As a bit of background, around 2002 there were some articles predicting the success of then newly announced 1000BASE-TX (TIA‐854), as inevitably enjoying much more commercial success than 1000BASE-T (IEEE 802.3ab). These predictions were partly based on betting that history was going to repeat itself, since 100BASE-T4 didn't see much adoption relative to the much more successful 100BASE-TX. The former used four Cat3 twisted pairs, whereas the latter used only two pairs of a Cat5 cable, thus reducing the number of transmitter and receivers needed. (The latter also supported full duplex so it had another advantage/bonus.)
But today hardly anyone remembers 1000BASE-TX, which still used all four pairs, but only uses a given wire unidirectionally, so theoretically cuts in half the number of transmitters and receivers relative to 1000BASE-T. (Full duplex operation remains the same as far the user is concerned, unlike in the 100BASE-T4 vs 100BASE-TX case.) 1000BASE-TX requires Cat 6 cable though, whereas 1000BASE-T needed Cat5e.
I can't find any evidence of actual products that supported 1000BASE-TX, though. So, did any such commercial products even exist or was this 1000BASE-TX entirely a "paper launch"? According to this page some products existed, but no concrete example is given. Which companies backed 1000BASE-TX back then? And what did they release in marketplace?