The world's public switched telephone networks, both wireline and mobile, communicate with each other by means of a signaling protocol known as __________________.
A. private branch exchange (PBX)
B. Signaling System 7
C. public switched telephone network (PSTN)
D. public data network (PDN)
Question 2
A ______________ terminated in an open has a reflected voltage wave that is always of the same polarity and amplitude as the incident voltage wave.
A. transmission line
B. magnetic field
C. wavelength
D. circuit
