DOCSIS 3.0 Tutorial – The EQAM

July 1st, 2010 by Brady


In my article on DOCSIS 3.0 M-CMTS architecture, I talked about the distributed nature of the CMTS with an M-CMTS core (the CPU of the system), a DOCSIS Timing Server, and an edge Quadrature Amplitude Modulator (EQAM). I am going to cover the EQAM in detail in this article because in the past couple of years, EQAM (also spelled eQAM) has rapidly become part of our vocabulary but its operation and value often go unappreciated. Further, in order to fully understand DOCSIS 3.0 operation, downstream channel bonding, and possible issue which may arise, a thorough understanding of the eQAM is critical.

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Published by Brady on Jul 1, 2010 under DOCSIS 3.0 | Post your comment now

DOCSIS and Cable Modems – How it works :: Advanced RF

February 2nd, 2009 by Brady


In high speed data communications, the industry has evolved and implemented complex modulation schemes which vary a signals voltage (amplitude), phase, and frequency in order to transmit more data, faster. The following will cover these methods in order to describe how Quadrature Amplitude Modulation (QAM) works in DOCSIS communications.
We live in an analog world. Sure, [...]

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Published by Brady on Feb 2, 2009 under DOCSIS 101 | Post your comment now