Allows the PC to use the phone's mobile data connection via a USB cable.

The refers to a specific driver version used to enable Windows PCs to communicate with Samsung mobile devices as modems or composite USB devices. This driver is essential for tasks like using your phone for USB tethering, flashing firmware via Odin , or executing AT commands through software like Realterm. Where to Find and Download

Samsung Android Modem Device Driver (MSS Ver.3) —specifically the ssudbus.sys

The MSS v3 driver exposes a interface to userspace (rather than legacy TTY). The RIL daemon ( rild ) communicates via AF_NETLINK sockets with family NETLINK_MSS .

Note: Larger buffers reduce overruns but increase latency.