Editing Multiplex baseband (section)

In [[telecommunications]], the term '''multiplex baseband''' has the following meanings: 
#In [[frequency-division multiplexing]], the frequency [[band (radio)|band]] occupied by the aggregate of the signals in the [[line (electrical engineering)|line]] interconnecting the multiplexing and [[radio]] or line equipment.<ref>{{cite book |title=Telecommunications: Glossary of Telecommunications Terms |date=1997 |publisher=Government Institutes |isbn=978-0-86587-580-7 |page=M-18 |url=https://books.google.com/books?id=hrVaAAAAYAAJ&pg=RA9-PA18 |language=en}}</ref>
#In frequency division multiplexed [[carrier signal|carrier]] systems, at the input to any stage of [[frequency translation]], the frequency band occupied. 

For example, the output of a group [[multiplexer]] consists of a band of frequencies from 60&nbsp;kHz to 108&nbsp;kHz. This is the group-level [[baseband]] that results from combining 12 [[voice-frequency]] input channels, having a [[Bandwidth (signal processing)|bandwidth]] of 4&nbsp;kHz each, including guard bands. In turn, 5 groups are multiplexed into a super group having a baseband of 312&nbsp;kHz to 552&nbsp;kHz. This baseband, however, does not represent a group-level baseband. Ten super groups are in turn multiplexed into one master group, the output of which is a baseband that may be used to modulate a [[microwave]]-frequency carrier.