OEM Screentyper / network-capable ASCII terminals?

Mention of this on another group got me curious - anyone ever come across an 'OEM screentyper' before? From what I'm told it sounds very like a text-mode ASCII dumb terminal (Z80 CPU, ASCII display, diskless) - yet it has a network port on the back, rather than an RS-232 connection to some other intelligent machine. In other words, it sounds old and simple - but seems unusual if its connection to the outside world is via a direct network connection. I'm awaiting more details to see if the person who told me of it can recall if it was Ethernet or Token Ring or something else (and that it not being just RS232 via a non-standard connector can be ruled out), but I figure someone here may have heard of it anyway. I wondered if maybe it was a packet monitor or some sort of data logger rather than a data-entry device... cheers Jules