What Does Protocol-Transparent Mean?

Protocol transparency is the ability of a device or application to work independent of the type of protocol used, and a device or application that can work as such is deemed protocol transparent. The user is not concerned with the intermediate operations needed to convert from one protocol to another. All these operations and inner workings are completely transparent to the users and are performed by protocol converters at the background.

Techopedia Explains Protocol-Transparent

The term transparency in computer science refers to something that is made invisible or hidden from the users. An application may require several background processes and operations that are necessary to make interaction possible between the various interfaces that it has to work with. In general, network transparency is achieved when a protocol is able to transmit data over a network in a manner that is invisible to the user.