SDI-TD-DMUX-4
Rev.
5
2.
If, at any time, the lock is lost on the presently selected input, after a one second
delay, the board will first check if there is a carrier on the other input. If it isn’t, the
input select will remain unchanged. If there is a carrier on the other input, the board
will swap to that input and try to lock to it.
3.
If both inputs have a carrier, but the board is incapable of locking to any of the
signals, the board will toggle between the two inputs until a lockable signal is applied
to either of the two inputs. Then, this input will be selected. The toggling rate is
about once per second while searching for a lockable signal.
4.
If none of the inputs has a carrier, the board will remain at its present input selection
(the last one it successfully locked to or tried to lock to).
5.
If there is a carrier on only one of the inputs, only this input will be selected as long as
this is the case (no toggling).
6.
There will always be a one second delay before giving up the presently selected signal
on loss of lock.
7.
There will be no non-volatile memory for keeping the last selected input when in
auto mode. The above algorithm will always start working to find a signal when
starting the board. This means that, after power-on, the optical input will always win
if there is a lockable signal present at that input.
Other board settings available from GYDA-SC:
Control item
GYDA-SC mode
DIP = ‘-------0’
Non-GYDA-SC mode
DIP = ‘-------1’
Input select
GYDA-SC can select ‘electrical’, ‘optical’ or
‘auto’ modus. In ‘auto’ modus, the optical
input has priority over the electrical input.
Input select according to
DIP-switches. See above
table.
EDH counters
Under GYDA-SC control (can be read and
reset from GYDA-SC).
Counting still active on the
MUX board (on errors), but
without any functional
significance.
EDH flags
Can be read from GYDA-SC.
Flags still operating on
board, but without any
functional significance.
EDH masks
Can be changed from GYDA-SC. Not
stored in non-volatile memory, so power
on default is ‘all active’, until GYDA-SC
configures otherwise.
EDH masks remains
unchanged from last setting.
Default on power on is all
active.
Channel swap
Can be controlled by GYDA-SC, all options
available.
In addition, GYDA-SC can select internal
signal generators for test and debug
purposes. Colour bar 525, colour bar 625,
black 525 or black 625 can be selected for
each SD-SDI output.
Channel swap/distribution
according to DIP-switches.
See above table.
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