DVBS2 - COFDM
16
that occupies the service indicated. The second
number indicates the percentage of the output
that is free. In the example, France 2 will occupy
18% of the output (it is OFF so it is removed) and
there is 25% of free space. It is easy to see that,
in principle, this service could be activated (ON
or DCY) because there is still suffi
cient capacity
to output. The free percentage to output is only
updated once the confi guration of the services has
been recorded.
Additionally, the status (scrambled or clear) of the
service, both at the input and output are indicated
in the upper right hand corner:
Scrambled service at input.
f. Measurements menu 1
The following menu provides an indication of the
input
signal quality
using an estimate of C/N (dB)
and the link margin (dB).
MONITOR >>
C/N:14.1dB
L.M.: 7.7dB
g. Measurements menu 2
This menu indicates the
occupancy rate
of the
module’s output as well as the maximum achieved.
If too many services are selected it will result in an
output overfl ow and this condition is indicated.
MONITOR
Occupancy:
76%
Max:80%
MONITOR
Overflow!!
Occupancy values higher than 82% are not
recommended.
If the occupation exceeds 82%, we recommend
trying to reduce it, either by changing the guard
interval, the modulation or the FEC.
If despite this, the modulation is still over 82%, the
only option to reduce it would be to eliminate a
service of the output multiplex. See paragraph 6.
This is a read only menu, which disables the keys
and .
You can reset the maximum occupation by
pressing the key .
5.2. Extended menu
When the key is held down for more than 3
seconds the unit shows a series of less frequently
used menus called
extended menus
.
a. Confi guration menu
This menu enables the
address
of the unit to be
selected (to be controlled through a CDC Headend
Control).
It also allows selection of the
output frequency
diff erence
(125 or 166KHz), the
table of channels
to use or
frequency mode
operation.
CONFIG.
CDC Adr: 001
Step: 166KHz
CCIR N.Z.Ind
The channel tables that can be selected are:
•
CCIR,
•
China
•
Chile
•
Italy
•
France
• OIR channels
•
Ireland
• South Africa
•
Poland
•
Australia
Summary of Contents for DVB-S2 COFDM
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