4-4
Diagnostics
GDC 048R154-000
Tests can be used at the time of installation or whenever operation of
the DSU must be checked. You can also use these tests as an aid in
isolating problems in the data communications system (refer to Figure
4-1, Fault-Isolation Procedure).
Terminal Interface Test Procedure
All tests that you perform by means of the terminal interface involve
the same basic procedure, which is described below. Descriptions of
the individual tests appear on the following pages.
Figure 4-2
Diagnostics Selection Screen
DT T1 Diagnostics
[0] Return to Main Menu
[1] Select LL Mode:
Unilateral
1
[2] Start Network QRSS Self Test
[3] Start Network Payload Loopback
[4] Start Network Line Loopback
[5] Start Network Local Test
[6] Start Network Local Test with QRSS Self Test
[7] Start Network Remote Test
[8] Start Network Remote Test with QRSS Self Test
[9] Select DTE Self Test Pattern:
2047 Pattern
2
[A] Start DTE Self Test
[B] Start DTE Local Loopback
[C] Start DTE Digital Loopback
[D] Start DTE Remote Digital Loopback
[E] Start DTE Remote Digital Loopback with Self Test
Next Selection:
1
or Bilateral
2
or 511 Pattern
