Anritsu BERTWave MP2100B, Руководство по эксплуатации, Страница: 153 / 382

5.6 Setting Patterns
5-21
5
Generating Pulse Signal
PRBS
Pattern
Generation
Polynomial
Pattern
Length
Maximum
number of
contiguous 1s
Maximum
number of
contiguous 0
2^7–1 1+X
6
+X
7
127 7 6
2^9–1 1+X
5
+X
9
511 9 8
2^15–1 1+X
14
+X
15
32767 15 14
2^23–1 1+X
18
+X
23
8388607 23 22
2^31–1 1+X
28
+X
31
214748647 31 30
The ratio of 1s to the PRBS pattern length is 50%.
Programmable Pattern
The Programmable Pattern is the pattern defined by the pattern file.
The Programmable Pattern is used when the following patterns are
required:
 Frame format pattern such as Ethernet and SDH
 Pattern captured from communication circuit data
 Specified test pattern
The restrictions when using the Programmable Pattern are:
 The occurrence ratio of “1” is 50% with ±1bit tolerance.
 The pattern length is 1305600 bits or less. When the file data length is
over 1305600 bits, the first 1305600 bits are used.
 When using pattern files created for existing Anritsu products, use
Pattern A only when the pattern file type is Alternate.