Hello all. Some context, in my prior residence I was fortunate to have ethernet ran in every room, and had no problems with this setup. However, I have moved and do not have this luxury anymore, and turned to using Moca as each room is wired with coax and was looking for something low latency with high speeds. The goal is to send ethernet from my office where my NAS and internet equipment is stored, to the living room where my media player and game consoles are. For now, my priority was the media player as it plays my 4k blu-ray rips which are located on the NAS, which can go up to 85mb/s bitrate. Spectrum is my cable internet provider, so I ordered up a ScreenBeam ECB62000 MOCA 2.0 adapter with a POE filter (model number glp-1g70cwws) with -70db to put on the spectrum coax drop and on the spectrum docsis 3.1 router. And an Amphenol Moca 2.5 5-1675mhz splitter to go between the modem and moca adapter.

I ran iperf on it, and was pleasently surprised to see roughly 980mbp/s going from the office to the living room! IPERF server was ran on my media player, and the iperf client was my NAS. This simplifies everything, and they are both linux based with a console. However I played back a 4k film, and immediately was getting stuttering. Back to testing, I ran iperf in reverse, and was getting roughly 800-820mbp/s. Which is high, but not enough for my movies which as I stated can go up to 850mbp/s.

I actually ended up locating some Frontier fca252’s on ebay for $45 less than I paid for my screenbeam ones, and I figured at moca 2.5 they may help out with this speed issue I’m having. And to my luck, they didn’t resolve the issue. iperf came back with the same speeds. Of course, I am still limited by my 1gbp/s ethernet ports on my devices, except my router which has a 2.5gb in for the moca. So I started to rip the wall plates off, and look behind each one. Wiring all looks good, except the stinger on the living room coax looked a bit short however I’m not an expert in this matter and if that makes a difference. On the spectrum inlet which splits off into the office and living room, I didn’t realize there was a 5-1000mhz splitter on it, so I placed an amphenol moca 2.5 5-1675mhz splitter on it and was expecting my problems to be solved… and it didn’t. Just my luck. This makes me question how I was even getting MOCA in the first place, as I have them set to LAN mode which is 1125-1675MHZ. But it’s a splitter and not a filter so I guess some can leak through. I tried to bypass the wall plates and my coax wires, and plugged the one moca adapter straight from the living room drop in the wall, and straight from the office drop in the wall. Still no dice.

This is only a 1,000sq feet apartment, so I’m not expecting the coax wire’s being too long causing this drop in speeds. Only test I have yet to run is plugging the two moca adapters in to each other bypassing the wall coax’s. Only so much time in the day… but I plan on this next however I don’t see the moca’s being bad. Please check the photo I supplied of a diagram of my setup.

https://preview.redd.it/fgrtyisr1ezb1.png?width=1920&format=png&auto=webp&s=7f2772b79ba1ac7001677d89040a9c648dc1fb4b

I appreciate any help on this matter, if this is expected moca speeds, or something along the line needs to be investigated.

Edit: in my diagram I stated 7db, I mean -70db.