Atec gigaBERT1400, User Manual

Page: 178 / 376

BERT Primer
B-4 GB1400 User Manual
The Tektronix PB200 provides capabilities to invert data on both transmit and
receive. This provides full flexibility to adjust the PRBS signal to the user's
exact requirements. Table B-1 identifies the PB200 polynomial and shift register
feedback taps used to generate PRBS data.
Table B-1 - PRBS Polynomials and shift register feedback taps for PB200
N Menu Label PRBS
Pattern Primitive
Polynomial
Feedback Taps Length in bits
(2
N
-1 bits)
7 PN 7 2
7
-1 x
7
+ x + 1 6 and 7 127
9 PN 9 2
9
-1 x
9
+ x
4
+ 1 5 and 9 511
10 PN 10 2
10
-1 x
10
+ x
3
+ 1 7 and 10 1023
11 PN 11 2
11
-1 x
11
+ x
2
+ 1 9 and 11 2047
15 PN 15 2
15
-1 x
15
+ x + 1 14 and 15 32,767
23 PN 23 2
23
-1 x
23
+ x
5
+ 1 18 and 23 8,388,607
31 PN 31 2
31
-1 x
31
+ x
3
+ 1 28 and 31 2,147,483,647
The Tektronix GB700/1400 provides capabilities to invert data on both transmit
and receive. This provides full flexibility to adjust the PRBS signal to the user's
exact requirements. Table B-2 identifies the GB700/1400 polynomial and shift
register feedback taps used to generate PRBS data.
Table B-2 - PRBS Polynomials and shift register feedback taps for
GB700/GB1400
N Menu Label PRBS
Pattern Primitive
Polynomial
Feedback Taps Length in bits
(2
N
-1 bits)
7 PN 7 2
7
-1 x
7
+ x + 1 6 and 7 127
15 PN 15 2
15
-1 x
15
+ x + 1 14 and 15 32,767
17 PN 17 2
17
-1 x
17
+ x
3
+ 1 14 and 17 131,071
20 PN 20 2
20
-1 X
20
+ x
3
+ 1 17 and 20 1,048,575
23 PN 23 2
23
-1 x
23
+ x
5
+ 1 18 and 23 8,388,607