Terms & Definitions

Last updated on Sep 14, 2020

TermAbbreviationDescription
BandwidthBWThe 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 NetworkLANA 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 TranslationNATA 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 VariationPDVPacket 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 TimeRTTAlso 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 TransportSRTA transport technology developed by Haivision that optimizes streaming performance across unpredictable networks such as the Internet.
Virtual Private NetworkVPNA 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.