Very Computer

Hi,
we have bought few wireless router Cisco 1200. Our idea is to make a
wireless network like this :

_____________                         _____________
| Cisco 1200 |----radio interface-----| Cisco 1200 |-------( internet )
--------------                        --------------
                                             |
                                        radio interface
                                             |
                                       ______________
                                       | Cisco 1200 |
                                       --------------
this solution doesn't seem to work.
Is it possible ? can this impossibiliy can come from the fact that a
radio routing involve the reservation of the half of the radio bandwith ?
Our actually working solution is

_____________                         _____________
| Cisco 1200 |----radio interface-----| Cisco 1200 |-------( internet )
--------------                        --------------
       |
radio interface
       |
______________
| Cisco 1200 |
--------------

thanks for the reply