Comtrol RocketPort (99380-3) Serial Adapter - The RocketPort 32 Rackmount RS-232 Interface RoHS is a separate, rack mountable interface that has 32 RS-232 RJ45 connections. It is for use with any RocketPort 32-Port card product, and comes with a 10-foot cable to connect to the board. The chassis, which is one "U" thickness, fits perfectly into a 19" IT equipment rack, and is also stackable.