Way back in the beginning of Structured cabling systems AT&T came out with a 21 pair cable which included 7 groups of 3 pair, each group was wrapped with mylar and then the 7 3-pair groups were formed under the cable sheath. It was meant to terminate on a row of a 110 block using 110C-3 clips. The wiring system didn't last long as far as the market goes, eventually replaced with 4 pair cat 3.
Note to Sam - This was for Thompson McKinon down on the wharf, Forest installed it about 1986 or 87
I'm a black & white type of guy.....the only grey in my life is the hair on my head!
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