primary reference source

Primary Reference Time Clock

Abbreviation for permanent signal.

public safety answering point

Power Spectral Density

A 10-digit number used for the purpose of routing 911 calls to the appropriate Public Safety Answering Point (PSAP). PANIs include but are not limited to: ESRD, ESRK, and ESQK numbers. If a NANP TN is used as a pANI, this number cannot be assigned to a customer. See "Administrative Numbers" definition.

See PBER.

Noise that satisfies one or more of the standard tests for statistical randomness.
Note 1: Although it seems to lack any definite pattern, pseudorandom noise contains a sequence of pulses that repeat themselves, albeit after a long time or a long sequence of pulses.
Note 2: For example, in spread-spectrum systems, modulated carrier transmissions appear as pseudorandom noise to a… (Read More →)

1. A device that produces a stream of unpredictable, unbiased, and usually independent bits.
2. In cryptosystems, a random bit generator used for key generation or to start all the crypto-equipment at the same point in the key stream.

1. An ordered set of numbers that has been determined by some defined arithmetic process but is effectively a random number sequence for the purpose for which it is required.
2. A sequence of numbers that satisfies one or more of the standard tests for statistical randomness.
Note: Although a pseudorandom number sequence appears to lack any definite pattern, it… (Read More →)