Documentation Conventions
This manual uses some special symbols and fonts to call your attention to important information. The
following symbols appear throughout this manual:
DANGER: The Danger symbol calls your attention to information that, if ignored, can cause physical harm
to you.
CAUTION: The Caution symbol calls your attention to information that, if ignored, can adversely affect
the performance of your Harmonic product, or that can make a procedure needlessly difficult.
LASER DANGER: The Laser symbol and the Danger alert call your attention to information about the
lasers in this product that, if ignored, can cause physical harm to you.
NOTE: The Note symbol calls your attention to additional information that you will benefit from heeding.
It may be used to call attention to an especially important piece of information you need, or it may provide
additional information that applies in only some carefully delineated circumstances.
TIP: The Tip symbol calls your attention to parenthetical information that is not necessary for performing
a given procedure, but which, if followed, might make the procedure or its subsequent steps easier,
smoother, or more efficient.
NOTE: You require Adobe Reader or Adobe Acrobat version 6.0 or later to open the PDF files. You can
download Adobe Reader free of charge from www.adobe.com.
© 201 2 Harmonic Inc. All rights reserved.
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Questions and answers
Why does PER parameter flaxtuate
The PER (Packet Error Rate) parameter fluctuates on the Harmonic ProView 7000 because it reflects the rate of errors in received data packets. Fluctuations can occur due to changes in signal quality, interference, incorrect tuning, frequency offset, or issues with carrier or demodulator locking.
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