Back in the early 1980s, telecommunication was a state monopoly in pretty much all countries all over the world. Privatization in the 1990's and the resulting competition gave an incredible boost to the industry. Today we enjoy incredibly fast networks in many places, both fixed and wireless, and there is no sign that the increase … Continue reading Digging Is The Expensive Part – Not The Fiber
Fiber connectivity is moving closer and closer to people's homes. Some, like me in Paris, are fortunate enough to get a fiber line right into the apartment and enjoy speeds of well beyond 250 Mbit/s in downlink and 50 Mbit/s in uplink. That's something the good old telephone line can't do today by a wide … Continue reading G.Fast – A Technology To Prevent A Fiber Monopoly?
While I’ve had a 1 Gbit/s Fiber connection at home in Paris since 2014 with speeds well beyond 250 Mbit/s downlink and 50 Mbit/s uplink, most people in Germany can still only dream of fiber connectivity. So while I consider myself fortunate with fiber in Paris and at least 50 Mbit/s down – 10 Mbit/s … Continue reading 1 GBit/s At Home Was Yesterday! 10 Gbit/s Is The New Black!
After the more high level parts 1 and 2 on Starlink, it’s now time to have a closer look at how the Starlink downlink channel behaves. I’m totally amazed by the system and it performs very well in Germany. That being said, it probably comes as no surprise that on the IP layer, the graphs … Continue reading Starlink – Part 3 – Downlink Performance – The BBR Version
Another crazy year, both good and bad in so many ways, is coming to an end, so here I go with time honored tradition of looking back to what moved me this year in tech! In The Wireless Domain Obviously, there’s been a lot going on in the wireless domain again. While some parts of … Continue reading Things That Moved Me in 2022
Wi-Fi Tethering on Android is a great thing and has totally changed the way we use the mobile Internet today. One thing Android does not do well today at all, however, are bulk uploads over Wi-Fi tethering, especially under bad LTE radio conditions with low throughput. The screenshot above shows how a big file upload … Continue reading TCP Tracing – Part 8 – BBR and Uplink Congestion Avoidance
After the interesting throughput experiences I have made over the last mile, it was time to push the limit a bit and get an idea of how a high speed data transmission between virtual machines looks like that are in different data centers. While most of the public cloud infrastructure I used is located in … Continue reading TCP Tracing – Part 7 – Between Data Centers
After the interesting experience of chasing packet loss issues of my fiber router in Paris and learning about different TCP congestion control algorithms in the process, I wondered how TCP handles changing network conditions in wireless networks. After all, especially when on the move, air interface conditions and general load of the cell changes all … Continue reading TCP Tracing – Part 1 – How TCP Reacts to Changing Network Conditions
I’m quite amazed I am already into part 8 in this series of exploring the limits of using a headless workstation as a ‘power booster’ next to my notebook. The next thing I have taken a closer look at is the connection between the notebook and the workstation, a 1 Gbit/s Ethernet link. That’s good … Continue reading 2.5GbE Network Performance – Workstation Power at Home – Part 8
While I was investigating potential congestion issues in the roaming backhaul link of mobile networks I noticed again once more that this is by far not the only place where network operators are not providing enough capacity during busy hours in the evening. Another unfortunate example are fixed line access networks. Here are two examples … Continue reading Congested Peering and Transit