See synchronizing pilot.

1. A subcarrier that serves as a control signal for use in the reception of FM stereophonic sound broadcasts. [47 CFR
7
3. 310]
2. A subcarrier used in the reception of TV stereophonic aural or other subchannel broadcasts. [47 CFR
7
3. 681]

See pilot.

1. A circuit arrangement by which trunks provided over a carrier system are made busy to the switching equipment in the event of carrier system failure, or during a fade of the radio system.
2. In COMSEC, see traffic padding.

Protocol Independent Multicast

Protocol Independent Multicast- Sparse Mode

Abbreviation for personal identification number. A code or password, unique to or associated with, a specific user, and entered into a data-processing device for purposes of verifying the identity of a person requesting, e.g., a transaction or access.

Acronym for positive-intrinsic-negative diode. A photodiode with a large, neutrally doped intrinsic region sandwiched between p-doped and n-doped semiconducting regions.
Note: A PIN diode exhibits an increase in its electrical conductivity as a function of the intensity, wavelength, and modulation rate of the incident radiation. Synonym PIN photodiode.

Synonym PIN diode.

Abbreviation for packet Internet groper. In TCP/IP, a protocol function that tests the ability of a computer to communicate with a remote computer by sending a query and receiving a confirmation response.