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Netflix experience on Ka-Band VSAT in Kenya

January 8, 2016 7 comments

Yesterday I, like most people here; woke up to the news that the American multinational provider of on-demand Internet streaming media; Netflix, has expanded into several countries including Kenya. Social media reaction in my view was a tie between those who think these new comers will ‘disrupt’ the market currently dominated by Multichoice’s DStv. The jury on what exactly is the meaning of disruption as applied in that discussion, is however still out.

My views on their foray into Kenya aside, I decided to test the service on my home VSAT link. This was after I read on how it works just in case I had made any assumptions that were wrong. Here, I found out that the minimum recommended bandwidth is 3 Mbps for SD quality video and 5 Mbps for HD quality video.

The particulars of the link are as follows:

  • Ka-band service off the Avanti Hylas-2 satellite at 31 degrees East (somewhere above Uganda)
  • 74 centimeter elliptical dish with a 1 watt Ka-band radio
  • Hughes HN9260 satellite router
  • 15 Mbps download and 2 Mbps upload speed
  • Netgear AC2350 Nighthawk X4 WiFi router

With the VSAT kit I achieved a strong enough signal to enable a DVB-S2 carrier at 8-PSK 8/9 on the down link and do a TDMA/FDMA carrier of 2048 Ksps at QPSK 4/5 on return w.r.t the remote terminal

The 74 centimeter dish with a clear view of the western sky. From Nairobi the look angle is a favourable 88.5 degrees

The 74 centimeter dish mounted on a perimeter wall  with a clear view of the western sky. From Nairobi the look angle is a favourable 88.5 degrees

I registered an account and selected a 58 minute SD quality documentary titled “Rise of the drones” and proceeded to view it. Its took about 3 seconds to open the stream and the streaming started.

The Netflix main screen opened on the Firefox browser

The Netflix main screen opened on the Firefox browser

The picture quality was as expected for  an SD video on my old laptop, I however could not identify how to check this video’s resolution on the stream.

Video quality was consistent throughout the session with no downward review of picture quality

I watched it to the end without a single “Netflix and Chill as it buffers” moment and the stream download rate indicator was about 5 minutes ahead of the play indicator throughout the time.

rate

The progress bar (in lighter shade of grey ahead of the red play duration bar) showing about 5-minute lead

The VSAT links Cacti graph for the 58 minute session showed  that the stream consumed an average of just below 3 Mbps with a peak of 3.7 Mbps. During this time the total downloaded data was 1.3 GB by calculating the area under the graph.

Cacti graph utilization during the 57 minutes of documentary streaming.

Cacti graph utilization during the 58 minutes of documentary streaming.

The above results means that in a multi-viewer scenario where more than one person is using Netflix on the LAN , the VSAT’s 15 Mbps capacity can support 4 concurrent viewers without a problem and will be limited only by the WiFi routers’ capability.

Update: I did Netflix for the entire day on Saturday 9th (via a HDMI stream dongle on TV) with my kids in the usual TV schedule as we do on DSTv (punctuated with sessions of outside play, reading/study, quiet times and no TV during meals). We had consumed 19.4 GB by the time we went to sleep.

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