Cisco Headend System Release i4.3 Guida Utente
DREDD Data Transport
4022451 Rev D
3
DREDD Data Transport
Introduction
Various data transport mechanisms are used to provide set-tops with network and
server security.
server security.
Trickle-Feed Filtering
One approach to set-top security is to sort EPG data using a "trickle-feed" filtering
strategy by maintaining filter values in hardware registers. Data that matches the
filter values is kept and the remaining data is discarded.
strategy by maintaining filter values in hardware registers. Data that matches the
filter values is kept and the remaining data is discarded.
File-Based Filtering
Instead of using the trickle-feed strategy, our set-tops use a file-based filtering
mechanism. The DREDD process aggregates the EPG data stream into a file format
that can be placed on the BFS carousel subsystem for consumption by set-tops and
CableCARD hosts running GuideWorks' iGuide client application.
mechanism. The DREDD process aggregates the EPG data stream into a file format
that can be placed on the BFS carousel subsystem for consumption by set-tops and
CableCARD hosts running GuideWorks' iGuide client application.
This enables us to provide iGuide support on our set-top boxes. Depending on the
available bandwidth of the BFS carousel, we can support both the SA Resident
Application interactive program guide (IPG) and the GuideWorks electronic
programming guide (EPG) at the same time on the ISDS or DNCS.
available bandwidth of the BFS carousel, we can support both the SA Resident
Application interactive program guide (IPG) and the GuideWorks electronic
programming guide (EPG) at the same time on the ISDS or DNCS.
DREDD Data Transport Process
The DREDD proxy server transfers TV Guide Interactive Back Office (IBO) data
including reduction, configuration, and hardware filter values from the TV Guide
Reduction Data Management (RDM) System to a TV Guide-managed FTP server.
including reduction, configuration, and hardware filter values from the TV Guide
Reduction Data Management (RDM) System to a TV Guide-managed FTP server.
Download servers take the data from the FTP server to the BFS, which distributes
hardware filter values to set-tops. The filter values are used to sort and accept or
discard EPG data.
hardware filter values to set-tops. The filter values are used to sort and accept or
discard EPG data.
The DREDD transport scenario is illustrated below in the following illustration of
the DREDD File-based Filtering Process.
the DREDD File-based Filtering Process.