Dedicated manual link characteristics
A manual link must only be used with a
serial line that is always up and dedicated to (that is,
reserved exclusively for) a single connection.
Examples of such lines include a leased line between buildings or a serial
cable connecting two machines.
The remote host must also configure its end of the connection as
a dedicated link. Either host may initiate a connection to the other.
See ``Adding a SLIP link'' for more details.