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Still waiting for Cox to have a range extender for Gigablast. Do we have an ETA?
There are 2 types of extenders: MoCA and WiFi. If you go with MoCA, you can only buy or rent the "pods" from Cox. If you go WiFi, you can use any commercially-available set.
A more important question is will Gigablast ever provide Gigabyte speeds!
First of all, "Gigablast" is just Cox's marketing scheme for referring to their 1 Gbs download speed plan. There is nothing unique or proprietary about it.
Next, you are not corralled into using Cox's "pods" to enhance your WiFi coverage, whether you run the Panoramic modem/router or not. As but one example is the Netgear NighthawkX4 WiFi mesh extender ( https://www.netgear.com/home/products/networking/wifi-range-extenders/EX7300.aspx ) that can handle 2.2 Gbs (It's one of the really pricey ones but the first that came to mind).
Some Cox reps may tell you otherwise (see the forum moderator's reply to your query) only because they don't know any better.
Finally, there are other methods available to enhance or extend your WiFi coverage. Here's a web link that provides some basic info: https://www.actiontec.com/wifihelp/wifibooster/differences-wifi-booster-wifi-extender-wifi-repeater/
You also don't have to buy an Internet modem from Cox...you also don't need to rent a router from Cox...and, as twice-previously mentioned, you don't have to rent wireless network-extenders from Cox. (Some day this will be true for cable boxes.)
If you buy an Internet modem, it only needs to be compatible on the Cox network, aka Cox Certified. Modems at home have to speak the same "language" as the headend of an ISP.
If a network router, extender or device is capable of wireless, it only means it's WiFi Certified. It's one standard. You can buy a WiFi Certified router from one company and WiFi Certified extenders from another company...and they'll work. There may be some features by one company that won't work with the other company...but wireless networking will work.