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 straight-through variant of the cable, suitable for controlling DTE serial devices. The MM-1273C for the DCE variant. The cable is available with either sex on the DB-9 end. DTE devices typically require a male cable. Standard lengths are 3 and 7.5 feet, with custom lengths available.