Preparing to buy a set of MOCA 2.5 adapters...

OzarkEdge

Part of the Furniture
I'm about to order a set of ScreenBeam MoCA 2.5 adapters ECB7250:

Amazon.com: ScreenBeam Bonded MoCA 2.5 Network Adapter for Highest Speed Internet, Ethernet Over Coax - Starter Kit (Model: ECB7250K02)

ScreenBeam appears to be a retail outlet for Actiontec(?), so I'm assuming these adapters are nearly the same/good as Actiontex ECB7250s sold to ISPs, etc. (not available in the retail channel). 'Good as' including Actiontec-sourced firmware and documentation. These adapters (Actiontec) appear to use the latest MaxLinear MxL93712 chipset.

Application will be over coax dedicated to MoCA and two OTA TV antennas (coupled and preamped; no cable modem/DOCSIS signaling). I plan to add two POE/LPF/MoCA filters, one at each end to stop the MoCA signal from reaching the preamp/coupler/antennas and the TV/AVR tuners.

A few concerns:

o Any feedback on the ScreenBeam adapter choice?

o Any suggestions for sourcing the MoCA filters? The goCoax filters look good: OT-LPF-1002 | goCoax

o Can I inject the antenna preamp power at the media center end of the MoCA run (like I'm doing now), or should I place it beyond the MoCA filter at the antenna end, just below the preamp?

o I assume I can use a non-MoCA splitter beyond the MoCA filter at the media center end(?)

Thanks for any advice!

OE
 
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degrub

Part of the Furniture
DC power injector for the TV pre-amp will see some additional line loss going through two splitters, assuming they will pass DC ( i assume so) . My injector is directly off the coax from the pre-amp to minimize voltage drop before the TV signal passes to the MOCA modem AUX/TV coax connection.

which legs of the splitter are connected to what on each end ?
Looks like an additional 7-8 dB of insertion loss for the TV signal with two splitters in line.
 

OzarkEdge

Part of the Furniture
DC power injector for the TV pre-amp will see some additional line loss going through two splitters, assuming they will pass DC ( i assume so) . My injector is directly off the coax from the pre-amp to minimize voltage drop before the TV signal passes to the MOCA modem AUX/TV coax connection.

I may move the preamp power to the preamp end since I am adding some splitter attenuation.

which legs of the splitter are connected to what on each end ?
Looks like an additional 7-8 dB of insertion loss for the TV signal with two splitters in line.

Yep.

Here's a textual diagram, flows down...

Deck (demarc)
cable ISP <coax> ground block coupler <coax to study...

Study
...> wall plate coupler <coax> UPS suppression <coax> cable modem <1GbE> AX86U router <2.5GbE to media center...

Media Center
(existing 1GbE cable and switch not shown... I may try this link first)
...> MoCA adapter <MoCA coax> MoCA 2-way splitter <MoCA coax...
...> MoCA filter 70dB <coax> 3-way splitter <coax> TV, TV tuners, AVR (FM)
...> wall plate coupler <MoCA coax to deck...

Deck (demarc)
...> ground block coupler <MoCA coax to garage...

Garage
...> MoCA 2-way splitter <MoCA coax...
...> MoCA filter 70dB <coax> preamp DC power injector <coax> preamp <coax> 2-way antenna coupler <coax> TV antenna1,2
...> MoCA adapter <1GbE> AC86U node

The MoCA filters attach directly to the MoCA splitters, eliminating the intervening MoCA coax shown. The MoCA splitters are oriented with their input from the TV antennas.

I think the TV signals will survive the added MoCA splitters and filters over what I currently have, which is everything except the new MoCA bits.

OE
 
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degrub

Part of the Furniture
you might have to be careful in the TV signal path with the orientation of the splitter, if i am remembering my rf correctly, as the spec indicated substantual return loss in the 5-1000 MHz range. But i may be misremembering these days.

Check the specs on the DC injector. It may already have significant filtering on the reverse path to the antenna.
 

OzarkEdge

Part of the Furniture
you might have to be careful in the TV signal path with the orientation of the splitter, if i am remembering my rf correctly, as the spec indicated substantual return loss in the 5-1000 MHz range. But i may be misremembering these days.

Check the specs on the DC injector. It may already have significant filtering on the reverse path to the antenna.

Will do. I was wondering about splitter INs and OUTs... I guess I'll orient them for the TV signal 'flowing' to the tuners.

OE
 

krkaufman

Very Senior Member
ScreenBeam appears to be a retail outlet for Actiontec(?), so I'm assuming these adapters are nearly the same/good as Actiontex ECB7250s sold to ISPs, etc. (not available in the retail channel). 'Good as' including Actiontec-sourced firmware and documentation. These adapters (Actiontec) appear to use the latest MaxLinear MxL93712 chipset.
Used to be. I think it’s more that ScreenBeam was spun-off from Actuontec; last I checked, Actiontec’s ECB7250A appeared to be a rebranding of a goCoax adapter.
 

OzarkEdge

Part of the Furniture
I prefer 70 dB MoCA filters for OTA scenarios, to fully snuff the MoCA signal. (edit: annoyingly, Amazon’s raised the price on these recently)

Thanks for the tip! I will consider those filters... they do have a scrunch more insertion loss.

OE
 
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OzarkEdge

Part of the Furniture
Actiontec’s ECB7250A appeared to be a rebranding of a goCoax adapter.

I'm not feeling that. :)

I like goCoax at face value but they just don't have enough presence for my money. I don't like white boxes... big mistake, imo, for trying to establish a beachhead market unless that market is Apple users... which doesn't equate since MoCA networking has many potential pitfalls compared to Ethernet... it's like WiFi with cables!

OE
 

degrub

Part of the Furniture
ya should have worked with the original ethernet cable ! We became professional vampires. No Buffy, fortunately ;-)
 

OzarkEdge

Part of the Furniture
ya should have worked with the original ethernet cable ! We became professional vampires. No Buffy, fortunately ;-)

I worked with arcnet and Netware!

OE
 

OzarkEdge

Part of the Furniture
Here's a textual diagram, flows down...

Deck (demarc)
cable ISP <coax> ground block coupler <coax to study...

Study
...> wall plate coupler <coax> UPS suppression <coax> cable modem <1GbE> AX86U router <2.5GbE to media center...

Media Center
(existing 1GbE cable and switch not shown... I may try this link first)
...> MoCA adapter <MoCA coax> MoCA 2-way splitter <MoCA coax...
...> MoCA filter 70dB <coax> 3-way splitter <coax> TV, TV tuners, AVR (FM)
...> wall plate coupler <MoCA coax to deck...

Deck (demarc)
...> ground block coupler <MoCA coax to garage...

Garage
...> MoCA 2-way splitter <MoCA coax...
...> MoCA filter 70dB <coax> preamp DC power injector <coax> preamp <coax> 2-way antenna coupler <coax> TV antenna1,2
...> MoCA adapter <1GbE> AC86U node

The MoCA filters attach directly to the MoCA splitters, eliminating the intervening MoCA coax shown. The MoCA splitters are oriented with their input from the TV antennas.

OE

My AiMesh now has a wired MoCA 2.5Gbps backhaul, limited to 1GbE at the AC86U node WAN port, and shared with OTA TV antennas.

I purchased (Amazon.com) the ScreenBeam MoCA 2.5 starter kit ECB7250K02. It includes two PicoLINK MoCA 2-way splitters 5-1675MHz. All seem to be well-made and documented. The wall-mount holes must be hidden under 2 of the 4 rubber feet(?).
1665360012426.png


And I purchased (Amazon.com) two PPC/Belden MoCA 70dB Filters GLP-1G70CWWS (Silicon Weather Seal... the one on the right). Again, well-made and documented. These are placed to block MoCA at the TV endpoints.
1665360810747.png


The TV preamp DC power injector had to be placed beyond the MoCA filter at the antenna end... being closer to the preamp seems to have subjectively improved the TV signal/picture a bit (it did not work across a MoCA filter).

I have not yet inspected the MoCA adapter firmware webUI... they were plug and play. I'll save that for a cold winter day.

Robust, dedicated, full-duplex, wired backhaul enabled... marginal, non-dedicated, time-shared, half-duplex, wireless backhaul disabled to release all WiFi for client use only... this was a good AiMesh upgrade!

OE
 
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krkaufman

Very Senior Member
And I purchased (Amazon.com) two PPC/Belden MoCA 70dB Filters GLP-1G70CWWS (Silicon Weather Seal... the one on the right). Again, well-made and documented. These are placed to block MoCA at the TV endpoints.
Well done Re: the upgrade.

Since the person for whom I’d just composed the diagrams went Buehler on me, maybe they’ll be of interest to you…
Normally, the ant/sat diplexer workaound would be sufficient to block MoCA signals from hitting the TVs, but moot in your case since you’ve already employed MoCA filters for the task — and with superior attenuation to what the diplexer would offer. So the diplexer workaround may only be useful were you a few dB shy on signal strength at a split TV.
 

OzarkEdge

Part of the Furniture
Well done Re: the upgrade.

Since the person for whom I’d just composed the diagrams went Buehler on me, maybe they’ll be of interest to you…
Normally, the ant/sat diplexer workaound would be sufficient to block MoCA signals from hitting the TVs, but moot in your case since you’ve already employed MoCA filters for the task — and with superior attenuation to what the diplexer would offer. So the diplexer workaround may only be useful were you a few dB shy on signal strength at a split TV.

Interesting. My configuration seems standard now that I've determined it, and thanks to your 70dB filter recommendation. I did have to move the preamp power injector into the garage attic (for now anyway), so no longer on the media center UPS in the house and much hotter up there (preamp has survived up there for years). We'll see how it fairs... I've got a spare, and I may think of a way to drop it down into the garage space.

I did discover a FAM 8dB attenuator on my separate cable ISP coax at the demarc (Internet service only). I don't recall that being there when I moved in and cleaned up the demarc, but maybe it was... I'm paying more attention to coax details these days. With the typical homeowner adding coax elements/losses willy-nilly, I can't imagine 8dB attenuation being significant... but I'll leave it alone.

OE
 
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degrub

Part of the Furniture
too much RF power can drive a receiver unstable worst case, and just create noise otherwise that interferes with S/N.
 

krkaufman

Very Senior Member
with the same soecs
Based on what specs? The listing’s “full description” lists specs for an older filter, and one with less stop-band attenuation.

“Bandstop provides a typical 35-45dB of rejection in the MoCA 1125-1525Mhz band.”

Even assuming current models, the “SNLP” model has lower attenuation, per specs.
 
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