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Terms - P

  • Packet

    Transmitted files and messages are divided into smaller parts packets especially in case of bulky volumes. The packet expresses a form and label for the part of the message sent on the network layer level and higher.

  • PBX – Private Branch Exchange

     

  • Ping Packet Internet or Inter-Network Groper

    A small basic program for finding out whether an Internet address so called IP address exists and is functioning or not.

  • POP3

    The third and current version of the POP protocol developed in 1988. It enables the client computer to read mail from the mail server (POP3) through a temporary connection usually through the TCP/IP protocol.

  • POTS – Plain Old Telephone Service

    A term used for an analogue telephone network.

  • PPP – Point to Point Protocol

    An Internet standard for serial point-to-point communications and modem connections. The connection may be either dial-up (a non-permanent connection through a phone line) or fixed (a permanent connection through a leased line). The PPP defines the manner in which the packets are to be encapsulated into HDLC frames for transmission along the serial communication lines. It has already superseded the SLIP protocol, its predecessor, as it has a number advantages such as: IP heading compression, data compression, error correction, packet sequencing and authentication. It also comprises a controlling line protocol that initialises and configures the connection. It is defined by RFC 1331 through 1334.

  • PRI – Primary Rate Interface

    An ISDN technology access line comprising 30 independent 64 kbit B-channels and one 64 kbit/s D channel. The total transmission capacity is therefore 2.048 Mbit/s.

  • Proxy

    A program or computer with a program that provides workstation protection, administrative checking, and cache against the rest of the Internet network. It provides this activity in co-operation with or as a part of a server gateway, server firewall or server cache. Fixed connections on a local network are shared through the proxy server.

  • PSTN – Public Switched Telephony Network

    The term that is generally used for telephone networks.

  • Pulse dialling

    An old type of transmission of digits along the analogue connection. The digit is expressed by a series of pulses originated by connecting and disconnecting the phone loop. A duration of one pulse is 0.1 second. In the system usually used, one impulse indicates the digit 1, two impulses the digit 2 and so on, with ten impulses indicate the digit 0. In order to distinguish individual digits, there must be inserted a pause between them that lasts at least 0.5 seconds. Given the above-mentioned, it takes ten seconds to dial the digit 0. Pulse dialling can be transmitted reliably only to the nearest exchange. Another type is DTMF (tone dialling).

  • PVC – Permanent Virtual Circuit

    A fixed virtual connection between two terminal nodes that is created and terminated by a network administrator.

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