Cyberwatch Security Communication Systems, Inc.

Wireless Systems

 

Wireless data and telecommunication systems find the most applicable deployments in the installation of the Digital CCTV systems for physical infrastructure protection and mobile video recording applications. The advances in the IEEE 802.11 standard and availability of the 2.4GHz, 5.0 GHz and the Public Safety Band at 4.9GHz has enabled the wireless equipment manufacturers to target the Digital CCTV systems as one of the most important vertical markets for these wireless systems.

In the mobile applications, the higher bandwidth of the 3G Cellular Networks and the availability of mobility management and radio resource management in the Cellular Networks are enabling technologies for Mobile CCTV applications. These are perfect for utilization of mobile digital CCTV deployments such as camera installation and video recording in transportation vehicles. The wireless systems in the Digital CCTV applications can be organized to following segments:

1. 802.11 based systems:

a. Enterprise class based WiFi access points on the 802.11 a/b/g/n standard for installation at the edge of the CCTV networks provide the monitoring stations and video termination points with wireless capabilities. These links must to be secured with WEP, WPA-PSK and AES ciphering methods. Cyberwatch recommend addition of either of SHA1/3DES, or Secure Socket Layer security from the source of the video transmission to the termination points at the storage systems and viewing system. This provides multiple layer of security both at the OTA (Over The Air) traffic and network and transaction layer traffic.

b. Wireless Mesh routers for the backhaul interface of the Digital CCTV networks. These systems are based on the 802.11a standard either on 5.0GHz bands or 4.9GHz and can provide aggregate backhaul interfaces between different subnets or the LAN segments on the IP based CCTV networks. In a complex multi-site IP based CCTV system designs with proper traffic engineering the data paths between different systems can be partitioned either with VLAN tags, or to different subnets using Layer-2/3 switches and Gateway systems.

 

 

2. Cellular networks

The widely used application of the Cellular networks in Digital CCTV systems has been for transportation systems operated by the local cities or local port authorities. The 3G networks in US and Europe have been used for transmission of the video streams from transportation vehicles to a control center for monitoring and response to an event. There are also systems designed based on the hybrid approaches of both cellular systems and WiFi systems. In this case, the transportation system will use the cellular network for transmitting the video when the unit is mobile or away from the control center, and will use the WiFi connection when at the control center to connect the Local Area Network. The system will then use the wireless Local Area Network to upload the recorded video to the control servers, which has been stored locally on the DVR/NVR system of the transportation vehicle.

3. Narrow Band Satellite systems

The narrow band channels of the Low Earth Orbit (LEO) or Medium Earth Orbit (MEO) satellite systems can be used for sending alarm and event messages from the digital CCTV system out to the Wide Area Networks. These applications are practical for remote Digital CCTV installations where the connection to the Internet is not available and a Satellite data terminal is the cost effective connection to the telecommunication infrastructure.

Please contact Cyberwatch regarding your design and applications, and the best solutions provided in the Digital CCTV industry.

 

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