XMODEM

A public domain file transfer protocol used in asynchronous data communications, XMO-

DEM organizes data into 128-byte blocks and employs a cyclic redundancy check (CRC) for error control. XMODEM was developed by Ward Christensen in 1977 and quickly became popular in the bulletin board system (BBS) community for file downloads. XMODEM has largely been replaced by ZMODEM.

See also asynchronous, BBS, block, CRC, error control, Kermit, modem, YMODEM, and ZMODEM.

• Challenge Handshake Authentication Protocol (CHAP)
• channel
• channel-associated signaling (CAS)
• channel bank
• channelized voice over DSL (CVoDSL)
• channel service unit (CSU)
• channel width
• CHAP (Challenge Handshake Authentication Protocol)
• character
• character-oriented protocol
• chat room
• check bit
• checksum (summation check)
• chip
• chip rate
• chromatic dispersion
• chrominance
• C-HTML (Compact HyperText Markup Language)
• churning
• CIC (Carrier Identification Code)
• CIC (Carrier Identification Code)
• CIDR (Classless Inter-Domain Routing)
• CIDR (Classless Inter-Domain Routing)
• CIF (Common Intermediate Format)
• CI II (Computer Inquiry II)