Hi Burak,
Have a look at the following info;
Understanding Repeater Access Points
A repeater access point is not connected to the wired LAN; it is placed within radio range of an access point connected to the wired LAN to extend the range of your infrastructure or to overcome an obstacle that blocks radio communication. You can configure access point/bridge radio as a repeater.
The repeater forwards traffic between wireless users and the wired LAN by sending packets to either another repeater or to an access point connected to the wired LAN. The data is sent through the route that provides the best performance for the client. When you configure the access point/bridge as a repeater, the access point's Ethernet port does not forward traffic.
You can set up a chain of several repeater access points, but throughput for client devices at the end of the repeater chain will be quite low. Because each repeater must receive and then re-transmit each packet on the same channel, throughput is cut in half for each repeater you add to the chain.
A repeater access point associates to the access point with which it has the best connectivity. However, you can specify the access point to which the repeater associates. Setting up a static, specific association between a repeater and a root access point improves repeater performance.
To set up repeaters, you must enable Aironet extensions on both the parent (root) access point and the repeater access points. Aironet extensions, which are enabled by default, improve the access point's ability to understand the capabilities of Cisco Aironet client devices associated with the access point. Disabling Aironet extensions sometimes improves the interoperability between the access point and non-Cisco client devices. Non-Cisco client devices might have difficulty communicating with repeater access points and the root access point to which repeaters are associated.
Note Because the access point/bridge creates a virtual interface for its radio interface, repeater access points associate to the root access point twice: once for the actual interface and once for the virtual interface.
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Note You cannot configure multiple VLANs on repeater access points. Repeater access points support only the native VLAN
From this doc;
http://www.cisco.com/en/US/products/ps5861/products_configuration_guide_chapter09186a00804158b3.html#wp1051801
Configuring a Repeater Access Point
From this doc;
http://www.cisco.com/en/US/products/hw/wireless/ps4570/products_configuration_guide_chapter09186a0080184aa1.html#1034763
Default Configuration
http://www.cisco.com/en/US/products/hw/wireless/ps4570/products_configuration_guide_chapter09186a0080184aa1.html#35335
Setting Up a Repeater
http://www.cisco.com/en/US/products/hw/wireless/ps4570/products_configuration_guide_chapter09186a0080184aa1.html#17823
Guidelines for Repeaters
Use repeaters to serve client devices that do not require high throughput. Repeaters extend the coverage area of your wireless LAN, but they drastically reduce throughput.
Use repeaters when most if not all client devices that associate with the repeaters are Cisco Aironet clients. Non-Cisco client devices sometimes have trouble communicating with repeater access points.
Make sure that the data rates configured on the repeater access point match the data rates on the parent access point.
From this doc;
http://www.cisco.com/en/US/products/hw/wireless/ps4570/products_configuration_guide_chapter09186a0080184aa1.html#36975
Hope this helps!
Rob
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