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In a wireless environment, passive scanning is when a client listens passively for access point beacons that indicate available networks that it may attempt to associate with.
Peak Cell Rate (PCR)
Peak Cell Rate (PCR) is the ATM traffic descriptor for the maximum rate at which cells can be transported.
Peak-to-Peak Cell Delay Variation (CDV)
Peak-to-Peak Cell Delay Variation (CDV) is the ATM QoS parameter for the difference between the maximum and minimum cell transfer delay experienced during the connection.
Permanent Virtual Circuits (PVCs)
Permanent virtual circuits (PVCs) are connections that are like leased lines in that the service provider defines a permanent path to each customer location. PVCs are always on and ready to use. Frame Relay and ATM networks use PVCs.
Physical Cable Segment
A physical cable segment is the cable or wire used to connect network devices.
Physical Layer/Layer 1
In the OSI Reference Model and the Five-Layer Reference Model, Layer 1 is the Physical Layer. Layer 1 is where binary digits, or bits, move across a physical medium. Layer 1 defines the electrical or optical signal that equals a one, and the signal that equals a zero. Physical Layer standards include cabling specifications, electrical or optical signaling, and lower-level framing of ones and zeros.
Picture modes are selectable from a range of camera scenes in the setting menu to optimize picture quality in various applications.
Plain Old Telephone Service (POTS) lines
Plain Old Telephone Service (POTS) lines are analog copper phone lines capable of data transfer speeds of up to 30 kbps.
PoE (Power-over-Ethernet, IEEE 802.3af)
PoE enables networked devices to receive power (up to 12.95 W) from PoE-enabled equipment through the same Ethernet cable that transports data. It provides substantial installation cost savings, and can simplify the installation process.
Point-to-Point connections are dedicated communication lines between two locations, such as T1/T3 or E1/E3 lines using PPP as the Layer 2 protocol.
Point-to-Point Protocol (PPP)
Point-to-Point Protocol (PPP) is a WAN Layer 2 protocol that runs over a dedicated leased line between two locations.
A server for storing incoming e-mail until you have read it.
PPP Authentication Protocols
PPP Authentication Protocols are used to verify the identity of a user. Common PPP authentication protocols include Password Authentication Protocol (PAP), Challenge Handshake Authentication Protocol (CHAP), Microsoft Challenge Handshake Authentication Protocol (MS CHAP), and Extensible Authentication Protocol (EAP).
In an Ethernet LAN, the preamble is a specific short sequence of bytes used by a network interface controller to allow receiving devices to recognize the start of a new frame. The preamble is not considered part of the Ethernet frame itself.
Presentation Layer/Layer 6
In the OSI Reference Model, Layer 6 is the Presentation Layer. The Presentation Layer accepts the data from the Application Layer and converts or encodes it into a standard format that the Application Layer on the other computer can understand. For example, text can be encoded as ASCII or HTML, while graphics can be encoded using standard formats like JPEG or TIFF. The Presentation Layer can also involve standard data compression or data encryption schemes, ensuring that the receiving computer can properly uncompress or decipher the data.
Primary DNS server
One of the DNS servers that can first reply to a request by connected devices or other DNS servers.
Projector Configuration File (PCF)
A file that is put into the TI DCinema projectors in order to configure the projector to a standardized set-up
PROM stands for Programmable Read-Only Memory. A PROM chip is a special chip that initially has no programming encoded. Device manufacturers can inexpensively encode, or burn, a PROM chip, but this can only be done once and the programming cannot be changed later. Manufacturers use a PROM chip to store the unique MAC address on each NIC.
A protocol is a formal set of written rules or procedures that computers must understand, accept, and use to be able to talk to each other over a network. Different protocols are used at different layers of the reference model. Two computers must use the same protocol at the same layer for the data to be communicated correctly.
Provider Edge (PE) Router
A Provider Edge (PE) router is a type of edge router used in MPLS VPNs, and must provide completely private and secure connectivity within a VPN. PE routers also exchange routing information with customer edge routers and other PE routers within the VPN. The PE routers store the customer's routing information in a Virtual Routing and Forwarding table or instance.
Provider (P) Routers
Provider (P) routers are transit LSRs that do not connect to customer devices and perform only label switching.
A server or software that acts as an intermediary between a local network and the Internet so that it can connect to the Internet in place of a computer on a local network.
Quality of Service (QoS)
Quality of Service (QoS) is the level of service guaranteed by a WAN service provider.
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 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)
The RFC 4291 standard specifies rules regarding prefix notation for IPv6.
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 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.
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.
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.
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.
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.
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
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.
A server for sending or relaying e-mail messages between servers.