1000th

Abbreviation of thousandth.

100BaseTX

IEEE physical layer network specification for 100 Mbps over two pairs of Category 5 UTP or STP wire.

100th

Abbreviation of hundredth.

10BaseT

IEEE 802.3 Ethernet LAN specification, using unshielded twisted pair wiring running at 10Mbps.

10th

Which comes after the ninth.

1st

Having no predecessor. The ordinal number corresponding to one.