MoCA light wont come on

Yeah, those FiOS gateway models (along w/ the older MI424-WR) support both a MoCA WAN connection with the ONT, as well as bridging for a MoCA LAN. The key difference between these gateways and the OP's setup is that these devices all establish the MoCA WAN link with the ONT using MoCA 1.1 Band C (channel C4), limiting throughput to 150 Mbps ... but leaving the entire MoCA Extended Band D frequency range available to the MoCA LAN. The OP's setup achieves higher WAN throughput, up to 400 Mbps, by using a single MoCA 2.x channel, in the D-Low range ... but leaves just the MoCA D-High range available for MoCA LAN use.

The NVG468MQ, on the other hand, is functionally similar to the G1100 ... minus the built-in MoCA WAN bridge. (Both devices support standard MoCA 2.0 for a MoCA LAN.) In the case of the NVG468MQ, when the preferred Ethernet WAN connection isn't possible, Frontier offers a special MoCA adapter, the Arris MEB1100, able to link to the legacy ONT MoCA WAN bridge, using MoCA 1.1 Band C (channel C4), but similarly limited to 150 Mbps throughput (better than 100 Mbps owing to the MEB1100 sporting a GigE network port). If the 150 Mbps is insufficient, and a direct Ethernet WAN connection remains impossible, that's where Frontier is using the FCA251 MoCA 2.5 Band D adapter to effect the MoCA WAN link ... while creating competition for the MoCA Extended Band D frequency range, and impacting maximum throughput.

@kzb716 Have you contacted Frontier directly? The FCA251 adapters introduce a new wrinkle to setting up a MoCA LAN, so they really do need to help with the configuration.

As mentioned in a parallel post, another option is relocating the router to a location where a direct Ethernet WAN connection can be established with the ONT, eliminating the need for the FCA251 adapters and the competition for the MoCA Extended Band D frequency range.

@kzb716 FWIW, I've posted to DSLReports seeking advice on the issue.

See: https://www.dslreports.com/forum/r33078298-Internet-FCA251-MoCA-WAN-configuration-and-MoCA-LAN-coexistence

@ploog I just found this thread after creating my post (https://www.gocoax.com/forum/everything-for-moca/3x-frontier-wf-803ft-for-lan). So, from what I understand, if my router has an ethernet connection to the ONT, I could use 3+ FCA251 adapters, all set to LAN, with one connected to the router & coax and the rest connected to coax? Basically a MoCA 2.5 LAN?

@kzb716 "I am planning on having 2 remote goCoax locations in addition to the frontier location"

You'll need 3 goCoax adapters total, but @goCoax really needs to step in here to assist with this, to confirm the FCA251 "WAN" frequency configuration and the custom configuration required for the retail goCoax adapters to coexist with the FCA251 MoCA WAN connection. (It is my understanding that the FCA251 adapters are operating in the D-Low frequency range when set to "WAN" ... but this needs to be confirmed. Contact Frontier to get the details, if you can.)

'gist: The FCA251 adapter is making a MoCA connection with the ONT location to supply the WAN connection over your coax (rather than a direct Ethernet WAN connection), and this MoCA WAN link, with the FCA251 set to "WAN," is operating in the MoCA D-Low frequency range ... enabling up to 400 Mbps WAN throughput. So, to establish a MoCA LAN, you'll need to set up a separate MoCA network, configured to operate in the MoCA D-High frequency range. This is why you'll need 3 MoCA adapters; the FCA251 adapter is dedicated to the MoCA WAN, so you'll need a separate MoCA adapter at the router to bridge for the MoCA LAN.

Similar to this schematic: https://i.imgur.com/Frt0qFN.png

Key points Re: the MoCA LAN setup:

• One retail goCoax MoCA adapter at the router location to function as your main bridging adapter for the MoCA LAN;

• Then one retail goCoax MoCA adapter at each of your two remote locations;

• All MoCA LAN adapters configured with MoCA privacy and to operate in the D-High frequency range;

• Due to operating at D-High, only 3 channels are available for bonding, so maximum shared throughput for the MoCA LAN will be 1200 Mbps, rather than the 2000 Mbps possible in a 5 channel configuration using all of the MoCA Extended Band D.

• With the MoCA WAN operating at D-Low, the maximum supported WAN throughput will be 400 Mbps shared (so potentially as low as simultaneous 200 down and up).

SO... this is why having an Ethernet WAN is preferred, or even moving the router to a location where the Ethernet WAN connection can be made.

@kzb716 I'd sent another user down this path, and had assumed things had worked out. Sounds like @goCoax needs to chime-in on that thread, as well.

See here: https://www.reddit.com/r/HomeNetworking/comments/lz6266/moca_difficulty/

Two followups...

If you see this and have the time/inclination, I'd be curious as to what you find at the ONT for connections and devices. (I'm curious as to whether there is another FCA251 at the ONT location, connected to the ONT's Ethernet WAN port.)

Also, what do you measure for your download/upload speed when hard-wired via Ethernet to the NVG468MQ router? And what download/upload are you paying for (and should be seeing)?

Background: The FCA251 is typically employed by Frontier as an alternative WAN connection between the ONT and router (an alternative to the built-in MoCA 1.1 WAN or an Ethernet WAN connection). Aside from the connection not being what is intended when installing a retail goCoax MoCA adapter in a remote room (i.e. linking to the ONT's WAN connection), I expect (and would hope) that the FCA251's "WAN" setting both configures the adapter for a D-Low operating frequency range but also sets MoCA privacy for the connection, preventing other non-FCA251 devices from connecting.

If looking to leverage MoCA to extend your router's LAN connectivity, your router will need to have a built-in MoCA LAN bridge or you'll need to use a standalone MoCA adapter to act as the bridge between the router LAN and your coax ... and then additional MoCA adapters in remote rooms, as needed, configured to connect with the MoCA LAN bridge. (With the FCA251 required for the MoCA WAN connection, the "LAN" MoCA adapters will require manual configuration to allow the "WAN" and "LAN" MoCA networks to coexist on the shared coax.)