The series equipment is the company developed the PCM optical fiber transmission for the large scale integrated circuit on base of the developed of optical fiber transmission Provide 60 channals call,4 way 10/100M fast Ethernet(line 100M),1 expansion interface(RS232/RS485/RS422 asynchronous data?switch signal) Ethernet interface can exchange for each other , The working is reliable, stable, and low power consumption, high integration, small size, easy of installation and maintenance.