The ir code set transmission has not changed since the inception of the directivo boxes for directv. I have several jobs with multiple monitors in the same room (8 on one job) with 8 discrete code sets. As I have transitioned this job to HD over the last 3 years there are now 5 HD and 3 SD boxes in the same room and after assigning the remote code set to the new boxes the codes programmed into the the TSU7000 work without a hitch. This comment is limited to DirectTIVO boxes and includes HR10-250.