Welcome to AT Network fFrum.
Unfortunately the 1701HG Gateway is a combo Modem/Router.
Since in this type of units the Modem part is Hard Wired to the Routing part, it cannot be used as a standalone Router.
Cable Modem and DSL Modems are not the same and there is No way to connect the Cable Modem to this unit.
It means that you need to buy a regular Wireless Cable/DSL Router.
P.S. It is not a big lose the 1701HG goes on eBay for $10.
