multiple SSID / Network Segregation

Good to know:

Channels are by radio, not SSID.

(source: https://supportforums.cisco.com/thread/2104273)

Example

(AP#1) Channel 1

SSID - TEST1

SSID - TEST2

(AP#2) Channel 11

SSID - TEST1

SSID - TEST2

As you can see your TEST 1 will broacast on channel 1 and 11 ...

Network Segregation 
(source: http://www.techsupportforum.com/forums/f31/network-segregation-291997.html) 

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1. Reset both routers to factory defaults by holding the reset button for 15 seconds with power on.
2. Change the base address of the secondary router to 192.168.2.1.
3. Connect the primary (insecure) router's WAN port to the cable modem.
4. Connect the secondary (secure) rotuer's WAN port to one of the primary router's LAN ports.
5. Configure the wireless section of each of the routers to your desires, making sure you use two non-conflicting channels, i.e. 1, 6, and 11 are the good ones in the US.
6. Do NOT disable DHCP anywhere.

This will accomplish the desired result.

Note, the secure environment is the secondary router that is connected to the primary router, which is in turn connected to the cable modem. The primary router is the one that is for "public" use.