Network Technologies ASI-IP-GTW, DVB-ASI to IP user manual

ASI-IP-GTW User's Manual

format. Three versions exist. IGMPv2 is common today but IGMPv3 is the next step.

Meta-data:Meta-data is descriptive data that is "tagged" to a movie or audio clip. Meta-data is essential for the broadcaster.

MPEG2: Moving Picture Experts Group 2. The compression standard used today on most satellite and cable TV digital broadcasts.

MPLS: Multi-protocol Label Switching. A Quality of Service mechanism for IP networks that allow IP packets to flow along a predefined path in a network, improving the reliability and robustness of the transmission.

MPTS: Multi Program Transport Streams. Transport Streams that carry multiple TV/Radio services.

Multicast: An IP mechanism that allows transmission of data to multiple receivers. A multicast can also have several transmit sources simultaneously. In video applications, multicast is typically used to distribute a video signal from a central source to multiple destinations.

NMS: Network Management System. A system used to supervise elements in an IP network. When a device reports an alarm, the alarm will be collected by the NMS and reported to the operator. NMS systems typically collect valuable statistics information about the network performance and can warn the operator early.

PCR: Program Clock Reference. A sampled 27MHz video clock used in MPEG2 Transport Streams. The primary purpose of the PCR is timing synchronization between transmitter and receiver.

PSI/SI: Program Specific Information / Service Information. This is information tables (meta-data) that is carried in MPEG2 transport streams in addition to video and audio. The information carried is typically service/program IDs, program names, conditional access information etc.

QAM: Quadrature Amplitude Modulation. A digital modulation type that is used for transmission of digital TV signals over cable TV networks. Often referred to as DVB-C.

QoS: Quality of Service. A common term for a set of parameters

describing the quality you get from an IP network: Throughput, availability, delay, jitter and packet loss.

QPSK: Quadrature Phase-Shift Keying. The digital modulation type typically used for transmission of digital TV signals over satellite. Often referred to as DVB-S.

RIP2: Routing Information Protocol v2. A protocol used between network routers to exchange routing tables and information.

RSVP: ReSerVation Protocol. A Quality-of-service oriented protocol used by network elements to reserve capacity in an IP network before a transmission takes place.

RTP: Real-time Transfer Protocol. A protocol designed for transmission of real-time data like video and audio over IP networks. RTP is used for most video over IP transmissions.

SDI: Serial Digital Interface. Also known as ITU-R BT.656. A specification describing how to digitize and transmit uncompressed video signals. The typical bit rate of an SDI signal is 270Mbit/s.

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