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!

Although Wi-Fi operates at different frequencies than the ones used by the DOCSIS system, many interference cases have been observed. The interference can have an impact on the DOCSIS system, on the Wi-Fi system or on both.
New features and bug fixes require new software to be downloaded and installed onto a cable modem. DOCSIS defines a secure way to do this: the Secure Software Download (SSD) mechanism. This blogpost describes that mechanism and how it changes in DOCSIS 3.1.
The first steps in a new technology are always challenging. To control the take off for the upcoming DOCSIS 3.1 (promising a great deal of capacity potential), it helps to supplement the theory with a more practical view on things. You don’t want to launch a pilot or field trial without some prior practical experience, right? In this blog post we'll take a signal/spectrum analyzer and find out what the DOCSIS 3.1 OFDM downstream signal really looks like.
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.