Installation and commissioning:
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Simply "easy". I am what routers, computers, etc. As for fairly fit and have always used a lot to play around with the stuff until it all "ok" ran. With AirPort Extreme, it is so simple that it already contributes almost to the amusement ;-)
Unwrapped, connected to a LAN cable to the WAN port and have plunged the part in AirPort Utility (Mac / iPhone / iPad, etc.). I have forgiven only private WPA2 password and that's it. After a few days I simply times turned off the WLAN of the Fritz box and was speechless. I had perfect reception anywhere. The AirPort is now in the living room and even 1080p streams to the upper floor to the ATV is not a problem!
Conclusion:
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Super strong wireless for unfortunately a lot of money. But in my opinion there is hardly comparable. I have tried many things.
ADDENDUM (the Airport Extreme is also Telekom Entertain compatible):
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If an entertainer Receiver (Telekom Entertain) are used, the following notice!
I have / had since today is also the problem with the IGMP v3 or multicast flooding of the network by the receiver and entertainers have found a solution!
AirPort Extreme offers in Airport Utility Option "Network" -> "Network Options" -> Enable IGMP Snooping. Simply activate and the network or the Airport Extreme now works again with activated Entertain receiver!