For what it's worth, I clicked some links on the posted page and the first datasheet I opened was for a 10base-T1 transceiver. So I believe this "single pair et

For what it's worth, I clicked some links on the posted page and the first datasheet I opened was for a 10base-T1 transceiver. So I believe this "single pair ethernet" encompasses both T1 and T1L, with L probably standing for "long distance". It's confusing but it is nice to have a family of standards that hopefully work the same, but have different physical layer for different use cases.