Grass Valley 8972PX User Manual
Page 17
8972PX — Instruction Manual
17
Configuration Summary
HD/SD Criteria
When the input signal is HD or SD SDI video, the signal health status is
based on the following criteria as analyzed 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 SMPTE compliant data
stream,
•
Valid Format – the input signal matches the selected input selection,
•
SMPTE Presence – no instability has been detected for a valid format,
and
•
No SMPTE TRS Errors – no TRS (Timing Reference Signal) errors have
been detected.
If any one of these criteria are incorrect for the input type selected, the
signal will be reported as
Not Good
. When this happens, the following cases
occur depending on the Switching Strategy Switch Mode selected in con-
figuration:
•
If the Switchback Strategy Switch Mode is set for
Maintain Primary
, the
module will switch the Program Output immediately to the Backup
Candidate. It will return the Primary input to the Program Output as
soon as the Primary input becomes good again in the time set with the
Switchback Delay control on the Output Control web page or with the
Newton Control Panel.
•
If the Switchback Strategy Switch Mode is set for
Maintain Stability
, when
the Primary input is detected as
Not Good
, the module will switch the
Program Output immediately to the next valid Backup Candidate and
remain there until the user decides to manually override the selection
to return the Primary input to the Program output or the Backup Can-
didate fails.
An optional criteria category to check for EDH/CRC errors can be enabled
by checking the EDH/CRC
Enable
checkbox.
The error detection process is done independently on each input channel
for both SMPTE 292M and SMPTE 259M. The error threshold (number and
total of fields allowed before the signal is considered not good) can be
selected with the controls provided.