Ansi/tia-921-b network Model for Evaluating Multimedia Transmission Performance Over the Internet Protocol
Download 1.57 Mb.
|
- Navigate this page:
- 3Definitions and Abbreviations
- 3.2Abbreviations
2Informative ReferencesAt the time of publication, the editions indicated were valid. All Recommendations, standards, and bulletins are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards published by them. ETSI TIPHON TR 101 329 - Part 2, Quality of Service (QoS) Classes IEEE 802.11A-1999, Information Technology Telecommunications and Information Exchange Between Systems – LAN/MAN IEEE 802.11B/COR 1-2001, Wireless LAN MAC and PHY Specifications Amendment 2: Higher Speed Physical Layer Extension in the 2.4GHz Band IEEE 802.11G-2003, Wireless LAN MAC and PHY Specifications Amendment 4: Further High Data Rate Extension in the 2.4GHz Band ITU-T Recommendation G.1050 (2007), Network Model for Evaluating Multimedia Transmission Performance over Internet Protocol ITU-T Recommendation G.107 (2009), The E-model, a computational model for use in transmission planning ITU-T Recommendation G.108 (1999), Application of the E-model: A planning guide ITU-T Recommendation G.114 (2003), One way transmission time ITU-T Recommendation T.38 (2007), Procedures for real-time Group 3 facsimile communication over IP networks ITU-T Recommendation V.150.0 (2003), Modem-over-IP Networks: Foundation ITU-T Recommendation V.150.1 (2003), Procedures for the end-to-end connection of V-series DCEs over an IP Network ITU-T Recommendation V.152 (2005), Procedures for supporting Voice-Band Data over IP Networks ITU-T Recommendation Y.1541 (2006), Network performance objectives for IP-Based services ANSI/TIA-810-B-2006, Telecommunications – Telephone Terminal Equipment – Transmission Requirements for Narrowband Voice over IP and Voice over PCM Digital Wireline Telephones TIA-1001 (2004), Transport of TIA-825-A Signals over IP Networks TIA TSB116-A-2006, Telecommunications – IP Telephony Equipment – Voice Quality Recommendations for IP Telephony ANSI/TIA-912-A-2004, Telecommunications – IP Telephony Equipment – Voice Gateway Transmission Requirements 3Definitions and Abbreviations3.1DefinitionsFor the purposes of this Standard, the following definitions shall apply. burst loss – a high density of packet loss over time, or loss of sequential packets, due to congestion, bandwidth limitation, line errors, or rerouting (delay translated into loss due to implementation) on the network. delay – the time required for a packet to traverse the network or a segment of the network. See latency. downstream – a transmission from a service provider toward an end user. gateway – a network device that acts as an entrance to another network. One function is to convert media provided in one type of network to the format required in another type of network. For example, a gateway could terminate bearer channels from a switched circuit network (e.g., DS0s) and media streams from a packet network (e.g., RTP streams in an IP network). interferer – a packet stream that contends with the test stream of interest for a limited network resource, such as a link buffer. IP Network – a network based on the Internet Protocol. jitter – variation in packet delay. latency – an expression of how much time it takes for a packet of data to get from one designated point to another. See delay. microburst – a packet traffic pattern characterized by short periods of high activity, and where the bursts are not readily detectable when measuring average traffic rate over a period of one second or longer. MTU Size – the largest size data-link packet or frame (specified in octets) that can be sent in a packet- or frame-based network such as the Internet packet loss – the failure of a packet to traverse the network to its destination. Typically packet loss is caused by packet discards due to buffer overflow. This model does not take into account packet loss due to discards in the terminal jitter buffer. peak jitter – the maximum variation of delay from the mean delay. peak-to-peak jitter – the full range of packet delay from the maximum amount to the minimum amount. peer-to-peer – a distributed application architecture that partitions tasks or workloads between peers. Peers are equally privileged, equipotent participants in the application. QoS Edge Routing – routing that typically takes place between the customer premises network and the service provider network based on Quality of Service classification values. reordered packets– A packet that arrives at the destination with a packet sequence number that is smaller than the previous packet is deemed a reordered packet. route flap – repeated changes in a path due to updates to a routing table. The network model simulates the effect of route flaps by making incremental changes in the delay values of the core segment. sequential packet loss – two or more consecutive lost packets. upstream – a transmission from an end user toward a service provider. 3.2AbbreviationsFor the purposes of this Standard, the following abbreviations shall apply. BER: Bit Error Ratio CATV: Cable Television CBR: Constant Bit Rate CSV: Comma-Separated Values (file format) DSL: Digital Subscriber Line DSLAM: DSL Access Multiplexer HD: High-Definition video HTTP: Hypertext Transport Protocol IP: Internet Protocol IPTV: Internet Protocol Television (UDP) LAN: Local Area Network MTU: Maximum Transmission Unit OLT: Optical Line Termination ONT: Optical Network Termination OTT: Over-the-top (TCP streaming video) PBS: Peak Burst Size (pcap generator) pcap: Packet Capture (file format) PIR: Peak Information Rate (pcap generator) POTS: Plain Old Telephone Service PSTN: Public Switched Telephone Network QoS: Quality of Service SD: Standard-Definition video SLA: Service Level Agreement TCP: Transmission Control Protocol UDP: User Datagram Protocol VBR: Variable Bit Rate VoIP: Voice over Internet Protocol VTC: Video Teleconferencing Directory: TR-30 -> TR-30.3 -> Public -> 1108%20Arlington Public -> Document submitted to TR-30 -> Document submitted to Download 1.57 Mb. Share with your friends:
|