Specifications

7-10
Softkey Menu Descriptions
Pattern Softkey Menus
The controls listed below provide a means of generating predetermined error rates but
differing from the Error Add function because the errors are synchronized with the pattern
occurring at the same bit addresses in every instance of pattern “HALF B”.
The keys are only enabled when an alternate user pattern is selected. Refer to Alternate
Patterns within Chapter 8 User Patterns and Disk Operation for a procedure for selecting
alternate patterns.
When is selected, the source of control for Alternate
Patterns is the AUXILIARY INPUT port. When is
selected, the source of control is from the front-panel or over
GP-IB. Refer to Chapter 4 Operating Features and
Specifications for an explanation of AUX INPUT operation.
This controls how the alternate pattern is output; either each half
of the pattern is output alternately (controlled by
softkey) or a single insertion of a
number of instances of half B is inserted between repetitions of
half A.
This key is labelled this way only if is
set to . It selects whether the A or B half of the pattern is
output. It is blank if is set to .
This key is labelled this way only if is set
to . When pressed it causes the single insertion of a
number of instances of half B to be inserted between repetitions
of half A. The number of half B instances is equal to the smallest
integral multiple of the pattern length that divides exactly by
128. It is blank if is set to .
ALT PAT AUX USR AUX
USR
ALT PAT ALT ONCE
ALT PAT HALF AB
ALT PAT HALF AB ALT PAT ALT ONCE
ALT
ALT PAT AUX USR AUX
ALT PAT ONCE B ALT PAT ONCE B
ONCE
ALT PAT AUX USR AUX