Of an antenna, a directive element that is not connected to a radio transmitter or receiver either directly or via a feeder, but is coupled to the driven element only by the fields. Synonym passive element.

In a communications system in which one or more electromagnetic sources are used, electromagnetic radiation--such as lightwaves, radio waves, microwaves, X-rays, or gamma rays from one or more of the sources--that is not harmonically related, i.e., is not coherent, with the transmitted carrier.
Note: Parasitic emissions are usually caused by undesired oscillations or energy-level transitions in the sources. [From Weik… (Read More →)

In optical systems, a ray that is close to and nearly parallel with the optical axis.

1. In binary-coded data, a condition that is maintained such that, in any permissible coded expression, the total number of 1s, or 0s, is always odd or always even.
Note 1: Parity is used in error -detecting and error-correcting codes.
Note 2: For example, in the ASCII code or in the International Telegraph Alphabet 5 (ITA-5) code as usually implemented,… (Read More →)

An extra bit that can be added to a group of "0" bits and "1" bits to make the parity of the group odd or even.
Note: The parity bit is discarded when the message is received. [After X9.19]

A test that determines whether the number of ones or zeros in an array of binary digits is odd or even.
Note: Odd parity is standard for synchronous transmission and even parity for asynchronous transmission. Synonym odd-even check.

Representative of the served user who parks a call via "call park. "

Abbreviation for paging and radiotelephone service. A radio service in which common carriers are authorized to offer and provide paging and radiotelephone service to the general public. This service was formerly titled Public Land Mobile Service. [47CFR
2
2. 99]

The section of Title 47 of the Code of Federal Regulations governing (a) the direct connection of telecommunications equipment and customer premises wiring with the public switched telephone network and certain private line services, such as (1) foreign exchange lines at the customer premises end, (2) the station end of off-premises stations associated with PBX and Centrex® services, (3) trunk-to-station… (Read More →)

A condition in which outpulsing has commenced, insufficient information has been received by the customer installation (CI) to process the call and no further outpulsing has been received from the network within a timed interval. [T1.405-1989]