Originally Posted by UtahPaul
I have a Motorola DCT3416 from Comcast. I just picked up a second box from Comcast to record lots of Olympics programming while the rest of the family is out of town. The new box, also from Motorola is RNG200N, another number on the bottom is DCX3501.
Just some additional information...
Actually, I believe that the RNG200N (aka DCX3501) is no longer actually manufactured by Motorola. It's been outsourced to Cisco and Pace, but conceptually it's still a DCX35* unit.
As Maggiefan explained, the real issue here is that the "device" code (needed for the remote in order to know what available set of functional coded IR flashes are recognized by the receiving device, and therefore have to be blasted out for each of the buttons on the remote) for the old DCT/DCH/DCX units (from Motorola) was 01376.
The instructions shown in that post do just that, converting the default "new" device code (which theoretically does not support the 30-second skip function, although we all know it does) implicit in your new remote back to being 01376 (like with your old silver remote, as well as a large number of remotes from Universal Electronics, etc.) so that all of the old programmable EFC function codes can also be installed... including the sought after 00173, which is the 30-second skip.
In other words, all remotes supporting device 01376 blast out the same set of IR flash codes designed for 01376 devices. The 30-second skip EFC 00173 is part of this set of supported codes for 01376 devices. The complete Motorola (or outsourced) family of cable boxes will respond to the 01376 set of IR codes even if the new RNG200N and matching remote is delivered with a different device code set by default. It's just a matter of programming your remote using the instructions above, to make it talk properly to a 01376-compatible device.