TTC T-BERD 107A, Reference Manual

Page: 96 / 261

SECTION 3
3-57
INSTRUMENT
DESCRIPTION
AUX LOOPCODE — When FT1 modes are
selected, the T-BERD 107A sends in-band
loop codes within the selected FT1 channel
bandwidth. However, the T-BERD 107A does
not respond to FT1 in-band loop codes. Out-
of-band loop codes are not affected by the FT1
Option.
PATTERN Switch
When an FT1 mode is enabled, the following stress
patterns are available:
63 — A 63-bit (2
6
-1) pseudorandom pattern that
generates a maximum of five sequential zeros
and six sequential ones.
511 — A 511-bit (2
9
-1) pseudorandom pattern
that generates a maximum of eight sequential
zeros and nine sequential ones. This pattern is
generally used to test DDS and other circuits
operating below 9.6 kb/s.
2047 — A 2047-bit (2
11
-1) pseudorandom pat-
tern that generates a maximum of ten sequential
zeros and eleven sequential ones. This pattern is
generally used to test DDS and other circuits
operating between 9.6 and 56 kb/s.
<tone> — The tone frequency selected in the
AUX VF TONE function is displayed as a
pattern selection. The selection is either 404 Hz,
1004 Hz, 2713 Hz, or 2804 Hz.