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TDL shepherd
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I'm using a MoCa spliter left behind by the previous Direct TV service I had.
As already noted the standard green label Directv splitters are not optimized for MoCA on CATV. DECA which is Directv's version of MoCA uses the frequencies 500-800MHz normally used by CATV, which is why you can't mix DECA with CATV and why you can't use MoCA(1100-1675MHz) with Directv.
Worse, they ARE optimized for DirecTV's MoCA (DECA), which means they have lower output port-to-port isolation in the DirecTV MoCA (MoCA E-band) frequency range, 400-700 MHz (bad for your TV signals) and higher port-to-port isolation at satellite TV frequencies, 950-2150 MHz (very bad for CATV MoCA, i.e. MoCA D-band).

So, you *will* want to replace the DirecTV splitter with a MoCA 2.0-compliant splitter per fcfc2's recommendation above (avoiding the 2 models labeled "DirecTV," as stated). It's difficult to provide a more specific recommendation, not knowing where your cable modem is located. Generally, you wouldn't want a single 4-way split as the current setup appears to have; instead, you'd want to deliver the best possible source signal to your modem and CATV tuner (i.e. the BOLT), with priority usually going to the modem. The MoCA-only feeds can be hung from a secondary splitter.

As for the "PoE" MoCA filter, you'll definitely want to get one installed. It's not just to keep your signals secured within your home, but to improve MoCA performance by reflecting the MoCA signal back onto the lines. In fact, if you were to have one on that DirecTV SWM splitter, it might help overcome the high port-to-port isolation -- though you'd *still* want to replace that splitter.
 

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TDL shepherd
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As for the "PoE" MoCA filter, you'll definitely want to get one installed. It's not just to keep your signals secured within your home, but to improve MoCA performance by reflecting the MoCA signal back onto the lines. In fact, if you were to have one on that DirecTV SWM splitter, it might help overcome the high port-to-port isolation -- though you'd *still* want to replace that splitter.
Page 20 from PCT employee Doug MacLeod's 'MoCA Basics' presentation provides a great illustration of the performance benefit of the PoE MoCA filter.

Font Line Parallel Screenshot Number
 

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TDL shepherd
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Right. That's a tuning adapter, for assisting in tuning Switched Digital Video (SDV) channels (huh?) -- which you may or may not need, depending on your local provider and your programming package.

I especially didn't like the connection configuration that requires both coax and eithernet connections to the Bolt,
Not sure what you're referring to, there. If your BOLT is networked via MoCA, so no Ethernet cable is currently connected, installing a tuning adapter wouldn't change that.

*IF* you had to install the tuning adapter (TA) with the BOLT, you'd just need to make sure the BOLT and TA were both directly-connected to the coax lines (via a splitter, rather than the BOLT connecting to the "RF/TV Out" port of the TA), and you'd also connect a USB cable between them for control communications.

The splitting of the signal to each device is typically recommended to ensure the BOLT wouldn't suffer any signal issues for non-SDV channels should the TA be offline for any reason. However, to ensure continued MoCA connectivity for the BOLT, you MUST use this split, direct connection approach because the "RF/TV Out" port of a tuning adapter does not pass MoCA signals (or at least not without severe loss). Additionally, it's possible that the tuning adapter *may* need a protective MoCA filter installed on its input, for MoCA installs, to ensure that the TA isn't affected by MoCA signals (and vice versa); see >this post< for more on the protective MoCA filter for TAs.

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Which is all basically the same as this older post I was finally able to find, though this older post includes a helpful diagram from Cox's TA installation guide -- which applies to any "TA w/ MoCA" installation...
First, there's no Ethernet port on a tuning adapter, so that's not an option! ;) It's likely they/you meant "USB," which *does* need to be connected between the TA and TiVo DVR, once all the other connections are made. Without the USB connection between the TiVo and TA, the TiVo doesn't really even know the TA is sitting there.

As for the coax lines, the recommended approach is, yes, to use a splitter to directly connect both the TA and TIVo DVR to the coax lines, rather than using the TA's "RF/TV Out" port... as this pass-through signal can be affected by the tuning adapter's power state.

Lastly, one more tweak may be needed (is recommended) depending on whether you're also using MoCA (coax) networking. If yes, then you MUST use a splitter as described, just above, and it's recommended that you install a MoCA filter on the coax input to the tuning adapter to protect it from MoCA signals. (see here for more info) Note that this recommendation is different from the MoCA installation requirement to install a MoCA filter at the cable provider's point-of-entry (PoE) to the home.

Step #5 in the Cox tuning adapter setup document provides a good diagram showing how to properly connect a TiVo DVR and tuning adapter in a MoCA environment (excluding any Ethernet connection you may require for the TiVo). And, yes, this connection setup applies to TWC tuning adapter installs, as well, and a non-MoCA install would be wired effectively the same way, minus the MoCA filter on the TA's input.

 

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TDL shepherd
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I have ordered Holland splitter and filter
If you ordered just the one splitter, I'm going to re-post an excerpt from above, in case it was missed...

It's difficult to provide a more specific recommendation, not knowing where your cable modem is located. Generally, you wouldn't want a single 4-way split as the current setup appears to have; instead, you'd want to deliver the best possible source signal to your modem and CATV tuner (i.e. the BOLT), with priority usually going to the modem. The MoCA-only feeds can be hung from a secondary splitter.

It's also difficult to imagine you don't have at least one other existing splitter somewhere else, which may also warrant an upgrade, assuming the cable modem/gateway is connected to the same coax lines.
 

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TDL shepherd
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Here is an updated block diagram showing the position of the cable co. provided splitter. If I understand the advice given here I will be replacing the Direct TV splitter with a Holland MoCa splitter. I also plan to install a Holland POE MoCa filter on the input to the new splitter. What do you think?
How is your MoCA network being created, by what device?

The diagram is an improvement, thanks, but it doesn't indicate what Ethernet connections might exist, or if you have a separate router... and without knowing this info, especially where the MoCA-to-Ethernet bridge is located, I'd have to say put the "PoE" MoCA filter on the actual point-of-entry, the input to the "cable provider splitter." If the BOLT is creating your MoCA network, you could improve your MoCA performance a bit (and the signal strength at the cable modem a hair) by installing the "PoE" MoCA filter on the input to the secondary splitter (soon to be the Holland MoCA model).
 

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TDL shepherd
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Yes the MoCa comes from the coax "in" connector of the Bolt. I do not plan to use ethernet connections at all anymore.
Ok, so just the one Ethernet connection to the BOLT, then, right?

If so, yes, you could install the "PoE" MoCA filter on the input to the splitter feeding your rooms, rather than the initial splitter. The coax line running to the modem would NOT have a MoCA signal.

p.s. With just 3 coax connections shown, hopefully you took fcfc2's advice...
Also if you know you don't need that extra port on the 4 way splitter, consider replacing it with a 3 way to get slightly less signal loss.
... and opted for the unbalanced 3-way splitter model, to deliver the maximum signal strength to the BOLT (feeding the BOLT from the low-loss 3.9 dB port).

p.s. And no need to upgrade the initial 2-way splitter to MoCA-compatible if the PoE MoCA filter will be installed on the input of the secondary splitter.
 
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