Western Digital 4CH TRIPLEX - Manual (Page 12)

2-3. Rear View
A. CAMERA INPUT
BNC Input Connectors for camera
B. LOOPBACK OUTPUT
BNC Loop-back Output Connectors for cameras
C. AUDIO IN
RCA Audio Input Terminals
D. AUDIO OUT
RCA Audio Output Terminal
E. VIDEO OUT
BNC Monitor Out Connector
F. S-VHS
S-VHS Monitor Out Connector
G. RS-232C
Connector for DVR Control and Upgrade
H. RS-485
Camera Control
I. USB PORT
J. NTSC/PAL SWITCH
K. ALARM OUT
L. POWER FAN
M. SENSOR IN (Power input: DC 10~12V)
N. POWER IN
O. 10 BASE T ETHERNET
Connector for Network Connection
12