Ever since Alexander Graham Bell invented the telephone in 1876, the world has moved at a frenzied pace. While Graham Bell himself dismissed it as an object of distraction on his work desk, the human civilization, awed by its sheer potential of bringing in that virtual-ism in their lives, has accepted it gladly.
Nearly seventy years after the invention of the telephone, there was one more significant technological breakthrough. The invention of the computer gave us the power of replicating our thoughts and logical reasoning on a machine. While computers and telephony services evolved entirely separately during the early part of the 20th century (with computers being designed fundamentally to work as standalone systems), scientists and innovators soon realized the potential of a distributed computer network. What followed in the ensuing decades of the century was a convergence of computer network and telephony services giving birth to the term, ICT, which is the acronym for Information and Communication Technology.
Here is a depiction, in chronological order, of the most significant events which influenced the emergence of ICT since the invention of the telephone.
With the advent of ICT, we now live in an era when we can talk to our friends and family instantly, no matter how far they are. We access and share all forms of information instantly with somebody, without meeting them. This virtual world was unthinkable in the earlier times in history. And now it has surrounded us in a way that we are getting imbibed by its pervasiveness more and more.
But think for a moment. Is this all magic? How does this virtual communication happen? Obviously, you as the user placing a phone call would only care about hearing the voice at the other end. But again, does it happen all by magic? We know very well that something is being orchestrated behind the scenes, by a set of connections (known as the links) of devices and equipment such as switches, routers, servers (known as the infrastructure). A company (known as telecom operator or service provider) owns and operates this infrastructure. These companies offer the service of making a call (known as services or applications) for us (the subscribers), via a set of access points . This whole arrangement constitutes what is called as a telecommunication network infrastructure.
Icons , courtesy http://icons8.com/
This telecom infrastructure is real, brick and mortar. Companies that raise and maintain it, face the same problems that were being faced by the human civilization before the genesis of ICT. It takes time and effort to raise physical spaces for housing infrastructure and interconnecting them. And as the infrastructure and the services expand, space as well as the cost becomes a constraint. This expansion is a never ending challenge for the telecom service provider. Which is why IaaS(Infrastructure as a Service) is leading another wave of virtualization over the cloud.
But what led to this expansion? One obvious reason is the ever increasing subscriber base. But there are a few specific reasons. Technological evolution and usage patterns are the main factors.
Let’s look as the five chief factors.
There is only one answer for this, “Grow, Expand & Upgrade”. Else, Perish !!
More applications and bandwidth means that the service providers have to continuously grow their service offerings. They also need to expand their telecom infrastructure to increase their coverage area. If the core infrastructure is co-located in a physical space, then the chances are that they will quickly run out of space. Moreover, managing different quality of services & dynamic traffic behavior, catering to both wired and wireless infrastructure, is no longer possible with hardware only devices. They need software-based programmable logic to handle this complexity. For this, they need to upgrade to software defined/ programmable systems which can be deployed on demand, altered dynamically and can run on top of general purpose hardware.
Since physical space always limits their expansion plans, service providers will find it more convenient to adopt network virtualization. They can converge their physical telecom network infrastructure with an on-demand cloud based network function virtualization system. This system can easily run on general purpose hardware running standard off the shelf software and operating systems.
What about the connectivity and orchestration?
With physically co-located devices, the connectivity across the infrastructure can be locally managed over a private network. But with virtualization, all devices need to connect via the internet or some form of VPN. And if these devices keep shifting as a result of the expansion, then the IP addresses and underlying network topologies keep changing, leading to additional hassles of configuration and management.
So for network virtualization to work over the Internet, what we need is a globally unique way of orchestrating the network resources and functions irrespective of whether it is deployed physical or virtually.
This is where the role of an orchestrator becomes very critical. The orchestrator is supposed to manage this mess of frequently changing network topologies and shifting network functions using a standards driven, rule-based, predictable business logic. It also has to ensure that there is no impact on network management and other auxiliary function.
The existence of orchestrator is reminiscent of the 19th century fictitious Ether theory when scientists believed that there exists an invisible substance everywhere called ‘Ether’ through which electromagnetic waves travel in the atmosphere.
This orchestrator acts as that omnipresent “ether.” Through it, the network functions just get deployed across the service provider’s infrastructure, either physically or virtually. Thereby completing the chain of links across the network which leads to delivery of a service from one end of the world to the other end. Indeed, we as subscribers also rely on this “ether” to connect virtually with other users across the world.
Icons , courtesy http://icons8.com/
So why would a service provider need network virtualization?
No service provider in the world is immune to the ever changing scalability requirements in their network. These are largely governed by economic and seasonal behavior coupled with complex technological evolution patterns, beyond any body’s control. Deploying virtual infrastructure over cloud provides them a lot of flexibility in choosing to scale up or down according to the prevailing situation. The need of the hour is a standards-driven framework wherein the connectivity and management across the entire network infrastructure is seamless, whether it is purely virtual or real or a mix of both.
Shyam is the Creator-in-Chief at RadioStudio. He is a technology buff and is passionate about bringing forth emerging technologies to showcase their true potential to the world. Shyam guides the team at RadioStudio, a bunch of technoholiks, to imagine, conceptualize and build ideas around emerging trends in information and communication technologies.
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