H3C Technologies H3C MSR 20-1X - Manual (Page 59)

52
• If the check is passed, the receiver sends an acknowledgement message to the sender. Upon
receiving the message, the sender continues to send the next packet.
• If the check fails, the receiver sends a negative acknowledgement message to the sender. Upon
receiving the message, the sender retransmits the packet.
Modifying Serial Interface Parameters
Sometimes, we need to increase the baud rate of a serial interface to save software upgrade time, or
lower the baud rate to guarantee transmission reliability. This section describes how to adjust the baud
rate of a serial interface.
Enter 2 in the main BootWare menu to enter the serial interface submenu. Then, enter 5 and the system
prompts for changing a baud rate.
============================================================
|Note:'*'indicates the current baudrate |
| Change The HyperTerminal's Baudrate Accordingly |
|----------------------------------------------------|
|<1> 9600(Default)* |
|<2> 19200 |
|<3> 38400 |
|<4> 57600 |
|<5> 115200 |
|<0> Exit |
==========================================================================
Enter your choice(0-5):
Select a proper baud rate, 5 for 115200 bps for example. The following prompt appears:
Baudrate has been changed to 115200 bps.
Please change the terminal's baudrate to 115200 bps, press ENTER when ready.
Since the baud rate of the serial interface on the router is changed to 115200 bps, whereas the terminal
baud rate remains 9600 bps, they cannot communicate with each other. Change the baud rate on the
console terminal to the one selected for downloading software.
Perform the following configurations on the console terminal:
Figure 37 Disconnect terminal
Select File > Properties, and press Configure… to change the baud rate to 115200 bps: