RTMP Video drops 80-90% with Cellular

Product Discussion SpeedFusion Connect
1

Hi, I am using the MAX BR@ Pro 5G. I am using it to try to transmit a 4k RTMP video stream from vMix on a laptop through Speedfusion Connect to restream.io.
I have 4 WAN connections:

  1. Cellular 1 - Sim Slot A T-mobile , Sim slot B ATT
  2. Cellular 1 - Sim Slot A T-mobile , Sim slot B ATT
  3. WAN1 - Netgear Nighthawk m6 5G - ATT
  4. WAN2 - Netgear Nighthawk m6 5g - ATT

SpeedFusion connect is configured to use Atlanta servers with a 22ms ping time, as it is only about 18 miles from where I am located.
Outbound policy is set for TCP port 1935 (the port in which RTMP is transported through) to go through a Priority config, with SFC - ATL as first priority, with the 4 WANS following.

I speedtested each individual WAN using speedtest.net. The results were consistently as follows:

  1. Cellular 1 - TMO 66mbps down/24mbps up
    ATT 94mbps down/33mbps up
  2. Cellular 2 - TMO 62mbps down/19mbps up
    ATT 77mbps down/25mbps up
  3. WAN 1 - Netgear Nighthawk m6 ATT 5G - 142mbps down/62mbps up
  4. WAN 2 - Netgear Nighthawk m6 ATT 5G - 151mbps down/51mbps up

When i use WAN 1 and 2, the video stream is able to get up to a bitrate of 30mbps, splitting 15mbps between the two connections.

When i use Cellular 1 and 2, despite carrier, i am only able to get a video stream out with a bitrate of 6000mbps, and it splits the connection up all over the place.

When i use WAN 1, WAN 2, and Cellular 1, My max throughput is 10mbps down, and about 2 mbps up.

Why is Speedfusion slowing down so dramatically just by enabling the internal modems?

The connections are all robust enough to handle a good 10mbps stream with wan smoothing on.

As soon as i disable the cellular modems, the stream goes lightspeed.

I come from the LiveU ecosystem which splits the stream up pretty equally across the connections and it stays a pretty persistent speed, unless a modem disconnects and then it evenly distributes it the best it can… monitoring in the SFC stats, my connections go from uploading 8mbps to uploading 200kbps anda they do this every other one second, on cellular and the WAN connections, and the latency is barely moving in the 40-70ms range.

Anyone have any ideas on what i can try?

2

Here are the test results of using the TCP upload test for SFC in the Status section of the router. This is with Cellular 1 and Cellular 2 enabled, they both have the same settings, rate plan, and both on Tmobile. I ran it with 2 streams to test capability of WAN smoothing. This was after a 60 second test.

The results were the exact same with only cellular 1 enabled. Shouldnt they be better with both Cellular Connections enabled?

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