A remote radio head (RRH), also called a remote radio unit (RRU) in wireless networks, is a remote radio transceiver that connects to an operator radio control panel via electrical or wireless interface . When used to describe aircraft radio cockpit radio systems, the control panel is often called the radio head.
Source: Remote radio head - Wikipedia
Microwave ODU ( Outdoor Unit )
The term ODU is used in Split-Mount Microwave systems where an Indoor Unit (IDU) is typically mounted in an indoor location (or weatherproof shelter) connected via a coaxial cable to the ODU which is mounted on a rooftop or tower top location.
Source: Microwave ODU - Microwave Link
