Table of Contents
Advertisement
SELF TEST
61200.078L1-1
In addition to a self test mode, other DSU 5600 test modes allow
the user to isolate problems to specific components of the
communications circuit. These various test modes for the DSU
5600 are initiated and terminated from the front panel using
Select and Test.
When the DSU 5600 is powered on, all LEDs on the front panel
turn On simultaneously for approximately two seconds then
turn Off briefly. The LEDs then cycle On in pairs with a fan-out
pattern away from the ALM indicator. Next, the LEDs cycle Off
in pairs with a fan-in pattern back towards the ALM indicator.
These patterns are repeated four times to determine that all
LEDs are functioning properly.
At completion of the LED test patterns the PTRN LED is On,
indicating the DTE with TP test is being performed. This test is
successful if the Error indicator does not turn On. If the DTE
with TP test fails, the RS, ALM, DTE, PTRN, and Error indica-
tors all Flash.
If an EPROM CHECKSUM failure is detected during self test,
CS, ALM, PTRN, and Error indicators Flash at the end of the self
test.
DSU 5600 User Manual
Chapter 3. Test Modes
Chapter 3
Test Modes
1 3
Advertisement
Table of Contents
