Tech showed me a short list of Altice-compatible modems. Has anyone seen this before? : r/OPTIMUM
Best Optimum Compatible Modems and Approved Routers in 2021 [Reviews] - YouTube
ARRIS SURFboard (16x4) DOCSIS 3.0 Cable Modem/ AC1900 Dual-Band Wi-Fi Router, Approved for Xfinity Comcast, Cox, Charter and Most Other Cable Internet Providers for Plans up to 300 Mbps. (SBG6950AC2) - Walmart.com