For a list of all currently documented Marvell chipsets with specifications, see Marvell.
"3751-56000103G" is silkscreened on the board of the FCC photos. (Original filing)
"3751-56000103R" is silkscreened on the board in the FCC photos. (CII PC: 10/16/2009)
This device appears to be a CyberTAN PW600-M.