For mission critical applications, you may seek so-called “five nines” availability, which represents an uptime of 99.999%. This level reflects a five-minute downtime over the course of a year, and there are associated costs for this high availability. For other scenarios, 99.99% — or 52 minutes of annual downtime — may suffice. In any case, open-based digital systems offer far higher reliability than DVRs, which may be offline eight hours or more per year. Whatever your network situation, consider the four strategies that follow:

Outsourcing
High-end customers that can’t afford downtime often choose an outsourcing strategy to ensure servers and networks remain up. There are two approaches to ensuring the highest levels of availability.  You can outsource the network structure to a co-location provider or build it and maintain it yourself. Using co-location providers, which have been around for more than 10 years, is generally accepted to be a more cost-effective approach. Co-location providers operate physically secure buildings with redundant capabilities (Internet connections, power, etc).

These hardened facilities monitor the network 24x7 using advanced software tools and highly trained staff. Providers implement Border Gate Protocol 4 (BGP4) protocols to make routing decisions based on path, network policies and/or rule sets. The bottom line is that by outsourcing network infrastructure to the pros, you can obtain the highest level of availability without having to deal with networking hassles.

Isolating staff from equipment
If you house your own networking equipment, physically separating gear from employees is critical in ensuring network uptime. I recall one customer, who told me his firm suffered outages every night. Using a network video camera trained on its equipment, he discovered that cleaning crews were unplugging the router so they could use the outlet for a vacuum cleaner. Another healthcare customer discovered that his staff was using the network closet as a break room. Restricting access to these areas will eliminate unintended incidents. Beyond physical security, ensure that you implement the proper computer security. Implement firewalls to protect the integrity of the system. For wireless systems, ensure you set up WEP or WPA encryption for the routers. In addition, use Secure Sockets Layer (SSL) encryption techniques to protect data to protect against those trying to sniff your network. Finally, use uninterruptable power supplies (UPS) for all networking gear. The large majority of power outages are of short duration, so these can protect against almost all power incidents.

Redundant networks
When I worked at SunGard Availability Services, a business continuity provider, we had to pay attention to common problems that interfered with network up-time. Interestingly, it was often low-tech problems, like a backhoe cutting a network line while digging a trench, that cropped up. Such examples point to the need for redundant paths for the data to travel. In a sense, you want to create a circle, so that if one path is cut, the network can repair itself and go in the other direction.

Further, it’s safest not to send all data to a central repository immediately. Some of the largest commercial companies and government agencies have the network set up to move data from distributed cameras to a regional center for storage and then trickle up to a central location. Thus, if the network drops, they have data in several spots (something you can’t do in the analog world.) With network video systems, you can have redundant servers, storage and routers (Layer 3) using Hot Standby Router Protocol (HSRP). For outdoor wireless environments, you may set up a wireless mesh network that provides for self-repairing nodes for reliability and redundancy.

Store data at the edge
The final strategy includes storing video data at the edge – in this case the network camera. In this way, if the network fails, the local camera can continue to store images locally. During that critical time, network cameras will still operate, taking pictures and storing them. One caveat —this isn’t a fully developed strategy yet. Today, if you want to access the data, either you must take out the SD card physically and read the data on a computer, or you must log in directly to the network camera.  Video management systems will typically not see this edge data as part of their security database. Still, that is better than not recording and storing while an incident occurs. In the future, video management software companies will provide an automated system so that when connectivity is re-established, the software will pull stored images into the network so you have a full library.

Whether you require a “five nines” strategy or something less stringent, using these strategies will ensure that customers not only have an outstanding setup, but can successfully record, store and access important video data in case of human, equipment or environmental failures.