Appendix C
Test Patterns and Loop Codes
Test patterns
194
CT-650 Command-Line Reference Guide
Release 9.4
X
X
LUP IBM80
a
Fixed 24-octet test pattern. Refer to
specific test pattern sequence.
X
X
LUP
MIN_MAX
Fixed 72-octet minimum/maximum density pattern used to stress
repeater pre-amplification, equalization, and ALBO circuitry. The
pattern generates rapid transitions from low ones density octets
to high ones density octets. When frame aligned, pattern meets
maximum zeros and ones density criteria. Refer to
for specific test pattern sequence.
X
X
X
LUP Prog
<patname>
Select programmable long user pattern. The pattern is defined in
hexadecimal format with the Supervisor Menu
LUP
command.
X
X
LUP T1_2
Fixed framed or unframed 96-octet pattern. Pattern consists of a
long series of high ones density octets followed by quick
changes from average ones density to low ones density octets.
When frame aligned, pattern provides a maximum of 15 zeros
and meets the ones density criteria. Refer to
for specific test pattern sequence.
DS1 Rate — Pattern causes false frame synchronization on
SLC-96-type framed circuits.
DS3 Rate — Used to stress M12 circuits in DS3 equipment.
X
X
LUP T1_3
Fixed 54-octet pattern. Used to stress T1 repeater pre-amplifica-
tion, equalization, and automatic line build-out (ALBO) circuitry.
Pattern consists of rapid transitions from low ones density octets
to high ones density octets. When frame aligned, pattern
exceeds the maximum zeros criteria and ones density criteria.
Transmit pattern over repeatered span only and not the network.
Refer to
for specific test pattern sequence.
X
X
LUP T1_4
Fixed 120-octet pattern. Used to stress equalization circuits
between T1 multiplexers. Pattern similar to the T1-2 pattern and
consists of rapid changes from high ones density to minimum
ones density octets. When frame aligned, pattern contains a
maximum of eight zeros and meets the ones density criteria.
Refer to
for specific test pattern sequence.
Table 12
Digital test patterns (Continued)
DS3
DS1
FT1
DD
S
Pattern
Description
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