Sierra Video 507112-xx - Manual (Page 3)

DigiLinx Equalizing Digital DA User’s Guide 3
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)