The household is wired for cable, e.g. receives cable via a wire to the home from a cable headend located in the community.  If a home is “wired” to receive cable channels on any TV set in the home, then the home is considered a “wired” cable home.

Source:
http://www.nielsenmedia.com/glossary/
http://www.arbitron.com/downloads/terms_brochure.pdf