TeleCom Glossary

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Glossary: P
P/AR Peak-to-Average Ratio
Packet assembler/disassembler (PAD) A device that accepts characters from a terminal or host computer. It then puts the characters into packets that a packet switching network can handle. It also accepts packets from the network then disassembles them into character streams that the terminal or host can handle.
Packet Switched Public Data Network (PSPDN) Packet oriented public network usually based on X.25.
Parity check A process for detecting data bits that changed during transmission.
Path End-to-end transport of a service usually consisting of multiple lines and sections. (SONET)
PCM See Pulse Code Modulation. Also an acronym for Partition Control Master (number)
PCO Plant Control Office
PDS Program Documentation Standard
PDU Protocol Data Units
Percent error-free seconds The percentage of elapsed test seconds that do not contain errors.
Performance monitoring The collection of data on either a part-time or full-time basis so that the overall efficiency of a circuit may be determined.
Permanent virtual circuit (PVC) A virtual circuit set up by the provider that establishes a dedicated point-to-point connection between two users.
PFA Private Facility Access
PGTC PairGain Test Controller
PH Phase Hit
PHTh Phase Hit Threshold
PIC Port Interface Card
PID Process Identification or Private (or Password) Identifier
Plain old telephone service (POTS) Voice-grade telephone service.
PLAR Private Line Automatic Ringdown
PLNK Point Link
PMC Phantom Maintenance Connector
PMNIU Performance Monitoring Network Interface Unit
PNNI Private NNI
Point of presence (POP) The physical access location within a LATA of a long-distance and/or inter-LATA common carrier. The point to which the local telephone company terminates subscriber's circuits for long-distance dial-up or leased-line communications.
Point-to-point A circuit that interconnects two points directly where there are generally no intermediate processing nodes computers or branched circuits although there could be switching facilities; a type of connection such as a phone-line circuit that links two and only two logical entities.
POSIX Portable Operating System Interface (IEEE)
PPP Point-to-Point Protocol
PPS Pulse Per Second
PPSN Public Packet Switched Network
PQI Performance Quality Index
PRBS Pseudorandom Bit Stream or Binary Sequence
PRI Primary Rate Interface
Private line A customer leased circuit not interconnected with the public switched telephone network for the customer's exclusive use. The private line provides transmission of voice teletypewriter data television etc.
Program circuit A voice-frequency circuit which has been equalized to handle a wider range of frequencies than what ordinary speech signals require.
Protocol Vital Signs® (PVS®) A systematic method of analysis and display of protocol operational parameters to aid in determining the cause of performance degradation.
PSD Power Spectral Density
PSDS See Public Switched Digital Service.
PSTN See Public Switched Telephone Network.
PSU Power Supply Unit
PTSU Protection Transmission Switching Unit
PTT Post Telephone and Telegraph Network
Public switched digital service (PSDS) A service that provides alternate voice and data on a 2-wire user loop.
Public switched telephone network (PSTN) A direct distance dialing telephone network that is available for public use. The network is an integrated system of transmission and switching facilities signaling processors and associated operations support systems that is shared by customers.
Pulse code modulation (PCM) The process that samples quantizes and codes the modulating analog signal into digital bit stream.
PVP Permanent Virtual Path
 

 

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