Connecting USB streamer server to I2s RJ45 input of DAC?

That doesn’t look like it outputs an I2S signal. Since there’s no set I2S standard I’m finding it’s not easy to know if an converter will be compatible with your DAC.  I’ve unfortunately been down that road and have decided to eventually go with something like this that’s more likely to work and also sound better.  If anyone knows of a cheaper quality option to convert USB to I2S I’m all ears. 

https://www.amazon.com/Singxer-Digital-Interface-XU208-Femtosecond/dp/B07KYJT3PB/ref=asc_df_B07KYJT3PB/?tag=hyprod-20&linkCode=df0&hvadid=385577198395&hvpos=&hvnetw=g&hvrand=3385475979123122392&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9003636&hvtargid=pla-587757522695&psc=1&tag=&ref=&adgrpid=79288771115&hvpone=&hvptwo=&hvadid=385577198395&hvpos=&hvnetw=g&hvrand=3385475979123122392&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9003636&hvtargid=pla-587757522695

Nice DAC.  Yeah, if you want to be sure any I2S source will work with your DAC it’s best to forward the pin configuration to your DAC manufacturer and they’ll be able to tell you if it’ll work.  It’s bit of a PITA not having a standard, but it seems worth the effort given the potential benefits of I2S.  Plus, it’s kind of a shame to have that option available on a DAC and not take advantage of it.