I feel that pharmacy provides the best options for me in relation to my interests in drugs, industry/research, and clinical practice. So with that, I've been thinking that perhaps it might be best to find a job as a pharmacy technician. I'm currently a patient care associate, and make $19/hr.
The Public Switched Telephone Network - The public switched telephone network (PSTN) is the international network of circuit-switched telephones. Learn more about PSTN at HowStuffWorks. x
Circuit Switching. The PSTN is what is known as a circuit switching network. In other words, when a telephone call is made, an exclusive dedicated circuit is established and only released when the call ends.hares & Saves. Save. PSTN is an abbreviation for Public Switched Telephone Network and is used to describe a network of interlinked telephone systems---state-owned or commercial---and includes everything but private telephone systems that are managed by their own PBX (Private Branch eXchange).