This cable allows the MediaMaster server to control a classroom display over RS-232 through the Ethernet connection on the MM-1272 set-top-box associated with that display. This avoids the need for a dedicated control cable for the display and the attendant costs of that additional cabling. This is the null-modem variant of the cable, suitable for controlling DCE serial devices. The MM-1273S for the straight/DTE variant. The cable is available with either sex on the DB-9 end. DCE devices typically require a female cable. Standard lengths are 3 and 7.5 feet, with custom lengths available.