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Current IP camera security system installation uses standard Cat-6 as the link cable, transmiting only up to 100
meters far. Now our VDS4020 offers a more convenient and reliable solution for IP Network cameras. It transmits
IP signals up to 800 meters to the Local side and also supplies DC power simply through one coaxial cable and
PoE powering IP camera, PoE can be achieved SNMP management capabilities.
1. Look upon VDS4020-R (Sender) as PSE and IP cameras as PD.
2. PoE integrates data and power on the same wires
3. Simplified installation work, saves time and money.
4. Complies with IEEE802.3af, class 0 (include 1-4)
Fig. 1 VDS4020 RU / LU, and Power Adaptor
Introduction
The VDS4020 is a pair consisting of a Remote Unit and a Local Unit connected via coaxial cable (RG-6/U, 5C-2V or
equivalents). The Remote Unit (RU; the “Transmitter"; the Sender) is placed at the IP camera end, and the Local
Unit (LU; the "Receiver"; the Viewer) is placed at the NVR/DVR end. The downlink IP packets (typically compressed
video data) from the camera are modulated at the RU and transmitted"downstream" to the LU over the COAX
connection. The uplink IP packets (PTZ control signals, etc.) from the NVR/DVR are modulated at the LU and trans-
mitted "upstream" to the RU through the COAX.
The coaxial cable that sends IP packets upstream or downstream also serves as a path to supply power. The LU
accepts 48V DC power, which will be sent to the RU through COAX after passing the safe power transmission
controller. The RU then converts the power to the voltage that cameras use.
Safe power transmission is a very important function. The safe power transmission controller checks 48V DC first.
The power will be transmitted only after the LU and the RU are confirmed to be correctly connected. Thus, it pre-
vents any danger caused by the misconnection of the coaxial cable.
Be sure to use the coaxial cable with the impedance of 75 ohms. COAX of RG-6/U, 5C-2V or equivalents is rec-
ommended. Please avoid using RG-59/U because its core is copper clad steel, which has great DC resistance and
affects the DC power transmission. For long distance transmission, RG-11/U or 7C-2V is a great alternative. The
low DC resistance of either COAX reduces the consumption and makes it possible to transmit the power over
1,000 meters.
Connection Diagram
The following illustration gives an
overview of how the Sender and
the
Viewer connect. Please note that
the coaxial cable should always be
connected to the LINK OUT side of
the Sender.
