NDI Glossary

Cache refers to a reserved section of computer memory or an independent high-speed storage device used to accelerate access and retrieval of commonly used data.

A domain refers to a LAN subnetwork of users, systems, devices and servers. Domain can also refer to the IP address of a website on the Internet.

DNS (Doman Name System) is a system used by the Internet and private networks to translate domain names into IP addresses.

mDNS (Multicast DNS) refers to the use of IP multicast with DNS to translate domain names into IP addresses and provide service discovery in a network that does not have access to a DNS server.

Ethernet, standardized as IEEE 802.3, refers to a series of LAN (Local Area Network) technologies used to connect computers and other devices to a home or business network. Ethernet is a physical and data link layer networking protocol that supports data transfer rates starting at 10 Mbps, typically over twisted pair cabling, but also fiber optic and coaxial cabling.

IGMP (Internet Group Management Protocol) is the protocol used in IP multicasting that allows a host to report its multicast group membership to networked routers in order to receive data, messages or content addressed to the designated multicast group.

IP (Internet Protocol) is the communications protocol for the Internet, many wide area networks (WANs) and most local area networks (LANs) that defines the rules, formats and address scheme for exchanging datagrams or packets between a source computer or device and a destination computer or device.

IPv4 (Internet Protocol Version 4) is the fourth and most commonly used version of the Internet Protocol. IPv4 uses a 32-bit IP address scheme for network identification and communication, with each unique IP address expressed as four numbers (between 0 and 255) separated by decimal points.

IPv6 (Internet Protocol Version 6) is the latest version of the Internet Protocol, developed to eventually replace IPv4 (Internet Protocol Version 4). IPv6 uses a 128-bit IP address scheme for network identification and communication, with each unique IP address expressed as eight groups of four hexadecimal digits (numbers from 0-9 or letters from A-F) separated by colons. In addition to increasing the number of available IP addresses exponentially, IPv6 simplifies and streamlines network communication, while increasing security, compatibility, and efficiency.

LAN (Local Area Network) is a network that connects computers and devices in a room, building or group of buildings. LANs are typically deployed in homes, offices, and schools, where users share access to the same server, resources, and data storage. A system of LANs can also be connected to form a WAN (Wide Area Network).

Layer 2
Layer 2 refers to the second layer, or Data Link layer, of the OSI networking model. A layer 2 switch uses hardware-based switching to transmit data between connected devices based on their MAC (Media Access Control) layer addresses.

Layer 3
Layer 3 refers to the third layer, or Network layer, of the OSI networking model. A layer 3 switch uses hardware-based switching to transmit data between connected devices based on their IP (Internet Protocol) addresses. A layer 3 switch can support packet inspection and routing protocols to prioritize and forward traffic.

MAC Address
MAC (Media Access Control) address refers to a unique physical address that identifies a network node.

Mbps (Megabits per second) is a unit of measurement for data transfer speed, with one megabit equal to one million bits. Network transmission are commonly measured in Mbps.

NDI (Network Device Interface) is an open protocol developed by NewTek for IP transmission and live production using standard LAN networking. NDI allows networked video systems to identify and communicate with each other over IP, and encode, transmit and receive multiple streams of broadcast-quality, low-latency, frame-accurate video and audio in real time.

The OSI (Open System Interconnection) reference model is a standard that defines worldwide network communication, developed by ISO (International Organization for Standardization). The OSI reference model divides network communication into seven layers: 1) Physical, 2) Data Link, 3) Network, 4) Transport, 5) Session, 6) Presentation, and 7) Application.

Packet (Frame)
A packet, also known as a frame or datagram, is a unit of data transmitted over a packet-switched network, such as a LAN, WAN or the Internet.

A port is a communications channel for data transmission to and from a computer on a network. Each port is identified by a 16-bit number between 0 and 65535, with each process, application or service using a specific port, or multiple ports, for data transmission. Port can also refer to a hardware socket used to physically connect a device or device cable to your computer or network.

Qos (Quality of Service) is the measure of performance for system or network, with considerations that include availability, bandwidth, latency and reliability. QoS can also refer to the prioritization of network traffic to ensure a minimum or required level of service, predictability, and/or control.

Subnet (short for subnetwork) refers to a distinct subdivision of an IP network, usually created for performance or security purposes. Subnets typically include the computers, systems and devices in one location, office or building, with all nodes sharing the same IP address prefix.

TCP (Transmission Control Protocol) is a network communications protocol which enables two host systems to establish a connection and exchange data packets, and ensures data is delivered, intact, to the correct destination. TCP is typically grouped with IP (Internet Protocol) and known collectively as TCP/IP.

UDP (User Datagram Protocol) is an alternative protocol to TCP that is used when reliable delivery of data packets in not required. UDP is typically used for applications where timeliness is of higher priority than accuracy, such as streaming media, teleconferencing and voice over IP (VoIP).

WAN (Wide Area Network) is a network that spans a relatively broad geographical area, such as a state, region or nation. WANs typically connects multiple smaller networks, such as LANs (Local Area Network) and MANs (Metropolitan Area Network). The Internet is an example of a WAN.


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