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HDMA 784 C ASI
Example:
Output symbol rate SR (A) 64-QAM, FEC=
3
/
4
,
Input symbol rate SR (E) = 27,500 kSymb/s
SR (A)
=
3
/
4
x
1
/
3
x 27,500 kSymb/s =
6,875 kSymb/s
—>
If no "FEC" is stated in the station lists, it can be assumed to be
"FEC =
3
/
4
".
t
r ansponder
with
a
very
low
symbol
r ate
(sCpC
station
)
The extremely low data rate means that the output symbol rate is very low. If
there are reception problems with different digital receivers, set output symbol
rate to a higher value.
d
efined
symbol
r ates
Some cable operators specify a fixed symbol rate (e.g. 6,900 kSymb/s).
3
i
nstallation
– Ensure the head-end station is mounted so it will not be able to vibrate.
Avoid, for example, mounting the head-end station onto a lift shaft or any
other wall or floor construction that vibrates in a similar way.
– Before installing or changing a module, switch off the head-end station or
unplug the power cable from the mains power socket.
– Take measures to protect against ESD!
• Open the housing of the head-end station in accordance with the assembly
instructions for the STC 160.
