Hi.. Now I am able to look at the images that you uploaded..
Yours is a DVD player with 5.1 speakers. It is not a 5.1 speaker system or 5.1 home theater.. With this setup, you can connect audio out (not digital audio) from d2h set top box to Aux In of your DVD player. You can get 5.1 output from your DVD player using its inbuilt prologic function..