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Diagnostics
Employ the following procedure to initiate tests using the terminal
interface:
1. If the test is one that involves cooperation with an operator at a re-
mote site, contact that person and make arrangements to perform
the test. Tests that must be initiated (and later terminated) at both
sites include end-to-end self tests, Line Loopbacks, and Payload
Loopbacks.
2. Select [2] DIAGNOSTICS from the terminal interface Main
Menu. The DSU responds by displaying the DeskTop T1 Diag-
nostics Selection screen, as shown in Figure 4-1.
3. Make any preliminary setups required for the test you intend to
perform. Two selections fall into this category:
[1] Select LL Mode must be set correctly if you are do-
ing a Network Line Loopback or a DTE Local Loopback.
When Unilateral is selected the function creates only one
loopback: incoming data back onto the T1 line in the case of
the network test, or transmit data back as receive data in the
case of the DTE test. When Bilateral is selected each test func-
tion loops data in both directions.
[9] Select DTE Self Test Pattern can be set to
2047 Pattern or 511 Pattern as needed for either of
the two functions that involve DTE Self Test. This is particu-
larly important when doing an end-to-end self test.
To change the setting of either of these
A. Type the selection number or letter of the option you in-
tend to change. Highlighting appears on the current set-
ting field for the corresponding option.
B. Use the left and right arrow keys to toggle the highlighted
field through its potential settings.
C. When the desired setting is displayed, press Enter.
4-5
GDC 048R154-000
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