The solution for me was to use a PoE Splitter, costs 14 EUR, and the plug will fit well.
PSC = 1
I would have expected but that this is already installed EUR 14.- device in access point regardless.
Now show me the Web Console from TP-Link SG3424P Switch on the power consumption of the router. Nett.
The fact that a 300Mbps Access Point connected with only 100Mbit Ethernet cable to the LAN should irritate anyone, because 300 Mbit are only the gross rate. Of course, the access point should be connected to a switch, not to an Ethernet hub which passes the packets to all the cables simultaneously and therefore the 100Mbit LAN cable is unnecessary.
[...]
Since the last firmware update (3.14.8 Build 130 828 Rel.63678n) to get my Chrome browser only to the router where the latter assigns a DHCP address or so, so the initial setting after a factory reset. If the router in the network and gets an IP address assigned, then Chrome makes a redirect to a URL (port) that does not exist. No idea why. With IE's access.
These are annoying little things, overall I am very satisfied, especially with the things that really matters as coverage.