LINK ELECTRONICS, INC.
HD or SD DIGITAL DISTRIBUTION AMPLIFIER
FEATURES
Model VDA-55
m DC Powered, Portable
m Four HD SD SDI Outputs
m Lock/Format Indication
m Automatic Equalization and Re-clocking
m Compact Size
m SMPTE 259M, 344M, 292M compliant
m Wall Wart Power Supply
m HD SD SDI Input
HD SD SDI distribution amplifiers combine
exceptional performance with both value and
compact size. The VDA-55 supports 143Mb/s,
270Mb/s and 1.485Gb/s Auto Rate Detection with
"Power OK", "Lock" and "HD" indicators. The
compact size of this distribution amplifiers, allows
it to be located in spaces where standard rack
space is limited.
The three LED's show the status of the input
signal; locked, and whether the data is Serial
Digital standard definition, or High Definition, HD
SDI. The signal output level is 800mV p-p, and
reclocked. The VDA-55 can be used in places
where space is a premium and at the same time
get excellent performance and lower cost.
The VDA-55 is designed for applications that
require equalization, re-clocking and distribution for
HD SD SDI digital video as per SMPTE 259 (SD1)
and SMPTE 292 (HD). The VDA-55 includes an
automatic input cable compensation circuit
commonly referred to as an adaptive cable
equalizer.
The LINK VDA-55 HD SD SDI DA restores the
incoming signal to its proper amplitude. The signal
is reshaped with automatic equalization, and DC
restoration. The VDA-55‘s maximum equalized
cable length; for SD up to 250 feet at 270Mb/s, and
HD up to 100 feet at 1.485Gb/s. Four outputs are
provided on the end panel, as well as a detachable
DC power cable.
The VDA-55 includes a crystal referenced re-
clocking circuit that senses three data rates: 143
Mb/s, 270Mb/s and 1.484 Gb/s. If the data rate is
one of these three rates the re-clocker will
automatically activate and reduce high frequency
jitter. If the incoming data rate is not 143 Mb/s.
270Mb/s or 1.484 Gb/s, then the VDA-55 re-
clocker will go into the bypass mode. If the data
rate is 143 Mb/s or 270 Mb/s, the VDA-55 output
rise times are slowed down to comply with the
SMPTE 259 specification. The default for the VDA-
55 is the faster SMPTE 292 HD rise time.
There are three LED’s on the end opposite the BNC
connectors, showing Lock, Signal Presence and
DC Power. There are four outputs that represent
the input.
The VDA-55 input signal can be 143Mb/s,
177Mb/s, 270Mb/s, 360Mb/s, 540Mb/s, and 1.485
Gb/s standards.
The VDA-55 carries a 10-year warranty including
parts and labor.
LINK
ELECTRONICS, INC. m 2137 Rust Ave. m Cape Girardeau, MO 63703
Phone: 573 334 4433 m FAX: 573 334 9255
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