Cabletron Systems SmartSTACK 100 - Manual (Page 84)

5-2
ELS100-16TX Diagnostics and Troubleshooting
5.1.2 Specific Power-up Tests
The power-up diagnostic tests performed on the ELS100-16TX
include:
• ROM checksum test
• Instruction/Data memory test
• FLASH checksum test
• NVRAM checksum test
5.1.3 Software Checksum Comparison
When the ELS100-16TX reboots, its operational software is verified
by a checksum comparison before it is loaded. If the software fails
the checksum test due to an interrupted new software distribution
procedure, the ELS100-16TX will automatically use its backup
version of software. A backup version of software is always stored
in non-volatile memory.
The operational parameters of the ELS100-16TX software are also
protected by a checksum comparison. When the ELS100-16TX
reboots, if the operational parameters of the ELS100-16TX fail a
checksum test due to a power failure in the midst of a previous
update, the ELS100-16TX automatically uses its backup version of
the parameters.
Note: If a critical component fails diagnostics, the CPU LED will turn off
and the ELS100-16TX will attempt to reboot. If the CPU LED does
not stay on, contact Cabletron Systems Global Call Center. Refer to
Section 1.2.
Note: A backup version of the operational parameters is always stored in
non-volatile memory before any update is attempted.