Installation ManualH3C S7500 Series Ethernet Switches Chapter 7 Software Maintenance7-4For Boot ROM upgrade, see section 7.6 "Loading Host Software Containing the BootROM File” on page 7-19.7.2.2 Loading Software from the Console Port Using XmodemI. Introduction to XmodemThe Xmodem protocol is a file transfer protocol widely applied due to its simplicity andperformances. Xmodem transfers files through the console port. It supports 128-byte or1-kilobyte packets, checksum, CRC, and retransmissions (generally 10 times) in caseof packet errors.XModem transmission works through a receiving program and sending program. Thereceiving program first sends a negotiation character requesting for a check method.The sending program starts data packet transmission if the negotiation succeeds. Afterreceiving a complete packet, the receiving program checks the packet using thenegotiated check method. If the check succeeds, the receiving program sends apositive acknowledgement character and the sending program continues to send thenext packet. If the check fails, the receiving program sends a negativeacknowledgement character and the sending program retransmits the packet.II. Updating the Boot ROMFollow these steps to update the Boot ROM:1) After “Enter you choice(0-5)” is prompted in the Boot Menu, press Ctrl+U andEnter to enter the Boot ROM update menu:SRPG bootrom update menu:1. Set TFTP protocol parameter2. Set FTP protocol parameter3. Set XMODEM protocol parameter0. Return to boot menuEnter your choice(0-3):3You can select different protocols to update the Boot ROM.2) Select 3 to update the Boot ROM program using XModem. Press Enter and thenselect the file to be loaded.Load File name :BTM530.btm3) Press Enter to enter the download baudrate menu.Please select your download baudrate:1. 96002. 192003. 384004. 576005. 1152000. Exit
