Abstract: A method of transporting digital data in an active distributed antenna system DAS. The method includes receiving data from at least one data source, processing the received data, and providing the processed data as digital real-valued passband data for further transport within the DAS. An apparatus and computer program configured to perform the method are also provided.

Abstract: Mechanisms for controlling sample rate and frequency shift of a digital signal in a multi-operator network. A method is performed by a network node. The method includes obtaining a frequency difference and a phase difference between two clock domains. One of the clock domains is associated with a radio access network of a network operator of the multi-operator network and the other of the clock domains is associated with a distributed antenna system in the multi-operator network. The method includes controlling sample rate conversion of the digital signal between the two clock domains using the phase difference. The digital signal is communicated between the radio access network and the distributed antenna system. The method includes controlling a frequency shift of the digital signal using the frequency difference.

Abstract: A digital distributed antenna system (“DAS”) configured to route at least one reference signal received by at least one digital master unit to at least one digital remote unit. The DAS has at least one processing unit configured to cause the DAS to measure a strength of a received reference signal, determine a required strength that the received reference signal should have upon being transmitted to a wireless communication device located in a coverage area served by the at least one digital remote unit, and adjust a gain of a routing path of the DAS via which the received reference signal is to be routed to an antenna port of the at least one digital remote unit such that the strength of the received reference signal attains the required strength when being transmitted from said at least one digital remote unit.