SMD 989
– User Manual
Page 78 (105)
BAY 1: MODULATOR CONFIGURAT ↕
MODULATION PARAMETERS
MODULATION MODE: S2 SINGLE-CCM
>BISS CONGIGURATION
PRBS CONFIGURATION
CARRIER ID CONFIGURATION
BISS CONFIGURATION
↕
SCRAMBLING: ENABLED
>BISS MODE: MODE 1
SESSION WORD: ************
BAY 1: MODULATOR MODULATION ↕
SPECTRAL INVERSION
>ALPHA FILTER ROLLOFF: 0.3
SYNC BYTE DELETION: ENABLED
REDUCED LATENCY: DISABLED
Sync Byte Deletion: (Enabled/Disabled)
Description:
This selection permits removal of the incoming MPEG stream sync bytes from
reaching the modulator. This saves a bandwidth of 1 byte every 188 bytes. When set to Enabled,
the modulator blocks the incoming Sync Byte. When Enabled the receive demodulator must
reinsert it. When Disabled the modulator receives the full transport stream including the Sync
Bytes.
Reduced Latency
: (Only in Turbo PSK mode)
Reduced Latency Selections
-
Disabled:
(Default) No latency reduction -
with additional input buffering
-
Normal: Introduces slight latency without
additional input buffering
-
Reduced 1: Adds latency reduction to the Normal mode
-
Reduced 2: Adds latency reduction to the Reduced 1 mode
-
Reduced 3: Adds latency reduction to the Reduced 2 mode
-
Minimum: Adds latency reduction to the Reduced 3 mode
Description:
The reduced latency modes of the TurboPSK modulation provides several levels of
latency that can be applied. The reduced latency modes are only applicable to special low symbol
rate data satellite applications using the TurboPSK modulation.
Modulator Configuration- BISS Configuration
Configure BISS Scrambling (SMD 971 Option)
The BISS
Scrambling is configured by selecting the BISS tab in the
Configuration Modulator window. When BISS Scrambling is
enabled the entire transport stream will be scrambled. A
CA_descriptor will be added to the PMT and CAT tablle if
one does not exist. If a CAT table does exist it will be
altered.
Scrambling:
Set to Enable to scramble the Transport Stream. When disabled the transport
stream is not encrypted and therefore does not require a BISS key at the receiver.
Enable/
Disabled (Disabled is Default)
BISS Mode 1
: Allows the entry of an unencrypted twelve
(12) character hex session word.
BISS Mode E:
Allows the entry of an encrypted sixteen (16)
character hex session word along with a 14 character hex
and cannot be viewed from the front panel or any remote
interface.
Session Word
: Provides the entry field to specify the BISS mode 1 or mode e encryption key.