As this is one of their business grade routers I would hope the configuration options would be plentiful - they should be given the price!
There is a User's Guide on
Zyxel's support site so hopefully that will have the info you need.
I can't find reference anywhere to which chipset it uses though. All of the domestic Zyxel kit that I have encountered does use Broadcom based modems, but that is not a guarantee as other manufacturers use a mix of vendors so I wouldn't be surprised if Zyxel does too.
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