Contemporary Research 9 QMOD-SDI
Inserting a QMOD channel that emulates a Cable Guide Channel
This is a solution that we’ve employed for Comcast applications; we’ll add verification for other cable
systems as they arise.
In the case of Comcast, the receiver’s internal “map” shows the Guide how to match up physical channels
and the specific Program carried by each QAM digital stream. Unlike a TV tuner, a cable box doesn’t care
about the virtual ID of a specific channel and program, such as 98-315. A channel in the Guide would point
to the physical channel 98 and a program that has an ID of 315.
Starting with Version 5.7 firmware, you can change the Program Number to match the ID the Guide is
looking for.
The integration process would proceed as follows:
This solution is aimed at a site that wants to insert just a few programs into a site that has cable
boxes feeding all TVs, and they won’t or can’t do this any other way.
First, work with the cable provider and have them block one of the current channels that minimally
affect key cable channels at the site.
Next, the cable company would detail the following
o A suggested Guide channel that access that physical channel
o The Program number that channel is mapped to
o The RF Level needed to merge your QMOD channel into the cable RF feed
o Providing an input for the inserted RF channel
You may have to purchase your own channel block filter (this can be expensive), but in larger sites,
it’s better to have the cable provider handle the insertion process.
Set the QMOD to the required physical channel (in this example, 98)
Set the Program Number to 315
You can leave the CVCT (Virtual Channel Table) off, and the front panel would state “98-315”
To see the QMOD channel, users would the Guide channel mapped to that channel and Program #.
Again, the cable box ignores virtual channel information. If you have other tuners or TVs tuned to
channel 98, they will generally display the channel as 98-315. A few TVs may ignore Program
Number and show the channel as 98-1.
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