what is the minimum download speed !!!BASED ON MY PLAN!!!

@6960298 My apologies if we upset you, that is not the intention. In short, there is not a minimum speed provided, because there are to many variables to factor into minimum speeds. While your subscription may be up to 400/10 Mbps, if you have device connected to your network that will only handle let's say 100 Mbps; that would be that devices max capability. Sounds like you have a pretty good understanding of services. Please let me know if there are any follow up questions I may answer for you. 

Let's take customer premise equipment out of the calculation, completely.   Considering ONLY your network up to the pedestal or other premise interchange point, what minimum speed can Xfinity accommodate?

Imagine that a tech had the most high-end equipment available to them, like top-of-the-line modem and laptop, and they connected to your network at the pedestal.   What minimum speed would they get there?

That's a great question! With no other mitigating factors, the minimum speed to your modem should be 400 Mbps down and 10 Mbps up. In most areas, your service should be slightly overprovisioned by 5-10%, giving you a baseline download speed marginally higher than 400 Mbps.

I know that when I had Blast! Pro in my own home, the download speed to my modem was usually around 420-430 Mbps, and the upload speed was about 10-11 Mbps. I was usually able to see speed test results to my mobile device above 400 Mbps, as long as I was in the same room as my router, but my laptop would rarely get above 74 Mbps, because it had an older 2.4 GHz network adapter. I hope that helps to clarify things a little better.

I am not getting 400mbps down.  Usually I am getting 300mbps down--and that is fairly consistent.  But it does dip to less than 250 down for about an hour or so, seemingly intermittently.

So you claim that 400 mbps down is the MINIMUM?  Interesting.  A comcast tech told me that I should expect 250-400.  Maybe you can now see why I find this confusing.

As far as "mitigating" factors, I have a brand new modem (Netgear CM1000) and I run speedtest-cli from the router that is immediately connected by ethernet cat 5e cable (which is the type which came with the modem).  At the router end, there is a 1000mbps ethernet adapter.

But that wasn't why I was asking.  For me, 300mbps down is satisfactory.  I just wanted to hear someone tell me what the minimum SHOULD be.  And it is curious why the speed drops to 250 (or even lower in some instances of when it slows down) at times, even when I am not really doing anything that would put much traffic on the wire.

The mention of 400 Mbps download being the minimum was in response to your question of if a tech had the most high-end equipment available to them, such as top of the line modem and laptop. If you are connecting via Wi-Fi there are factors, that even in the above scenario (such as traffic, how many devices are connecting and what they are doing with the internet i.e. gaming, video streaming, etc) you may still not see the 400 Mbps. If you've been experiencing slower than normal internet we definitely would be more than happy to take a look and see what's happening and how we can help resolve it. 

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