Computers are connected to the network via 5ESS
jacks, the same kind used to connect the ISDN (digital) phones.
If you look at a jack, you will see that it has two ports (places
to plug in a wire). You need an open port on a 5ESS jack to have
a connection to MITnet.
Look in your area for jacks with empty ports to which you can
connect your computer(s). If you find a jack that will do, write
down the number written on the jack housing.