noun
public network
Refers to a telecommunications network open to the general public, as opposed to a private or dedicated network.
公衆網を利用してインターネットに接続する。
Connect to the Internet using a public network.
専用線 is a private or leased line, while 公衆網 is a public network shared by many users.
Compound of 公衆 (public) and 網 (network).