EMI(전자파간섭)은 전기/전자제품의 이상동작을 야기할수 있는 장치로부터 방사되는 10KHz에서 3GHz대역의 전자파를 말한다. 본 연구에서는 안정적이고 정상적인 동작을 위해 2.5Gbps SDH시스템에서 전자파발생원인 STGU유니트에 대하여 전자파간섭을 시뮬레이션하였으며 On-Site Test를 통하여 조화주파수에 대한 전자파 세기를 측정하였다. 또한 소자들간의 EMI를 최소화하기 위하여 2GHz의 Cut-off주파수에서 저역통과필터를 설계하였다. 저역통과필터를 STGU유니트에 적용한 결과 전자파는 약 20dBm이상 감소되었으며 동기기준클럭의 품질을 결정하는 TIE와 MTIE를 측정한 결과 ITU-T G8l3을 만족하였다.
EMI(Electromagnetic Interface) is a measure of electomagnetic radiation from equipment in the range of 10KHz to 3GHz, and can cause unexpected reactions of electronics/electrical equipment. In this study, for safe and stable communication operation, a STGU(System Timing Genetation Unit), which is a 2.5Gbps SDH System and a major EMI source, was employed to simulate electromagnetic interface. In On-Site test, the power of fundamental frequency of EMI of interest and its harmonics were measured. Also, a low pass filter at cut-off frequency of 2GHz was specifically designed to minimize the effect of EMI between electronic components. When the low pass filter was implemented within the STGU, the power of EMI decreased more than 20dBm. Finally, when TIE and MTIE, two important quality measure in synchronous reference clcok, was assessed, ITU-T G8l3 requirements are satisfied.
