NEC NHD-3000PVR - Manual (Page 11)

Service Port
A/V Output
9
Rear Panel Connectors (Cont.) 04
Controls
The service port is for maintenance and software upgrade in the future.
The ‘A/V output’ consists of the followings :
Y, Pb, Pr : Component video output (576i, 576p, 720p, 1080i)
RGB/HV : RGB, PC monitor output (576p, 720p, 1080i)
HDMI/DVI : HDMI/DVI output (576p, 720p, 1080i)
Video or S-Video : Composite video or S-Video output (576i)
L, R : Analog audio output
COAXIAL : Digital audio output (Coaxial)
OPTICAL : Digital audio output (Optical)