What is the difference between SSCNET and SSCNET III?

UK Product Manager, Dave Ramsay answers:
“SSCNET is the network used by the MR-J2S (or MR-J2-Super) range of amplfiers and is based on copper wire connection.  SSCNET III is used by the MR-J3-B series amplifiers and uses noise immune fibre-optic cables for communication.