CHAPTER 3: FIELD APPLICATIONS
3-4
DigiVu
®
Series Multichannel MPEG-2/H.264 Encoder/Multiplexer with QAM &/or IP Output - Installation & Operation Manual
3.4.3 Insertion Into Locally Deleted QAM
The DigiVu CD product can be used to insert local programming into an EIA channel where the cable system carries a
channel but providing customers with the programming on that channel is discretionary. In this scenario, a system EIA channel
is deleted using an optional channel deletion filter with very good adjacent channel performance and deep rejection of the
intended deletion channel. This filter is available from ATX Networks and is an integral part of the design of the DigiVu CD.
In this case, the DigiVu CD will create a totally new QAM channel and insert it into the blank spectrum following the output of
the filter.
3.5 Insertion Into Under-utilized QAM (Add/Drop)
3.5.1 Locally Add/Drop Programs in a QAM
The DigiVu CD can be used to insert local programming into the actual data stream of a QAM by dropping specific programs
from an existing QAM channel and replacing them with local content. This application requires optional DEMOD Card and
Channel Deletion Filter. In this application, the original system EIA channel is filtered out and a new QAM channel inserted
Figure 3-3: DigiVu
®
CD - Insertion into Locally Deleted QAM
Figure 3-4:
Locally Add/Drop Programs in a QAM
