Hello everyone. I was able to set up the box with Wingo XGS. The download speed is good at around 8GB. However, the upload is very poor at 1.5GB. Does anyone know the problem?
With the Wingo router, down and up work perfectly with around 7-8GB.

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Accepted Answer

I can confirm this. UDM Pro Max both times as firewall & router. 
With the Wingo Box I had 5GBit/s down, 7 GBit/s up. 
With the Zyxel I have 6GBit/s down, 1 .2GBit/s up.
Both times Speed Test Provider: AltusHost B.V. to Switzerland

Answer

I've had a similar problem for some time with this bridge. With Wingo too. Download at ~920Mb/s but upload at 200-300Mb/s. With iperf3, I get over 900Mb/s upload on a UDP test. I notice quite a few TCP retransmissions on an upload test.

Answer

Yes, I only had half the upload with Sunrise. I was able to connect my UDMpro directly to my new provider. Since then 0 problems

Answer

Hi, congratulations on being able to configure this.
Can you give the procedure used in detail?
Are you using the original router sfp module in the Zyxel bridge port?
Are you using the original swisscom / Wingo fibre optic cable?
Maybe that's where the upload problem is coming from.

Answer

same problem only the other way round with teleboy (/iway!SWISSCOM). Ordered 1 GBIT, upload ok, download 400 Mbit with Zyxel bridge.  With provider router up and down ok... 
no solution so far

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Question about Zyxel XGS-PON Bridge PM7300

Hello everyone. I was able to set up the box with Wingo XGS. The download speed is good at around 8GB. However, the upload is very poor at 1.5GB. Does anyone know the problem? With the Wingo router, down and up work perfectly with around 7-8GB.