1## UWB Multi-device CTS Tests 2 3### General Requirements for test setup calibration 4Two Android UWB devices (DUT and reference device) are needed for these tests. 5 6The devices need to also obtain a valid country code to enable UWB. Country code 7sources used are (any one of them is sufficient): 81. Country code from telephony connection (insert a working SIM card in the 9device) 102. Country code from Wi-Fi access points which support 80211.d (have one or more 11wifi access points in the environment) 123. Country code from location (turn on [location]( 13https://support.google.com/android/answer/3467281?sjid=2881239016184571424-NA) 14on your devices and enable [location accuracy]( 15https://support.google.com/android/answer/3467281?sjid=2881239016184571424-NA#location_accuracy)). 16 17#### Special Requirements for `CtsUwbMultiDeviceTestCase_RangingMeasurementTests` test case 18The devices should be placed in the line of sight environment in a non-reflective chamber with 191 m distance between the DUT and reference device. Both devices should be positioned in portrait 20orientation perpendicular to the ground, with the screen facing perpendicular away from each other. 21 22Refer to [this page]( 23https://source.android.com/docs/core/connect/presence-requirements#calibration-setup) 24for an example of similar physical setup with illustration. 25