Achieving EMC compliance by design - case study of fixed remote station in corDECT WLL system

Telecommunication has an important role in society enabling effective voice & data communication between people across the globe. EMC compliance is mandatory and vital for telecom products. This paper deals with the efforts put in during the design & development and EMC testing of such a telecom product - Wireless in Local Loop (WLL) system to comply to International standards like ETSI, IEC & CISPR and National standards like TEC. This paper also highlights the advantages of incorporating EMC design rules in early stage of design, due to flexibility in choosing of components like filters, shields and protective devices to achieve cost-effective solution and avoiding field modification. A case study of telecom product, viz., (FRS) Fixed Remote Station of Wireless Local Loop (WLL) subsystem, used in subscriber premises for voice telephony and Internet connectivity is taken up for elucidating EMI problems encountered during the EMC certification process and the measures taken to mitigate the same. The experience gained during this FRS EMC compliance certification of the corDECT system will substantially reduce the cycle time in future products with better design margin. Emission and susceptibility requirements from Standard Institutes to meet the Regulatory Authorities are also outlined.