On my 2012 its on the "non-door" side near the water connections. IIRC Cable/Satelite prep was included with "technology package" on my trailer.
In 2010 Jayco still made Jayflight and JayFlight G2. From what I have learned here the G2 included a lot of options that are now standard on the combined JayFlight line of today. Not sure is external cable connection was one of those options...might be worth a call to Jayco. With you VIN number they can provide lots of useful information.
2007 Chevy Duramax LMM/Allison
2012 Jay Flight 29QBH
2012 Jay Flight 26BH (Sold)