If you are trying to access the router’s web interface (usually found at 192.168.1.1 ), here are the default combinations used by the manufacturer and ISPs:
In most deployments, the H196A will have a sticker on the bottom or side casing. This sticker contains: zte h196a default password exclusive
If your device is provided by Optimum (formerly Cablevision) or Altice: If you are trying to access the router’s