Can I use CM1150V as just a router?

> [...] Can I switch off telephone and modem functions in the CM1150V
> and use it justas a router? [...]

   No.  A model CMxxxx is a modem only.  If it had any router functions,
then you might have a chance, but it has none.

   A model Cxxxx modem+router, for example, includes a router, but even
there, with no Ethernet WAN/Internet port, it's useless as a
general-purpose router.  (But a Cxxxx might be usable as a wireless
access point.  I doubt that a CMxxxx could do even that.)