Leased lines with ISDN.
Leased lines were always on, so you were connected to the ISP around the clock. ISDN was an early broadband, or faster than dial up speeds… But not by much.
This is what we did for a small web business in the mid nineties. It was a big upgrade over dialup, but the costs were eye watering. I recall the setup being £3k (UK) then several hundred per month
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