3A COMMTEK CO., LTD.development, design,manufacture and sale the RS-232,RS-485,RS-422,RS-449,V.35,X.21,Current loop, LAN ssmartinterface converter,protable handhold protocol analyzer,data scope,LAN cable tester, breakout box,smart,compact,isolation product series. the most popular products are DS-500, DS-300,485-I,ISO-485,485-SMART,CL-I, CL-II,LAN cable tester CT4511, BOB-220 etc.
