Modular Crossover Interface Card Cage for the UTPLinks Video, Data & Power over Twisted Pair Transmission System. The CX452 is a 1 RU card cage designed to hold up to five Modular Crossover cards for the UTPLinks system, mounted horizontally. The card cage combined with plug-in Crossover cards comprises a video crossover and power insertion unit for the UTPLinks system and depending upon the type of cards used, can also include RS-422 distribution and/or video transceiver capability. Four models of four-channel Crossover cards are available. The cards can be used in any combination, allowing the rack system to be customized to the specific application. (Modular cards are sold separately).