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Superfast
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Registered: ‎10-01-2012
Message 1 of 3 (391 Views)

QAM?

What is a QAM? What does it do and where is it located in the network?

 

What is the difference between QAM64 and QAM256?

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Superuser
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Registered: ‎08-06-2010
Message 2 of 3 (387 Views)

Re: QAM?

some info on QAM

 

http://en.wikipedia.org/wiki/Quadrature_amplitude_modulation

http://en.wikipedia.org/wiki/DOCSIS

 

or the really basic - 


QAM256
A QAM technique that produces 256 discrete states, each state representing 8 bits of information. The most complex of common QAM techniques.

 

QAM64
A QAM technique that produces 64 discrete states, each state representing 6 bits of information.

 

then you've also got - 

QPSK
quadrature phase-shift keying. A phase modulation technique for representing digital information. QPSK produces four discrete states, each state representing two bits of information.

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Superfast
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Registered: ‎10-01-2012
Message 3 of 3 (376 Views)

Re: QAM?

Thank you, will take a read later on.

 

Shezi

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