Instrument Function
R&S
®
SMBV100A
275
Operating Manual 1407.6062.32 ─ 08
For PRBS15 and PRBS23, a CCITT V.52-compliant data inversion is performed in the
feedback path automatically as shown below:
The pseudo-random sequence from a PRBS generator is uniquely defined by the register
number and the feedback. The following table describes the available PRBS generators:
Table 5-1: PRBS generators
PRBS generator
Length in bits
Feedback to
GUI selection
9-bit
2
9
-1 = 511
Registers 4, 0
PRBS 9
11-bit
2
11
-1 = 2047
Registers 2, 0
PRBS 11
16-bit
2
16
-1 = 65535
Registers 5, 3, 2, 0
PRBS 16
20-bit
2
20
-1 = 1048575
Registers 3, 0
PRBS 20
21-bit
2
21
-1 = 2097151
Registers 2, 0
PRBS 21
The "Data Source" selection for PRBS data from the dilaog is "PN11, ...".
Simple data patterns such as binary 0 strings or 1 strings can also be used as internal
modulation data. The "Data Source" selection from the menus is "ALL 0", "ALL1". A var-
iable bit string with a maximum length of 64 bits can be entered in an input field by
selecting "Pattern."
5.8.2.2
Internal Modulation Data from Lists
Internal modulation data can be generated and stored in the form of binary lists. A sep-
arate file is created for each list and held on the instrument's internal flash card.
The file name can be defined by the user.
The "Data Source" selection from the menus is "Data List". When this menu item is
chosen the "Select Data List" button appears; this opens the file-selection window for
data lists. A list can be created and edited in the "Data List Editor", which is accessed
from the menu via the "List Management" or "Data List Management" button.
The maximum length of a data list is determined by the size of the data list memory (see
data sheet). There is no restriction on the number of lists that can be stored.
Baseband Signal - Baseband Block
Summary of Contents for SMBV100A
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