Loading Files Using Xmodem Through Console Port - 3Com Baseline Switch 2900 Series Getting Started Manual

5. Modify BootRom password
6. Enter BootRom upgrade menu
7. Skip current system configuration
8. Set BootRom password recovery
9. Set switch startup mode
0. Reboot
Enter your choice(0-9):
The items in the Boot ROM menu are described in
Currently, Boot ROM files are not provided separately by the 3Com Baseline Switch 2900 Family;
instead, they are stored together with application files in the files with the name extension of .bin.
The procedures for loading Boot ROM files and application files are similar except that you need to
select different items (1 for loading application files, and 6 for loading Boot ROM files) in the Boot
ROM menu. This manual takes the loading of Boot ROM files as examples.

Loading Files Using XMODEM Through Console Port

Introduction to XMODEM
XMODEM is a file transfer protocol widely used for its simplicity. XMODEM transfers files through the
console port, supporting data packets of 128 bytes. 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.
Loading a Boot ROM file
Complete the following tasks to load a Boot ROM file using XMODEM through the console port (For
details about the HyperTerminal, refer to
Enter the Boot ROM update menu on the switch
Enter the protocol parameter setting menu
Configure the switch to download files using
XMODEM
"Setting Terminal
Task
Table 4-2
Parameters" on page 4-2):
Required
Log in to the switch through the HyperTerminal
and then configure the protocol used for loading
files.
5-3
Remarks