Extend my old wireless network with help of Apple Airport Express

samratm

Right off the assembly line
Hello,

I have a one year old Siemens SL2_141 router which I was using to create a WiFi Network and simultaneously use the Ethernet port to connect to my PC.

Now recently I purchased a new Airport Express, and I am not able to extend my old Siemens WiFi Network with the help of this, it shows me "This network can't be extended". Can anyone help me if I am missing something here.

Do I need to change any other settings on my old router.

I have uploaded few snapshot of settings of my old router here
 
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