The Catalyst 2948G-L3 and the Catalyst 4908G-L3 support Xmodem and Ymodem protocols. If all of the system images in the boot flash memory are somehow damaged or erased, you can copy an image from a local or remote computer (such as a PC, UNIX workstation, or Macintosh computer) using the Xmodem or Ymodem protocols. The Xmodem and Ymodem protocols support different speeds of file transfers. The maximum file transfer speed supported is 57600 baud. This functionality primarily serves as a disaster recovery technique where system images are recovered using Xmodem and Ymodem commands on the ROM monitor from the console port on your switch router.