User manual

DTS Broadcast PDH Microwave Digital Radio User Manual
-13-
Figure 2-17 Block diagram of the QPSK modulator
The demodulator of QPSK modem in IDU has functions list below: See Figure 2-18.
70MHz IF AGC
Carrier Recovery and Derotator Loop
Timing Recovery
Nyquist Root and Interpolation Filters
FEC Modes
I/Q demodulater with 70MHz IF signal
PLL module with 70MHz for demodulate
Figure 2-18 Block diagram of the QPSK demodulator
The 4/8/16E1 Service pulg-in card in IDU has functions detailed in Figure 2-19.