H3C Technologies H3C WA2600 Series WLAN Access Points - Manual (Page 33)

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z Fat and fit files cannot be stored in the Flash at the same time due to the space limitation of the
Flash of the AP. Therefore, before you switch the working mode of the AP from fat AP to fit AP, you
need to delete the fat file in the Flash to release the space of the Flash. When deleting the fat file,
use the delete /unreserved plus name of the file to be deleted in user view (you can view the file
name using the dir command in user view). Then, use TFTP to download the fit file, and set the
working mode of the AP to the fit AP mode.
z When you switch the working mode of the AP at the CLI, the configuration file used for next startup
is set to null. After you reboot the AP, the system starts with the factory default configuration of the
current mode.
Set the working mode to fat AP
To set the working mode of the AP working in the fit AP mode to the fat AP mode, you can execute the
wlan ap-execute ap-name conversion-to-fatap command on the AC or US:
For example, set the working mode of ap1_003 to the fat AP mode:
system-view
[Sysname] wlan ap excute ap1_003 concersion-to-fatap
z After setting the working mode of the AP at the CLI, you need to restart the AP to make your
configuration take effect.
z You can use the wlan ap-execute ap-name conversion-to-fatap command on an AC or a US to
set the working mode of the AP to fat AP only in the case that the AP running as a fit AP is
associated with the AC or US and the fat AP version is stored in the Flash.
Upgrading Applications Through the Serial Port
XMODEM Overview
To upgrade applications through a serial port, use the XMODEM protocol.
XMODEM is a file transfer protocol that is widely used because of its simplicity and good performance.
XMODEM transfers files via serial ports. It supports two types of data packets (128 bytes and 1 KB), two
check methods (checksum and CRC), and error packet retransmission mechanism (generally the
maximum number of transmission 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 character to negotiate a check method.
After the negotiation, the sending program starts to send data packets. Upon receiving a complete
packet, the receiving program checks the packet using the agreed method.
z If the check succeeds, the receiving program sends an ACK character and the sending program
proceeds to send the next packet.