Dte With Test Pattern (Tp) - ADTRAN DSU 5600 User Manual

Chapter 3. Test Modes

DTE with Test Pattern (TP)

1 6
The DTE with Test Pattern (TP) test is similar to the DTE Only
test described previously. The DTE with TP test is initiated at
the local DSU 5600 and is used to independently test the opera-
tion of the DSU 5600.
To initiate the DTE with TP test, perform the following steps:
1. Press Select twice to turn On both the DTE and PTRN test
indicators.
2. Press Test while these test indicators are On.
To terminate this test, press Test.
Instead of using data from the terminal or test equipment, this
test utilizes an internal test pattern generator and detector built
into the DSU 5600. The loopback point and the data paths for
this test are illustrated in Figure 3-2.
The internal test pattern generator and detector of the DSU 5600
operate with a 2047 data pattern. When this test is initiated, the
test pattern detector examines the receive data stream until
synchronization to the 2047 pattern is achieved. Once synchro-
nized, the detector continues to check the receive data and
reports any bit errors detected by turning On the Error LED.
Once a test is initialized with the internal test pattern generator
and detector, errors can be injected into the transmit data stream
by pressing Select and observed by watching the Error LED turn
On for a brief period of time.
As previously mentioned, the DTE with TP test is automatically
performed during the self test sequence for the DSU 5600.
DSU 5600 User Manual 61200.078L1-1