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In video teleconferencing, pertaining to a family of CCITT (now, ITU-T) Recommendations, where p is a non-zero positive integer indicating the number of 64 kb/s channels. Note: The p × 64 family includes Recommendations H.261, H.221, H.242, H.230, and H.320. These Recommendations form the basis for video telecommunications interoperability.
- Browse Related Terms: card validation, mileage, p × 64, public utilities commission (PUC), teleconference, teletraining, validation system
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1. In data communication, a sequence of binary digits, including data and control signals, that is transmitted and switched as a composite whole. Note: The data, control signals, and possibly error control information, are arranged in a specific format. 2. The fundamental unit of communication on the Internet.
- Browse Related Terms: bilateral synchronization, clock holdover mode, communications center, flow control, Packet, parallel-to-serial conversion, primary reference source, resettability, serial-to-parallel conversion, signals intelligence (SIGINT), streaming media, synchronous idle character (SYN), teleprinter
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A functional unit that enables data terminal equipment (DTE) not equipped for packet switching to access a packet-switched network.
- Browse Related Terms: burst transmission, call release time, channel service unit (CSU), circuit switching unit (CSU), circuit-switched data transmission service, closed user group, communications system, flow control procedure, packet assembler/disassembler (PAD), packet-mode terminal, Section, section boundary, traffic engineering, virtual call capability, who-are-you (WRU) character
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A packet layer reference event that corresponds to a packet entering a network section (from a circuit section) or a packet entering a DTE (from an access circuit section). [T1.504-1989]
- Browse Related Terms: cell relay, fast packet switching, frame relay, packet entry event, packet exit event, packet layer reference event, switched multimegabit data services (SMDS)
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A packet layer reference event that corresponds to a packet exiting a network section (to a circuit section) or a packet exiting a DTE (to an access circuit section). [T1.504-1989]
- Browse Related Terms: cell relay, fast packet switching, frame relay, packet entry event, packet exit event, packet layer reference event, switched multimegabit data services (SMDS)
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A type of firewall in which each packet is examined and either allowed to pass through or is rejected, based on local security policy. [INFOSEC-99]
- Browse Related Terms: Accounting, Audit, Audit Trail, Authorized user, communications profile, National Communications System (NCS), packet filter, security alarm, security audit, trusted process
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The action a device takes to selectively control the flow of data to and from a network. Packet filters allow or block packets, usually while routing them from one network to another (most often from the Internet to an internal network, and vice-versa). To accomplish packet filtering, you set up rules that specify what types of packets (those to or from a particular IP address or port) are to be allowed and what types are to be blocked.
- Browse Related Terms: ARPANET, Backbone, burst switching, connection-oriented mode transmission, end-to-end communication, first-route traffic, Martian, multicast, multilink operation, network utility, packet filtering, packet mode, packet switching, packet transfer mode, packet-switched data transmission service, packet-switching network, packet-switching node, PAD, screening router, switched network, trace packet, transmission control protocol, virtual circuit capability
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The structure of data, address, and control information in a packet. Note: The size and content of the various fields in a packet are defined by a set of rules that are used to assemble the packet.
- Browse Related Terms: abstract syntax, abstract syntax notation one (ASN.1), Automatic Code Gap (ACG), Code, concrete syntax, packet format, Sequence, signatory
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A header consisting of octets 4 to 8 (inclusive) of the frame (flags excluded from the octet numbers). [After T1.509-1995]
- Browse Related Terms: originating endpoint, packet header, packet stream, protocol discriminator (PD) field, sequence number (SEQ), terminating endpoint, unnumbered information (UI) frame, virtual data link capability (VDLC) protocol
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See ping.
- Browse Related Terms: acquisition and tracking orderwire, amplitude hit, basic group, certificate revocation list, channel supergroup, Extensible Markup Language, mastergroup, multicast backbone (Mbone), Network File System (NFS), packet Internet groper, personal identification number, phase hit, picowatt, primary group, push-down file, radio frequency, secure voice cord board, selective calling, self-electro-optic effect device, spike file, squatting, ultrawideband, usable line length, voice-operated device anti-sing, webzine
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The event that occurs when a packet crossing a section boundary changes the state of the packet layer interface. [T1.504-1989]
- Browse Related Terms: cell relay, fast packet switching, frame relay, packet entry event, packet exit event, packet layer reference event, switched multimegabit data services (SMDS)
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A mode of operating a communications network in which packet switching is used rather than message switching. [From Weik '89]
- Browse Related Terms: ARPANET, Backbone, burst switching, connection-oriented mode transmission, end-to-end communication, first-route traffic, Martian, multicast, multilink operation, network utility, packet filtering, packet mode, packet switching, packet transfer mode, packet-switched data transmission service, packet-switching network, packet-switching node, PAD, screening router, switched network, trace packet, transmission control protocol, virtual circuit capability
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Data terminal equipment (DTE) that can control, format, transmit, and receive packets.
- Browse Related Terms: burst transmission, call release time, channel service unit (CSU), circuit switching unit (CSU), circuit-switched data transmission service, closed user group, communications system, flow control procedure, packet assembler/disassembler (PAD), packet-mode terminal, Section, section boundary, traffic engineering, virtual call capability, who-are-you (WRU) character
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1. A dedicated device designed for the purpose of monitoring network traffic in order to recognize and decode certain packets of interest. 2. A software package that enables a general-purpose computer to recognize and decode certain packets of interest. [After 2382-pt.35] Note: The packet sniffer is normally used by system administrators for network management and diagnostics, but is occasionally used by hackers for illicit purposes such as stealing a user's password or credit-card number. [2382-pt.35] 3. In INFOSEC, synonym yysniffer.
- Browse Related Terms: Breach, content hosting (hosting), content provider, contingency procedure, forum, forward recovery, moderated conference, moderator, packet sniffer, plug-in, subscribe, Thread, USENET, viewer, virtual office, write access
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A collection of logical links multiplexed together onto one physical channel between two endpoints of the wideband packet network. [T1.509-1995]
- Browse Related Terms: originating endpoint, packet header, packet stream, protocol discriminator (PD) field, sequence number (SEQ), terminating endpoint, unnumbered information (UI) frame, virtual data link capability (VDLC) protocol
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A service that (a) provides for the transmission of data in the form of packets, (b) switches data at the packet level, and (c) may provide for the assembly and disassembly of data packets.
- Browse Related Terms: ARPANET, Backbone, burst switching, connection-oriented mode transmission, end-to-end communication, first-route traffic, Martian, multicast, multilink operation, network utility, packet filtering, packet mode, packet switching, packet transfer mode, packet-switched data transmission service, packet-switching network, packet-switching node, PAD, screening router, switched network, trace packet, transmission control protocol, virtual circuit capability
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The process of routing and transferring data by means of addressed packets so that a channel is occupied during the transmission of the packet only, and upon completion of the transmission the channel is made available for the transfer of other traffic.
- Browse Related Terms: ARPANET, Backbone, burst switching, connection-oriented mode transmission, end-to-end communication, first-route traffic, Martian, multicast, multilink operation, network utility, packet filtering, packet mode, packet switching, packet transfer mode, packet-switched data transmission service, packet-switching network, packet-switching node, PAD, screening router, switched network, trace packet, transmission control protocol, virtual circuit capability
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A switched network that transmits data in the form of packets.
- Browse Related Terms: ARPANET, Backbone, burst switching, connection-oriented mode transmission, end-to-end communication, first-route traffic, Martian, multicast, multilink operation, network utility, packet filtering, packet mode, packet switching, packet transfer mode, packet-switched data transmission service, packet-switching network, packet-switching node, PAD, screening router, switched network, trace packet, transmission control protocol, virtual circuit capability
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In a packet-switching network, a node that contains data switches and equipment for controlling, formatting, transmitting, routing, and receiving data packets. Note: In the Defense Data Network (DDN), a packet-switching node is usually configured to support up to thirty-two X.25 56-kb/s host connections, as many as six 56-kb/s interswitch trunk (IST) lines to other packet-switching nodes, and at least one Terminal Access Controller (TAC).
- Browse Related Terms: ARPANET, Backbone, burst switching, connection-oriented mode transmission, end-to-end communication, first-route traffic, Martian, multicast, multilink operation, network utility, packet filtering, packet mode, packet switching, packet transfer mode, packet-switched data transmission service, packet-switching network, packet-switching node, PAD, screening router, switched network, trace packet, transmission control protocol, virtual circuit capability