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EXFO Glossary

P (browse from .......... to)
P2MP...............PCRPCS...............PINPING...............Polarization Multiplexing (Pol-Mux)Polarization-Maintaining Fiber (PMF)...............Private Branch Exchange (PBX)Propagation Delay...............PVC
P2MPParallel DetectionPBT
PABXPassive Optical Local Area Network (PO-LAN or POL)PC
PacketPassive Optical Network (PON)PCC
Packet Internet or Inter-Network Groper (PING)PATPCI
Packet JitterPause FramesPCR
Packet-Switched NetworkPBB-TE
from P2MP... to PCR


Acronym for: Point-to-point


Acronym for: Private automatic branch exchange


Bits grouped serially in a defined format, containing a command or data message sent over a network. Same as a frame.

Packet Internet or Inter-Network Groper (PING)

A basic Internet program that verifies if a particular IP address exists and that it can accept requests. Using the word “ping” as a verb means the act of using the PING utility or command. As a diagnostic utility, PING is used to ensure that a host computer you are trying to reach is actually operating.

Packet Jitter

Variation defined for a selected pair of packets within the continuous stream of packets going from measurement point 1 (MP1) to measurement point 2 (MP2). The IPDV is the difference between the one-way delay of the selected packets. Also known as IP packet delay variation (IPDV).

Packet-Switched Network

A network that allows a message to be broken into small packets of data that are sent separately from a source to a destination. Packets may travel different paths and arrive at different times, with the destination sites reassembling them into the original message. Packet-switching is used in most computer networks because it allows a very large amount of information to be transmitted through a limited bandwidth.

Parallel Detection

An auto-negotiation device's means to establish links with non-negotiation, fixed-speed devices.


Acronym for: Parameter

Passive Optical Local Area Network (PO-LAN or POL)

Networks using PON technology to large entreprises to offer more bandwidth and make it more secure.

Passive Optical Network (PON)

Network in which fiber-optic cabling (instead of copper) brings signals all or most of the way to the end user. It is described as passive because no active equipment (electrically powered) is required between the central office (or hub) and the customer premises. Depending on where the PON terminates, the system can be described as an FTTx network, which typically allows a point-to-point or point-to-multipoint connection from the central office to the subscriber’s premises; in a point-to-multipoint architecture, a number of subscribers (for example, up to 32) can be connected to just one of the various feeder fibers located in a fiber distribution hub, dramatically reducing network installation, management and maintenance costs.


Acronym for: Program associate table

Pause Frames

An optional flow-control technique for full-duplex Ethernet networks. One end station may temporarily stop all traffic from the other end station by sending a pause frame.


Acronym for: Provider Backbone Bridge-Traffic Engineering (also referred to as PBB-TE)


Acronym for: Polished connector


Acronym for: Protection communication channel


Acronym for: Peripheral component interconnect (personal computer bus)


Acronym for:

1. Peak cell rate

2. Program clock reference