Specifications
Table Of Contents
- AT-8900 Series Hardware Reference
- Contents
- Models Covered By This Reference
- Why You Should Read This Reference
- Where To Find More Information
- Hardware Description
- Online Documentation
- AT-TFTP Server
- Using Windows Terminal and Windows Hyperterminal
- Switch Start-up
- RS-232 Terminal Port (ASYN0)
- Useful Cables
- Test Facility
- Power Supply Units (PSUs)
- Port, Connector, and Cable Combinations
- Troubleshooting
- Expansion Options
- Restricted Procedures
- Contacting Us

Hardware Reference 13
C613-03075-00 REV A
During the start-up process the switch will generate four different types of
messages. All messages are preceded by one of the words INFO, PASS, FAIL,
or ERROR. The significance of these words is shown in Table 2 on page 13.
The possible messages and their meanings are:
INFO: Self tests beginning.
The code loader tests are about to begin.
INFO: RAM test beginning.
The RAM tests are about to begin.
PASS: RAM test, 131072k bytes found.
The RAM test passed, and the indicated amount of memory was found
and will be used by the switch.
ERROR: RAM test 5. Error address = 00345678.
A RAM test failed, at the given address. In the example, it was the fifth
test run. The RAM test repeats until it passes, so a number of messages
like this may appear. This fault means that the memory system is faulty.
If the fault continues, contact your Authorised Allied Telesyn
distributor or reseller immediately.
INFO: BBR tests beginning.
The BBR battery tests are about to begin.
PASS: BBR test. Battery OK.
The BBR battery tests passed.
ERROR: BBR Battery low.
The BBR battery test failed, indicating that the battery is running low.
The BBR battery will need to be replaced. Contact your Authorised
Allied Telesyn distributor or reseller.
PASS: BBR test, 512k bytes found.
The BBR size/location test passed, with the indicated amount of BBR
found.
Table 1: Switch start-up sequence keystrokes.
Pressing key... Forces the switch to...
[Y] Load the EPROM release, with no patch.
[S] Start with the default configuration. Any boot script is ignored.
[Ctrl/D] Enter diagnostics mode.
Table 2: Switch start-up message classes.
Message Meaning
INFO An action will be taken by the system.
PASS A test has been completed successfully.
ERROR An error message that a test has failed, but the system will continue to
operate.
FAIL An error message that a fatal error condition has caused the system to
halt in an unrecoverable fashion.