Main Distribution Frame Site (MDF Site)
An MDF site is a telephone exchange building that houses a main distribution frame, where customers' copper lines are terminated.
What is Main Distribution Frame Site (MDF Site)?
The MDF is the large frame on which every copper local loop in the exchange area ends and can be connected to equipment. Ofcom's market analysis and Openreach's products often refer to MDF sites as the points where unbundling and backhaul take place.