Beerdrinker.
CNS/ATM is the acronym for "Communication and Navigation Services/Air Traffic Management", it applied to the service providers, not equipment.
ADS-B/C etc is, in reality, just a datalink, what the data is, and what you do with it, on the ground or in the air, determines what use you get out of it.
ICAO recognise three quite separate and mutually incompatible ADS-B/C systems, UAT(CDMA format), VDL-4 (TDMA format) and ES1090, which uses some previously unavailed but very bandwidth limited message slots on the Mode S transponder signal format.
Tootle pip!!