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Advantech L-Band Satellite Modulator Especificaciones Pagina 38

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Front Panel Monitoring & Control
Menu Item Operations
-> Data Rate: [199000000 BPS]
Input :
This entry does not appear in ACM mode. This allows the selection of the source of
the input. The options are OFF, ASI1, ASI2, ASI3, ASI4, PRBS. The number of ASI
is dependant upon unit configuration.
Redundant Input
:
This entry does not appear in ACM mode. This allows the selection of the source of
the input. The options are OFF, ASI1, ASI2, ASI3, ASI4, PRBS. The number of ASI
is dependant upon unit configuration.
Input Type :
This is the method of locking to the incoming data.
VBR
Variable bit rate mode will add Mpeg Null
packets to guarantee a fixed symbol rate.
The data rate has to be set to SPS, not BPS.
The PCR values are re-stamped to meet the
PCR jitter requirements. The reset on error
tick box is only valid in this mode. If this box is
ticked and the input is removed then the
output will be disabled - otherwise null
packets are transmitted continuously.
204 byte Mpeg packets are automatically
accepted and converted to 188 byte
packets, the bit rate assumes the transmission
of 188 byte packets.
Normal
The transmitted carrier is frequency locked to
the input data rate. The data rate can be set
as BPS or SPS and the calculation is
performed. This operation acts as a seed and
the actual symbol rate is reported in the
status window. The data stream is not
modified. In DVB-S2 the data will be
transmitted as Transport streams and sync
detection is performed.
The VBR on Error tick box will only appear in
this mode, when the input is removed and
the box ticked then Null packets will be
transmitted until the signal is replaced.
204 byte Mpeg packets are automatically
accepted and converted to 188 byte
packets, the bit rate assumes the transmission
of 188 byte packets.
Unframmed
In DVB-S mode the data is required to be in a
MPEG transport stream format i.e. a 0x47
Sync mark every 188 bytes. In Unframed
mode a sync mark is inserted which needs to
3-8 SBM75e Series Modulator Installation and Operation Manual
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