Loading Software Using Xmodem Through Console Port - H3C S7500 Series Operation Manual

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Operation Manual – System Maintenance and Debugging

H3C S7500 Series Ethernet Switches

Press Ctrl+B to enter Boot Menu... 0

Press <Ctrl+B>. The system displays:

To enter the Boot Menu, you should press <Ctrl+B> within five seconds after the

information "Press Ctrl-B to enter Boot Menu..." appears. Otherwise, the system starts

to decompress the program; and if you want to enter the Boot Menu at this time, you will

have to restart the switch.

Input the correct Boot ROM password (no password is need by default). The system

enters the 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

Enter your choice(0-5):

1.2.2 Loading Software Using XMODEM through Console Port

I. 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 two types of data

packets (128 bytes and 1 KB), two check methods (checksum and CRC), and multiple

attempts of error packet retransmission (generally the maximum number of

retransmission attempts is ten).

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.

Chapter 1 Boot ROM and Host Software

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