Allied Telesis AT-TS90TR - Manual (Page 31)

AT-TS90-TR 10Base-T Switch With 100Base-T Access
21
Power-up Diagnostics
The AT-TS90TR performs an extensive set of diagnostic self-tests
whenever any of the following events occur:
❑ Power-up
❑ The device is reset using the front panel Reset button
❑ The device is reset using the NMS
❑ There is an automatic reset in response to a non-recoverable failure
The power-up diagnostic self-tests check processors, memory and other
critical hardware components. All diagnostic software is stored in non-
volatile memory (EPROM).
Power-up LED
Sequence
If you miss part of the power-up diagnostics sequence, you may want to
repeat it. To restart the power-up sequence, press the reset button. You
may also remove, then reinstall the power cord. The unit does not have a
power on/off switch.
When you apply power or reset the AT-TS90TR, the following normal
sequence occurs:
1. All Network Load LEDs turn on for one second.
2. All Link LEDs turn on while a random pattern of Network Load LEDs
flash for several seconds indicating the internal diagnostic sequence is
running.
3. After several seconds, the Port Link LEDs and the Network Load LEDs
turn off (if there are no connections) and the Fault and Power LEDs
show a steady green.
4. Within several more seconds, the Port Activity LEDs will indicate
normal network traffic indicating that the power-up diagnostics
sequence is complete and the unit is ready for operation.
❑ Note that Port Link LEDs will only turn on for those ports with
good links.
If a critical component fails diagnostics, the Fault LED will turn red and
the AT-TS90TR will attempt to reboot. If, after you have tried power
cycling the unit, the Fault LED stays on, contact ATI Technical Support.
If the power-up diagnostics fail, the unit may also stop, or “hang”, with a
diagnostic code displayed on the Activity LEDs and the Fault LED may not
be turned on. Again, try power-cycling the unit before contacting ATI
Technical Support.
Specific Power-up
Tests
The power-up diagnostic tests performed on the AT-TS90TR include:
❑ ROM checksum test
❑ Instruction/Data memory test
❑ Memory map test
❑ Interrupt test
Note