Cable Modem CM1000

> Model: CM1000|Ultra-High Speed Cable Modem-DOCSIS. 3.1 Ready

   Is that accurate?  Not a CM1000v2? Look at the product label.

> I need to know if I have to connect this modem to a computer in order
> for it to work or can I just plug it into the cable and the wall?

   _Why_ do you "need to know" that?  It might help if you explained
exactly what the problem is which you are trying to solve.

   A new (or freshly reset) cable modem _might_ work when first
connected to the ISP cable (and power), but if anything goes wrong, or
it needs some help (with activation, for example), then you'll need a
way to communicate with it, and, as the User Manual recommends
(demands?), a computer with an Ethernet connection is the
simple/reliable way to do it.  You can try it without one, and hope to
get lucky.

   Visit http://netgear.com/support , put in your (actual) model number,
and look for Documentation.  Get the User Manual.  Read.  Look for
"Install and Activate Your Cable Modem".