A fax board is a computer board that is inserted into a fax server or multifunction copier/printer/scanner (MFP) to add fax capabilities (once it plugs into a landline phone line).
With an MFP, a fax board is often called a “fax kit.” The term “fax kit” is not typically used for server boards, however.
MFP fax boards
Most MFPs have copy, print, and scan as options. With fax enabled, faxes can be sent through the document feeder and received automatically as well.
With many MFPs, options such as forwarding fax to email or receiving faxes to a specific paper tray can happen.
Server fax boards
A server fax board usually comes with an analog phone port to connect to a fax line.
This fax board allows for the server to communicate with the phone network.
Sources and more resources
Fax Authority – How to use a fax machine, how to use fax software, and how to use a fax server – our guides to setting up and using fax machines and fax servers.