What does "requires that your router support bonded moca 2.0" mean? can't i just use ethernet to ethernet via coax and get full speed bridging?

That statement is a little confusing. If you only want to purchase one bonded MOCA adapter to extend the network via coax, you will need your fios/cable modem with router to support MOCA 2.0 bonded. If you are using the two adapters to extend out the network to two different locations via coax, you will need your fios/cable modem with router to support MOCA 2.0 bonded. Otherwise like most of us, we will need to use one of these adapters at the off the shelf router because most of the certified Doscis 3.1 cable modems will not have a built in router that also supports bonded Moca 2.0.

I already have moca built in, can I use each of these in other rooms to bring high speed data to them instead of using one to connect the router?

MoCA acts like an ethernet bridge, meaning it "converts" Ethernet to coax and back again, so that devices connected appear to do so over Ethernet (except for delay differences). If you have MoCA in your house, and it uses the LAN channels (not WAN), and uses no privacy, then this device can connect to that and appear to be part of the same network. For example, for those with Verizon FiOS, they have two MoCA channels; one WAN (C4 - ONT to the router) and one LAN channel (D-channel). The WAN channel has privacy enabled, and most commercially-available devices won't communicate on that WAN channel. However, the LAN channel has privacy disabled, and most commercially-available devices will communicate on that channel. The router actually has two MoCA transfceivers (one for WAN, one for LAN). If you have a MoCA device that already communicates over LAN (i.e., Tivo box), then it can connect to the router, and likewise, you can use one of these devices (Actiontec) to join to the MoCA network to provide Ethernet to another room. The limit for MoCA 1.1 is 16 devices, AFAIK, but this is a MoCA 2.0 device and I can't recall that device limit, but it has to be at least 16 devices. Note that the router serves as a device, and is most likely the NC (Network Coordinator), depending on your coax topology and best signal device.

What comes in the box?

Two Ethernet to coax adapter boxes, two Ethernet cables, two short coax cables with female connectors and a coax splitter.

Do any of these adapters allow input via Ethernet? All diagrams appear that input is via Coax only. My modem and current wiring is ethernet only.

I guess it depends on how you're defining "input". The idea is that you're converting RJ-45 to Coax, connecting via Coax then converting back to RJ-45. So if your Modem is Ethernet (RJ-45) and you connect that to the Actiontec and connect the Actiontec to Coax then at some other point in your Coax wiring, you connect the other Actiontec and connect its RJ-45 to something (let's say a network switch with a couple of computers on it) then those devices can talk Ethernet to your modem via the Coax wiring by virtue of the Actiontec converting RJ-45 to Coax back to RJ-45. Does that help?

Data Link Protocol	Ethernet
Data Transfer Rate	2.5 Gigabits Per Second
Compatible Devices	MoCA/Ethernet/Wireless Extenders/coax
Hardware Connectivity	Ethernet
Item Weight	0.3 Pounds
Item Dimensions L x W x H	4.5"L x 2.2"W x 1.1"H
Color	Black

ScreenBeam MoCA 2.5 Network Adapter for Higher Speed Internet, Ethernet Over Coax - Single Add-On Adapter for Existing MoCA Network (Model: ECB6250S02), Black

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