Downloading Through The Console Port Using Xmodem - 3Com H3C S7503E-S CHASSIS Installation Manual

Attaching network interf
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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):
After the above steps, you have completed the downloading of the host software package.
To complete the host software upgrade, you need to set the main/backup attribute of the host software.
For details, refer to "Setting the Main and Backup Host Software Through the Boot Menu" on page 6-11.
If you need to upgrade the Boot ROM on the SRPUs through the boot menu, refer to section "Updating
Boot ROM Through a File on the Flash" on page 6-12.

Downloading Through the Console Port Using XMODEM

Introduction to XMODEM
The XMODEM protocol is a file transfer protocol widely used due to 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, XMODEM supports checksum, CRC, and error packet retransmission mechanism.
Normally, the maximum number of transmission attempts is 10.
XMODEM transmission is completed by the receiving and sending program. The receiving program
initiates packet checking method negotiation by sending the negotiation character. After negotiation, the
sending program starts packet transmission. Upon the receipt of a complete packet, the receiving
program checks it using the negotiated checking method. If the check succeeds, the receiving program
sends an acknowledgement character; if the check fails, it sends a negative acknowledgement
character. Upon the receipt of an acknowledgement, the sending program continues to send the next
packet; upon the receipt of a negative acknowledgement, it retransmits the packet.
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