Terms & Definitions
Term | Abbreviation | Description |
---|---|---|
Bandwidth | BW | The data exchange rate (measured in bps, Kbps, or Mbps) of a communications channel, such as an SRT stream. |
Bandwidth Overhead | The portion of the total bandwidth of an SRT stream that is required for the exchange of control and recovery packets. This value is usually calculated as a percentage of the base (TS) output bitrate of an encoder (video + audio + metadata + ancillary data). The sum of the base output rate plus the bandwidth overhead determines the maximum bandwidth that can be used by the SRT protocol. | |
Jitter | Jitter (measured in milliseconds) is the undesired deviation from true periodicity of an assumed periodic signal in electronics and telecommunications, often in relation to a reference clock source. In a computer network context, jitter is the variation in latency as measured in the variability over time of the packet latency across a network. | |
Local Area Network | LAN | A computer network that interconnects computers within a limited area such as an office building. |
Latency | The amount of time between the capture and display of a video frame, including the time it takes to encode, transmit and decode. With SRT, latency is a parameter that can be adjusted to increase the buffers at source and destination to allow those devices to adapt to network conditions. | |
Network Address Translation | NAT | A functionality that remaps one IP address to another. Network Address Translation allows a device, such as a router or firewall, to redirect traffic between the Internet and a private network. |
Packet Loss | Packet loss occurs when data packets fail to reach their destination. It can be caused by a number of factors including signal degradation over a network, channel congestion, corruption, faulty networking hardware, faulty network drivers, or normal routing routines, such as Dynamic Source Routing (DSR) in ad hoc networks. Packet loss is measured as a percentage of packets lost with respect to packets sent. | |
Packet Delay Variation | PDV | Packet Delay Variation is the difference in the end-to-end, one-way delay between selected packets in a flow, with any lost packets being ignored. [RFC 3393] |
Round-trip Time | RTT | Also called round-trip delay, RTT (measured in milliseconds) is the time required for a packet to travel from a specific source to a specific destination and back again. |
Secure Reliable Transport | SRT | A transport technology developed by Haivision that optimizes streaming performance across unpredictable networks such as the Internet. |
Virtual Private Network | VPN | A mechanism for connecting to a private network over a public network like the Internet. Most commonly, a VPN is used to provide a secure, encrypted tunnel through which a remote (authorized) user can access a company network. |