11 months ago


Security Alarm Simple &

Security Alarm Simple & Easy Installation Integrated Security - Access Control Access Control Automation No Software Required Inception is an integrated access control and security alarm system with a design edge that sets it apart from the pack. Featuring built in web based software, the Inception system is simple to access using a web browser on a Computer, Tablet or Smartphone. With a step by step commissioning guide and outstanding user interface, Inception is easy to install and very easy to operate. DESIGNED Multiple Devices Easy Setup with Checklist Prompting IN A U ST R A R LIA For more information, visit T: 0845 470 5000 E: W: Send IP Alarms via the Multipath-IP Network When the Power Goes Off Keep your Business Critical Equipment Running NEMESIS N90 (1000VA) N180 (2000VA) N270 (3000VA) TALOS T25 (450VA) T36 (650VA) T50 (850VA) T60 (1000VA) T90 (1500VA) T120 (2000VA) Visit the product selector Call now for more information: 01772 336111

NETWORKING Beat bandwidth bottlenecks The amount of data being generated in modern surveillance systems is increasing all of the time especially with higher resolution cameras continually coming to the market. What is the impact of high rates of data on bandwith and what can be done to improve performance? IP CCTV systems transmit vast amounts of video data over networks. Video data is continually transmitted between the IP cameras, processing servers and storage devices. It includes live viewing, reviewing and recording, as well as data used for network system communications. As the camera count in a system increases, so too does the amount of data being transmitted, creating network bandwidth bottlenecks. This has an adverse impact on the efficiency of the CCTV system, causing it to underperform. Paul Scott, Technical Director at the Security Buying Group, explains to PSI what the common network bandwidth restrictions encountered in IP CCTV systems are and explores how a welldesigned, IT infrastructure and deployment, using an intelligent video management software (VMS) solution, can contribute to reducing negative bandwidth effects and dramatically increase system performance for users. System bandwidth The system bandwidth requirements of an IP CCTV system are easy to calculate and can be split into three prime categories: 1. Camera live viewing bandwidth. This is the total bandwidth required for live camera viewing and is typically assumed to be D1 resolution, as viewing is usually in multi-screen formats. A calculator suggests a "worst case" figure based on a fully unicast system: one where every camera in the system will be viewed simultaneously by a combination of clients. In real applications, this amount of traffic is rarely so high. 2. Recording bandwidth. This is the total bandwidth required for the camera video recording streams. A typical 2MP IP camera, operating in real-time (25 IPS) and producing good quality video, generates around 3 Megabits of data per second (Mbps). 3. Client reviewing bandwidth. This is the total bandwidth needed by each client when reviewing the system. It assumes concurrent live display and play back of HD video from multiple cameras. Each client viewing the IP CCTV system, from a PC or central monitoring position, will typically demand 30Mbps of data. The total system bandwidth comprises the sum of all three bandwidth types. As an example, a system of 100 x 2MP cameras operating in real-time (25FPS) for 31 days and viewed by four concurrent clients would demand the following: • Camera live viewing bandwidth = 100Mbps • Recording bandwidth = 300Mbps • Client reviewing bandwidth: 4 x Clients (max 30Mbps each) = 120Mbps Total system network bandwidth requirement is 520 Mbps. Total required storage is therefore (approximately) 100TB. Bandwidth usage A network does not reserve 100% of its available bandwidth for video data. Some bandwidth is required for protocol and communication demands. As a result, a Gigabit connection will normally offer just over 90% of its bandwidth for the actual data payload. Most networks use copper Ethernet cabling, capable of transmitting up to 1 Gigabit of data per second (Gbps) or 1000 Megabits per second (Mbps). Using the example system above, bandwidth usage would be nearly 60% of what is available. If the system uses variable bit rate (VBR) compression, to ensure the best detail and quality, the actual bandwidth requirement will feature peaks and troughs of higher and lower bandwidth demand. Ethernet cables and connections The simplest way to reduce bandwidth bottlenecks is to create more routes, larger capacity routes, or alternative routes for data within the network but also in creating different networks for different purposes. When it comes to Ethernet connectivity then the more available NIC ports the better, allowing teaming and virtual LAN (VLAN) support. VLANs offer a good method of segregating video traffic so that all data is not transmitted across the entire network. For instance, separate VLANs can be used for recording traffic, live A network does not reserve 100% of its available bandwidth for video data. Some bandwidth is required for protocol and communication demands 37

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