In large IP Surveillance networks, or a metro-area network, the video surveillance system is typically overlaid on an infrastructure that has been designed to carry multiple applications and services. Such a network, supporting a significant number of end-users, needs to be very reliable, manageable and scalable. These requirements are best met by a network design in which different services are partitioned into separate VLANs and transported over resilient rings that are protected by an extremely fast failover mechanism.

Example Scenario

A large Town Center shopping and entertainment district spans multiple buildings, spread across a campus that requires a highly resilient, reliable, secure and high performance network. A campus consisting of four buildings would require 12-16 cameras on each floor of a typical four-story building. Many cameras would be installed inside buildings, with some installed outside to monitor the entrances. The physical layout of this site would be large, so cameras on each floor would be connected to switches located on each floor. Every switch on each floor would be connected to another switch, creating a stackable solution that can be managed by a single IP address. These Power over Ethernet Plus (PoE+) switches would be connected to a modular Layer 3 switch, providing a highly resilient, secure and easy-to-manage network.


The Allied Telesis SwitchBlade® x908 is an advanced Layer 3+ modular switch for the modern enterprise network core where resiliency, reliability and high performance are the key requirements. Allied Telesis x510 Series advanced Gigabit Ethernet Layer 3+ stackable switches support PoE+. The SwitchBlade x908 provides port and speed flexibility by using expansion modules (XEMs), which are all hot-swappable allowing maintenance and reconfiguration of the network without affecting networking uptime. Ethernet Protection Switched Ring (EPSRing™) allows the SwitchBlade x908 — with a number of x510 switches — to form a protected ring with 50ms failover that is perfect for high performance at the core of the Enterprise network.

Allied Telesis Virtual Chassis Stacking (VCStack™) provides excellent resiliency by allowing the creation of a single “virtual chassis” from multiple physical devices. It allows management of the stack as a single node on the network, greatly simplifying management tasks. Comprehensive low-latency wirespeed QoS provides flow-based traffic management with full classification, prioritization, traffic shaping and min/max bandwidth profiles.