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8937D Dual SDI/ASI Reclocking Equalizing Distribution Amplifier
Key Features
•
Two separate distribution amplifiers on a
single card
•
One with a looping differential input with
three active outputs in addition to the
loop-through passive output
•
One with a single-ended terminating
input with four active outputs
•
Suitable for SMPTE 310M, SMPTE 259M,
DVB ASI, SDI 270 Mb/s and most other
800 mV data from 4 Mb/s to 360 Mb/s
•
Input presence detection for each channel
with SNMP trap generation
•
Independent reclocking circuits for each
channel to reduce jitter
•
Automatic input cable equalization for up
to 300 meters for each channel
•
Card edge LED status indicators
Specifications
Supported Frame Types
GeckoFlex with 8900V-R GeckoFlex Video rear module,
Gecko video frames: 8900TX-V, 8900TF-V, 8900TFN-V
Power Rating
3.5 Watts – single slot
Inputs
Type: 800 mV ±10% serial digital data including
SMPTE 259M
Connector type: BNC
Impedance: High Z differential loop-through and 75Ω
terminating
Supported data rates: 4 Mb/s through 360 Mb/s
Reclocked data rates: 143, 177, 270, 360 Mb/s
Return loss: >15 dB (up to 360 MHz)
Auto equalization: Up to 300 meters (270 Mb/s)
This distribution amplifier is ideal for space-
constrained applications where a limited
number of signal copies are required. By
offering twice the density, it's a perfect solution
for mobile production applications—enabling
20 channels of distribution in only 2 RU of
rack space. Both channels are fully DVB ASI
compatible and can be used in any application
where standard SDI video or ASI signals are
to be copied and distributed. The standard
reclocker circuits greatly reduces jitter-induced
over cable runs adjacent to high power lines
or from unstable sources of standard data rate
signals. The reclocker can easily be disabled
to pass SMPTE 310M and other nonstandard
data rate signals. A user-enabled video
presence detection feature generates individual
SNMP traps for each channel that can be sent
to our NetCentral SNMP manager or other
SNMP systems.
ASI or
SDI In 2
ASI or
SDI In 1
SDI Out 1
(passive)
Local
Control
Output
Type: 800 mV serial digital data in phase with the
input signal
Number of outputs:
• Four outputs, three active plus one passive loop-
through
• Four outputs, four active signals
Connector type: BNC
Impedance: 75Ω
Return loss: >15 dB (up to 360 MHz)
Performance
Electrical Length: <20 ns
Temperature Range: 0° – 45°C
Local Indicators/Controls
LED indicators:
• Signal presence
• Input sample rate
User controls:
• Bypass/auto jumper selection for reclocker
• Local/local-remote control enable jumper
Remote: SNMP trap generation – input presence
detection
8900V-R
J1
J2
Output 2
J3
J4
J5
J6
Input 2
J7
J8
Output 1
J9
J10
Input 1
Loopthru
EQ
Reclocker
Bypass
Video
Switch
Input
Presence
Detection
EQ
Reclocker
Video
Bypass
Input
Switch
Presence
Detection
Microprocessor
LEDs
Ethernet Control
via frame bus
Ordering Information
This module can be mounted in a GeckoFlex
frame when ordered with the 8900V-R GeckoFlex
Video rear module.
8937D
Dual SDI/ASI reclocking equalizing distribution amplifier
For detailed specifications, installation, and setup
instructions see:
www.grassvalley.com/docs/modular
29
Output 2
Output 1
Output 1
(passive)
ASI or
SDI Out 2
ASI or
SDI Out 1
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