RUECKFUEHRUNGSEINRICHTUNG FUER EIN DIAGNOSE-UNTERSYSTEM FUER EINE ENTFERNTE BASISSTATION

摘要

Radio system infrastructure equipment is provided which comprises base station transceiver equipment 20 for communication with a mobile transceiver and diagnostic transceiver equipment 35 associated with the base station transceiver equipment for generating test signals and feeding them to the base station transceiver equipment. A loopback facility is provided within the infrastructure equipment for looping back a signal received from the diagnostic transceiver equipment at a point within the infrastructure equipment. This signal is returned to the diagnostic transceiver equipment, where it is tested, for example by comparison with the original signal, and faults are diagnosed. The test signal may be looped back from various points so that various parts of the equipment may be tested. In order to facilitate a loop back via the public service telephone network 30 without the test signal being cancelled by echo cancellers 31, 32, a maintenance terminal unit is connected to the network 30 and incorporates means for receiving a signal from the network, means for storing the signal, and means for automatically retransmitting the signal to the network after a predetermined delay, (Fig. 6).