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C LO C K T E C H N O LO GY
C LO C K T E C H N O LO GY
C LO C K T E C H N O LO GY
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Sequence Synchronization
Sequence Synchronization (SEQSYNC) represents the default setting when
activating the REF1–3 menu page. It indicates the standard reference
synchronization function of iD. The timing of this process is aligned to the
parameter adjustments of the LONEREF (Lock Next Reference) and
LOCKTIME (Lock Time) functions (see GLOBAL 2/4 page).
REF 1
C
A = Timing interval of LONEREF function
B = Timing interval of LOCKTIME function
C = Switchover to next reference
Sequence Synchronization with three external references
Cycle Synchronization
With Cycle Synchronization (CYCLESYNC) iD supports an outstanding feature
for automated synchronization of different external clock sources.
REF 1
A
D
B
A = Timing interval of LONEREF function
B = Timing interval of LOCKTIME function
C = Timing interval of CYCLESYNC
D = Switchover to next reference
Cycle Synchronization with two external references, REF3 = NO REF
REF 1
A
D
B
A = Timing interval of LONEREF function
B = Timing interval of LOCKTIME function
C = Timing interval of CYCLESYNC
D = Switchover to next reference
Cycle Synchronization with three external references
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REF 2
REF 3
A
A
C
B
B
REF 2
REF 3
A
D
NO REF
skiped
B
C
REF 2
REF 3
A
D
A
B
B
C
Example
If the first source (REF1) has failed, the syn-
thesizer tries automatically to synchronize
the next source (REF2). When no reference
is available the system waits until the timing
interval of the LONEREF function (A) has
elapsed to synchronize the next reference. Is
INTERN
a clock source present, the synthesizer starts
to synchronize this under consideration of
the LOCKTIME timing interval (B). If this
reference also fails the system checks for the
C
B
third source (REF3) in same procedure.
Note!
If a reference slot is set to »NO REF« the sys-
tem skips this slot and synchronizes the next
activated slot or the internal video reference
generator.
The system will be locked as long as a clock
source is available at the respective refe-
rence slot. But after synchronizing the next
further reference it will not try to resynchro-
nize the previous one if this has returned. If
no utilizable signal is present on the three
slots, the synthesizer will synchronize the in-
ternal video reference generator as the final
clock source. After this a returned external
source will be not synchronized any more.
Example
If the first source (REF1) has failed, the syn-
thesizer tries to synchronize the next source
INTERN
(REF2) after passing the LONEREF timing
interval (A). When a second source is available
and synchronized finally (after passing the
LOCKTIME timing interval, B), the system will
start automatically querying REF1 for source
B
reestablishment in a five-minute interval.
If the system finds a utilizable source signal
within the defined LONEREF period, it will
resynchronize to the REF1 signal.
When no reference is available at REF2 the
system waits until the timing interval of the
LONEREF function (A) has elapsed and starts
to check REF3 for a clock source. If REF3 is set
to »NO REF« the system skips this reference
slot and synchronizes the internal video refe-
rence generator under consideration of the
LOCKTIME timing interval (B).
INTERN
Note!
Reference slots marked with »NO REF« will be
not recognized by CYCLESYNC.
D
B
As the clock source selected as REF1 has
always the highest priority for synthesizer
synchronization, the CYCLESYNC function
will always try to synchronize to REF1 first,
then to REF2, to REF3 and finally to the
internal video reference generator.
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