Norsat International Inc. NSLK3200 用户手册
Page 44
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FIGURE 36.
T
RANSMISSION
P
ROFILE
:
T
RANSPORT
S
TREAM
Setup Panel.
Create the
T
RANSPORT
S
TREAM
1.
Enter a
D
ESCRIPTION
for the transport stream; maximum length of 50 char-
acters.
N
OTE
While duplicate profile descriptions are allowed, to allow for easier identifica-
tion it is suggested that each profile is given a unique description.
tion it is suggested that each profile is given a unique description.
2.
Enter a value for the
S
YMBOL
R
ATE
between 2,000,000 and 8,000,000.
3.
Select an
FEC I
NNER
C
ONV
. C
ODE
R
ATE
from the drop-down box.
N
OTE
The
D
ATA
R
ATE
, i.e. the maximum allowable bitrate, will automatically be cal-
culated in accordance with the following formula:
In other words, the
D
ATA
R
ATE
is equal to the
S
YMBOL
R
ATE
, multiplied by:
•
2
: QPSK modulation is 2 bits per symbol
•
FEC
: the fraction actual data (i.e. does not include error bits)
•
188/204
: the fraction of actual bits to total bits in Reed Solomon coding
N
OTE
The sum of the bitrates for the video PID, audio 1 PID and audio 2 PID must
be less than or equal to the
be less than or equal to the
D
ATA
R
ATE
.
N
OTE
The actual video PID bitrate by be adjusted down slightly to accommodate the
transport overhead.
transport overhead.
4.
Next click on the
V
IDEO
tab; refer to Figure 37 on page 45.
D
ATA
R
ATE
S
YMBOL
R
ATE
2
×
FEC
×
188
204
204
---------
×
=