Built-In Self Test (Bist); Overview; Startup Execution Of Bist - Nokia ESB26 User Manual

35. Built-In Self Test (BIST)

Overview

The Built-in Self Test (BIST) performs a set of basic tests of switch hardware and of its
configuration validity.
Startup BIST - The BIST is performed automatically on startup. The results are summarized
on the terminal before the switch banner.
BIST by request - At any time a user may request BIST execution, by using a CLI command.
The current BIST status may be read and cleared by using CLI commands.
When the BIST detects a failure in any of the tests, it causes the Status LED indicator to
blink.
Table 35-1 summarizes the BIST tests for the ESB26 switch.
Table 35-1 Description of the Built-in Tests
T e s t
CPU Notify RAM
Test
CPU Interface Test
Data Buffer Test
NOTES 1. To display BIST failure results, use the show self-test command in Privileged mode.
2. To display all BIST results, use the show self-test full command in Privileged mode.
3. To invoke a BIST by Request at any time the switch is running, use the self-test
command in Privileged mode.

Startup Execution of BIST

When the power is turned on, the switch executes a startup BIST. The switch reports a
summary of the results on the terminal. The results are either Passed or Failed, as in the
following report is example:
MN700004 Rev 01
D e s c r i p t i o n
On boot, the entire DRAM is tested. This test is run once at startup.
Checks the existence of the UART (register write/read operation).
Only COM1 is checked.
Checks the integrity of NVRAM database.
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