Your SB5120 is not a wireless device. I think that you are confusing the cable modem with the wireless router. New modems may have a wireless feature.
I assume that your modem is hooked up to a router that has a wireless feature and you are trying to set up or re-set the WEP encryption key.
Try searching for a manual under the router name.
You can always bring the router back to its original default state by pushing the re-set button, located on the back of the device. It is usually a small hole about the size of a paper clip near the on-off button. While the router is powered on, push the point of a pen into the hole for about 10 second. Then you can go through the router menu and reset all the passwords, WEP keys and other parameters.
If you need help on how to access or set up the router menu, please comment. Also let me know if this information helped you.
J
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