also: ダイアルアップ
noun
dial-up; dial-up connection
Refers to a dial-up internet connection, typically via a modem. Now mostly historical, but still understood in technical contexts.
昔はダイヤルアップでインターネットに接続していた。
In the old days, we connected to the internet via dial-up.
ダイヤルアップの接続音を覚えていますか？
Do you remember the sound of a dial-up connection?
Borrowed from English 'dial-up', referring to establishing a network connection by dialing a phone number.