Glossary
Term | Main definition |
---|---|
Preform |
A short, thick glass rod that forms the basis for an optical
fiber during the manufacturing process. The preform is
created first, and then melted and drawn under constant
tension to form the long, thin optical fiber.
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Prefusing |
Fusing the end of a fiber-optic cable with a low current to
clean the end; it precedes fusion splicing.
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Premises |
A telecommunications term for the space occupied by
a customer or an authorized/joint user in a building on
continuous or contiguous property that is not separated
by a public road or highway.
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Premises wiring system |
The entire wiring system on a user
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Prewiring |
Wiring that is installed before walls and ceilings are
enclosed. Prewiring is usually easier than waiting until
the walls are built to install wire.
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PRI Primary rate interface | As defined by the ISDN standard, consists of 23 B-channels (64Kbps each) and one 64Kpbs D-channel (delta channel) in the United States, or 30 B-channels and one D-channel in Europe.
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Primary coating |
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Project | Generic term referring to scope and requirements under a specific Project or Contractual arrangements.
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Propagation delay |
The difference in time between when a signal is transmitted
and when it is received.
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Protector |
A device that limits damaging voltages on metallic
conductors by protecting them against surges and
transients.
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Protocol |
A set of predefined, agreed-upon rules and message
formats for exchanging information among devices on a
network.
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Protocol analyzer |
A software and hardware troubleshooting tool used
to decode protocol information to try to determine the
source of a network problem and to establish baselines.
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PS Picosecond | One trillionth of a second.
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PS2 |
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PSACR Power-sum attenuation-to-crosstalk ratio | The ratio of attenuation to power-sum near-end crosstalk; while not a requirement of ANSI/TIA-568-C.2, it is figure of merit used by all manufacturers to denote the signal to power-sum noise ratio in the near end.
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