Dialing in which (a) pushbuttons or keys are used to actuate and connect audible tone oscillators to a line, (b) each button or key corresponds to a unique frequency or set of frequencies (as in dual-tone multifrequency signaling or DTMF), and (c) each pushbutton or key represents a unique digit or symbol. [After Weik '89]

Photovoltaic

1. permanent virtual circuit,
2. private virtual connection.

Personal Video Recorder

Abbreviation for picowatt. A unit of power equal to 10-12 W, i.e., -90 dBm.
Note: One picowatt is usually used as a reference level for both weighted and unweighted noise measurements. The type of measurement must be specified.

Pseudo Wire Emulation Edge to Edge

Abbreviation for pulse-width modulation, which is a deprecated synonym for pulse-duration modulation.

Abbreviation for picowatt, psophometrically weighted. See noise weighting.

Abbreviation for picowatts, psophometrically weighted, measured at a zero-dBm transmission level point. See dBm(psoph), psophometer.

Abbreviation for peak envelope power (of a radio transmitter).