Arttu Purmonen

Arttu Purmonen

I joined Teleste in 1997 and engineered video processing and data transmission products. I have worked as engineer, project manager, product manager and business director but understanding customer perspective has always motivated me. It brought me to be responsible for system and technical marketing where my internal driving force and former experience can party together. See my LinkedIn.

Arttu Purmonen - Teleste

All blog posts by Arttu Purmonen

Selling broadband to MDUs

I was honoured to participate in a panel at ANGA COM 2023 titled "Accelerating the FTTH Connectivity". This exceptional session was hosted by Anthony Basham, representing The Society for Broadband Professionals, and participants included Daniel Berz, Mark Basham, and Dr. Andreas Iselt. Recognizing that many ANGA COM attendees were simultaneously engaged in other exciting panels and meetings, I've decided to share the insights from my presentation for those who were unable to attend our panel.

Multi-dwelling units can be a treasure trove

We have evidence of growing numbers of multi-dwelling units (MDUs), such as housing associations and campus areas, adopting distributed access architecture (DAA) based broadband. Therefore, we wanted to understand why a growing number of operators are eager to offer DAA-based broadband, especially Remote PHY-based broadband to their MDU customers and why many MDU customers are keen to have it. Speed would be the short answer, but when we looked at what speed really means, it proved to be a much more multi-faceted concept than we initially thought.

Extended upstream in practice: Towards the high-split

At ANGA COM 2022 I had the pleasure to participate in the panel “DOCSIS 4.0 – Precision Equipment enables Extended Spectrum”. The panel was brilliantly hosted by Anthony Basham, and industry experts including Georg Heiler, Nick Padfield, and Jay Lee shared their latest insights. During and after the panel I received several questions related to my topic and decided to answer them in this article. But to answer them properly, I need to put them into the right context, thus my post merges the key elements of my original speech, the questions, and my answers.

Intelligence in networks – thoughts of an industry pioneer at retirement

Looking back on his 40 years long career in the cable industry, Matti Susi, the pioneer of intelligent cable network technology, takes us on a journey through the evolution of networks over the past few decades.


Full Duplex DOCSIS®, European perspective, Part 1

Studies covering possibilities of the FDX DOCSIS technology are available but focus on network architectures and needs of North American cable operators [1, 2]. While networks and needs of European cable operators are in many ways similar to their American peers, some important differences exist. We have used the past six months to research what technical challenges are focal and whether the FDX DOCSIS technology makes commercial sense in Europe. Although our research continues, we can already now stimulate curious minds and discuss pivotal challenges from a European perspective.

The challenges of video delivery when shifting to distributed access architecture:

The shift to distributed access: The challenges of video delivery

The advent of Anga 2018 has kept us busy. Besides practical arrangements, we wanted to create material for operators who are eager to take a quantum leap and shift to distributed access architectures. Our target was to answer the question: How can cable television operators shift to distributed access architectures cost effectively, while still needing to run old legacy systems during (and perhaps even after) the transformation? The question is complex and providing a comprehensive answer would require an entire book. Therefore, we decided to answer the question via several white papers; just published, part 1 covers video transmission when the goal is a Remote PHY-based network.


Use of Net Promoter Score® in the cable television industry – placebo, off-label or remedy

Many cable television executives have embraced NPS, but how many have thoroughly read the original research paper [1] authored by Reichheld? How many know that the research paper says:

Churn: What can be done before revenues are impaired?

Many organisations have optimised their processes in an effort to find new customers. But as markets reach a mature state, customer retention becomes a pivotal strategic challenge for such organisations. Churn is commonly defined as the actions whereby customers discard the services they previously subscribed to. While the reasons for churn are often known and reported, there is very little publicly available information regarding what kinds of events preceded the churn in the cable television industry.


Noise Figure in full digital transmission, useful or dangerous?

Take your favourite CD and switch on your CD player. Connect it directly to your audio amplifier and turn up the volume to its maximum. Everything works if the audio level in the amplifier input is relatively low but not too low. Measure the signal-to-noise ratio (SNR) of the amplifier input and output, their ratio is called Noise Figure (NF).

Who controls remote controls?

Cable operators aggregated content long before broadband connections were part of their portfolio. Since broadband connections started to increase ARPU’s of Cable TV operators, they also gave access to various OTT players. Perhaps the most known has been Netflix, but today many alternatives fight for consumer attention.


What is required from the 4K QAM headend?

DOCSIS® 3.1 introduces new modulation schemes, of which the most advanced is called 4K QAM. Transmitting and receiving advanced constellations while maintaining a decent Bit Error Ratio is not going to be easy. What does it actually require? How should headends be built to make 4K QAM a reality? Will CCAP make the building easier or more complex? And will the centralized DOCSIS architectures offer a similar level of performance than promised by distributed architectures?


Celebrating 20 years of IoT

Our first HFC devices were connected to the Internet in 1996. Three years before IoT was introduced. Today, a majority of our devices are equipped with transponders and what we used to call ‘remote connection’ is now called the Internet of Things (IoT). The Internet of Things is often linked to big data, a concept that everybody has heard about but very few have seen. What does big data actually mean for Cable TV networks?