L-com, Inc. 50 High St., West Mill, 3

rd Floor, Suite #30 North Andover, MA 01845

www.L-com.com E-mail: sales@L-com.com Phone: 1-800-343-1455 Fax: 1-978-689-9484

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HyperLink Brand Weatherproof PTZ Camera Lightning and Surge Protector

Model: AL-VDP Series

Applications

•

Pan-Tilt-Zoom (PTZ) analog video cameras

Features

•

Individual protection circuits for analog video line, RS485

control lines and power lines

•

3-Stage protection provided for RS-485 and power lines

•

Video circuit available in isolated or grounded

versions

•

Available in AC or DC versions

•

NEMA rated enclosure with gasketed cover and

concealed mounting holes

Description

The HyperLink AL-VDP series are 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 AC/DC power lines. All housed in one NEMA rated weatherproof enclosure.

Analog Video Line

The video protection circuit is designed to protect 75 Ohm coaxial video lines connected to the AL-VDP 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-VDP0xxx series connects the coaxial cable shield to the unit’s ground terminal. The AL-VDP1xxx series offers

isolated BNC connectors and cable shields for equipment or installations prone to ground loops. The AL-VDP1xxx

series features a Gas Discharge Tube 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 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 use of three terminal differential gas discharge tubes provides superior common and

differential mode protection against conducted transients versus the use of lower cost two terminal tubes. The

second stage series resistance limits the power dissipation of the fast diode clamp array in the third stage. This

allows time for the slower but higher power gas tubes to flash over. The diode array clamps the leading edge of

fast transients to safe levels until the high power gas tubes turn on. This eliminates the damaging leading edge