Allied Telesis AT-S62 - Manual (Page 182)

Chapter 12: File Downloads and Uploads
Section II: Advanced Operations 182
After receiving the file, the switch compares the version numbers of
the new and existing image files. If the new image file has the same or
an earlier version number as the file in the application block, the
switch cancels the update process. If the new image file has a newer
version number, the switch writes the file to the application block
portion of flash memory and then resets.
Caution
The switch will not forward any network traffic while writing the
image to flash and during the reset process. This can take several
minutes to complete.
This completes the procedure for downloading a new AT-S62 image
file from a Telnet management session.