Requirements for higher transmission rate of the dial-up
lines, which was chosen to start the network, have arisen
and the use of the high-speed modems have been studied.
A new UUCP protocol and tty driver enhancement are developed
for the purpose. As the result, more than 13kbps
UUCP data transmission rate is achieved. This encouraged
us to migrate onto TCP/IP suite using dial-up lines
as well as using leased lines. Performance of the implementation
of the dial-up IP link is about 7.5kbps which
is practical enough to construct a distributed environment
over a widely interconnected network environment.
Progresses of JUNET technologies discussed in this paper
lead us to many topics of future studies such as: