Okay, I benefitted from reading this thread, so here's my experience with running MOCA on a Shaw Bluecurve XB6 Gigibit modem.
I ordered a single Translite TL-MC84 MOCA adapter off of Amazon. I figured I'd end up needing two, but I'd start with one just in case it worked.
I wanted to get Ethernet from my AV setup in my living room, where the modem and a separate WiFi router are located, to a coax outlet in an upstairs bedroom now being used as an office.
I began by installing a POE filter at the coax service entrance next to the electrical panel. (Aside: later, I did a test with and without the POE filter and it made no difference to internet speed - no surprise there, but I was curious).
I got a decent quality 2-way splitter and installed it on the main coax line and connected both my living room coax and bedroom coax to the splitter. I confirmed the bedroom coax line (one of many unused lines) by jumping the central conductor to the shielding at the bedroom outlet and checking continuity in the basement. The splitter had a ground lug so I grounded it to the ground strip nearby.
I went into the modem administration, took it out of bridged mode (rendering my external WiFi router inoperative, more later), and turned on the resident moca function of the XB6 modem. MOCA adapter installation was easy, simply connect the "moca" coax port on the adapter to the coax outlet in the bedroom, connect to wall outlet power, and run an Ethernet CAT5e or CAT6 cable to the computer.
With a single MOCA adapter installed at point of use in this way, I saw speeds comparable to direct Ethernet connection to the modem (450 to 900 Mb/s depending on time of day, alignment of planets, who knows why Shaw speeds vary so much?).
Obviously the shortcoming of this setup is that I couldn't use my external WiFi router with all its features, so I ordered a second Translite MOCA adapter and when it arrived I installed it in the living room. I reset the modem to bridged mode which automatically turned off the modem's moca capabilities.
Coax from the wall jack to the "MOCA" connection on the adapter. Coax from the adapter (it has an output jack; if your adapter doesn't have a coax output jack you'll need a splitter here) to the Shaw modem, Ethernet from the modem to the wifi router in the normal way, and finally a short Ethernet cable from one of the wifi router LAN ports back to the MOCA adapter.
Head upstairs to the bedroom, wait for the moca connection to be made by the second adapter, and I now have really fast internet upstairs (max I saw on Ookla was 880 Mb/s) without the pain of WiFi.
Hope this helps someone. The Translite adapters were $89.99 each on Amazon and are plug and play. The first one was missing the instruction booklet and an Ethernet cable, but not to worry. Instructions aren't needed.The POE filter was $9.99 on Amazon.
