If anyone is looking for a product that is reasonably priced and is still being produced/update, the ADVA Optical (aka MRV, aka Xyplex) console servers still work great
https://www.advaoptical.com/en/products/network-infrastructure-assurance/lx-series From their specs: 4, 8, 16, 32 and 48 serial ports V.92 modem option Single or dual power 120-240VAC, 50/60Hz: 0.5A per system 36-72VDC dual feed: 0.75A per system 2 x Ethernet NEBS Level 3 certified
