blocking switch in a sentence

1. These are commonly referred to as " blocking switches " and are the most common in modern telephone exchanges.
2. This represents a significant simplification of a demux and switch and multiplex architecture that would require ( in addition to N + 1 mux / demux elements ) a non-blocking switch for 88 N x N channels which would test severely the manufacturability limits of large-scale optical cross-connects for even moderate fiber counts.
3. It's difficult to find blocking switch in a sentence.