Status update.
1. 845L is to be found at 850L (I really don't know why, for me it is not logical)
2. Your answer was sufficient. I has some problems with the forum and I lost my way. (Thanks for the reply)
Of course is not usual to buy a router and only use the switch and the access point. In my case it was best value for money.
And I know the router-part does not work as expected. But I'm happy.
Wireless is good, although I do not use the 5 GHz, because it is by far not strong enough.
Shareport Web Access. I use a 15,5 GB SD-card, just for fun and experimentation.
Switch OK , I do not use the yellow (WAN) port