Acronym for packet assembler/disassembler.

1. In cryptography, a bit or a string of bits appended to a message either for filtering purposes or to cause the message to contain an even multiple of the number of bits required by the cryptographic algorithm. [After X9.23]
2. One or more bits appended to a message in order to cause the message to contain the required number… (Read More →)

The use of special techniques to protect data or software against unauthorized copying. [2382-pt.8]

A small radio receiver designed to be carried by a person and to give an aural, visual, or tactile indication when activated by the reception of a radio signal containing its specific code. It may also reproduce sounds and/or display messages that were also transmitted. Some pagers also transmit a radio signal acknowledging that a message has been received. [47CFR]… (Read More →)

A one-way communications service from a base station to mobile or fixed receivers that provide signaling or information transfer by such means as tone, tone-voice, tactile, optical readout, etc. [47CFR]

See PARS.

See pager.

A transmission system that uses concentrators or multiplexers so that fewer wire pairs may be used than would otherwise be required to provide service to a given number of subscribers.

A cable made up of one or more separately insulated twisted-wire pairs, none of which is arranged with another to form quads.

A code in which some or all of the characters are represented by two sets of digits of opposite disparity that are used in sequence so as to minimize the total disparity of a longer sequence of digits.
Note 1: An alternate mark inversion signal is an implementation of a paired disparity code.
Note 2: The digits may be represented… (Read More →)