Problem: I wanted a DVR but did not want to rent a box from RCN
Cable company: RCN Chicago.
Bought a Motorola DCH-3416
Had RCN install a cable card (M-Card)
The first card did not work. The box said invalid card.
Got them to come out again. Tried a few other cards. It now works. Full HD with recording capabilities for the cost of the cable card ($1.50/mo)
Hint: To get into the settings, turn off the box. Hit the OK button 2 to 3 times you should get into the system.
Manual: search online, there are .pdfs