GUIDE TO INSTALLATION AND OPERATION
6
| HCO-3901
The HCO-3901 provides up to eight 3G/HD/SD SDI video outputs (depending on the rear panel in use), labeled
PGM
(program)
and
PVW1, PVW2
and
PVW3
(preview). The SDI video signals conform to the SMPTE 292M, SMPTE
259M-C and SMPTE 425M standards.
DVB-ASI per EN 50083-9 is also supported.
Note: The phase-inverted outputs on the –EX rear panel (indicated by
white lettering in a black circle) are not suitable for DVB-ASI distribution.
REF IN – Studio reference input
For external synchronization, connect a black studio reference signal to the BNC labeled
REF IN
.
NB: The REF IN
loop-through, when provided, must be terminated if not used.
GPI connector (3DRP rears only)
The double-width rear panels of the HCO-3901 include a GPI interface that allows control of the switch process.
When constructing and using an external GPI box, be aware of the following:
1.
The HCO-3901 card monitors the external power supply voltage on the GPI input. If the voltage is less than
approximately 4V, an alarm will be raised.
2.
GPI IN 1 and GPI IN 2 should NOT be activated at the same time – DAMAGE TO THE RELAY MAY RESULT.
3.
GPI inputs trigger on a momentary pulse. To be recognized without ambiguity, a GPI trigger pulse should have a
duration of at least 40 ms.
The reference input must conform to SMPTE
170M/SMPTE 318M/ITU 624-4/BUT 470-6 for
standard definition signals and SMPTE 274M /
SMPTE 296M for high definition signals and is used to
phase the HD/SD SDI outputs to the studio. A
reference mismatch may occur if there is a difference
between the input video format’s frame rate and the
reference format’s frame rate. When a mismatch
occurs, an input error will be flagged and the card-
edge Status LED will turn red to indicate the
mismatch. The table shows the supported reference
signals with respect to the input signals:
Supported input signals
Reference
525 (SMPTE-259M-C)
NTSC (SMPTE-170M)
625 (SMPTE-259M-C)
PAL (ITU 624-4)
1080i50 (SMPTE-274M)
1080i50, PAL
1080i59.94 (SMPTE-274M)
1080i59.94, NTSC
720p50 (SMPTE-296M)
720p50, PAL
720p59.94 (SMPTE-296M)
720p59.94, NTSC
3G Lvl A 50/60
NTSC, PAL
ASI (EN50083-9)
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Figure 2-2 GPI input trigger pulse timing
