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  • 1- PDH

    2- SDH

    3- Modulation

    4- E1

    5- STM1

    6- Multipath fading

    7- Atmospheric losses(Tipuri de interferente cauzate de vreme rea ( ploaie), obstacole)

    8- Protection types (hot standby, single, space diversity, SNCP, MSP)

    9- BER (bit error rate) , SES, ES

    10- RX level