Replecement of router

Hi,
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For you to be able to do that, you will need to set the SMC router to bridge mode, you will not be able to do that by yourself because only tech from your ISP have the capability of doing that since they have this tool that can operate on the router setting it to bridgemode. Basically, you will need to call your ISP to set the router to bridgemode and from there, you will be able to configure the linksys router.
Hope this information will help.

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I'm unsure of the exact part number here but using the model number I checked the manual. This looks like it's just an access point which extends a current network you have. If you only have your laptop, this device and your internet modem it may not give you the wireless connectivity you're looking for. On a normal setup you would plug your modem into a router, plug your laptop into the router and set it up with all your DSL/Cable connection information as well as wireless on/off. You can then unplug from the router and continue life. with this one it's only connecting to an existing setup (another router or another wireless network) and extending it.
If you are looking for a solution to give you a router that connects to your modem and gives you wireless or adding multiple devices on a single connection I would recommend returning this and getting an all-in-one router such as this: http://homestore.cisco.com/en-us/Routers/Linksys-E1000-Wirelessn-router_stcVVproductId97826160VVcatId551966VVviewprod.htm?icid=linksys-specs-e1000-learnmore-btn&src2=linksys-specs-e1000-learnmore-btn

use the wrt310n router as the router for the internet (where dsl modem is connected) then just connect the ethernet port (not wan port or internet port) of the SMC to the ethernet port of wrt310n

Make sure you are plugging the SMC into the WAN port on the Linksys router and not the LAN ports.  Your internet connection (which is your SMC) should always plug into your WAN port on the Linksys.  Any computers that you may need to plug in, like Desktops that are "wired" and not "wireless", should plug into the LAN ports on the Linksys.  If you are not using the WAN port on the Linksys for your SMC modem, then that would explain why you cannot get to the internet on wireless or wired computers.
Here's why you are getting the "low connectivity" message:

Computers don't understand why the Internet is connecting or not connecting...so the "low connectivity" message you keep receiving has nothing to do with your wireless signal strength.   To a computer NIC, "low connectivity" means your network adapter could not find a DHCP server and receive a valid IP address.  When this happens, your network adapter assigns an IP address to your computer in the following range...169.254.0.0, and will display the "low connectivity" message until it is able to receive a valid private IP address from the DHCP server.  You can verify this by going to START | RUN and typing "cmd" (without the quotes), then hit ENTER.  A black box will pop up....then type "ipconfig" (without the quotes) and hit ENTER.  This will show you your IP address, subnet mask, and gateway address, and you can verify that your IP address is in the 169.254.0.0 range.  A valid private IP address is typically in the 192.168.0.0 range, but could also be in the 10.0.0.0 range, or the 172.16.31.0 range.    Also, make sure you have DHCP server enabled on the Linksys router for the LAN.  This will ensure your "wired" and "wireless" computers receive a valid IP address.  
The WAN port on your Linksys router should be configured to "Obtain an IP address automatically using DHCP".

Cheers!

Can you still connect to the Internet with the Linksys router? I suggest that you go ahead and reset the SMC router to clear up your previously configured settings. Then before reconnecting it to the linksys router, make sure that you can access its web interface via 192.168.1.1. Don't disable DHCP as your computer won't be able to obtain an IP address from it automatically. Do not change other settings. Next, disconnect the ethernet cable and check if you can access the router interface wirelessly. Once done, connect SMC's WAN port to Linksys' numbered port. Make sure SMC's WAN light is on, as well as the light for the port you used on the Linksys router. Check if you can get online.

With this configuration, the linksys router is now acting like a modem, and the SMC as your router. As long as you're online when wired to the linksys, you should also be able to access the net on the SMC once you physically connect them.

It shows that your wireless router and wireless adapters are both working. One thing to try is changing your wireless channel. Since you are already using 11, try maybe 1 or 9. Check if your SMC adapter will pick up the wireless signal.

By the way, how far is your computer (using the SMC adapter) to your wireless router?

ok you do the reconfigure the linksys routerand give the wireless enable in the both smc and the linksys also .

It's the particular type of security you've got set up. Some formats of security require the key to be between a minimum and maximum number of characters, some require it to be a set number of characters. If you have problems, reset the router using the reset button on the back, and run the setup again.

Are you trying to set up router ?
You can set up your router manually, without the CD.
Make sure that your computer is able to go online directly through the modem.
If your computer is able to go online through the modem, that means the modem is working fine.
You will need to connect the computer to the router and the modem to the router.
open the set up page of the router and change the settings of the router according to the ISP.

Looks like your device does not support playing router for cable internet. Would recommend you get an actual router, or alternately if you have a computer with two network adaptors you could plug one into cable modem, plug other in to LAN side of router, then configure turn Windows Internet Connection service, will need to disable the DHCP service on the router. I highly recommend you get a real cable/dsl router to do this tho. Linksys 54g series has been one of my favorites. Router homepage on SMC site. http://www.smc.com/index.cfm?event=viewProduct&localeCode=EN%5FUSA&cid=1&scid=4&pid=1588