System Overview
Diagram of Cisco’s Overlay Solution
The GoQAM is an integral component of the 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 assumes that a PowerKEY DBDS network will be “laid over” an
existing but different cable network.
Important! The GoQAM is supported in SR 2.5/SR 3.5 (or later).
Depending on the system architecture, the GoQAM can be used in either headends
or hubs. The following illustrations are examples of typical Overlay environment
setups.
Overlay Environment Without a Multiplexer With an IRT
In an Overlay environment without a multiplexer (MUX), the Integrated Receiver
Transcoder (IRT) does the encryption for the non-Cisco set-tops.
The following graphic illustrates how Overlay technology interfaces to a non-Cisco
headend that uses a simple IRT. The IRT performs a number of functions including
Mediacipher encryption. With an IRT, clear and encrypted signals are available
through DHEI connectors on the IRT back panel.
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General