It depends on whose equipment you're using. I'm familiar with Motorola headend equipment. Moto uses a device called a Smartstream Encrypter/Modulator (SEM). It's quite the piece of equipment.
Used as a QAM modulator, it has inputs for up eight ASI digital streams, each with up to ten channels each. The output ports (4) each put out two adjacent QAM carriers. They are selectable to any frequency.
Moto's SEM manual has a ton of info, and is fairly easy to read.
Hope this helps.
Re: Digital modulators
Member #: 36232
Registered: 2/16/2005
Posted:
218
Name:
Rob
Occupation:
Engineer
Location:
Sunny Florida
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