hi,all

   I am modeling signal in DVB using SID. In head-end of DVB , the equipments firstly receive Signal (e.g. TransportStream ) from outside system, then processes(composes, decodes, multiplexes, modulate,mix etc) it, and then generates a new signal and  transport to HFC, and last transport to Home STB.

      My question is  :

      Should  the signal be classified to Resource Domain Or Service Domain? Or just a relationship between the two domain?

thanks in advance

liucg