This is a diagram of how the Champaign schools are going to
use ISDN lines to connect schools to a central location. Each
school needs an ISDN line connecting it to the phone company.
From the phone company, a Primary ISDN line connects to the
central office so that all of the schools can connect at the same
time to the file server and the Internet. This diagram shows a
radio link to the Internet, but a T1 line, Fibre, or several
Primary ISDN lines could be used.
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