Intermediate distribution frame (IDF): In a central office or customer premises, a frame that (a) cross-connects the usercable media to individual user line circuits and (b) may serve as a distribution point for multipair cables from the main distribution frame (MDF) or combined distribution frame (CDF) to individual cables connected to equipment in areas remote from these frames.
... 8.3% have a female householder with no husband present, and 13.1% are non-families. 11.0% of all households are made up of individuals and 6.9% have someone living alone ...