The MM5829 series of coaxial cable connectors from Murata are small, thin and suitable for internal wiring of cellular phones and small wireless equipment. When connecting these coaxial cable connectors, it may feel difficult to identify the connection pins of the devices.
For example, the MM5829-2700RK0 coaxial cable connector only has one I/O pin. It can be identified by looking at the bottom of this connector. Referring to the below bottom view, its I/O pin connects to a trace that goes to the center of the part, and the rest of the pins are all ground pins.