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2 specific power-up tests, 3 software checksum comparison – Cabletron Systems SmartSTACK 100 User Manual

Page 84

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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.