A transceiver adapted to emulate devices using one or more of a plurality of different radio access protocols. The transceiver comprises a timing module, the timing module being adapted to maintain a record of the current timing state which would apply to each of the different radio access protocols the transceiver is able to use, if that radio access protocol was being used. When the transceiver changes a radio access protocol being used to emulate a device from a first radio access protocol used to emulate a first device to a second radio access protocol used to emulate a second device, the transceiver is adapted to use the record of the current timing state which would apply to the second radio access protocol to set the timing of the second radio access protocol.