TTC T-BERD 107A, Reference Manual

Page: 52 / 261

SECTION 3
3-13
INSTRUMENT
DESCRIPTION
MULTIPAT — The MULTIPAT pattern con-
sists of five commonly used test patterns that
allow the T-BERD 107A to test a T1 span
without having to select each test pattern indi-
vidually. The T-BERD 107A monitors the re-
ceived test patterns for bit errors, BPVs, and
frame errors.
When MULTIPAT is selected, the five test
patterns are transmitted for a user-determined
duration in the order that they appear in Table
3-2. An auxiliary function is used to individually
set the duration for each test pattern (see Section
4 Auxiliary Functions for more information).
As the patterns are transmitted, the word
MULTIPAT alternates with the name of the test
pattern being transmitted. The test patterns are
identified in the PATTERN display in lower-
case letters (e.g., ALL ONES = all ones).
Table 3-2
MULTIPAT Patterns
Pattern Name Bit Pattern (F = Framing bit)
ALL ONES F 1111
1:7 F 0100 0000
2 IN 8 F 0100 0010
3 IN 24 F 0100 0100 0000 0000 0000
0100
T1-QRSS 2
20
-1 pseudorandom pattern
with 14-zero suppression