通信

1. Origins, structure, and basic meaning

• Structure: 通信 is read as つうしん and is a noun and する verb for exchanging information or signals across a distance.
• Basic usage: A connection being interrupted appears in 通信が途切れる, while communicating by radio appears in 無線で通信する.

2. Common pitfalls and similar expressions

• Connection state and medium
  • Use が for the connection state and で for the medium.
• Difference from 連絡
  • 通信 also covers a signal system or exchange, not only individual contact.