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Initialization
At power up, the boot loader software executes first. It performs a test of RAM
Sequence
and then relocates itself for further execution from there. During boot-up, the
following screens appear in sequence on the LCD:
Following normal boot-up, the "home" screen will appear as described in sec-
tion 3.4 Front-panel Operation on page 29 and the LEDs reflect the actual
state of the unit.
Initialization
When in Initialization Failure mode, the unit is essentially dead. There is no
Failure
ASI output, the alarm relay is de-energized (alarm state), the alarm LED is ON,
and the unit does not attempt acquisition of input streams. Call Wegener Cus-
tomer Service.
3.6 Transport Stream Processing
Refer to ISO 13818-1 for supporting details on the structure of MPEG Trans-
port Streams.
Input to
The basic DTV720 has two ASI inputs (and optionally two RF inputs or two
Output
more ASI inputs). Program data from these inputs are multiplexed and output
Processing
on two duplicate ASI outputs. The unit processes the input, selects programs
based on user input, and provides an output signal on the ASI outputs (and
optional DHEI output). The processing includes program number changes as
selected. Based on user selection, certain programs may be selected and then
passed to the ASI output with time stamping updated.
PSIP
Within the transport stream there are PIDs carrying tabular information on that
Structure and
stream. The PAT describes all the programs available. The program number
Program
identifies each program in the transport stream. When a source of data is
Selection
acquired, the stream is passed to the internal transport demultiplexer. This cir-
cuit then extracts the PAT and PMT information and provides this information
to the user via the Stream Info and Configuration pages of the web interface.
800043-01 Rev. B
FPCon
Hit key to stop boot
Booting in 2
Booting System
Bootloader Ver 101
Done Booting
Bootloader Ver 101
36
DTV 720 User's Manual
All front-panel LEDs light are
v001
OFF during boot process.
wegener.com
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