Link electronic Stereo Amplifier VDA 55 User Manual

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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