Cisco DNCS System Release 2.8.1 3.8.1 4.3.1 User Guide

A content MQAM modulator receives data that provides set-tops with content. Like the QAM modulator, the
MQAM modulator it takes the data it receives and, if necessary, it encrypts the data before modulating it onto an
RF carrier for distribution to all DHCTs in a hub. 

However, one MQAM modulator can perform the work of four QAM modulators. This is possible because the
MQAM modulator can receive content from up to two MPEG sources and send the modified data out to the hubs
on up to four transport streams. (The QAM modulator receives content from only one MPEG source and can send
the modified data out on only one transport stream.)

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