Anritsu MP1763C - Manual (Page 41)

4-7
4.2.4 ZERO SUBSTITUTION
Select Z.S. with the keys.
Set the 2 N PATTERN with the keys. (This PRBS
is a pseudo PATTERN with a period of 2 N .)
Set the ZERO SUBSTITUTION BIT LENGTH.
The pattern of bit length logic ø set here is substituted.
See below for the substitution method.
Setting: 1 to 2 N -1 (N=7, 9, 11 or 15)
A pattern in which one logical bit is added immediately before the longest string of consecutive 1s of a 7, 9, 11, or 15-step
in a pseudo-PRBS (2 N bits: N=7, 9, 11 or 15) is substituted by an all-0s pattern. If the substituted bit is 0, this 0 is changed
to 1.
Example) In the case of a 7-step in a pseudo-PRBS
Since the longest string of continuous 0s is 7 - 1 = 6, the zero substitution starts at the next position.
1 0 0 0 0 0 0 1 0 0 0 0 0 1 1 0 0 0 0 1 0 1 0 .....
1 bit 1 0 0 0 0 0 0 0 1 0
5 bits 1 0 0 0 0 0 0 0 0 0 0 0 1 1
7 bits 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0
4.2 Generation Pattern Setting
Since the bit immediately after zero substitution is 0, it is changed to 1.
7-step in a pseudo-PRBS
DISPLAY
DATA LENGTH/ZERO SUBST LENGTH
DATA LENGTH
ZERO SUBST LENGTH A / B LOOP TIME
PAGE/ PATTERN SYNC POSITION