Grass Valley 8972PX User Manual
Page 18
18
8972PX — Instruction Manual
Configuration Summary
DVB ASI Criteria
When the input signal is DVB ASI, the signal health status is based on the
criteria described below as determined by the module. These criteria are
always enabled and the module will determine module health by checking
each item below.
The signal is considered
Good
when:
•
Carrier Detect – a valid carrier is detected on the input,
•
Serial Lock – the serial receiver is locked to a DVB ASI compliant data
stream,
•
Valid Format – the input signal matches the selected input selection,
and
•
MPEG2 TS Lock – the input signal is locked to the synchronization byte
of the MPEG packets.
If any one of the criteria are incorrect for the input type selected, the signal
will be reported as
Not Good
. Switchback Strategy Switch Mode selection is
the same as the HD/SD SDI video signals explained in
On each input link, the bit rate of packets is evaluated on up to 4 user-
defined PIDs (the minimum bit rate detected is one packet per second or
1.5 kbps). A PID is seen as not present as soon as there is no packet within
one second. It is recommended to choose PIDs whose bit rate is at least 4.5
kbps to avoid an unexpected switch of the input if packets are not evenly
spaced on the transport stream. Primary and Secondary inputs share the
same PIDs. The Alternate input can have 4 independent dedicated PIDs.
For setting the PIDs, see
DVB/ASI Criteria Web Page on page 60
. Presence
and Continuity Error reporting criteria can also be enabled as desired for
each PID stream.