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CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier® Revision 7

Introduction MN/CDMQx.IOM

1–4

• A Demodulator card performs all of the signal processing functions of carrier search,

cancellation, demodulation, Forward Error Correction, the de-framer, plesiochronous/

Doppler buffer and the receive interface circuits.

• Terrestrial data interface cards can be on the modulator cards or demodulator cards.

When a modulator and demodulator are grouped together, the data interface card can be

used for full-duplex data interface. When one or up to four ports of E1 (with D&I) are

needed, the Quad E1 Data Interface Module can be installed in Slots 3 and 4.

Figure 1-2

shows a functional block diagram of the modem with either modulators and

demodulators in all four slots; and the figure also shows a modulator in Slot 1 and a demodulator in

Slot 2 along with a Quad E1 Data Interface Module in Slots 3 and 4.

Figure 1-2. CDM-Qx/QxL Open Network Satellite Modem Block Diagrams

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 259 260

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