Frequently Asked Questions
Q: What is Smart SpectrumTM?
Q: How does Smart Spectrum achieve "unparalleled reliability?"
Q: We've been using direct sequence spread spectrum for data transmission. How does algorithmic frequency hopping compare to direct sequece, and how does it work?
Frequency hopping, on the other hand, takes incoming data and breaks it down into smaller individual packets, which are then sent on separate frequencies. Once the packets have been transmitted, the data is recompiled in its original format. If a packet cannot be successfully sent on a given frequency, it is re-sent on another. With 112 channels over which to send the data packets, Smart Spectrum ensures that your critical data gets through. See schematic of a typical frequency hopping pattern. For more information read "License-Free Spread Spectrum and FSK Wire Industrial Data Communications," an article about FHSS technology.
Q: Our PLCs operate well below data rates of 144 Kbps. Why should we get rates greater than what we need?
Q: What is the advantage of the highly sensitive RF receiver?
Q: What if an error occurs during transmission?
View Data-Linc modems utilizing Spread Spectrum technology. "Introduction to Smart Spectrum" is available to download (pdf file, size 73K). The file requires Adobe Acrobat Reader to view. If you need a free copy, visit Adobe.)
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