I found a 52k modem for 5 bucks at a goodwill : r/LGR
Cable modem - Wikipedia
M TEL International - USB TV STICK Brand:Gadmei Features:::::::::: Unique USB design,small and easy to carry. Embedded 10-bit video decoder to achieve stable picture @ vivid color. Full-system AV input port, DVD
Hua wei GPON ONT HG8042 Router Modem 1GE 3FE CATV RF port HGU|Fiber Optic Equipments| - AliExpress
1pcs Hua Wei HG8120C GPON ONU ONT Router 1GE 1FE 1POTS HGU terminal FTTH fiber modem HG8120C Viop TEL GPON ONU|Fiber Optic Equipments| - AliExpress