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xmodem    
n. 调制解调器的通讯协议之一 ; 文件传输通信协议

调制解调器的通讯协议之一 ; 文件传输通信协议

{Ward Christensen}'s 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.

John Mahr wrote the original XMODEM CRC error correction code.
This implementation was backward compatible with Christensen's
original checksum code. It improved the error detection from
98% to 99.97% and improved the reliability of transmitting
{binary files}.

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"].

(2005-09-16)


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    You probably also want to disable xon xoff for xmodem just in case there are any XON or XOFF bytes in the file you are sending, so use the -ixon option e g for 115200,n,8,1 you would use: stty -F dev ttyUSB0 115200 cs8 -parenb -cstopb -ixon See man stty for more details
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    If you really must use XMODEM, you can speed up the console port from 9600bps to somewhere around 115200 or higher, but I've found if you go much above 115200, the XMODEM transfer takes quite a few errors I believe the command to do this is somthing similar to: set baud Once you enter the command, you will be disconnected from the console
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    I have to use xmodem to recover IOS for switch 3750 because the current ios was lost when i tried to type: copy xmodem: flash:c3750-ipbasek9-mz 122-35 SE5 bin i got "Begin the Xmodem or Xmodem-1K transfer now " So I began send file
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    Xmodem Procedure for Downloading a Cisco IOS Software Image onto a Cisco 2620 Router Xmodem Procedure for Downloading a Cisco IOS Software Image onto a Cisco 3600 Router Related Information Introduction This document explains how to use the xmodem command at the console to download Cisco IOS® software using the ROM monitor (ROMmon) Before You





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