Digital Radiocommunication Testers CMD54/57 [1; 2] are tried and proven instruments for testing base stations (BTS) in production, installation and service. They can control base stations and measure their RF interfaces with the optional Abis interface and Abis control software, CMD assuming essential tasks of the base station controller (BSC). The Abis interface between the BSC and a BTS operates at a data transfer rate of 2.048 Mbit/s or 1.544 Mbit/s. The Abis protocol handles the exchange of data and signalling information between CMD and a BTS.
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