By: John Shepler
Software Defined Networking (SDN) and SD-WAN, specifically, can’t magically produce more bandwidth. Upgrading to a dedicated, high-bandwidth service with a service level agreement from a reputable carrier is a more straightforward solution. However, SD-WAN can offer faster and more reliable bandwidth at a lower cost.
The Root of Bandwidth Issues
Businesses grappling with bandwidth issues often face budget constraints that limit them to low-cost options or struggle with the unavailability of suitable services in their location.
Budget-friendly options often consist of consumer-grade broadband services repackaged for businesses. These include DSL, cable broadband, cellular wireless, and sometimes even two-way satellite.
These services share a common characteristic: bandwidth is shared among all active users. This leads to inconsistent speeds throughout the day. Moreover, they typically offer only internet connectivity, requiring VPNs or accepting security risks for point-to-point connections. Lastly, these services often come with “best-effort” terms, lacking uptime or performance guarantees.
Are All Unregulated Services Subpar?
Not necessarily. Cable internet speed and performance have dramatically improved, especially with the advent of DOCSIS 3.0 and 3.1. Many populated areas now have access to fiber-like speeds at competitive prices. Reliability varies depending on the service provider, with some offering near-perfect uptime, while others are less consistent.
Cellular wireless and satellite technologies have also advanced considerably. Both previously suffered from limited bandwidth, congestion, and inconsistent coverage, but not anymore. With 4G and the emergence of 5G, fiber-like speeds and dependable service are increasingly common. Similarly, satellite internet now provides 100 Mbps nationwide, with gigabit speeds on the horizon. Spot beams ensure reliable connectivity even in remote areas.
Despite these advancements, both cellular and satellite internet have limitations. Satellite internet has inherent latency issues that won’t be fully resolved until Low Earth Orbit (LEO) constellations become operational. Both technologies are constrained by available spectrum, leading to data caps to prevent overuse and potential bandwidth throttling.
How SD-WAN Addresses These Challenges
SD-WAN cannot defy physics, compensate for unreliable providers, or create service availability. However, it excels at managing multiple, potentially limited-bandwidth connections to establish a single, high-performance network.
This is possible because individual connections experience varying latency, packet loss, speed, and reliability. Beyond inherent technological differences, performance fluctuates constantly. SD-WAN’s strength lies in its ability to dynamically route traffic based on real-time conditions, a task too complex and rapid for manual management.
The Other SD-WAN Advantage
SD-WAN’s effectiveness also stems from its ability to prioritize traffic based on sensitivity to network conditions. VoIP calls, for instance, are highly susceptible to latency and packet loss, unlike data backups. Cloud-based business applications often demand consistent high performance, while others are more tolerant. Recognizing this, the SD-WAN controller analyzes traffic demands, available paths, and their real-time performance to optimize routing and resource utilization.
An SD-WAN setup can incorporate a variety of connections, including DSL, cable, T1 lines, satellite, 4G or 5G wireless, point-to-point microwave, Ethernet over Copper, Ethernet over Fiber, and even SONET fiber optic lines. The optimal combination depends on performance requirements, available connections, and budget.
If your business is hampered by an inadequate bandwidth solution, be aware that more options exist today than ever before, thanks in part to SD-WAN. Discuss your specific business requirements with a network bandwidth consultant to explore potential improvements.
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