The HyperLink AL-VDP11228AW protector is designed to provide superior lightning and surge protection for analog PTZ video cameras. These protectors incorporate individual protection circuits for the analog video line, RS-485 control line and 12-28VAC power lines. All housed in one NEMA rated weatherproof enclosure.Analog Video LineThe video protection circuit is designed to protect 75 Ohm coaxial video lines connected to the AL-VDP11228AW 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. This model features isolated BNC connectors and cable shields for equipment or installations prone to ground loops. A Gas Discharge Tube is connected between the coaxial shield and the unit's ground terminal. Right angle BNC connectors provide easy hookup of the video lines.RS-485 Control LineA 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.12-24VAC Power LinesThe 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 DesignThese 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.For mounting to masts up to 2 inches in diameter, the HGX-PMT25 mast mounting kit is available (sold separately).For additional information and complete specifications, click on the data sheet link below.