Analog Video Line
The video protection circuit is designed to protect 75 Ohm coaxial video lines connected to the AL-VDP01228AW via its BNC connectors. This circuit utilizes an avalanche diode in concert with a low capacitance diode array. This design minimizes capacitive loading of the line and provides improved frequency response over competitor's models. The AL-VDP01228AW connects the coaxial cable shield to the unit's ground terminal. Right angle BNC connectors provide easy hookup of the video lines.
RS-485 Control Line
A high power 3-stage design is used to provide protection for the PTZ camera's RS-485 control line. The 3-stage design can handle higher-level transients than a protector that uses only diodes. The first stage is comprised of a differential gas discharge tube. Stage two is a pair of current limiting series resistors and the final stage is a low capacitance diode array. The RS-485 control line is connected to the protector via its screw terminal blocks. The terminal blocks are removable to ease wiring.
12-28VAC Power Lines
The PTZ camera's power lines are also protected using a 3-stage design. This provides superior protection from transients and surges. The first stage is comprised of a differential gas discharge tube. Stage two is a pair of suppression coils and the final stage is a Metal Oxide Varistor (MOV). Power lines are connected to the protector via high current rated screw terminals.
Weatherproof Design
These units feature a weatherproof ABS enclosure with gasketed cover and concealed mounting holes. Water tight cable glands provide entry and exit points for cables. A ground clamp on the enclosure's exterior provides a tie point for earth ground.
