Technical information

Cuda 12000 IP Access Switch CudaView Administration Guide
Configuring Modulation Profiles 537
What You See
Figure 18-24 Modulation Profile - Add Window
Parameter Descriptions
This table provides a description of the Modulation Profile - Add window
Table 18-23 Modulation Profile Configuration Parameters.
Parameter Description
Modulation
Ty pe
Sets the modulation type for an upstream port. Choose a
value from the pull-down menu. Acceptable values are QPSK
and QAM16.
Preamble
Length
Specify the preamble pattern length from 2 to 448 bits.
Differential
Encoding
Differential Encoding should be enabled when FEC is not
used and disabled when FEC is used.
FEC Error
Correction
Specify the number of errored bytes that can be corrected ‘in
forward error correction code. By default, FEC Error
Correction is set at zero. The value of zero indicates no
correction is employed. Acceptable values are 0 to 10. The
number of check bytes appended will be twice the value that
is set.
Codeword
Length
Number of data bytes (k) in the forward error correction
codeword. Acceptable values are 1 to 255.
Note: This parameter is not used if FEC Error Correction is
zero.
Scrambler Seed 15 bit seed value for the scrambler polynomial. By default,
Scrambler Seed is set to 338.