Installation Manual
H3C S5600 Series Ethernet Switches
Chapter 5 Loading Boot ROM and Host Software
5-3
5.2.2 Loading Software from Console Port Using XModem
I. Introduction to XModem
XModem is a file transfer protocol widely used for its simplicity and good performance.
XModem transfers files through the console port, supporting data packets of 128 bytes
and 1 KB. With respect to reliability, it supports checksum, CRC, and the error packet
retransmission mechanism. Normally, the maximum number of retransmission
attempts is ten.
XModem transfer is completed by receiving and sending programs together. Receiving
program initiates packet checking method negotiation by sending the negotiation
character. If negotiation passes, the sending program starts packet transfer. Upon
receipt of a complete packet, the receiving program checks it using the agreed-upon
check method. If the check succeeds, the receiving program sends an
acknowledgement character; if the check fails, it sends a reject character. Upon receipt
of the acknowledgement, the sending program continues to send the next packet; upon
receipt of the reject, it retransmits the packet.
II. Loading BootROM
Follow these steps to download the Boot ROM program:
Step 1: Enter <6> or <Ctrl + U> in the Boot Menu to access the Boot ROM loading
menu shown below:
Bootrom update menu:
1. Set TFTP protocol parameter
2. Set FTP protocol parameter
3. Set XMODEM protocol parameter
0. Return to boot menu
Step 2: Enter <3> in the loading menu to download through XModem. The system
displays the following download speed setting menu:
Please select your download baudrate:
1. 9600
2. 19200
3. 38400
4. 57600
5. 115200
0. Return
Enter your choice (0-5):5
Step 3: Choose an appropriate download baud rate. Enter <5> for example to
download at 115200 bps. The system displays the following information:
Are you sure to update your bootrom?(Y/N)
