Terminal server
A terminal server is a communications processor that connects one or more asynchronous devices such as terminals, printers, hosts, and modems to an Ethernet LAN or WAN that uses TCP/IP, X25,or LAT protocols. Get more info on terminal servers on blackbox.co.uk.
SERIAL TERMINAL SERVERS, SERIAL CONSOLE SERVERS

Serial Terminal Servers
Use an Economic Terminal Server to connect your PCs, ASCII terminals, printers, modems and hosts to an Ethernet LAN while simplifying your wiring scheme.
TERMINAL SERVERS
terminal server
Serial console server, serial terminal server...