Adapter for data transmission to and from a radio telephone.

摘要

A data terminal is able to use data services of a cellular network so that it is detachably connected to a mobile phone with a connection cable. The data services need not be supported by the telephone. The connection cable forms a fast synchronous serial bus. The service-specific data protocols needed in implementing a data service are accomplished in a microprocessor unit in an external interface adaptor connected to one end of the serial bus, said processor being via the bus directly connected to the processor performing the signalling and control functions and the channel coder of the phone. Thus, the interface adaptor is able to exchange messages directly with the processor unit and the channel coder of the phone. <IMAGE>