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1. Introduction
The VDA-108-3GS receives one SDI input, perfectly duplicates it, and re-transmits eight SDI outputs
for real time multi-viewing. It is a reliable video device splitting a SDI, HD-SDI, or 3G-SDI video
source to eight SDI compliant displays at the same time. Besides, built-in re-clocking & equalization
features provide the best performance for SDI distribution amplifier.
2. Features
• 3G/HD/SD triple-rate distribution
• Eight separately buffered and re-clocked outputs
• Supported SDI format
»
3G-SDI (SMPTE 424M, 425M level A, B up to 2.97 Gbps)
»
HD-SDI (SMPTE 292M, 296M up to 1.485 Gbps)
»
SD-SDI (SMPTE 259M, up to 270 Mbps)
• Cable equalization (Belden 1694A) and signal retiming
• Video bandwidth: 2.97Gbps, 2.97/1.001Gbps
• Automatic detection of 3G/HD/SD-SDI signals
• Dual color LED indication of input lock and rate
• Passes all ancillary data
• Provides automatic cable equalization
»
[3G]* >120m (400ft)
»
[HD] >200m (667ft)
»
[SD] >300m (1000ft)
• Re-clocks SDI signals for cascading and thus longer transmission
• Inter-locked power supply for better fixedness
Note: The cable length depends on the characteristics and quality of the cables.
3. Package Contents
• 1x VDA-108-3GS
• 1x 5V power adapter
• 1x User Manual
2
4. Specifications
Model Name
VDA-108-3GS
Technical
SDI standards
SD/HD/3G-SDI
Auto 3G/HD/SD detection
Yes
Supported protocols
SMPTE 259M, SMPTE 292M, SMPTE 424M, SMPTE425M
Video bandwidth
[2.97Gpbs & 2.97/1.001Gbps]
Data rates
270 / 1483 / 1485 / 2970 Mbps
Output impedance
75
Re-clocking function
Yes
Cable equalization
[3G-SDI] >120m (394ft) / [HD-SDI] >200m (656ft) / [SD-SDI] >300m (984ft)
Audio support
Yes
RP-198 pathological patterns
Immune
PCB stack-up
4-layer board [impedance control — differential 100 ; single 50 ]
Input
1x BNC [SDI]
Output
4x BNC [SDI]
BNC connector
75
inter-locked socket
Amplitude: Within 800mV ±3% (<10%)
Eye pattern characteristics
Rise overshoot: Less than 2% (<10%)
[HD]
Fall overshoot: Less than 2% (<10%)
Mechanincal
Housing
Metal enclosure
Model
120.5 x 41.4 x 24.2mm [4.7" x 1.6" x1"]
Dimensions
Package
175 x 128 x 134mm [6.9" x5" x5.3"]
[L x W x H]
Carton
662 x 366 x 290mm [2'2" x 1'2" x 1']
Model
259g [0.6 lbs]
Weight
Package
525g [1.2 lbs]
Fixedness
Inter-locked power supply
Power supply
5V 2A DC
Power consumption
1.3 Watts [max]
Operation temperature
0~40°C [32~104°F]
Storage temperature
-20~60°C [-4~140°F]
Relative humidity
20~90% RH [no condensation]
Note: The measurement results are from Tektronix WFM-7120 with SDI through 1m (3.3ft) long
Belden 1694A
www.marshall-usa.com
VDA-108-3GS Manual
Long time jitter: 0.195 UI (<1.0 UI)
Timing jitter: 0.195 UI (<1.0 UI)
Alignment jitter: 0.127 UI (<0.2 UI)
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