PBX - Abbreviation for private branch exchange.;
PC - Abbreviation for Physical Contact adaptor. In fiber optics, the physical contact refers to connectors which provide back reflections (also referred to as return loss) of less than 30 db. D4 adaptors allow the fibers to be butted together, resulting in a constant index of refraction in the optical transmission path, thereby eliminating most of the reflection. In non-PC adaptors, the fiber cores are brought into close proximity to each other with a small air gap (usually only a few microns) between them.
PCP - A commonly used term for air core (unfilled) direct burial cable with a corrugated copper shield.
PCTFE - Abbreviation for polychlorotrifluorethylene. One of the fluoropolymers which has a high dielectric strength used at temperatures to 250° C.
PE - Abbreviation for polyethylene. A thermoplastic insulation having excellent electrical properties. Also abbreviated as poly and pol.
PE FC - Abbreviation for polyethylene flooding compound.
PE Foam - Abbreviation for polyethylene foam. Also abbreviated as PEF.
PE-III - Abbreviation for clear polyethylene.
PE-IIIA - Abbreviation for high molecular weight, black polyethylene, type IIIA, per MIL-C-17.
PEAK VOLTAGE - The maximum voltage reached during an alternation of frequency.
PEF - Abbreviation for polyethylene foam. Also abbreviated as PE Foam.
PERCENT CONDUCTIVITY - Conductivity of a material expressed as a percentage of that of copper.
