This European Standard specifies:— the functional requirements for a Call For Aid and Communication device;— the dynamic analysis of the Call For Aid system.NOTE 1 The Call For Aid function on existing vehicles may require modification to work in conjunction with vehicles that comply with this European Standard.NOTE 2 The Call For Aid function is separate from the Passenger Alarm System (PAS), which is provided to deal with emergency situations. The PAS is described in EN 16334.NOTE 3 The communication device is different from the PAS, but it can share some parts of the PAS to achieve its functionalities.NOTE 3 The communication device is different from the PAS, but it can share some parts of the PAS to achieve its functionalities.NOTE 4 The PAS is regarded as a safety relevant system whereas the CFA and communication device are non-safety relevant aids to passengers.