Definition

Xmodem

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.

Related glossary terms: system administrator (sysadmin), ring, Internet, keystone jack, corporate area network (CAN), port, home server, LANDesk Client Manager (LDCM), HomeRF (home radio frequency), local access and transport area (LATA)

Contributor(s): Paulo Julio Achoa Mello

This was last updated in April 2007

Posted by: Margaret Rouse

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