"Where did the 4 pair "standard" come from? Remember, there was 4 pair in the CAT zero days. I think you will find the answer if you look at the Bell System/AT&T 568B standard that was probably written for the old Merlin systems. That was the first use of a 4 pair cable."
Actually, it was about a decade before the Merlin systems came out. 568B evolved from WECO's propriety wiring designed for their MET sets that were used on their Dimension PBXs. Later uses came into play on Horizon systems and even for fifth line conversions on ComKey 416 systems. Yes, Western Electric invented it for sure, but someone else managed to get the credit.
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