User manual

T1 Modem Bank
62
Diagnostic Test Descriptions
Test 1: Front Panel Test
This test activates the ten LED indicators and the two 7-segment displays in four different patterns at 1-second
intervals: the first pattern lights the RD, CTS, DCD, RI and IFC LEDs plus the horizontal elements of both 7-
segment displays and the decimal point of the second 7-segment display; the second pattern lights all LEDs and
display segments; the third pattern lights the TD, RTS, DSR, DTR and OFC LEDs plus the vertical elements of both
7-segment displays and the decimal point of the first 7-segment display; the fourth pattern turns all LEDs and 7-
segment displays off. The cycle then repeats. Since the indicators are write only, the operator must visually verify
success (or failure) of this test.
To begin the test in front panel mode, press the left push-button while the number
1
is displayed in the 7-segment
LED display. While the test is running, the 7-segment display shows the pass count. The test will be repeated until
the left push-button is pressed. At this point,
P1
will be displayed. Press the left push-button again to restart the test
or the right push-button to advance to Test 2.
When run from a terminal, the test repeats until a key is pressed.
T
est 2: RAM Test
The RAM test performs various walking bit and high bit tests.
RAM tests intermix cached & uncached RAM accesses.
To begin the test in front panel mode, press the left push-button while the number
2
is displayed in the 7-segment
LED display. While the test is running, the 7-segment display shows the pass count. Errors are counted on the ten
LEDs, and the test is repeated until the left push-button is pressed. At this point, either
P2
(pass) or
F2
(fail) will be
displayed. Press the left push-button again to restart the test or the right push-button to advance to Test 3.
When run from a terminal, the test repeats until a key is pressed.
One complete cycle of this test takes about 9 minutes.
Test 3: Timer Test
The timer test runs the internal timer and verifies that the timer can interrupt the CPU.
To begin the test in front panel mode, press the left push-button while the number
3
is displayed in the 7-segment
LED display.
When run from the front panel, the pass number is shown on the 7-segment display. Errors are counted on the ten
LEDs, and the test is repeated until the left push-button is pressed. The 7-segment display will then show
P3
or
F3
to
indicate pass or fail status.
When run from a terminal, the test repeats until a key is pressed.