Where did the 4 pair "standard" come from? 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.
568B is WECO! There can be no other explanation. The Merlin was introduced in 1983. Executone had a Triad K410 4-pair system at about the same time, but it used the USOC wiring code and as we know, USOC was not adopted for data use.
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