Cat 1 was the old JKT, 4 conductor (unpaired) station cable, known as "Quad". Four individual conductors, Green Red, Black and Yellow.
Cat 2 was like Cat 3 - Paired telephone cable, but with an almost negligible twist to the wires. When you opened the jacket the pairs practically fell apart into individual conductors. We used to instruct the young'uns to rip open the jacket and before removing it, tape the end of the cable. Then they would remove the jacket . Otherwise it might be too difficult to identify the actual pairs, especially in a high count cable.
Sam
