User manual

User Manual
Chapter 9. Decryptor Management
Page 9-4 P/N 2349-72712-01
Table 9-2: Decryptor Input dialog
PARAMETER VALUES
Source Type Selects the input source type of the Decryptor.
Available Options: ASI, QPSK
Tune
Frequency
Tune Frequency (kHz) Field
This field is used to enter the L-Band Frequency.
The signal received from the LNB to the CID must be in the CID input
frequency range (950 MHz to 2150 MHz). This frequency is the result of
down stepping the received satellite signal through the LNB.
Example:
Satellite frequency: 11,929 MHz
LNB frequency: 10,750 MHz
CID Input frequency = 11,929 MHz - 10,750 MHz = 1,179 MHz
Symbol Rate Symbol Rate (Baud) Field
The Symbol Rate for a group of station programs is configured
according to the broadcast program parameters.
The available Symbol Rate range is 1-45 Mbaud sec for QPSK.
NOTE
It is important to input the Symbol rate
accurately, including all the decimal places that
are given.
To calculate the Symbol Rate value for QPSK configuration when the
Bit Rate (BR) is given, use the following Equation:
[
*_Re*2
__
symbol
eViterbyRatSolomoned
BR
RateSymbolQPSK =
Where:
BR = Bit Rate [bit / sec]
Reed_Solomon = 188/204 in case of 188 packet length,
= 1 (204/204) in case of 204 packet length.
Viterby_Rate = 1/2, 2/3, 3/4, 4/5, 5/6, 6/7, 7/8, 8/9
Example
For bit rate of 39Mb/sec, Reed Solomon rate of 188 and Viterby rate of
3/4, the symbol rate is:
( )( )
212765.28
)4/3(*204188*2
39000000
__
MSymbol
RateSymbolQPSK ==