AS MODEM is the example of DCE?

AS MODEM is the example of DCE please give me such concrete some examples of interface.

Interface refers to a tool and a concept that provides a point of interaction between components. It can be in the form of hardware and software.
Interface allows two independent systems to meet or communicate with each other.

So, in the context of your query, the wire connectors, plugs and sockets which are used to connect a modem with other system are the examples of interface.