2 airports working together.

I have the new airport extreme (the large model) and the previous one (the "apple tv" design).

If i connect them together i do get the wireless network from both; but the quality *****... no download and nearly no upload speed. The airport config programm shows green dots behind the airports....

I try below to descripe how the connections are. Tell me please. What am i doing wrong

ziggo (non wireless) cable router

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network cable

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new airport wlan port - creating a wifi network

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networkcable

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old airport - wlan port - extending the same wifi network

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networkcable

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_______________

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computer printer

Help would be oh so welcome