Excuse me Bill,
Back in Bell Labs day, that’s the way things were. There may (or may not) be mechanical reasons why the connectors work better, but Impedance matching in this case is not an issue.
The thumb rule for impedances is, low to high is OK. High to low is a NO.
Visually, you can flow a low impedance circuit (think 6″ pipe) into a high impedance (garden hose) and get a nice flow. If you go high (garden hose) into low (6″ pipe) it just doesn’t work.
Regards,
Ty Ford
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