TTC T-BERD 107A, Reference Manual

Page: 68 / 261

SECTION 3
3-29
INSTRUMENT
DESCRIPTION
During initial acquisition of the received signal, the
SUMMARY category should be displayed. The fol-
lowing messages can appear during signal acquisition:
ALL RESULTS OK
— Message appears when
all summary results are error-free or meet speci-
fication boundaries.
ALL RESULTS UNAVAILABLE
— Message
appears at a test restart when the instrument has
not synchronized with the received signal.
When an error is detected, the appropriate test result
appears in the RESULTS display. Refer to Section 5
Test Results for more information on the results that
appear in the SUMMARY category.
3.5 MAINFRAME
— TROUBLESHOOTING CONTROLS
During T1 circuit testing, it is often necessary to
determine the location of problems identified through
testing. This often involves gathering additional in-
formation by sectionalizing the T1 span to isolate the
problem. Figure 3-6 illustrates the following trouble-
shooting controls and indicators that are used to help
sectionalize the T1 circuit.
•
LOOP CODES switch 20
•
LOOP UP switch 21
•
LOOP DOWN switch 22
•
Pre-Existing Loop LED 23
•
ERR INS switch 24