EMC DS-16B manual Power-On, Diagnostics Post

Front Panel Diagnostics

7. Address assignment; after the master switch is identified, port addresses may be assigned. Each switch tries to keep the same

	addresses that were previously used. These are stored in the
	switch’s configuration flash PROM.
	8. Routing table construction; after addresses are assigned, the
	unicast routing tables are constructed.
	9. Enable normal port operation.
Power-On	The following table lists the diagnostic tests automatically run during
Diagnostics (POST)	POST. POST behaves differently depending on the boot method.
	A power cycle (power off & power on) is considered a cold boot. All
	other boots from a powered-on state (per reboot, panic, etc.) are
	considered warm boots.
	POST execution per cold boot executes the long version of ramTest.
	POST execution per warm boot executes a shorter version of ramTest.
	Boot time with POST varies depending on the boot method.
	A switch rebooted with POST disabled will generate the
	DIAG-POST_SKIPPED error log message.
	If a error is detected during POST, it is written to the system error log
	and is available for analysis via Telnet.
	If the error prohibits the switch from completing the boot process
	(fatal error), the switch stops the boot process and displays the error
	on the switch’s front panel display.
	If the error occurred in the POST processing before the switch is able
	to display the boot failure cause, the switch’s front panel power on
	indicator flashes (instead of its normal steady light) indicating the
	switch failed the boot process and is not operating.
	A switch boot failure indicates the switch must be taken offline to be repaired
	or replaced. Contact your service representative as described in Appendix B,
	Switch Support.

Status and Activity Indicators