Arrangement for using a mobile terminal in a radio switching system with different transmission standards

In order to exploit both the advantages of a cordless system according to the DECT standard and the advantages of a cellular mobile radio system according to the GSM standard, dual-mode devices are known which automatically switch over to the most cost-effective standard. The effort for these devices and for the necessary additional circuits in the network infrastructure are avoided if according to the invention, the handset and a handset adapter are equipped with an infrared interface over which all necessary information necessary for human-machine communication are transmitted standard independent. Thus, it is possible without interference in the network infrastructure, for example, with a DECT handset via a GSM handset adapter to access the GSM mobile network. Via the infrared interface circuit,