Excentis staff members regularly write on technical and less technical topics in our different business areas. We hope you will find some useful gems of information here. If you have any suggestions we love to hear from you on blog@excentis.com.

Happy reading!

Privacy is an integral and important part of DOCSIS because of the shared medium over which it operates (the HFC network). Since version 1.1, the authentication of cable modems is done using a chain of X.509 certificates (PKI infrastructure). This blog post explains the history of the different PKI infrastructures and how it will look like in DOCSIS 3.1.
To check our Wi-Fi signal reception, we tend to look at the signal notification icon of our devices: the more bars, the better the signal. But more often than not, the amount of bars doesn’t give us a good indication of the quality of our connection. We've all had situations where 4 or more bars are lighting up, but websites are still loading agonizingly slow. To make things worse, a lot of professional Wi-Fi planning and comparison tools use this same signal strength metric as a substitute for Wi-Fi throughput! This blog post will show that the Received Signal Strength Indication or RSSI of a link (which is basically a numeric value for the number of bars) doesn't correlate well with the throughput that can be achieved on that link. In other words, big investment decisions in Wi-Fi infrastructure turn out to be based on paltry data at best.
This blog post helps you solve common issues you may encounter when testing Network Address Translation (NAT) routers, or devices behind NAT routers.
From time to time operators or manufacturers ask us to verify how well a CM can cope with LTE interference. Will a cable modem / cable gateway suffer from a nearby wireless (LTE800) signal? How well can it withstand such a wireless signal? This post will dive into the wonderful world of (LTE) interference testing on cable modems. Will it survive 3 V/m, 5 V/m or 10 V/m?
Extended upstream power allows 3.0 cable modems to transmit upstream bursts at higher powers than previously established. This feature has been added some time after the introduction of EuroDOCSIS 3.0. But why? Do we need higher powers now than before?
TCP is an old protocol. Its original RFC dates back from 1981. Over time it has been tweaked and tuned in order to keep up with ever increasing demands. In this post I describe how one small tweak can make a big change in performance when using TCP on a 10Gbit Ethernet link.