TELECOMMUNICATION APPARATUS FOR TRANSMISSION OF SIGNALS OVER COPPER WIRE INFRASTRUCTURE; TELECOMMUNICATION SWITCH FOR SWITCHING SIGNALS OVER COPPER WIRE INFRASTRUCTURE; TELECOMMUNICATION APPARATUS FOR TRANSMISSION OF SIGNALS OVER OPTICAL FIBER INFRASTRUCTURE; TELECOMMUNICATION SWITCH FOR SWITCHING SIGNALS OVER OPTICAL FIBER INFRASTRUCTURE; APPARATUS FOR CONVEYING TELECOMMUNICATION SIGNALS FROM A COMMON SOURCE TO A PLURALITY OF DESTINATIONS
Electrical and Scientific Apparatus