6
PABX
private automatic branch exchange
7
PAC
paraxial/axial color
8
PACS
picture archiving communications system
9
PAL
phase alternation line
10
PAM
pulse amplitude modulation
11
PAMA
pulse address multiple access
12
PAS
photoacoustic spectroscopy
13
PAT
pointing, acquisition and tracking
15
PBC
polarization beam combiner
16
PBX
private branch exchange
17
PC
photoconductive; printed circuit; personal computer
18
PCAOM
polychromatic acousto-optic modulator
19
PCD
plasma-coupled device
20
PCE
phase-change erasable
21
PCF
photonic crystal fiber
22
PCI
peripheral component interconnect
23
PCM
pulse code modulation; phase-conjugate mirror
24
PCMI
photochromic microimage
25
PCP
plastic-clad plastic
26
PCR
photoconductive relay; polymerase chain reaction
27
PCS
plastic-clad silica
28
PCT
photon-coupled transistor
29
PCVD
plasma chemical vapor deposition
31
PDA
photodiode array; postdeflection acceleration
32
PDCR
polarization-dependent coupling ratio
33
PDG
polarization-dependent gain
35
PDK
phase-delay keying
36
PDL
polarization-dependent loss
38
PDLC
polymer dispersed liquid crystals
39
PDM
pulse duration modulation
40
PDP
parallel detection polychromator