December 2015

New Video Redundancy Technology Is a Game Changer

Often, a network’s Achilles’ heel is a too slow recovery of lost video transmission. Needless to say, for mission-critical surveillance, this shortcoming can lead to disastrous outcomes. Usually, engineers must go to great lengths—accumulating huge costs—to ensure seamless video transmission. All too often, underperforming fast recovery has been a network manager’s headache, especially when it comes to multicast streaming. Now, a new technology is available to help ensure nonstop video transmission—even on multiple-service networks.

Quest for Seamless Connectivity

Implementing ring topology and redundancy protocols on industrial networks is common practice, as star and tree topologies are prone to single-point-of-failure events. However, a typical industrial ring topology network, using Rapid Spanning Tree Protocol (RSTP), has the following limitations:

  • It delivers an underperforming recovery time of 2 to 5 seconds. Pointedly, it is a distressing performance that translates into the loss of 60 to 150 frames (assuming 30 frames per second) of surveillance images.

  • Even if a ring redundancy protocol is able to activate backup paths in a fraction of a second when a disconnection occurs, it could still take more than two minutes for a network’s multicast video streams to recover

  • A number of different protocols—including IGMP (Internet Group Management Control) and PIM-DM (Protocol Independent Multicast – Dense Mode) —are implemented to transmit video packets around the network, and these standard protocols are not designed for mission-critical applications.

Breakthrough Network Redundancy for Video Streams

Fortunately, there is good news for layer 3 network operators. A new technology called V-ON™ can ensure uninterrupted video transmission by achieving millisecond-level recovery on layer 3 networks.

This technology combines established proprietary Turbo Ring and Turbo Chain redundancy protocols with multicast routing optimization to achieve millisecond-level recovery. In addition, V-ON-supported Ethernet switches ensure the highest network availability to transmit data, voice, and even video over complex networks, such as those that support multicast streaming.

Networks and communities are already reaping the benefits of this new technology. A shining example can be found along a 22.4-kilometer tramline in a North African city. This success story showcases how V-ON™’s applied science optimizes a network by ensuring seamless and high-availability operation of multiple systems, including IP video surveillance, PA, and TETRA (Terrestrial Trunked Radio). Integrating 37 tram stops and 11 electrical substations, the tramway will link the eastern and western communities of this city.

To ensure continual transportation, the system will run multiple services between a centralized control room and numerous subsystems. Each station is equipped with 7 or 8 IP cameras, providing video message transmissions to a network video recorder (NVR), from where they are relayed to the control center. In order to deliver seamless video surveillance and nonstop services, the tramway’s network infrastructure must achieve a highly reliable performance and, therefore, calls for several system requirements. These requirements include: more than 250 IP cameras with a multicast stream across 40 VLANs; a multi-service network in which layer 2 nodes connect tram stops, and a layer 3 network is located in the control center; fast and reliable network redundancy specified at a 300 ms recovery time on layer 3 networks; and a redundancy protocol that supports both unicast and multicast streams.

Build a Video-Optimized Network

By providing its breakthrough V-ON™ technology that supports millisecond-level fast recovery technology to ensure seamless data transmission, along with a nonstop transportation service, Moxa is lining up this tramway on the track to success. With V-ON-enabled Moxa switches, the tramway company is able to build a network infrastructure that supports less than 300 ms recovery for both unicast and multicast streams on layer 2 and layer 3 networks. In terms of network details, Moxa helped the city build a dual-Gigabit Ethernet network, consisting of two chains (main and redundant networks), a 1G fiber-optic backbone and a 10G fiber-optic OCC (Operation Control Center) network. The design guarantees reliable multicast transmission, such as video streams across multiple VLANs, as well as comprehensive protection for the network. Furthermore, Moxa’s MXstudio network management suite provides for comprehensive life-cycle management, including configuration, operation, and maintenance, to help customers monitor the network system more efficiently.

For more information, download the complete success story or learn more about Moxa’s V-ON™ technology at this site.

 
 
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