the modem's RS-232 interface and the cable that connects the terminal or computer and the modem. The modem receives data (in the form of digital signals) from the computer or terminal, and immediately returns the data to the screen for verification. digital signals Discrete, uniform signals. In this manual, the term refers to the binary digits 0 and 1. DTE Data Terminal (or Terminating) Equipment. A computer that generates or is the final destination of data. duplex Indicates a communications channel capable of carrying signals in both directions. Electronic Industries Association (EIA) Group which defines electronic standards in the U. S. error control Various techniques that check the reliability of characters (parity) or blocks of data. V. 42 and MNP error-control protocols use error detection (CRC) and retransmission of flawed frames (ARQ). [. . . ] Centre de guarantie et de service aprèsvente: Keating Technologies 25 Royal Crest Court, Suite 200 Markham, ONT L3R 9X4 3Com Corporation Limited Warranty 3Com warrants this hardware product to be free from defects in workmanship and materials, under normal use and service, for the lifetime of the product from the date of purchase from 3Com or its authorized reseller. 3Com's sole obligation under this express warranty shall be, at 3Com's option and expense, to repair the defective product or part, deliver to Customer an equivalent product or part to replace the defective item, or if neither of the two foregoing options is reasonably available, 3Com may, in its sole discretion, refund to Customer the purchase price paid for the defective product. All products that are replaced will become the property of 3Com. Replacement products may be new or reconditioned. [. . . ]