3Com Switch 7750 Configuration Guide

Local Software Loading 839
The XMODEM transmission procedure is completed by a receiving program and a
sending program: The receiving program sends negotiation characters to
negotiate a packet checking method. After the negotiation, the sending program
starts to transmit data packets. When receiving a complete packet, the receiving
program checks the packet using the agreed method. If the check succeeds, the
receiving program sends an acknowledgement character and the sending program
proceeds to send another packet; otherwise, the receiving program sends a
negative acknowledgement character and the sending program retransmits the
packet.
Loading BootROM software
Follow these steps to load the BootROM software:
Step 1: At the prompt “Enter your choice(0-5):” in the Boot Menu, press
<Ctrl+U>, and then press <Enter> to enter the BootROM update menu shown
below:
SRPG bootrom update menu:
1. Set TFTP protocol parameter
2. Set FTP protocol parameter
3. Set XMODEM protocol parameter
0. Return to boot menu
Enter your choice(0-3):
Then you can choose different protocols to load BootROM.
Step 2: Enter 3 in the above menu to download the BootROM software using
XMODEM. The system will prompt to enter the name of the BootROM file to load.
Load File name :S7750.btm
The system displays the following download baud rate setting menu:
Please select your download baudrate:
1: 9600
2: 19200
3: 38400
4: 57600
5: 115200
0: Return
Enter your choice(0-5):
Step 3: Choose an appropriate download baud rate. For example, if you enter 5,
the baud rate 115200 bps is chosen and the system displays the following
information:
Download baudrate is 115200 bps
Please change the terminal’s baudrate to 115200 bps and select XMODEM protocol
Press enter key when ready
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If you have chosen 9600 bps as the download baud rate, you need not modify the
HyperTerminal’s baud rate, and therefore you can skip Step 4 and 5 below and