Glossary
| Term | Main definition |
|---|---|
| Patching |
A means of connecting circuits via cords and connectors
that can be easily disconnected and reconnected at
another point. May be accomplished by using modular
patch cords connected between jack fields or by patch
cord assemblies that plug onto connecting blocks.
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| Pathway |
A facility (e.g., conduit, cable tray, raceway, ducting, or
plenum) for the placement and protection of telecommunications
cables.
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| PBX Private branch exchange | A telephone switching system servicing a single customer, usually located on that customer
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| PCB | Printed Circuit Board
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| PCM Pulse code modulation | The most common method of converting an analog signal, such as speech, to a digital signal by sampling at a regular rate and converting each sample to an equivalent digital code. The digital data is transmitted sequentially and returned to analog format after it is received.
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| PCS Plastic-clad silica fiber | A step-index multimode fiber that has a silica core and is surrounded by a lower index plastic cladding.
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| PE Polyethylene | A thermoplastic material with excellent electrical properties. PE is used as an insulating material and as jacket material where flame-resistance requirements allow.
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| Peak |
The maximum instantaneous value of a varying current
or voltage.
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| Peak wavelength |
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| Pedestal |
A device, usually mounted on the floor or ground, which
is used to house voice/data jacks or power outlets at the
point of use. Also commonly referred to as a monument,
tombstone, above-floor fitting, or doghouse.
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| Periodicity |
Uniformly spaced variations in the insulation diameter
of a transmission cable that result in reflections of a
signal.
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| Phase |
An angular relationship between waves or the position
of a wave in its oscillation cycle.
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| Phase shift |
A change in the phase relationship between two alternating
quantities.
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| Photo-bleaching |
A reduction in added loss that occurs when a fiber is
exposed to light. Ionizing radiation causes added loss.
This loss can be reduced by transmitting light through
the fiber during normal operation or by exposing the
fiber to sunlight.
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| Photodetector |
An optoelectronic transducer, such as a pin photodiode
or avalanche photodiode, that acts as a light detector.
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