A Radio Base Station (101; 601) for a radio telecommunications network (100) comprising a Radio Unit (103) configured to transmit and receive radio telecommunication signals and a switch unit (104). The Radio Base Station further comprises a local Digital Unit (105) configured to process digital baseband signals received from the Radio Unit (103) and generate digital baseband signals sent to the Radio Unit (103). The Radio Base Station further comprises an external communications interface (112) configured to connect at least one remote Digital Unit (106, 107) to the Radio Unit (103) of the Radio Base Station. The switch unit (104) is configured to selectively connect the Radio Unit (103) with the local Digital Unit (105) or the external communications interface (112).
