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CHAPTER 5ELS10-26 DIAGNOSTICS AND TROUBLESHOOTING
The ELS10-26 incorporates built-in diagnostic and testing
capabilities which are convenient to use and cause minimal or no
disruption to the rest of the operational network. These capabilities
are effective for isolating problems within the ELS10-26 unit. Built-
in diagnostic capabilities include:
• System-wide power-up diagnostics, which are run every time
the system is powered up or reset.
5.1 POWER-UP DIAGNOSTICS
The ELS10-26 performs an extensive set of diagnostic self-tests
whenever any of the following events occur:
• Power-up
• Reset using the front panel Reset button (a hard reset)
• Reset via the NMS (a soft reset)
• Automatic reset in response to a non-recoverable failure
The power-up diagnostics test processors, memory, and other
critical hardware components of the ELS10-26. All diagnostic
software is stored in non-volatile memory.
5.1.1 Power-up LED Sequence
When you power-up the ELS10-26, the following occurs:
1. All LEDs turn on for one second.
2. The Power (Pwr) LED and all of the status LEDs remain on.
3. The CPU LED starts flashing.
4. All LEDs on ports 1 - 24 will go on in sequence and then go
out.