electrical and electronic apparatus and instruments for telecommunication of data, pictures, voice and sound, namely, ISDN networks, ISDN lines, and ISDN interfaces; transmission and routing components for wired and wireless connections, namely, modems, converters, adapters, multiplexers; private access branch exchanges (PABX); ISDN terminal equipment, namely, telephones, and picture telephones; video conferencing systems comprising facsimiles, personal computers, PC interfaces, and microcomp...