The DKM FX Transmitter and Receiver chassis come in several versions that use different port counts, varying power features, and options for redundancy or load sharing. The chassis come in 2-, 4-, 6- and 21-port versions. Each port will allow for a single-height card to be installed, but some cards will consume up to two ports. Below is an example of the ACXMODH2R-R2 with two 1-slot cards, and then the same chassis with one 2-slot card. When building these extenders, pay close attention to the size of the card compared to the size of the chassis you are using.