TELNET is the traditional protocol for making remote console connections over TCP.
TELNET is not secured and is mainly used to connect to legacy equipment now days.
Follow these instructions to configure an Arch Linux machine as a telnet server.
To only use telnet to connect to other machines, install netkit-telnet:
pacman -S netkit-telnet
To also configure a telnet server install xinetd as well:
pacman -S xinetd netkit-telnet
- Important, "Telnetd is evil legacy code and is not trustworthy - do not run it unless you absolutely need it." a quote from the netkit-telnet readme.
A better option when needing a telnet server, is to install telnet-bsd from AUR instead of netkit-telnet (which also has support for IPv6).