22
DSU 5600 User Manual
61200.078L1-1
Chapter 3. Test Modes
Test Pattern (PTRN)
When the PTRN test is initiated, the local DSU 5600 uses the
integral test pattern generator to transmit a standard 2047 test
pattern to the DSU On the far end of the circuit. The local DSU
5600 then examines the received data for the standard 2047
pattern. Once this pattern is detected the,
Error
indicator is
turned
Off
. The
Error
indicator turns
On
when errors in the
receive data pattern are detected. While this test is active, errors
can be injected into the transmit data stream by pressing the
Select
push button.
To initiate the PTRN test, use the following steps:
1. Press the
Select
switch seven times to turn
On
the PTRN test
indicator.
2. Press the
Test
switch while this test indicator is
On
. The
PTRN LED
Flashes
during initialization of the test and turns
On
solid once the test is in progress.
To terminate this test, press the
Test
switch.
