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Chapter 5
Power-On Self Test
A Power-On Self Test (POST) sequence takes place when the TE-
100/S14 Switch is first turned on (cold boot). Software reset
(warm boot) through the RS-232 port is not supported to prevent
unauthorized remote re-boot.
The POST sequence checks the system integrity by performing
the following component tests:
−
System boot
−
RAM test
−
Timer and interrupt controller tests
−
Cache controller test
−
RS-232 diagnostic port test
−
BIOS test
−
EEPROM checksum test
−
Program load checksum test
−
Ethernet ports test
Besides the Power On/Off LED, there are eight System LED
lights used to display the results of these tests during the POST
sequence. The LED status lights further display test results in two
categories, the System component test status, and the LAN port
test status. Any error that arises from the System component tests
means that the Switch failed to function. Any LAN port error(s)
indicates that, although the displayed LAN port(s) is not
functioning, the TE-100/S14 Switch is operational with the
remaining LAN ports.
The following two sections describe the meaning of the LED
status lights (See Appendix A, Page 35).
Diagnostics
33
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