About This Guide
Introduction
This guide describes both the intermediate frequency (IF) Gigabit Overlay
Quadrature Amplitude Modulation (GoQAM) modulator and the radio frequency
(RF) GoQAM.
Note: In this guide, the GoQAM modulator is referred to as the GoQAM.
The RF GoQAM is a software-modified Model D9479-1 Gigabit QAM (GQAM)
Modulator. The Model D9479-3 IF GoQAM is similar to the RF GoQAM, but has IF
outputs in lieu of RF outputs, as well as a different back panel. Both are integral
components of Cisco Overlay solution. The Overlay solution uses Digital Broadband
Delivery System (DBDS) technology to create a network in which different
conditional access (CA) systems can coexist in a coherent manner. Overlay
technology allows a PowerKEY
®
DBDS network to be “laid over” an existing cable
network that uses a different CA system.
Important: The GoQAM requires System Release (SR) 2.5/SR 3.5 (or later) with the
Overlay feature enabled.
Purpose
This guide provides detailed specifications and component descriptions for the
GoQAM and how the GoQAM functions in Cisco’s Overlay solution. This guide also
includes all of the procedures that enable you to install, provision, and operate the
GoQAM within your cable network. Call center personnel can use this guide to
assist them with common troubleshooting procedures.
Scope
This guide includes the following topics:
Descriptions of GoQAM functions
Descriptions of GoQAM components
Installation procedures
Operation procedures
Troubleshooting guidelines
Customer information
IF and RF GoQAM technical specifications
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General