Document submitted to
Download 182.84 Kb.
|
- Navigate this page:
- Table of Contents
DOCUMENT SUBMITTED TO TR-30.3 Meeting
SOURCE: Editor, TIA-921-B CONTACT: Ed Schulz LSI Corporation 1110 American Pkwy NE Allentown, PA 18109 610-712-2068 Ed.Schulz@lsi.com TITLE: Proposed Outline and New Text for TIA-921-B PROJECT: PN-3-0062-RV2 DISTRIBUTION: Members of TR-30.3
____________________ ABSTRACT Rather than edit the draft TIA-921-B standard in place, it might be easier to review each proposed section on its own, or held beside the original document. The proposed outline and text are suggested by the existing TIA-921-A, and by presentations and discussions in TR-30.3 over the past few years. This text has been edited heavily during the August, 2010 and September, 2010 meetings. Table of ContentsForeword(This foreword is not part of this Standard.) ANSI-accredited committee TR-30.3 has developed this TIA-921-B Standard, which defines an IP network model. This model, along with the specified scenarios, are intended for evaluating and comparing communications equipment connected over a converged network. Building upon the experience of creating network nodels, TR-30.3 Subcommittee has created this Network Model for IP Impairments using the similar methodology developed in its previous standards and bulletins: EIA/TIA-496-A-1989: Interface Between Data Circuit Terminating Equipment (DCE) and the Public Switched Telephone Network, which includes a Network Model for Evaluating Modem Performance TIA TSB-37-A-1994: Telephone Network Transmission Model for Evaluating Analog Modem Performance, which became ITU-T Recommendation V.56bis-1995 TIA TSB-38-1994 (and TSB-38-A -2007): Test Procedures for Evaluation of 2-Wire 4 Kilohertz Voice Band Duplex Modems, which became ITU-T Recommendation V.56ter-1996 ANSI/TIA/EIA-3700-1999: Telephone Network Transmission Model for Evaluating Analog Modem Performance ANSI/TIA/EIA-793-2001: North American Telephone Network Transmission Model for Evaluating Analog Client and Digitally Connected Server Modems ANSI/TIA-876-2002: North American Network Access Transmission Model for Evaluating xDSL Modem Performance TIA-921-B was approved on [insert date]. It cancels and replaces TIA-921-A (2008) in its entirety. Technical changes from TIA-921-A include: TIA-921-B models the mechanisms that contribute to packet delay, jitter, and loss: interfering streams, queueing delays in network elements, and the characteristics of specific access technologies. The intent is to provide more realism than the earlier version. TIA-921-A defined a mathematical model that fit certain observed network behavior, but was not easily extended to other scenarios. The “likelihood of occurrence” concept is no longer applied to IP networks. TIA-921-B is a true bidrectional model. Impairment levels are updated to keep current with evolving IP networks. The number of standard test cases is greatly reduced. Users can customize test cases to fit their specific needs.
IntroductionTIA-921-B describes a model of Internet Protocol (IP) networks for the purpose of evaluating the performance of IP streams. The focus is on packet delay, delay variation, and loss. IP streams from any type of network device can be evaluated using this model. Emphasis is given to the fact that manufacturers of communications equipment and service providers are interested in a specification that accurately models the IP network characteristics that determine performance. Evaluators desire a definitive set of simple tests that properly measure the performance of communications devices from various manufacturers. Therefore, the objective of this standard is to define an application-independent model (e.g. data, voice, voiceband data, and video) that is representative of IP networks, that can be simulated at reasonable complexity, and that facilitates practical evaluation times. The IP network model presented herein represents a snapshot of actual network data provided by anonymous IP service providers and IP network equipment manufacturers in the 2010 timeframe, and will continue to evolve as more statistical information becomes available and as the IP network evolves. Network Model for Evaluating Multimedia Transmission Performance Over Internet Protocol Directory: TR-30 -> TR-30.3 -> Public Public -> Ansi/tia-921-b network Model for Evaluating Multimedia Transmission Performance Over the Internet Protocol TR-30 -> Document submitted to Download 182.84 Kb. Share with your friends:
|