This European Telecommunications Standard (ETS) defines the requiremen ts for the transceiver of the pan-european digital mobile cellular and personal communication systems operating in the 900 MHz and 1800 MHz band (GSM 900 and DCS 1800). Requirements are defined for two categories of parameters: - Those that are required to provide compatibility between the radio c hannels, connected either to separate or common antennas, that are use d in the system. This category also includes parameters providing comp atibility with existing systems in the same or adjacent frequency band s. - Those that define the transmission quality of the system. This ETS defines RF characteristics for the Mobile Station (MS) and Ba se Station System (BSS). The BSS will contain either Base Transceiver Stations (BTS) or microcell base transceiver stations (micro-BTS). The precise measurement methods are specified in GSM 11.10 and 11.20. Unless otherwise stated, the requirements defined in this ETS apply to the full range of environmental conditions specified for the equipmen t (see annex D). In this ETS, some relaxation are introduced for GSM 900 mobile station s which fulfil the following conditions: - pertain to power class 4 or 5 (see section 4.1.1); - not designed to be vehicle mounted (see GSM 02.06). In this ETS, these mobile stations are referred to as small MS. NOTE: In this ETS, a handhold which can be connected to a car kit is n ot considered to be vehicle mounted. Mobile stations may operate on more than one of the frequency bands sp ecified in section 2. These mobile stations, defined in GSM 02.06, are referred to as Multi band mobile stations in this ETS. Multi band m obile stations shall meet all requirements for each of the bands suppo rted. bhe relaxation on GSM 900 for a small MS are also valid for a multi band MS if it complies with the definition of a small MS. The RF characteristics of repeaters are defined in annex E of this ETS . Annexes D and E are the only sections of this ETS applicable to repe aters. Annex E does not apply to the MS or BSS.