Specifications

7-5
Softkey Menu Descriptions
Pattern Softkey Menus
NOTE If you select a user pattern ensure that the sync threshold is compatible
with the pattern being generated. Failure to set the correct sync
threshold may result in incorrect synchronization. Incorrect
synchronization results in errors and may cause clock-to-data
alignment failure.
,
Select from one of four modified Pseudo-Random Binary
Sequences which have an extra zero added to the longest run
of zeros, and with a modified Mark Density.
Enables the user to set the total length of the longest run of
zeros. The longest run can be extended to the pattern length,
minus 1. The bit after the substituted zeros is set to 1. This
key is only enabled when a ZEROSUB pattern is selected.
Enables the user to set the value of the mark density by
selecting a value from the choices given. These represent the
ratio of marks to the number of bits in the pattern.
Returns the user to the main (pattern) menu.
,
The choice of patterns are four RAM-based patterns
(numbers 1 to 4) of length up to 8192 bits and the
CURRENT PATTERN.
Use this key to switch between a display listing RAM user or
disk based patterns.
,
Select one of eight floppy disk based patterns (numbers 5
to 12) and the CURRENT PATTERN.
Use this key to switch between a display listing RAM user or
disk based patterns.
pattern
mark density
2^13 MARKDEN
2^11 MARKDEN
2^10 MARKDEN
2^7 MARKDEN
LONGEST RUNZERO
1/8, 1/4, 1/2
3/4, 7/8
exit
pattern
ram Usr pattern
ram Usr pattern
toggle disk usr
pattern
diskUsr pattern
diskUsr pattern
toggle ram Usr