These are the technical characteristics and methods of measurement for mobile stations, for the Pan European Personal CommunicationDigital M obile Radio System standardized by the ETSI Technical Committee Speci al Mobile Group (SMG). In these specifications, a GSM(DCS 1 800) Mobile Station can be: - a vehicle mounted station; - a transportable station; - a handheld station; - a vehicle mounted/transportable station; - a vehicle mounted/handheld station. These specifications cover the minimum characteristics considered nece ssary in order to provide sufficient equipment performance for mobile station equipment in the GSMDCS 1 800 system and to prevent interferen ce to other services or to other users, and to GSM and DCS 1 800 PLMNs . Where the 900 MHz service is referred to in sections of GSM 11.10 no t included in this document then this shall be considered as the 1 800 MHz service. They do not necessarily include all the characteristics which may be r equired by a user, nor do they necessarily represent the optimum perfo rmance achievable. They apply to the public land mobile radio telephone service in the GS MDCS 1 800 system, using constant envelope modulation and operating on radio frequencies in the 9001 800 MHz band with a channel separation of 200 kHz and carrying 8 full rate traffic channels or 16 half rate c hannels per carrier according to the TDMA principle.