Upgrading The Bootware Through A Ethernet/Serial Interface - 3Com WX5004 AC 4GE COMBO Installation Manual

BootWare operation submenu
Enter 7 on the BootWare main menu to enter the BootWare operation submenu. The system displays:
===========================<BootWare Operation Menu>============================
|Note:the operating device is cfa0
|<1> Backup Full BootWare
|<2> Restore Full BootWare
|<3> Update BootWare By Serial
|<4> Update BootWare By Ethernet
|<0> Exit To Main Menu
================================================================================
Enter your choice(0-4):
Storage device operation submenu
Enter 9 on the BootWare main menu to enter the storage device operation submenu. The system
displays:
================================<DEVICE CONTROL>================================
|<1> Display All Available Nonvolatile Storage Device(s)
|<2> Set The Operating Device
|<3> Set The Default Boot Device
|<0> Exit To Main Menu
================================================================================
Enter your choice(0-3):

Upgrading the BootWare Through a Ethernet/Serial Interface

To upgrade the BootWare through a serial interface, use the XMODEM protocol.
XMODEM is a file transfer protocol that is widely used due to its simplicity and good performance.
XMODEM transfers files through serial interfaces. 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 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 character to negotiate a packet 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 check method.
If the check succeeds, the receiving program sends an acknowledgement character and the
sending program proceeds to send another packet.
If the check fails, the receiving program sends a negative acknowledgement character and then the
sending program retransmits the packet.
5-7
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