The Single Wire Protocol (SWP) is used for Near Field Communication (NFC) as the interface between the SIM card as the secure element and the contactless front-end (CLF) chip. The CLF connects the mobile phone with NFC cards, tags, and devices. The Host Controller Interface (HCI) acts as a further Bluetooth interface transmitting status and control functions. For comprehensive NFC testing, it is indispensable that the contactless and the contact-based interfaces of the CLF are tested simultaneously.