If you are getting 50Mbps, you have a labout issue. You need more pods or better placement. The pods are low power and designed to be more densely implemented than the normal access point. I have seven for a 2500sf house and that’s using wired backhaul where placement is less critical.
I regularly get 90-100Mbps with the original Plumes using wireless backhaul (measured using iperf3).
Make sure you are waiting 24 hours after each change before testing and that the client device you are using to test has roamed to the closest pod. Start from the point of your Internet connection and move outwards to make sure that the intrapod connections are good.
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Forgot one other tip. If you are experimenting with different placements using wireless backhaul, you have to wait for the great optimizer in the sky to run before testing it. You have to wait 24 hours to be sure it ran. I don’t know a way to tell when it last run and the only way I know to force it is by contacting Plume support (don’t know if it’s an option if you are running the Comcast versions).
Also, testing any of the mesh systems is a giant PITA as it’s impossible to force the client to use a particular band and access point for a connection. Maybe it’s possible with a few specific devices but I don’t know any way to do it with a macOS/iOS device. Just set it up with a best guess and don’t mess with it unless you encounter a problem with performance being a noticeable problem in some part of the house. Unless you want to become a WiFi engineer in your spare time...
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I’ve got the normal Plume Pods rather than the Comcast version but AFAIK, they are architecturally the same product. I’ve never done better than about 120Mbps when the pods are using wireless backhaul (the inter-pod connection). When I use wired backhaul, speeds jump to 240-325Mpbs. That’s measured using iperf3.
Wireless performance is effected by a huge number of factors so every situation is unique and almost impossibly complex to analyze without specialized expertise and knowledge. To a large extent, customers and the Comcast techs are largely just stumbling around in the dark trying to guess at the best placements for the pods and if the results observed are “as expected” or show a problem. I know that when I did my initial configuration, I ended up sending a layout for my house to Plume tech support and they worked with me to fine tune the pod placements based on the strength of the intro-pod connections. I have no idea if a Comcast customer to tech can get access to the same kind of support.
The “rules of thumb” I’ve developed over the past 9 months of using Plume are:
1. Whenever possible, use wired rather than wireless backhaul with Gigabit Ethernet, MoCA 2.0 or better, or Ethernet-over-Powerline (latest gen only) connrctions. That dramatically decreases complexity and increases performance.
2. Place the pods in the rooms where you most heavily use WiFi. Ideally, you want a near line of sight connection between the client and the pod.
3. Try to have no more than 2 walls and 40’ between two pods that are using wireless backhaul. As soon as the backhaul has to switch to 2.4, performance is compromised. RF obstructions (think rebar in concrete walls, HVAC ducts and equipment, larger mirrors) are big issues.
4. Don’t obsess about benchmarked performance. The reality is that a 80-100Mps stable, low-latency connection for all your wireless clients is plenty of performance for almost all devices all the time.
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Comcast doesn't do anything that limits your ability to install different WiFi options. You can install anything you want as long as you have the necessary knowledge to make the required networking configuration changes. I'm running six Plume pods which replaced three eero access points which replaced two "standard" WiFi routers/access points. None of those changes were required, I just like experimenting when different options.
But you are on your own. Comcast doesn't (yet) have a whole-house WiFi service offering. If you want a mesh or other multi-access point solution, you've got to work figure it out. I found both eero and Plume to be helpful with any questions. The most basic implementation is to install the new equipment in bridge mode and let it run side-by-side with your Comcast equipment with the same network name. All you need is an open Ethernet port on your current network. A more advanced implementation would be to also disable WiFi on your Comcast equipment to reduce interference and give you a single point of WiFi management.
Be aware that mesh isn't "magic". In particular, neither eero nor Plume provided much help out of the box with figuring out the number and placement of wireless points beyond a couple of very broad rules of thumb. Tech support was able to provide some additional assistance but it's still more art than science. I have Ethernet and MoCA connections in most rooms in my house which largely made placement a non-issue which makes placement much easier. I experimented with wireless "backhaul" (the connections between the wireless access points) just to get some experience with it but switched to wired as it is about 1000x easier and better.
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