- Cabletron Fast Network 10 USER GUIDE

Chapter 6: FN10 Diagnostics and Troubleshooting
Page 6-2 Fast Network 10 User Guide
6.1.1 Power-up LED Sequence
When you power-up the FN10, the following occurs:
1. All LEDs, except for the Port Link LEDs, turn on for one second.
2. The Power (Pwr) LED remains on.
3. The Ready LED starts flashing.
4. After several seconds, the Port Link LEDs turn on briefly.
5. After several more seconds, the Ready LED will stay on, indicating
that the power-up diagnostics sequence is complete.
In addition, the Port Link LEDs will turn on for those ports with good
links and the Segment Status LEDs will turn on (or flash) when the
selected status condition is present.
6.1.2 Specific Power-up Tests
The power-up diagnostic tests performed on the FN10 include:
• ROM checksum test
• Instruction/Data memory test
• Memory map test
• Interrupt test
• Packet memory test
• Shared RAM component test
• Ethernet data loopback test
NOTE
If a critical component fails diagnostics, the Ready LED will turn
off and the FN10 will attempt to reboot. If the Ready LED does
not stay on, contact Cabletron Systems Technical Support.
Refer to Section 1.2.