1) General subject: lines of communication, communications lines (E&Y)
2) Railway term: communication wires
3) Diplomatic term: communication lines, lines of communications
4) Telecommunications: telecommunication, telecommunications
5) Astronautics: communication channel
6) Network technologies: communications links
7) Dactyloscopy: communication channels, communication links, communications
Универсальный русско-английский словарь. Академик.ру. 2011.