COMPUTER AND TELECOMMUNICATION NETWORKING PRODUCTS USING FIBER OPTICS OR COPPER LINES, NAMELY LINE MODEMS, FIBER OPTIC MODEMS, LINE CONVERTERS AND SIGNAL CONVERTERS, FIBER OPTIC CONVERTERS, LINE BOOSTERS AND SIGNAL BOOSTERS, FIBER OPTIC BOOSTERS, LINE EXTENDERS, FIBER OPTIC AMPLIFIER, BACK-UP LINE SWITCHES, LINE MULTIPLEXERS, FIBER OPTIC MULTIPLEXERS, OPTICAL TRANSCEIVERS, MULTIPLE ACCESS UNITS (MAU's), OPTICAL WAVELENGTH MULTIPLEXERS, LASER TRANSMITTERS, ANALOG LINKS, ATM TRANSMITTERS, ATM M...