Sending OTA through MoCA

It's a great example of how I would not do it.

But you can try it. Something might work.

Wow, so you can run RF and Ethernet traffic simultaneously on a MoCA cable? Groovy. Hope u are aware of the bandwidth limitations.

From what I see in the diagram, it looks good. All you can do is try it and see how it works.

Please, reference the other thread where I explained your situation.

As I said you need to bring the main cable to a common point with the other coax home runs inside the house. This is the back bone of the network.

You must then bring a coax drop from this point to the first MoCA adapter input. From there, it's MoCA adapter coax out to cable modem, cable modem Ethernet out to Router in, Router Ethernet out to MoCA adapter. That establishes your network.

I see absolutely no need for the switch in your diagram. The PC, printer, and NAS can all connect to the router. You have a Gigabit switch and your router is not.

The whole point of MoCA is to create an Ethernet network over existing TV coax cable. You've ignored that concept in the first part of your diagram showing the PC. The MoCA adapter takes the Ethernet signal, modulates it to sit on top of the lower cable TV frequencies (Broadband), and allow a second or third etc. MoCA adapter to demodulate that frequency back to the original Ethernet standard.

As I said, you can hook it up as you have shown and something might work.

Is there a reason not to simply do it this way? With only a two-way splitter you may find that the amp is not required...

Yes, good. I posted this for someone else yesterday and was about to post it for you too. Good man, you're on the right track now!





OK, let's walk through this.

The top third of your second diagram is now correct.

The cable comes in to the MoCA adapter first and then has a coax out to feed the modem. The coax cable signal carries the internet connection and normally cable TV. The signal passes through the MoCA adapter to the modem where the internet signal is demodulated and comes out the Ethernet connection; nothing happens to the cable TV signal, dead end.

The Ethernet connection from the modem feeds the Ethernet signal of the router input. The router is now live and you have the beginnings of a network because routers route the signal to other devices etc. Your PC and what ever else can plug into the router too, and you have them networked via the router; you know this.

Remember your original goal was to extend your wired network through the house without running CAT5e and tearing up the walls, drilling holes, etc.

So, now we are going to take an Ethernet cable out of the router and bring it back to the MoCA adapter and plug it in the the MoCA adapter Ethernet connection.

The MoCA adapter will now take the Ethernet signal from the router and modulate it above 1Ghz and send it back down the same coax cable that is the coax in, input. This input is really an input/output that energizes or turns the home run coax through out the house into an Ethernet network over coax.

You have correctly joined the MoCA adapter coax (your second diagram, top third of the diagram) to the rest of the house coax by adding the splitter. That splitter should have a POE filter combined with it or in front of it to prevent the MoCA signal from traveling back outside. Very important to do this.

OK, so far so good?

Now, you show the coax going through the wall to a three-way splitter. The coax must go to the input side of the splitter. You show it going to the output. You could make this a two-way splitter but three is OK too. We'll come back to this. Remember, all of the splitters must work above 1GHz to be able to pass the MoCA frequencies (use 2GHz splitters).

Ok, the coax coming out of this splitter should go to the input of the next MoCA adapter (You show it connected to the video out). This MoCA adapter is now seeing the modulated Ethernet signal from your router carried by the coax from the first MoCA adapter. The MoCA adapter will now demodulate the Ethernet signal and you can take it off of the MoCA adapter Ethernet connection and feed your X-Box. The Video out of the MoCA can be used for a TV, etc.

The X-Box will talk back to the network via Ethernet connected to the MoCA adapter where the X-Box Ethernet signal is modulated at the MoCA adapter, sent back over the same input coax to the first MoCA adapter, demodulated and sent over the Ethernet to the router, etc., etc.

OK?

Back to the splitter, we still have one drop to feed your basement.

Bring the coax from the splitter to the third MoCA adapter in your basement. Feed the coax to the MoCA adapter coax input. Bring the video out coax and the Ethernet cable from the MoCA adapter to your HTPC.

Now you have an Ethernet over coax wired network.

Oops! We forgot your OTA antenna. (not really) Bring your OTA coax and screw it into the three-way splitter. The OTA signal will be distributed over the coax attached to the coax network including the video outs of the MoCA adapters. Provided you don't run into any frequency/amplifier interference it should work. But I can't guarantee it.

You can hang an Ethernet switch off the MoCA adapter at a location if you need to.

Additional MoCA adapters can be connected to other coax drops as long as the drops are connect to a common point.

Capice? Cheers!

Nope. To me you are running MoCA because you don't have existing CAT cables to shuttle your LAN traffic through and don't want to lay new cables. If this one coax cable takes care of everything with no downside, I say it's too good to be true, that's all am saying.

Anywhoo, the guys here will give u enough pointers.

Yes, there is a reason, it's not right.

It should be bi-directional. I just said that to keep you thinking of the data flow.

The MoCA adapter makes the coax look like Ethernet. To do that it has to modulate and demodulate the Ethernet frequencies. Think of the coax as a layer cake. The first layer is carrying modulated SDTV channels, the next layer is carrying modulated Digital HDTV channels, another layer is carrying modulated digital internet data. The MoCA adapter modulates the Ethernet signal and adds it as another layer on the coax (above 1Ghz).

Do you understand why you use the MoCA input now? You see the continuity of the connections?

When you think about it, it's really very logical and straight forward. You only need to design one adapter, all wired the same way, and it fits everywhere in the network.

You were trying to wire point to point which disregarded or negated the MoCA adapters ability to modulate/demodulate the Ethernet signal and carry it on the coax.

I'm absolutely certain that I'm missing something here.. but if you place the first MoCA adapter in the Cable line before the Cable Modem, and then tie the OTA antenna into the coax further down the line, is that right? Won't the CableCo frown on that?


Or if the incoming Cable line is truly not connected to the other coax wiring (as scottyja stated in the quote), how does the first MoCA connect to others? Another splitter and coax?

I'm trying to understand.. not antagonize...

Possibly, but only because he should have a filter where the cable comes into his house to block the OTA frequencies from back feeding to the main cable. It has nothing to do with the placement of the MoCA adapter though. It is also important to use a MoCA POE filter as I have said many, many, times.

The cable company will have no problem with the MoCa adapter, it's invisible to them, if installed properly. Cable companies use MoCA for whole house, multiple TV's, DVR installations. Many DVR's have built in MoCA.



It's OK. I have had a realization that no matter how I say it or how may times I say it, people are having a hard time understanding it.

In scottyja second diagram, thumb nail attachment, he connects all of the cables together via a splitter.

• Main cable in
• splitter - one in two out
• one line from this splitter to the first MoCA input
• second line from splitter one on to splitter number two
• splitter number two joins the other home runs

The MoCA adapter input is really an input/output. All the coax runs have been joined via the splitters. Again you need to use a MoCA POE filter in front of the first splitter.

You under stand when you add a wireless router to a cable modem, the PC sees the cable modem via the router connection and can talk back and forth to the router -> modem -> internet over one cable?

The MoCA adapter is really no different. It modulates/demodulates the Ethernet signal and sends it over the now Ethernet over coax network via one connection; the MoCA coax input connection. All of the coax cables have to be joined at some point to make the network backbone. If a coax cable is not attached to the network it will not see the Ethernet signal from a MoCA adapter.

Aha! I was missing something. I had overlooked the existence of this "second diagram" . . .

If you read through my long post to him, it explains what you're missing and how his office diagram part is now correct.

Once you catch on, MoCA is falling off a log easy to set up. The key is to set up the first MoCA adapter correct to establish the network.