Yep,
You have to change 2 files in the directory
/etc/e-smith/templates/etc/sysconfig/network-scripts/chat-ppp0: 25init and 30dialup, so that all AT-commands that are unsupported by your cablemodem are removed (ATL0M0 and the "T" after ATD will result in errors, probably). Now change your connection-type (this causes e-smith to rewrite the configuration files and use the templates you just altered) and make sure that the phonenumber you dial is just a "4" and reboot. As you can see in the directory mentioned, the template in 20reset provides the ATZ for initialisation.
Succes,
Fred