dalawang klase ang hub.. yung ordinary hub (lumang hub) and the newer hub switch. pag ordinary hub lang yan, automatic hati yung speed mo. so kung example 256 yung speed ng connection mo and dalwang computer ang gumagamit, 128 lang ang max na makuha ang bawat pc. while pag hub switch yan, each pc can go up to 256, ang switch na bahala mag allocate ng speed sa both pc
also, its not true that DSL routers with 4 port switches are more expensive than a plain DSL router and a switch. mura na ang mga DSL router ngayon. and most DSL routers these days already have a standard 4 port switch. yan na ang norm ngayon. example, a netgear 54 wireless g router with 4 port switch as well as firewall security will only cost around 3000 (kung plain router w/ 4 port switch lang ang murang klase like edimax is only around 2000)
i think the thread starter has already made it clear that his DSL router comes with 4 ports. also, with regards to using multiple pc's, there is no problem there, you can set it up with the use of a DSL router (though it may mean that you have to provide the DSL router yourself) unless there is an explicit notification from your ISP that you cannot use more than 1 pc
if we are talking about the standard routers that ISP's give, mostly these are not the standard routers being sold commercially these days. these are just the old type DSL router that doesnt provide a login, no added security, no firewall, no port forwarding, etc.
why? since lugi sila pag yun ang iprovide nila. their concept kasi is like this, their so called speed daw is designed for one user lang. if you want to use two or more computers, dapat daw dun ka sa higher na plan (i.e. bigger earnings for them) kasi daw pag dalawa ang gamitin mong pc, hati daw yung speed mo (which is partially true but not neccesarily all the time if you are using a switch)