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Real-Time Variable Bit Rate (rt-VBR or real-time VBR)

Real-Time Variable Bit Rate (rt-VBR or real-time VBR) is the ATM service category that is used for compressed video applications that can tolerate bandwidth variations but that are sensitive to both cell loss and delay variation.

Regional Internet Registries (RIRs)

Regional Internet Registries (RIRs) are regional organizations overseeing IP address assignment within a particular region of the world. Currently, five RIRs exist.

Registered Ports

Registered Ports are software ports in the range 1024 to 49151 and the Internet Assigned Numbers Authority also manages and registers these ports. Less common TCP IP applications use these port numbers.


A repeater is a physical layer device used to connect two or more separate physical cable segments together, making it act like one long cable. A repeater is a simple hardware device that regenerates electrical signals, sending all frames from one physical cable segment to another.


The number of pixels in an image. DCI specification dictates two resolutions; 2K (2048 x 1080) pixels as the minimum, 4K (4096 x 1080)

RFC 4291

The RFC 4291 standard specifies rules regarding prefix notation for IPv6.

RFC 5952

The RFC 5952 standard specifies key requirements for the representation of IPv6 addresses. The format should be followed by people and systems when representing IPv6 addresses as text, but systems should be able to accept and handle any legitimate IPv6 format.


A router is a Layer 3 device that allows communication between separate broadcast domains or networks. In order to forward data from one network to another, routers must know how to reach other networks. A router stores network location information in a routing table. Each entry in the routing table includes the destination network number and indicates how the destination network may be reached by specifying which port or interface on the router should be used and what 'Next Hop' address should be used. When a router receives a packet, the router uses the data's Layer 3 destination address and the routing table to make intelligent decisions on where to send the packet next. Routers can read, but cannot modify, Layer 3 addresses. Routers change Layer 2 addresses in data whenever they route data.

Route Summarization

Route summarization is also known as route aggregation. It combines a group of network numbers into a single route and makes routing traffic across the network and the Internet much more efficient because it involves fewer routes in the routing table and fewer routes to advertise.

Routing Information Protocol (RIP)

Routing Information Protocol (RIP) is a routing protocol by which routers in one network learn how to communicate with routers in another network.

Routing Table

The routing table is where a router stores network location information including all possible destination network numbers and how to reach them. Each entry in the routing table includes the destination network number, the next hop along the way to the destination network, and which port or interface on the router should be used to reach the next hop.



The degree to which the color is pure.

Screen Management System (SMS)

The user interface that a theater manager would use to control a single screen's system including start, stop, the creation or selection of a Show Playlist and editing of a Show Playlist. It is required that each auditorium has one SMS.

Secondary DNS Server

Subsidiary DNS server used when a primary DNS server cannot be used.

Security Manager (SM)

The controlling device of a security system in either the encoding system, distribution system or the theater playback process.


A segment is one unit of data encapsulated at Layer 4, or the Transport Layer. Each segment is divided into two parts, a header followed by data. The segment header contains the data's destination port number, which indicates which application layer protocol should be used to process the data on the receiving computer. It also specifies a source port number, which uniquely identifies the connection on the sending side, allowing the receiving computer to carry on multiple sessions with the sending computer without intermixing the data.

Service Provider

A service provider is a business such as a telephone company that provides WAN carrier network services to other businesses. Also called WAN service providers, telcos, WAN carriers, carriers.

Session Layer/Layer 5

In the OSI Reference Model, Layer 5 is the Session Layer. The Session Layer establishes, manages, and ends the connections or sessions between the applications on the communicating computers. For example, a Web conferencing application has to maintain separate sessions for each user participating in the conference. The server runs one conference application, but tracks each session individually.

Shared Bus

A shared bus is a physical network topology or layout in which multiple devices are connected to the same physical wire or cable. When one device transmits data, all other devices on the shared bus receive it.


The degree to which the boundary of two portions is clearly distinguished.

Show Playlist

A playlist that describes the order of how the Compositions should play back and is typically created by exhibition and transferred to the equipment controlling a particular screen. The exhibitor could have multiple Show Playlists (see picture on cover)

Show Playlist (used in TMS) Content Element (Nested) (used in SMS)

These statements both refer to sequences of content one after another. This sequence can be made up of other Show Playlists, Composition Playlists and Black Frames.

Smartphone Viewer

The Smartphone Viewer enables an image of the camera to be displayed on a smartphone screen. In addition, the cameras pan, tilt, and zoom functions can be controlled by simple touch-panel manipulation.

SMS -Control Event

A command that will cue an Automation Function

SMS Title

An Element of Content that will make up part of a Composition Playlist or Show Playlist


The Simple Mail Transfer Protocol (SMTP) is the most popular protocol for sending electronic mail on the Internet.

SMTP server

A server for sending or relaying e-mail messages between servers.

SNC toolbox mobile

SNC toolbox mobile is a convenient smartphone/tablet app (supported by Android and iOS) that is intended for use in installation of a camera. It allows you to view*1 live camera images and adjust the field of view with your cameras zoom and focus control buttons. In addition to live image viewing, this app allows you to control*2 zoom and focus as well as other view-related features of the SNC-VM772R 4K camera on your smartphone touchscreen. *1 A Wi-Fi router must be installed in the network. *2 The optional IFU-WLM3 USB wireless LAN module must be attached to the camera.


A protocol for monitoring and managing network devices.

Software Ports

Software ports are specific to the Transport Layer, and are used to route data to the appropriate Application Layer protocol and ultimately the correct application program.

Solid PTZ

Solid PTZ can navigate the cameras visible area in the captured images by its digital pan, tilt, and zoom functionalities. This can be used to monitor particular points of interest during the operation.

Spanning Tree Protocol

The Spanning Tree Protocol (STP) selectively disables forwarding on individual ports of a bridge or switch to ensure that the network topology is loop free. This prevents forwarding storms.


Subnet is short for sub-network and is the splitting of a single network number into smaller networks by changing the mask assigned to each broadcast domain.

Subnet mask

32-bit stream used to decide how many upper bits will be used for the network address within the IP address so as to distinguish the network.

Subtitle using Subpictures

One of the two ways of subtitling in DCinema - would be used for the display of special characters like certain Asian characters. Graphics are prerendered for display and are called up on-screen by a script

Subtitle using Timed Text

One of the two ways of subtitling in DCinema - subtitles are rendered out during play out at the theatre

Summary Route

Summary route is the address range allocated to a specific location.


Supernet is the aggregation of many classful network numbers into a single address or routing table entry.

Sustainable Cell Rate (SCR)

Sustainable Cell Rate (SCR) is the ATM traffic descriptor for the maximum average cell transfer rate over an extended period of time.


A switch is a Layer 2 network device that enables full-duplex data transmission. Because switches dedicate a single port to each end-user device, collision domains have only two devices-the end-user device and the switch. When connected to a switch, an end-user device can send and receive data simultaneously. A switch builds a MAC address table that it uses to manage traffic flow. Switches operate based on reading Layer 2 frame information only. They cannot change Layer 2 addresses, and they do not have any access to Layer 3 data. In addition to basic Ethernet connectivity, switches make possible virtual LANs.

Switched Virtual Circuits (SVCs)

Switched virtual circuits (SVCs) are connections that dynamically establish only when data needs sending and terminates when the transmission is complete. Frame Relay and ATM networks use SVCs.

Synchronous Digital Hierarchy (SDH)

Synchronous Digital Hierarchy (SDH) is a standard that defines a basic frame format and a hierarchy of signaling speeds for use on a fiber optic line. SDH operates at Layer 1 or the Physical Layer and is available outside of North America and Japan.

Synchronous Optical Network (SONET)

Synchronous Optical Network (SONET) is a standard that defines a basic frame format and a hierarchy of signaling speeds for use on a fiber optic line. SONET operates at Layer 1 or the Physical Layer and is available in North America and Japan.

Synchronous Transport Module (STM)

Synchronous Transport Module (STM) is the frame format used by SDH. In the SDH hierarchy, the lowest or base-level signal is the STM-1 which operates at 155.52 Mbps. The STM Level indicates the speed of an STM-n line where the n is multiplied by 155.52 Mbps. For example, an STM-4 signal has the bit rate of (4 * 155.52 Mbps) or 622 Mbps.

Synchronous Transport Signal (STS)

Synchronous Transport Signal (STS) is the frame format used by SONET. In the SONET standard, the lowest or base-level signal is the Synchronous Transport Signal level 1 (STS-1). An STS-1 operates at 51.84 Mbps, which is enough to carry an entire DS3 link.


T1 Line

A T1 line is a dedicated copper telephone line that supports data rates of 1.54 Mbps. A T1 line operates at Layer 1 or the Physical layer and is commonly available in North American and Japan. A T1 line consists of 24 individual channels or DS0s, each of which supports 64 Kbps. Each channel or DS0 can transport voice or data. A customer can lease an entire T1 line or only a few channels, which is known as fractional T1 service. The equivalent line outside of North America and Japan is an E1 line.

T3 Line

A T3 line is a dedicated copper telephone line that supports data rates of 44.74 Mbps and like a T1, is also built on the base DS0 signal. A T3 is 28 DS1s-or 672 DS0s-bundled together.


Transmission Control Protocol (TCP) is a protocol for sending data that provides delivery notification, error checking, and recovery procedures. With TCP, the receiving computer tells the sending computer when the data was received.

TCP/IP Reference Model

The TCP/IP Reference Model is a simple four-layer model developed by the Department of Defense and the Internet Engineering Task Force. This model defines specific protocols at each of the four layers, such as TCP and IP, two of the Internet's core protocols. The four layers of the TCP/IP Model are as follows: Application Layer, Transport Layer, Internet Layer, Network Access Layer


The Trivial File Transfer Protocol (TFTP) is a network protocol used to transfer data from one computer to another through a network, such as over the Internet.

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