Talari Technology

Resilient Multipath Connectivity technology is how Talari's Adaptive Private Networking delivers end-to-end network reliability and protected application performance for both TCP-based applications and real-time applications like VoIP and videoconferencing. Powered by the rich information delivered by the continuous health monitoring preformed by the Talari appliances, it is what allows enterprises to reliably leverage "reasonable quality" networks—such as public Internet connections—even when such connections by themselves don't deliver the 99.95% to 99.99% reliability and packet delivery that a business expects from its WAN.

Resilient Multipath Connectivity provides multi-path multiplexing for both aggregating bandwidth and delivering end-to-end reliability, dynamically engineering around network trouble—not just outright link failure, but high packet loss or excess latency—as it occurs. It does stateful traffic steering via proprietary adaptive path selection algorithms, choosing the best path for each traffic type on a per packet basis. It can deliver greater individual flow performance by enabling packets, even from a single flow, to be striped across multiple network paths covering multiple WAN connections. It adapts to loss, latency and jitter "network events" within ~250 milliseconds for domestic connections, or ~500-600 milliseconds even for longer-distance international connections. This sub-second response is more than fast enough to handle any IP application that can run on an IP WAN, and so must be able to tolerate some amount of congestion-based jitter.

Resilient Multipath Connectivity makes the WAN look to each TCP application as if it were a zero-packet-loss WAN with the occasional bout of jitter—something TCP and TCP-based applications are designed to expect and accommodate without incident. In so doing, it delivers much higher link utilization without hurting flow "goodput".

For real-time applications like VoIP and videoconferencing, Resilient Multipath Connectivity uniquely delivers ultra-reliable, cost-effective support. It routinely chooses network paths with the least packet loss and lowest jitter for such high-priority real-time traffic. Just as for TCP-based applications, it rapidly recovers from any network loss, latency, jitter, or connection-failure event, switching the traffic with sub-second response to a better path.

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Enterprise-class Voice-over-IP (VoIP) and desktop video conferencing are challenging applications to run over a wide area network (WAN). End-to-end Quality of Service (QoS) must be provided to ensure that whenever congestion occurs, VoIP or video packets still get to where they need to go. In addition, there needs to be sufficient bandwidth to support the appropriate number of concurrent calls alongside other business applications on the network. With each call taking up 24 to 80Kbps of bandwidth, depending on the CODEC, it is easy to eat up a significant fraction of an expensive T1 MPLS circuit just with voice.

Talari's Adaptive Private Networking technology addresses the challenging requirements of voice in a number of ways.

• Bandwidth using APN is 30 to 100 times cheaper than private WAN bandwidth, so businesses can afford to provision much more bandwidth for any given application.
• An APN conduit between two sites can have up to 10 classes of service which allows VoIP packets to be assigned the appropriate priority relative to email or file transfers for instance. This guarantees that VoIP packets are not delayed in getting on to the WAN. To determine which traffic is VoIP and deserves real-time priority, Talari's Mercury APN appliances can be configured to honor DSCP markings and also can be configured to make this classification decision based on flow characteristics such as port number and/or source or destination IP address.
• At the start of a call, APN will automatically pick the path which currently has the best characteristics for a voice call (low loss, low jitter). Since APN continually monitors these characteristics of a path it can quickly reroute VoIP packets, within a fraction of a second, to a new path with minimum disruption in call quality.
• To offer the highest possible call quality it is possible to trade additional inexpensive bandwidth for "platinum" quality voice. By replicating voice packets over two disparate paths across the network, suppressing duplicates at the receiving appliance, the destination APN appliance will use the most timely of two VoIP packets and be able to hide packet loss or excessive delay on either of the paths.

For real-time applications like VoIP and videoconferencing, APN uniquely delivers ultra-reliable, cost-effective support. It routinely chooses network paths with the least packet loss and lowest jitter for such high-priority real-time traffic, and switches with sub-second response to a better path in the face of high loss or jitter delivering "platinum quality" connectivity.

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Talari Networks makes it easy to increase bandwidth. In fact you can easily and affordably expand your WAN bandwidth by 10 to 20 times. Using Talari's Adaptive Private Networking (APN) technology, you can immediately increase usable, reliable bandwidth to your private WAN for remote sites by leveraging Internet links that today are only used as VPN backup connections and/or for local Internet access. APN can also leverage existing redundant private WAN connections. Bandwidth optimization can be achieved through proper management of multiple connections to leverage reliability with affordability. Since APN makes packet-by-packet forwarding decisions, rather than per-flow decisions, you can use all available bandwidth, even for a single session. APN performs bandwidth optimization and bandwidth management using multiple connections as a single pipe – sometimes referred to as WAN Virtualization, simplifying the design of QOS rules. APN allows you to add up to seven additional links to your existing WAN. The low cost of broadband Internet links makes it particularly easy to add bandwidth inexpensively at remote sites. For example, adding one 6 Mbps downstream, 768 Kbps upstream DSL to a 1.5 Mbps T1 MPLS connection can increase your corporate WAN bandwidth by 5x at that location. If you add three 6 Mbps links, you've got 12x more bandwidth at the site. Talari's technology delivers more bandwidth at a low cost with greater reliability and performance than the best single Frame Relay or MPLS network.

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Monthly WAN operating costs are one of the biggest expenses in any IT manager's budget – other than employee costs. Talari's technology is a powerful solution that enables you to reduce monthly WAN costs by 40% to 90% while simultaneously adding network bandwidth and improving both network reliability and application performance predictability. There are many ways to reduce IT costs by using Talari's Adaptive Private Networking (APN) technology. Initially, you can eliminate any expensive redundant MPLS or Frame Relay backup connections and/or ISDN connections. Once APN is running in the WAN using a mixture of your existing private WAN bandwidth together with Internet connections, you can reduce the amount of private WAN bandwidth purchased at any given location such as reducing 2 x E1 MPLS connection to a 1 x E1 connection, or reducing the amount of Frame Relay CIR bandwidth or MPLS QoS bandwidth at a location.

Although more IT cost savings can be attained by eliminating expensive private WAN connections altogether and using multiple Internet connections from at least two different service providers, most can experience dramatic cost savings by simply expanding with abundant affordable broadband links. In this way a U.S.-based 1.5 Mbps MPLS connection costing $600 to $1200 per month can be replaced with 2+ WAN links costing somewhere between $100 and $200 a month, for a WAN cost saving at that location of 60% to 85% per month, while at the same time getting 4-10 times the downstream bandwidth. Using diverse Internet connections where available to replace a 2 Mbps E1 - which at some international locations can cost as much as $5,000 per month – can provide IT cost savings of more than 90% a month and pay for the costs of the APN deployment in just a few months.

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