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The Importance of Testing and Service Level Management in Private Networks


Private networks are taking on greater importance in vertical-specific use cases such as manufacturing, mining, and transport logistics. These involve diverse ecosystems, technologies, and environments. Because they drive business outcomes, adopting enterprises indicate they’ll pay a premium for more stringent SLAs. Ensuring that quality experience requires an advanced testing strategy.

As 5G deployments roll out globally, and edge computing services become more available, private networking is emerging from trials into the field. Because most private networking use cases are vertical-specific (i.e., smart factories, smart mining, and intelligent transport asset management), there are diverse ecosystems (service providers, network providers, system integrators and cloud providers), technologies (wireless, satellite, microwave, and edge computing), and environments (on-premises, hybrid, network slicing, and more).

Private networking enables operational outcomes, which drive a common set of business outcomes that cut across the range of verticals mentioned above – whether it’s driving sales, and net profit margin, to cost reduction and optimizing operational efficiencies. Private network maturation shifts the focus from technology to operations.

A market survey of enterprises performed by STL Partners for Spirent reveals that security and network resiliency are key drivers motivating enterprises to consider private networking. The survey highlights how service level management (SLM) is especially critical because private networking directly enables enterprise business outcomes, which are impacted by network performance and service-level agreement (SLA) compliance.

The survey also revealed that service providers expect enterprises will pay a premium for the more stringent private networking service levels required to support emerging use cases. Because vertical applications and diverse use cases drive the need for private networking, all private networks require highly agile and automated testing, assurance, and service level management solutions. As a result, service level management for all verticals will play a major role in the growth of private networks, by validating that each vendor, service provider, and integrator delivers the service levels/capabilities that the end-user expects.

Enterprises will pay a premium for more stringent SLAs because private networks drive business outcomes.

The need for private networking SLM

Private networks differ significantly from traditional networks. They integrate a broad range of technologies and domains (i.e., wireless, wireline, security, edge, and cloud), and must support multi-cloud access, which typically includes edge computing and are more closely coupled to the applications environment. End-users have a wide range of deployment scenarios, applications, and business outcomes they seek. Consequently, the private network ecosystem is far broader than traditional networks.

End-users demand that private networks achieve their diverse business outcomes, hence a comprehensive service level management strategy is an essential requirement for success.

Private networking SLM challenges

Traditionally, service level management is constrained to a particular domain, i.e., radio access network (RAN), transport, or optical core. Enterprises deploying private networks, however, demand the ability to monitor multiple domains using a single pane of glass. Such domains transcend communications with interwoven elements in cybersecurity, edge computing, cloud, and mission-critical applications. Moreover, the interdependence with mission-critical applications necessitates richer SLM than a typical WAN, and an end-to-end perspective for an individual service provider. Ensuring this interlaced complexity works reliably and as planned requires a mature testing strategy with a vendor-neutral approach.


Ensuring this interlaced complexity works reliably and as planned requires a mature testing strategy with a vendor-neutral approach.

How testing supports business outcomes and SLM in private networks

Private network KPIs (key performance indicators) impact application and business outcomes. Examples include:

  • Real-time, autonomously controlled machines and processes typically impose significant latency demands where an inability to maintain low latencies impedes business processes.

  • Increased production volume and cycle time typically require greater network throughput and scale.

  • Network downtime can impose detrimental consequences, impairing end user’s ability to deliver to their customers (and hence affecting revenue), disrupting JIT (just-in-time) manufacturing processes (including impacting the supply chain), driving up Opex (e.g., equipment is idle, facilities and staff are non-productive, and more).

These factors, along with multi-everything (i.e., -vendor, -domain, -technology) necessitate the need for a highly automated, intelligent, and proactive service level management strategy. To achieve that, organizations must ensure each element is performing and behaving as expected and promised by the supplier. Any changes attributed to network upgrades, operational changes, failures, or security compromises don’t just degrade performance, but very likely disrupt business continuity as well because of the coupling between network performance, availability, and the ultimate use cases.

It's not just about network performance and availability. Organizations need to validate the user experience at the only place it can accurately be measured – the end-user device. As a result, ensuring private network performance levels becomes mission-critical for the key applications that are essential for operational success.

Proactively identifying performance bottlenecks, failures, and security compromises are table stakes for private network success. Comprehensive testing should provide rapid root cause analysis to pinpoint the source of the problem across multiple domains (and underlying technologies). Because of the close coupling between private network performance and the operational objectives, validation is essential in the design phase, during deployment, and once the network becomes operational.

Test and assurance best practices for private networking service level management.

The figure above presents service quality management testing best practices based on Spirent’s discussions with analysts, our supply-side customers, and involvement in leading-edge private networking projects. The ability to rapidly isolate problems in the multi-vendor, multi-technology, multi-domain network is essential, as is the capability of assessing the end-to-end user experience. A particularly essential best practice includes security efficacy validation, which ensures that security functions are behaving and performing as expected with a high degree of automation and availability to the rich telemetry and analytics which are all critical to assure comprehensive SLM. For decades, enhancing enterprise security has been top-of-mind for corporate executives; multi-domain SLM exposes the relationship between network behavior and the effectiveness of security controls deployed.

Closing thoughts

While private networks offer previously unobtainable capabilities, and significantly lower TCO, unprecedented complexity necessitates a new approach to service level management. To address this challenge, multi-domain root cause analysis (RCA), automation, AI/ML, and advanced analytics across a broad range of domains are essential to address the complexity.

Comprehensive and robust private network service level management is an essential tool to ensure business outcomes as planned. With this in place, a significant opportunity exists for MNOs and CSPs to monetize their investments in 5G. None of this is possible, however, without a mature testing strategy in place, and employed at the earliest point possible in planning and development, and throughout the lifecycle of the solution.

To learn more, watch the webinar Developing Achievable SLAs for 5G Private Networks and read the report Accelerating Private Networking Value Creation.

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Marc Cohn
Marc Cohn

Director, Marketing & Technical Strategy, Virtualization

Marc works for Spirent's strategy organization helping to define technical direction in the Virtualization segment. He has been a major contributor to the SDN and NFV community, as the former VP of Network Strategy for The Linux Foundation, the Executive Director for the OPEN-Oopen orchestration project (since merged into the ONAP project), Market Area Director and ONF Fellow for the Open Networking Foundation (ONF), an advisor to the Chair of the ETSI NFV ISG, and Silver Member representative (and Treasurer) for the OpenDaylight Board of Directors. He has also held a number of executive roles in strategy and marketing at ClearPath Networks, Ciena Corporation and IP Infusion, among others. Most recently, Marc was appointed as co-chair of the MEF Certification Committee and joined the MEF Leadership Team. Join the conversation and connect with Marc on LinkedIn or follow on her on Twitter at @mdcohn