Upgrading Software Using Xmodem - 3Com Switch 7700 Installation Manual

S O F T W A R E M A I N T E N A N C E
Note:
To access the BOOT Menu, press Ctrl+B during the 5 seconds that "Press Ctrl-B to enter Boot
Menu..." displays. Within 5 seconds, the system begins program decompression. At this time if you want to access
the BOOT Menu, you must reboot the switch.
Enter the BootROM password. After entering the correct password (no password is set for the switch by default),
the system will access the BOOT Menu:
Caution:
While using the switch, please keep in mind the modified BOOTROM password.
Boot Menu
1: Download application file to flash
2: Select application file to boot
3: Display all files in flash
4: Delete file from flash
5: Modify bootrom password
0: Reboot
Enter your choice(0-5):

7.2. Upgrading Software Using Xmodem

The Xmodem protocol transmits files through serial ports and supports both 128-byte and 1K-byte packets.
Xmodem also supports two types of check; normal checksum and CRC. When there is a packet error,
retransmission is supported, normally 10 times).
The Xmodem protocol completes transmission by receiving and sending programs. The receiving program first
sends the negotiating characters to negotiate the check means. After passing the negotiation, the sending program
begins to send the packet. The receiving program checks the packet according to the negotiated means after
receiving a complete packet. The acknowledgement characters are sent after passing the check and then the sending
program continues to send the next packet. If the check fails, negative characters are sent and the sending program
sends the packet again.
1. Enter 1 in the BOOT Menu and press Enter. The system accesses the download application file 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):3
2. Enter 3 in the download program menu.
3. Select the Xmodem protocol to implement the software upgrade.
4. Press Enter. The system enters the download rate-setting menu:
Please select your download baudrate:
1. 9600
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