A digital signal recording device or a digital signal recording and playback device which receives an inputted digital signal having a predetermined packet format and including a digital video signal and a digital audio signal. An exercise apparatus for fully figured individuals configured to provide at least 432 square inches of surface seating area. A speed change transmission is disposed in an enlarged region of the housing that extends substantially perpendicularly with respect to the axles. The predetermined time period corresponds with an estimated roundtrip propagation delay of the first pulse when the first pulse is reflected back to the cable testing system after traveling a first predetermined distance along the cable.