Bill, I know what you mean. T-Screen cable is rarely seen these days, yet it made sense for analog T1 circuits. These days, T1's are just emulated using digital circuits. I agree that on analog T1's, all of the transmit pairs should be in one compartment of the cable and the receive in the other for long-haul 4-wire circuits.
But when we have the technology to place both services over one pair, what happens? Is it a transmit or receive pair? Therein lies the question. The proverbial chicken or the egg thing for sure.
