Definition

Xmodem

Contributor(s): Paulo Julio Achoa Mello

Xmodem is an error-correcting protocol for modem that was created in 1978 by Ward Christensen and became a de facto standard. Modems that agree on using the Xmodem protocol send data in 128-byte blocks. If a block is received successfully, a positive (ACK) acknowledgement is returned. If an error is detected, a negative (NAK) acknowledgement is returned and the block is resent. Xmodem uses the checksum method of error checking.

See modem error-correcting protocols for a comparison with other error-correcting protocols.

This was last updated in April 2007

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Xmodem

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SearchUnifiedCommunications

Zoom Chat update takes vendor further beyond video

Enhancing communications with a UC-contact center integration

Cisco cries foul over security flaw in Zoom Connector

SearchMobileComputing

Compare Intune alternatives to Intune for mobility management

Deploy kiosk devices with the Managed Home Screen Android app

New Outlook features appeal to users on the go

SearchDataCenter

Top 4 open source automation tools for admins

U.S. facility may have best data center PUE

Increase efficiency with data center temperature monitoring

SearchITChannel

4 SD-WAN vendors integrate with AWS Transit Gateway

Intel partner marketplace to drive ecosystem collaboration

Desktop-as-a-service combo targets channel via Ingram Micro

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