Glossary
Term | Main definition |
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PSAFEXT Power-sum alien far-end crosstalk | The power-sum measurement of alien crosstalk in the far end (away from the transmitter); the result from this test is used with the attenuation to calculate power-sum alien attenuation-to-crosstalk ratio (far end) (PSAACRF), a requirement of ANSI/TIA-568-C.2 for Category 6A cables.
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PSANEXT Power-sum alien near-end crosstalk | The power-sum measurement of alien crosstalk in the near end (at the transmitter); a newly established requirement in ANSI/TIA-568-C.2 for Category 6A cables.
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PSTN Master | FULL Master - For a direct line from the telephone company and not via the office telephone exchange, PABX.
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PSTN Public switched telephone network | The basic phone service provided by the phone company. See also plain old telephone service.
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Public data network |
A network established and operated for the specific
purpose of providing data transmission services to the
public. See also public switched network.
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Public switched network |
A network provided by a common carrier that provides
circuit switching between public users, such as the public
telephone network, telex, Sprint
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Puck |
In fiber optics, metal disc that holds a connector in the
proper position against an abrasive for polishing the
connector endface.
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Pull strength |
The pulling force that can be applied to a cable without
damaging a cable or affecting the specified characteristics
of the cable. Also called pull tension.
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Pull string |
A string that is tied to a cable and is used to pull cables
through conduits or over racks. Similar to fish tape.
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Pulse |
A current or voltage that changes abruptly from one
value to another and back to the original value in a finite
length of time.
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Pulse dispersion |
The dispersion of pulses as they travel along an optical
fiber.
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Pulse spreading |
The dispersion of an optical signal with time as it propagates
through an optical fiber.
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Punch-down |
A generic name for any cross-connect block where the
individual wires in UTP are placed into a terminal groove
and
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PUR Polyurethane | A broad class of polymers that are noted for good abrasion and solvent resistance. Not as common as PVC (polyvinyl chloride).
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PVC Permanent virtual circuit | Technology used by frame relay (as well as other technologies like X.25 and ATM) that allows virtual data circuits to be set up between the sender and receiver over a packet-switched network.
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