In it's simplest form, you will need:

PC      Bridge            Dedicated            Bridge     PC
net------or------CSU/DSU----phone----CSU/DSU-----or------net
work    Router              line               Router   work

A 2Meg pipe is an awful lot of bandwidth for 19 stations.
What will you be sending through the leased line that needs
that much bandwidth?

Also, since you have a STUDENT email address...  I have to ask.
Are we doing your homework assignment?

Jim Meagher
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Micro Solutions Consulting    Member of the HTML Writers Guild & the
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> -----Original Message-----
> From: PCBUILD - PC Hardware discussion List
> [mailto:[log in to unmask]]On Behalf Of Qian Jun
>
> I need advise on network.
>
> the problem: