The CT400 and CT400P5 Splitters are used to provide room drops (similar to T-Tapping) from the station commons bus to addressable stations and zone lamps. Typically, they are used when a station commons bus is run down a hallway from corridor dome lamp to corridor dome lamp, or centrally down the hallway. Each splitter provides six jacks-an in and an out, plus up to 4 room drops.

The CT400 Splitter is used for stations that have 6P6C connectors and the CT400P5 is used for stations with 8P8C connectors for trunk cable wiring.

The CT400P5 Splitter may also be used for the peripheral bus-wiring from IR4xx-series stations to their peripheral switches.

The CT400P5 Splitter is also used for the Tek-CARE120 or 160 master bus to connect two or three master stations to a single port on the NC120/160 CE Module.