wireless bandwidth question

Im looking at a licensed ethernet microwave solution.   It can be configured to run anywhere from 6 to 38 ghz with a bandwidth of 7 to 56 mhz.

what does the second part mean so to speak... the 7 to 56 mhz.
does that mean you pic like a center bandwidth... for example.  20 ghz... and the frequency
can fluxuate 56 mhz....    meaning...    20.023 ghz to 19.977 ghz...

im confused as to what the bandidth means in regards to a chosen frequency.
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Yes you are correct.

for example 802.11g has a channel bandwidth or frequency occupation of 22MHz. -11MHz to +11MHz surrounding the channels centre frequency.

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