Abstract: A mobile communication system includes base stations, a mobile services switching center, a digital transmission system connecting the base stations to the mobile services switching center, and a network termination of an ISDN base rate access. The digital transmission system has at least one data link connection operating at the rate of the ISDN basic rate access, and digital time division trunk circuits. At least one base station comprises an ISDN basic rate access block for connecting the base station to said data link connection operating at the rate of the ISDN basic rate access. The digital transmission system comprises a switching means positioned between the base station and the mobile services switching center for connecting said ISDN basic rate access block of the base station through the data link connection operating at the rate of the ISDN basic rate access to a digital trunk circuit.

Abstract: A base station for a cellular radio system including switching centers and base stations connected thereto by time-division telecommunication links. The base station includes one or more transceiver units for establishing radio links, a multiplexer/demultiplexer for multiplexing transmission channels on the telecommunication links, for extracting synchronization and clock signals, and for demultiplexing data to be sent from the base station to a transmission channel of the telecommunication link. The base station further includes switches for switching respective transceiver units to respective transmission channels of the respective telecommunication links.