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适用范围：This European Standard applies to signalling and telecommunication apparatus which is installed inthe railway environment. Signalling and telecommunication apparatus mounted in vehicles is coveredby EN 50121-3-2.This standard specifies limits for emission and immunity and provides performance criteria forsignalling and telecommunications (S&T) apparatus which may interfere with other apparatus in therailway environment, or increase the total emissions for the railway environment beyond the limitsdefined in the appropriate standard and so risk causing Electro-Magnetic Interference (EMI) toapparatus outside the railway system.Apparatus which complies with the emission levels of EN 61000-6-4 will meet the emissionrequirements of this standard provided that emissions from any d.c. power port are within theemissions limits specified for a.c. power ports. The immunity levels of EN 61000-6-2 will also beadequate except for the special case of apparatus as defined in note 1 of Table 1. This standardprovides the immunity requirements for such apparatus.The immunity levels given for the apparatus will in most cases allow the apparatus to perform asintended in the railway environment (see note). The immunity level establishes a common referencefor evaluating the performance of the apparatus when subject to interference resulting from directexposure of the apparatus and associated cables to a radio frequency field, or by coupling of theinterference from a remote source.If a port is intended to transmit or receive for the purpose of radio communication (intentional radiators.e.g. transponder systems), then the emission and immunity limits in this standard at thecommunication frequency do not apply.The standard does not specify basic personal safety requirements for apparatus such as protectionagainst electric shock, unsafe operation, insulation co-ordination and related dielectric tests. Therequirements were developed for and are applicable to this set of apparatus when operating undernormal conditions. Fault conditions of the apparatus have not been taken into account.The requirements and test methods also apply to telecommunications and signalling data and powerlines connected to the equipment under test (EUT).The frequency range considered is from d.c. to 400 GHz. No measurements need to be performed atfrequencies where no requirement is specified.For products in the scope of EN 61000-3-2 or EN 61000-3-3, the requirements of those standardsapply.Testing methods are given in the basic standards listed in Clause 2, Normative references.These specific provisions are to be used in conjunction with the general provisions in EN 50121-1.NOTE The immunity and emission levels do not of themselves guarantee that the integration of apparatus will necessarily besatisfactory. The standard cannot cover all the possible configurations of the apparatus, but the test levels are sufficient toachieve satisfactory EMC in the majority of cases.