Loading Software Using Xmodem Through Console Port - H3C S5500-SI Series Installation Manual

The loading process of the Boot ROM software is the same as that of the host software, except that
during the Boot ROM loading process, you must enter the different digit after entering the Boot Menu
and the system gives somewhat different prompts. The following text mainly describes the Boot ROM
loading process.

Loading Software Using XMODEM Through Console Port

Introduction to XMODEM
XMODEM is a file transfer protocol that is widely used due to its simplicity and good performance.
XMODEM transfers files via console port. It supports one type of data packets (128 bytes), two check
methods (checksum and CRC), and error packet retransmission mechanism (generally the maximum
number of retransmission attempts is ten).
The XMODEM transmission procedure is completed by the cooperation of a receiving program and a
sending program. The receiving program sends a negotiation packet to negotiate a packet check
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 packet and the sending program
proceeds to send another packet; otherwise, the receiving program sends a negative
acknowledgement packet and the sending program retransmits the packet.
Loading Boot ROM software
Complete the following tasks to update the Boot ROM software using XMODEM through the console
port (For details about the HyperTerminal, refer to
Enter the Boot ROM update menu on the
switch
Configure the switch to download files using
XMODEM
Set the download rate of the console port on
the switch
Change the rate of the serial port on the
terminal
Download the Boot ROM file
Restore the download rate to the default
Task
Setting Terminal Parameters
Required
Log in to the switch through the HyperTerminal and
then configure the protocol used for loading files.
Required
Log in to the switch through the HyperTerminal and
then set the download rate of the console port on the
switch.
Optional
Set the baud rate of the serial port on the terminal to
be consistent with that of the console port on the
switch.
Required
Transmit a file from the terminal to the switch, and
update the Boot ROM file on the switch.
Optional
Set the baud rate of the serial port on the terminal to
be consistent with the default rate of the console port
on the switch.
5-3
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Remarks