XMODEM
old protocol for data transfer between two computers which are connected by a modem (Computers) | ||||
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XMODEM definition was found in categories: Computer & Internet(5) Language, Idioms & Slang(1) Encyclopedia(1)
XMODEM Definition from Computer & Internet Dictionaries & Glossaries
| FOLDOC |
XMODEM
The "Christensen" file transfer protocol, probably the most widely available protocol used for file transfer over serial lines (e.g. between modems). XMODEM uses 128-byte packets with error detection, allowing the receiver to request retransmission of a corrupted packet. XModem is fairly slow but reliable.
Several variations have been proposed with increasing packet sizes (e.g. XMODEM-1K) and different error detection (CRC instead of checksum) to take advantage of faster modems. Sending and receiving programs can negotiate to establish the best protocol they both support.
Standard XMODEM specifies a one-second timeout during the reception of characters in the data block portion of a packet.
Chuck Forsberg improved upon XMODEM by developing YMODEM and ZMODEM.
[Chuck Forsberg, "XMODEM/YMODEM Protocol Reference"].
(1995-02-02)
The "Christensen" file transfer protocol, probably the most widely available protocol used for file transfer over serial lines (e.g. between modems). XMODEM uses 128-byte packets with error detection, allowing the receiver to request retransmission of a corrupted packet. XModem is fairly slow but reliable.
Several variations have been proposed with increasing packet sizes (e.g. XMODEM-1K) and different error detection (CRC instead of checksum) to take advantage of faster modems. Sending and receiving programs can negotiate to establish the best protocol they both support.
Standard XMODEM specifies a one-second timeout during the reception of characters in the data block portion of a packet.
Chuck Forsberg improved upon XMODEM by developing YMODEM and ZMODEM.
[Chuck Forsberg, "XMODEM/YMODEM Protocol Reference"].
(1995-02-02)
| A Glossary of Internet & PC Terminology |
XModem
A file transfer protocol for modems , which sends data from an Internet host to a PC . The data is sent without acknowledgment from the computer receiving the data.
A file transfer protocol for modems , which sends data from an Internet host to a PC . The data is sent without acknowledgment from the computer receiving the data.
| WebGuest Web Glossary |
Xmodem
Error control software protocol used to transfer files between modems . Sends data in blocks of 128 bytes .
Error control software protocol used to transfer files between modems . Sends data in blocks of 128 bytes .
| INTERNET TERMS&ACRONYMSV1.0 |
XMODEM
An early form of file transmission for dialup and telnet connections.It is slower and uses smaller blocks of data( 128 bits) than ymodem and zmodem.
An early form of file transmission for dialup and telnet connections.It is slower and uses smaller blocks of data( 128 bits) than ymodem and zmodem.
| The Internet Dictionary |
Xmodem
A popular file-transfer protocol developed in 1977 by Ward Christiansen. The protocol works by sending blocks of data in 128-byte blocks from PC to PC. Included with this data is an error-detection system called a checksum. When the data is received, the error detection system ensures that the entire message reached its destination. If not, the receiving computer sends a request for retransmission of the data. Compare with Ymodem , Zmodem .
A popular file-transfer protocol developed in 1977 by Ward Christiansen. The protocol works by sending blocks of data in 128-byte blocks from PC to PC. Included with this data is an error-detection system called a checksum. When the data is received, the error detection system ensures that the entire message reached its destination. If not, the receiving computer sends a request for retransmission of the data. Compare with Ymodem , Zmodem .
XMODEM Definition from Language, Idioms & Slang Dictionaries & Glossaries
| hEnglish - advanced version |
xmodem
xmodem
the "christensen" file transfer protocol, probably the most widely available protocol used for file transfer over serial line s (e.g. between modems). xmodem uses 128-byte packets with error detection, allowing the receiver to request retransmission of a corrupted packet. xmodem is fairly slow but reliable.
similar words(1)
xmodem-1k
xmodem
the "christensen" file transfer protocol, probably the most widely available protocol used for file transfer over serial line s (e.g. between modems). xmodem uses 128-byte packets with error detection, allowing the receiver to request retransmission of a corrupted packet. xmodem is fairly slow but reliable.
similar words(1)
xmodem-1k
XMODEM Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
XMODEM
XMODEM is a simple file transfer protocol developed as a quick hack by Ward Christensen for use in his 1977 MODEM.ASM terminal program. XMODEM became extremely popular in the early bulletin board system (BBS) market, largely because it was so simple to implement. It was also fairly inefficient, and as modem speeds increased this problem led to the development of a number of modified versions of XMODEM to improve performance or address other problems with the protocol. Chuck Forsberg collected a number of these into his YMODEM protocol, but poor implementation led to a further fracturing. His later ZMODEM protocol was so superior that it led to the demise of all of these XMODEM derivatives in the early 1990s.
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