Thicknet Connectors
Although a thicknet network also uses coaxial cabling, the connectors can be quite different.
Thicknet cable can be attached directly to computers using larger BNC-style connectors that are similar to thinnet connectors, however, thicknet is usually connected indirectly.
In this indirect method, a vampire tap pierces the thicknet cable and attaches to a transceiver that is external to the NIC.
A drop cable, no more that 50 feet long, connects the transceiver to an AUI port on the NIC.
Unlike a BNC attachment or an RJ-45 attachment, the AUI attachment on the NIC is not a transceiver.