olemus
võrgutarne klass (1, 2, 3), mis põhineb
kokkuühenduslepingu tingimustel ja sõltub kontekstist
=
network provision class based on the terms of the interconnection agreement and depending on the context

näiteid
https://www.techopedia.com/definition/27460/tier-1-carrier

https://encyclopedia2.thefreedictionary.com/Tier+3+network