This read-write INTEGER sets the number of seconds the ES/1 waits for an acknowledgment to a data block before it cancels an entire TFTP configuration file session, defaulting to 25 seconds. An administrator extends this to prevent a slow but otherwise healthy transfer over a congested link from being cancelled prematurely. For example, the admin extends swdisConfigTotalTimeout beyond the 25-second default so a config restore over a congested link isn't cancelled before it finishes.