Cisco Model D-PCG1000 PowerKEY CAS Gateway Installation Guide
Chapter 1 Introducing the DAVIC QPSK Demodulator
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The QPSK Demodulator and the QPSK Modulator
Introduction
This section describes how the QPSK demodulator and the QPSK modulator receive
and transfer data. The following table and illustration show this process.
Communication Path
The QPSK demodulator and QPSK modulator combine to create a DAVIC-compliant
headend QPSK signaling hub. The following table illustrates this process.
From
To
Data
QPSK demodulator
QPSK modulator
SMC Responses
Application data
MAC status data
MAC calibration requests
QPSK modulator
QPSK demodulator
Embedded 3 ms reference
SMC provisioning data
SMC status requests
Communication Diagram
The following diagram illustrates the QPSK communication path.