Xmodem

Originally developed in 1977 by Ward Christensen, Xmodem is one of the most popular file-transfer protocols. Although Xmodem is a relatively simple protocol, it is fairly effective at detecting errors. It works by sending blocks of data together with a checksum and then waiting for acknowledgment of the block’s receipt. The waiting slows down the rate of data transmission considerably, but it ensures accurate transmission.

Xmodem can be implemented either in software or in hardware. Many modems, and almost all communications software packages, support Xmodem. However, it is useful only at relatively slow data transmission speeds (less than 4,800 bps).

Enhanced versions of Xmodem that work at higher transmission speeds are known as Ymodem and Zmodem.

Webopedia Staff
Webopedia Staff
Since 1995, more than 100 tech experts and researchers have kept Webopedia’s definitions, articles, and study guides up to date. For more information on current editorial staff, please visit our About page.

Related Articles

DocuSign

What is DocuSign? DocuSign is an agreement management application that enables businesses to create, send, and automate a wide variety of forms and contracts and...

Compliance

What is compliance? Compliance or regulatory compliance is a term used across industries to describe rules and policies that prohibit or regulate specific products, services,...

User Experience

User experience describes a user's interaction with products, systems, and services and includes usability, design, navigation, and impression.

Management Information Systems (MIS)

What is a Management Information System? A Management Information System (MIS) is an information system that provides managers with the tools to effectively organize, evaluate,...

Venture Capital

Venture capital (VC) offers startups and developing businesses growth opportunities with funding from...

Third-Party Apps

A third-party application is an application provided by a vendor other than the...

Ernst & Young (EY)

Ernst & Young Global Limited, commonly known as EY, is a multinational professional...