IBM 10/100 Ethernet Mini-PCI Adapter User Manual page 29

File transfer
protocol
ZMODEM
YMODEM
YMODEM-G
XMODEM
KERMIT
ASCII
Guidelines for using file transfer protocols
Attention: When you share files, you risk getting a computer virus. Use virus scanning
software to ensure that the files you receive and send do not contain computer viruses.
For best results when sending or receiving a file, use the following guidelines:
• Use the ZMODEM ftp if both computer systems support it.
• Both the sending and receiving modem must use the same ftp. BBS or online services
usually inform you which protocols are available.
• Most communications software packages must be informed of the name of the
sending (uploading) or receiving (downloading) file before a file transfer can begin,
and when a file transfer is about to occur. For more information on file transfers, refer
to your communications software manual.
Description
This ftp transfers files in a streaming protocol,
making it very fast even with error correction. It also
provides an automatic receive function that saves
you steps when receiving data.
This is an error-correcting ftp that sends information
in 1024-byte (1k) blocks. Checksums are done on
each block and the result is sent with the block. If
the result does not check out at the receiving end, a
NAK (negative acknowledgement) is sent to
retransmit that block. If the block checks out, an
ACK (acknowledgement) is sent.
This ftp is a variation of YMODEM that is designed
for modems that support error control. It does not
provide error correction or recovery, but relies on
the modem to provide it. If any block is
unsuccessfully transferred, the entire transfer is
canceled.
This is an error-correcting ftp that sends information
in 128-byte blocks. Checksums are done on each
block and the result is sent with the block. If the
result does not check out at the receiving end, a
NAK (negative acknowledgement) is sent to
retransmit that block. If the block checks out, an
ACK (acknowledgement) is sent.
This is a reliable asynchronous ftp that can
communicate successfully with almost any system.
This portability significantly reduces throughput.
This ftp sends TEXT ONLY files directly to the
computer screen, and is very slow. ASCII protocol
cannot transfer binary or graphics files.
3. Connecting and using the 3Com V.90 Mini-PCI modem
3-3