I forgot a step on the DIR-655. Click on the Manual Wireless Network Setup button on the WIRELESS SETTINGS page. Then list what you have for 802.11 Mode, Enable Auto Channel Scan, Wireless Channel, Transmission Rate, Channel Width, Visibility Status, and Security Mode.
For the 920 signal strength click on the Site Survey button on the Wireless Setup page. That will tell you how strong of a connection you have to the router.