An apparatus include a first electronic component having first interface circuitry configured to generate an electromagnetic signal. The first electronic component is switchable such that in a first mode of operation, the first interface circuitry is configured to transmit the generated electromagnetic signal via a first antenna, and in a second mode of operation, the first interface circuitry is configured to transmit the electromagnetic signal to a second electronic component via a constrained signal path coupling the first electronic component and the second electronic component. The generated electromagnetic signal may be a radio frequency signal or an optical signal.