Adtran DSU 56 Manual Do Utilizador
Chapter 3. Test Modes
3-8
DSU 56/64 User Manual
61200062L1-1
Test Pattern (PTRN)
When the
PTRN
test is initiated, the local DSU 56/64 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 56/
64 then examines the received data for the standard 2047 pattern.
Once this pattern is detected and synchronization is achieved, the
pattern to the DSU on the far end of the circuit. The local DSU 56/
64 then examines the received data for the standard 2047 pattern.
Once this pattern is detected and synchronization is achieved, the
E
RROR
indicator is turned off. The
E
RROR
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
active, errors can be injected into the transmit data stream by
pressing the
S
ELECT
push-button. The
PTRN LED
flashes during
initialization of the test and turns on solid once the test is in
progress.
progress.
To initiate the
PTRN
test, perform the following steps:
1. Press
S
ELECT
seven times to turn on the
PTRN
test indicator.
2. Press
the
T
EST
switch while this test indicator is on.
3. To terminate this test, press
T
EST
.