A.兩個子網(wǎng)的接入網(wǎng)元和網(wǎng)關(guān)通過交換機(jī)相連 B.兩個子網(wǎng)的接入網(wǎng)元通過SEIA網(wǎng)口相連 C.兩個子網(wǎng)的接入網(wǎng)元通過SPWA光口相連 D.兩個子網(wǎng)的接入網(wǎng)元通過SOSC光口相連
A.0dBm B.-3dBm C.-9dBm D.-14dBm
A.-9dBm B.-14dBm C.-18dBm D.-21dBm