150
Hardware Configuration Reference
searchRx.dspDataCompression
Syntax
searchRx(1..4).dspDataCompression:
enum
enum
= {Off, On}
Description
This provides a compression feature that moves the data from the DSP module back to the
controller much more efficiently.
The default setting is Off.
Data compression improves the search system performance when the limiting factor is the IO
bandwidth between the DSP and the controller.
It also helps when there is a channelizer subsystem that passes data back to the controller via
the VXI backplane because it frees up bandwidth.
The circumstances that benefit from data compression:
• High resolution settings (low RBW values) when DSP is not the limiting factor
• Multiple search channels (supported by option EMC)
• When used with a collection subsystem having many narrow-band channels. (Or you want
to add more channels to an existing system that is already IO bound.)
The disadvantages:
• When performance is limited by the DSP processing resources (such as with a large
number of averages and a high resolution setting) the compression algorithm may degrade
search performance somewhat.
• The compression algorithm also impacts amplitude accuracy by as much as ±0.1 dBm.
Note
It is possible that an ASD feature extraction library may request time data. Time data is
passed from the DSP to the controller via the same path as the magnitude data (the VXI
backplane). Time data is not compressed when
dspDataCompression
is
On.
Summary of Contents for E3238S
Page 62: ...62 Hardware Installation ...
Page 94: ...94 Software Installation and Configuration ...
Page 198: ...198 Application Resources ...
Page 218: ...218 Multi Channel Hardware Installation ...
Page 242: ...242 Specifications ...
Page 252: ...252 Appendix A d E3238s Listing E3238S Installation ...
Page 268: ...268 Appendix B d e3238s cfg Listing E3238S Installation ...