They come in different sizes. Some of the larger ones are capable of supplying multiple hundreds of users in a use for locations such as, apartment complexes, etc.
The 32 is only used in reference to FTTP (fiber to the premises) refers to the number of splits of the fiber. This type of installation is extremely rare, the majority of the installations are FTTN.
Well if you look at the pic of the VRAD in this thread it'll give you an idea. Basically it's gonna be a multiple of 24. The one in the pic is capable of 396 ports but only has cards for 144 installed.
is it possible to know how many subscribers are on your VRAD? I'm having an intermittent problem with QOS that affects my VOIP phone. One theory is excessive number of subscribers on the node or all of the subscribers simultaneously using the internet, causing a short drop in service