User guide

45 Mbps Backhaul User Guide
Issue 3, December 2004 Page 53 of 113
Figure 24 Software Upgrade Image Check
The user should ensure that the correct image is shown before pressing the “Program Software Image into Non-
Volatile Memory” button. Once this button has been pressed the image is stored into non-volatile memory, this
process can take up to 60 seconds and must not be interrupted.
If the upgrade process is interrupted during the erasure of the image bank or during the reprogramming of the
image bank the image bank will be left in a corrupt state. If this occurs the software must be reloaded. All
software images that are stored in FLASH memory are protected via the use of 32-bit CRCs. If the software
detects a invalid CRC the image bank is marked as ‘corrupt’ and the 45 Mbps Backhaul boot code will boot the
fixed software image. If this occur the user must attempt to reload the correct version of software.