01- Part of TP4000 - Alarm panel + memory, CPU & line cards.
02- Network Management Centre 24/3/1980
03- Rear of TP 4000 Showing input/output sockets 24/3/1980
04 - TP4000 - Power unit + cards 24/3/1980
05 - Rear view of TP4000 during installation and testing 24/3/1980