What exactly is a "solid non-interleaved upstream" and how can I achieve this?
I find the delays a real problem. In my last test earlier this evening the chimes worked almost instantaneously, but it was a good 10 seconds before the mobile phone responded. I think this is long enough for an impatient delivery person to go away.
The WiFi extender seems to have cured the occasional total failure to get any indication of a ring on the phone. But I've not used it enough to be sure yet. Tomorrow morning will be interesting when my wife's carer arrives soon after 8 am. So far the ring has failed for her every time (3 out of three). I am wondering if the problem is not really signal strength, but (1) the fact that the router's WiFi is probably in "sleep mode" and takes time to wake up and/or (2) the carer carries two mobile phones (private and work) and they are both trying to negotiate WiFi connections at the same time as the doorbell is trying to communicate.
I also have a problem with the chime units.In order to be reasonably sure of hearing the chime I need three downstairs and 1 upstairs, Three out of the four work fine, but the 4th should be in the kitchen. But that one does not receive a strong enough signal from either the router (upstairs) or the extender (in the entrance hall)
Like you are going to decide on which type of broadband to get in order for a doorbell to work!