The point of interconnection between a user terminal and a private or public network. 2. The point of interconnection between the public switched network and a privately owned terminal. Note: Code of Federal Regulations, Title 47, part 68, stipulates the interface parameters. 3. The point of interconnection between one network and another network. 4. The point of demarcation between the carrier's facilities and the customer installation, which establishes the technical interface and division of operational responsibility. In this definition, the term "customer" refers to the end-user.