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SIERRA VIDEO SYSTEMS, INC.
Digilinx Equalizing Digital Video Distribution
Amplifier Family User’s Guide
507112-04
507112-08
507112-12
V1.1
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Introduction
This product equalizes a customer provided serial digital video signal, producing 4, 8, or 12 copies of the
equalized input signal; depending on the version purchased.
The equalizer accepts data rates ranging from the 19.39Mbps ATSC ‘transport stream’ to 540Mbps serial
digital video. The four output product consumes one Digilinx frame 'slot', while the 8 and 12 output
products use two adjacent frame 'slots'.
These products do not provides Smartlinx monitoring of the signal status. For Smartlinx versions of this
family, refer to the 507116-xx product family, which allows Smartlinx hosts to monitor signal presence
and standard.
Peripheral Connections
507112-04:
507112-08:
507112-12:
DigiLinx Equalizing Digital DA User’s Guide 2
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The rear panel provides the following signal connections to the user:
INPUT - This is a 75 Ohm BNC connector to which the incoming video signal is applied. For
270Mbps signals, this should be less than 50 meters from the source of the signal.
OUTPUTS - These are 75 Ohm BNC connectors which provide equalized, amplitude controlled
copies of the INPUT signal.
Application Notes
Equalizing DA’s boost the high frequency content of incoming digital pulse streams until flat topped
pulses result. This compensates for the frequency dependent dispersion of signals along coaxial cable.
While significantly less expensive than reclocking DA’s, equalizing DA’s do not reduce jitter over long
source to DA cable runs as well as reclocking DA’s.
The maximum distance from a source to the input of a reclocking DA depends on many things. The jitter
intrinsic in the source, the type of cable used, the proximity of the input cable to other ‘noisy’ cables, the
length and type of output cables used, and the jitter tolerance of the destination devices all help define
maximum cable length. If quality cables are used, input sources provide <300psec jitter, and the load
tolerates 740psec. jitter(at 270Mbps), 50 meters of cable can be placed between the video source and the
input of the equalizing DA.
Specifications
Data Rate Range- 50-600Mbps(NRZI), 19-50Mbps(ATSC transport stream)
Return Loss(in & out)- >15db from 100KHz to 500MHz
Jitter- <400p seconds with input driven through < 200M of Belden 8281
Operating Temperature- 0 to 70C(non condensing)
Guaranteed Calibrated Temperature-20 to 40C(non condensing)
Operating Humidity- 5-95% RH(non-condensing)
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