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Features Descriptions M6100 Broadcast Satellite Modulator
12.8 PRBS Generator
Option number AS-01 is required to use this feature!
The PRBS (Pseudo Random Bit Sequence) generator is used to perform basic tests on the device
or to get an indication on the satellite link quality.
When using the PRBS generator check that the NIT Carrier ID and Rate Adapter are disabled. Note:
The randomness of the signal is not guaranteed when these settings are enabled.
PRBS can be activated on the following locations:
M6100> ASI Input >> Signal Selection
M6100> ASI Output >> Signal Selection
A warning message is raised when the PRBS generator functionality is already used
by another ASI interface. PRBS can only be active on one location in the device at a
time.
Both locations display the following parameters:
M6100 Boadcast Satellite Modulator> ASI Input >> PRBS Generator
And
M6100 Boadcast Satellite Modulator> ASI Output >> PRBS Generator
Parameter Description
TS Bit Rate Enter a TS Bit Rate in bps that must be generated.
Type Define what kind of test signal to use:
• PRBS: Configures the test generator to generate transport stream
packets containing PRBS data. The generated PRBS complies with
HP3764 Compatible 2^23-1 PRBS sequence as specified in CCITT Rec.
0.151.
• Counter: Configures the test generator to generate transport stream
packets containing 8-bit counter values as data. This counter data
cannot be analyzed by the test detector. It can only be used for manual
verification by an external analyzer.
PID Handling Configuration of the test generator to generate transport stream packets
with a valid transport stream header. The configured PID (Packet
Identifier) is inserted in the transport stream header and the continuity
counter is incrementing. Possible settings:
• Off: Transport stream packets are generated without a valid transport
stream header. In this case, a 0x47 sync marker followed by 187 test
bytes are generated.
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