BT Fibre 900 variable speeds

ElliotNewman — Wed, 13 Jan 2021 10:20:00 GMT

Hi all,

I thought I would start here before trying to get through the layers of BT phone support.

I am able to obtain ~950MBps on fast.com - using a modern Macbook Pro wired into my Router. Generally speaking, my broadband speed is very good, or so it seems. I am told speed tests likely use multiple streams hence the good speed.

However as a video content creator, I need to be able to download a very high quality video stream which I do via specialist video equipment and encoder and decoder boxes. I opened ports on my Router to receive this video stream which is configured at a data rate of between 150-200Mbps (depending on how I configure it).

I have noticed recently that I am seeing frame drops, so ran some benchmarking with iPerf to see what might be happening, the result seem to point to the issue being my bandwidth:

iperf3 -c 62.210.18.40 -u -b200m -R
Connecting to host 62.210.18.40, port 5201
Reverse mode, remote host 62.210.18.40 is sending
[ 5] local 192.168.1.126 port 53264 connected to 62.210.18.40 port 5201
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-1.00 sec 20.3 MBytes 170 Mbits/sec 0.019 ms 1206/15982 (7.5%)
[ 5] 1.00-2.00 sec 21.5 MBytes 180 Mbits/sec 0.040 ms 1697/17319 (9.8%)
[ 5] 2.00-3.00 sec 22.0 MBytes 184 Mbits/sec 0.023 ms 1385/17369 (8%)
[ 5] 3.00-4.00 sec 21.6 MBytes 181 Mbits/sec 0.022 ms 1653/17354 (9.5%)
[ 5] 4.00-5.00 sec 21.8 MBytes 182 Mbits/sec 0.014 ms 1550/17390 (8.9%)
[ 5] 5.00-6.00 sec 21.3 MBytes 179 Mbits/sec 0.023 ms 1819/17328 (10%)
[ 5] 6.00-7.00 sec 20.8 MBytes 175 Mbits/sec 0.024 ms 2199/17373 (13%)
[ 5] 7.00-8.00 sec 20.4 MBytes 171 Mbits/sec 0.042 ms 2412/17281 (14%)
[ 5] 8.00-9.00 sec 20.1 MBytes 168 Mbits/sec 0.279 ms 2738/17357 (16%)
[ 5] 9.00-10.00 sec 19.5 MBytes 163 Mbits/sec 0.016 ms 3241/17428 (19%)
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-10.00 sec 239 MBytes 200 Mbits/sec 0.000 ms 0/172181 (0%) sender
[ 5] 0.00-10.00 sec 209 MBytes 175 Mbits/sec 0.016 ms 19900/172181 (12%) receiver

I am advised that in order to reduce frame drops in my video stream, I would need to see closer to 0% or 0.xx% in these tests.

Does anybody know where I should even start to diagnose this? Is this something that can even be solved?

Many thanks,

Elliot.

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BT Fibre 900 variable speeds