From Xfinity:
In the coming days, we’ll be doing work in your neighborhood to continue the evolution of our next-generation Xfinity network. This will ultimately allow us to offer equally fast, multigigabit upload and download speeds and is yet another example of how our network is constantly evolving so you can have a powerful connection today and a faster, more reliable tomorrow.

We’re scheduled to do work in your area on 12/05, affecting service [in your neighborhood]. While we will make our best effort to stick to the dates provided, sometimes factors beyond our control – like weather – may cause us to shift the schedule. We’ll confirm via text the day before work starts.

How this work will affect you:

You can expect service outages while our teams work to make these enhancements. They will work as quickly and efficiently as possible to limit the duration of these outages and finish work within the day. This downtime will affect all your Xfinity services, and if you are an Xfinity Voice customer, be aware that you will not be able to call 911 from your wired phone line during this time.

How to stay informed:

Please take a moment to confirm your mobile number is up to date on your account. We will send automated text updates, including a reminder the day before work is scheduled to begin and when service is restored.

Confirm mobile number by logging in to your Xfinity account.