multiplexer, hardened multiplexer, t1 multiplexer, fiber optic multiplexer, utility communications, powerline carrier, power line carrier, 2mb, 2.048 mb, e1 multiplexer, teleprotection, prism, nortel, multiplexor, t1, e1, channel bank, focus, tc10b, tcf10b, pilot protection, fiber optic communication, plc, protective relay communication, mirrored bit, rfl, licom, prisim, transmission line relaying, hcb, pilot relaying, transmission line protection

design and manufacture of specialized communications products for electric utility, telephone and industrial applications using fiber optic and power-line carrier technologies