Technical data

Using Out-of-Band Access to Transfer Files
303561-A Rev 00
B-3
In support of Bay Networks router file management tasks, the YMODEM batch
protocol has the following capabilities:
• Supports batch file transfers (moving one or more files specified in a single
xmodem command)
• Automatically converts file names received during batch file transfer
operations
• Transfers binary files with error detection
• Marks every transferred file with a timestamp, which indicates the most recent
modification date of a file
• Automatically deletes a file unsuccessfully transferred between a router and a
workstation
• Allows you to cancel a file transfer operation while that operation is still in
progress
YMODEM transfers binary files intact, with no padding, and using a default
packet size of 128 bytes. To use the YMODEM protocol, a Bay Networks router
does not require access (in-band) to the IP network on which a source/destination
remote workstation also resides. Instead, you use out-of-band (dial network)
access from the UNIX or 386/486 DOS workstation to run Technician Interface
xmodem commands and conduct file transfers through a modem. You are most
likely to use the YMODEM protocol to move files when your IP network is down
or impaired.