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Building Automation

Industrial Wireless Application Guidebook - 19677 Community Security System

System Diagram

Background Solution Description

Cities are installing more and more CCTV (closed-circuit television) surveillance systems to combat crime and ensure the safety of their communities. Previously, CCTV systems relied upon analog video cameras and wiring that were cumbersome to implement and maintain. The introduction of IP (internet protocol) video technology has also made the digital encoding and transfer of video faster and easier. In addition, modern video surveillance technology is not only capable of transferring video images over wired Internet and Ethernet networks, but over wireless networks as well. Using wireless technology can reduce maintenance effort and increase deployment flexibility, making it an attractive option for communities that wish to install CCTV security systems. A city wanted to implement a wireless surveillance system for one its communities according to the following requirements. Each IP camera in the surveillance system needs to be connected to the wireless network via an access point. To ensure successful communication in different directions, two access points can be installed in each surveillance corner. In addition to the AWK-3121-T, Moxa’s wireless solutions include AWK-4121 wireless access points with IP67-rated housing to prevent water and dust from getting inside the device. The AWK access points’ detachable antennas also provide more flexibility for high-gain directional antennas. Furthermore, the AWK-3121-T and AWK-4121 are pole and wall mountable for easy installation and offer PoE (power over Ethernet) support for a centralized power supply. Since there are many wireless 2.4 GHz band access points already installed throughout the city, setting the surveillance systems’ access points to IEEE 802.1a mode (5 GHz) can avoid interference and leave room for more bandwidth. Each camera uses around 1-2 Mbps of bandwidth so it is best to limit each system to 10 cameras to ensure the best video quality. If there are more then 10 cameras in a given system, it may be necessary to separate the cameras into 2 or more wireless systems to ensure optimum performance.

Benefits

• IEEE 802.11a support • Wide operating temperature • QoS support
Building Automation IP CameraVPort 25 Community Security System

Application Requirements

oo m • Water and dust protection for outdoor use
G u a r d r • Flexibility for high-gain directional antennas • Operation at the 5 GHz radio band to avoid radio interference • Easy installation • Centralized power supply

RecommendedProducts

Directional Antenna, 12 dBi

AWK-3121-T

Industrial-strength IEEE 802.11a/b/g wireless AP/bridge/client, -40 to 75°C operating temperature

AWK-4121

IP67-rated, IEEE 802.11a/b/g outdoor wireless AP/bridge/client, -40 to 75°C operating temperature
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