1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-0100522.2000(R2014) Quality of Service for Business Multimedia Conferencing As a leading technology and solutions development organization, ATIS brings together the top global ICT companies to advance the industrys most-pressing business priori
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16、rmine if any statement has been filed by a patent holder indicating a willingness to grant a license either without compensation or on reasonable and non-discriminatory terms and conditions to applicants desiring to obtain a license. ATIS-0100522.2000(R2014), Quality of Service for Business Multimed
17、ia Conferencing Is an American National Standard developed by the Quality of Service and Reliability (QoSR) Subcommittee under the ATIS Packet Technologies and Systems Committee (PTSC). Published by Alliance for Telecommunications Industry Solutions 1200 G Street, NW, Suite 500 Washington, DC 20005
18、Copyright 2014 by Alliance for Telecommunications Industry Solutions All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. For information contact ATIS at 202.628.6380. AT
19、IS is online at . AMERICAN NATIONAL STANDARD ATIS-0100522.2000American National Standard for Telecommunications Quality of Service for Business Multimedia Conferencing 1 1 Scope, Purpose and Application This document specifies classes of Quality of Service (QOS) sufficient to support Business Multim
20、edia Conferencing on Internet Protocol (IP) networks, defined as equivalent to legacy conference system performance (e.g., H.320 at Basic Rate Interface (BRI) rates). It also specifies the threshold of perceptible impairment for some user interface parameters. This standard applies to communications
21、 between a subset of multimedia end-points, namely Video Teleconference room systems and Desktop systems. The current scope is limited to H.323 point-to-point communication (Multipoint communication is for further study). It applies to cases where IP is utilized between the end-points (e.g., IP/Circ
22、uit-Switched Hybrid Network connections are for further study, e.g. networks supporting H.320-compliant terminals). Figure 1 illustrates some of the terminology of this clause. A user-to-user connection has components on the Customer Installation, and components of one or more network service provid
23、ers between the network interfaces. The Customer Installation includes a multimedia Figure 1 - User-to-User Connection on an IP Network TE TER R R RR R. . . . . .NetworkEnd-End Network (Bearer Service)NetworkNetworkCustomer Installation Customer InstallationUser-to-User Connection (Teleservice QOS)T
24、E RTerminal Equipment Router Protocol StackLAN LANIP Network CloudNI NININetwork InterfaceATIS-0100522.20002 communication system (Terminal Equipment, TE), and may contain a Local Area Network (LAN), routers, etc. Figure 1 includes equivalent ITU-T terms in parentheses (Teleservice and Bearer Servic
25、e). A Teleservice provides a complete user-to-user communications capability, while Bearer Services provide the transport of signals between network interfaces, and do not include the customers terminal equipment or local network. Furthermore, the Network Interface shown in Figure 1 is equivalent to
26、 the ITU-T user-network interface. All networks in the Figure are not necessarily identical, especially in regards to the position of functions such as authentication and billing. Resources (e.g., capacity) may be reserved on some networks comprising the connection, and not on others. Some networks
27、may not be IP-routed networks, e.g., dedicated lines, frame relay networks, and other networks where routers are not present within the administrative boundaries (shown as R in Figure 1). The user-to-user QOS is dependent on the quality and performance of all components that work to establish, or co
28、mprise the media connection. This standard will identify objectives for the user-to-user connection, and allocate portions to the Customer Installation (TE and LAN) and end-end network components. There are different suppliers for terminal equipment and network services, and the allocation will assu
29、re that the intended user-to-user performance levels are achieved. It will not allocate portions to individual network providers. The following are intended uses for this standard: 1. Network planning. 2. Network and Customer Installation component development. 3. User-to-User connection planning. I
30、n connection with User-to-User connection planning activities (item 3), it is necessary to stipulate the desired system type(s). Further, there are cases where certain measurement procedures must be agreed to in advance, since the standardized measurement coverage was incomplete at the time this sta
31、ndard was developed. Although this standard specifies IP network performance parameters, some Non-IP services procured must be evaluated using alternate parameter sets. Draft ITU-T Recommendation I.381, in development at the time this standard was prepared, provides a mapping between the IP layer an
32、d lower layer parameters. Another consideration is whether the Acceptable Level specified in this standard is the goal. When referenced for procurement purposes, the purchaser should specify which values of tables 5 through 12 apply. 2 Normative References The following standards contain provisions
33、which, through reference in this text, constitute provisions of this American National Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this American National Standard are encouraged to investigate the
34、possibility of applying the most recent editions of the standards below. T1.401-1993, Telecommunications Interface Between Carriers and Customer Installations Analog Voicegrade Switched Access Lines Using Loop-Start and Ground-Start Signaling1)_ 1)For electronic copies of some standards, visit ANSIs
35、 Electronic Standards Store (ESS) at www.ansi.org. For printed versions of all these standards, contact Global Engineering Documents, 15 Inverness Way East, Englewood, CO 80112-5704, (800) 854-7179. ATIS-0100522.20003 T1.801.01-1995, Telecommunications - Digital Transport of Video Teleconferencing/V
36、ideo Telephony Signals - Video Test Scenes for Subjective and Objective Performance Assessment1)T1.801.04-1997, Telecommunications - Multimedia Synchronization, Delay, and Frame Rate Measurement1)ITU-T Recommendation G.114 (02/96) - One-way transmission time1)ITU-T Recommendation H.320 (07/97) - Nar
37、row-band visual telephone systems and terminal equipment1)ITU-T Recommendation H.323 (02/98) - Packet-based multimedia communications systems1)ITU-T Recommendation I.380 - Internet Protocol Data Communication Service - IP Packet Transfer and Availability Performance Parameters1)ITU-T Recommendation
38、P.931 (12/98) - Multimedia communications delay, synchronization and frame rate measurement1)RFC 2330 - Framework for IP Performance Metrics 2)RFC 2679 - A One-way Delay Metric for IPPM 2)RFC 2680 - A One-way Packet Loss Metric for IPPM 2)RFC 2681 - A Round-trip Delay Metric for IPPM 2)3 Definitions
39、 for MM Conferencing QOS Parameters The following tables summarize the performance parameters of interest at the user and network interfaces. Table 1 - Quality of Service Parameters - MM User Interface Quality Criteria Communications Function Speed Accuracy Availability and Reliability Connection Es
40、tablishment Set-up Time Transfer Time Mis-directed Accessibility Ratio (among media) Connection Failure User Information Transfer Delay (Spontaneity)* Delay variation Contention ResolutionMedia Quality Media Synchronization* Dropped Connection Connection Release Take-down Time Release Failure * = pa
41、rameter specified in this standard _ 2)Internet Request For Comments (RFC) are available from the Internet Engineering Task Force (www.ietf.org) or from the RFC Editor (www.rfc-editor.org). ATIS-0100522.20004 Table 2 - Quality of Service Parameters - End-End Network Interface Quality Criteria Commun
42、ications Function Speed Accuracy Availability and Reliability Connection Establishment Set-up Time Transfer Time Mis-directed Accessibility* Connection Failure User Information (Packet) Transfer Delay* (Network Latency) Delay variation* (within a single media stream and between streams) Information
43、Bit Rate (Committed Bit Rate* Delivered Bit Rate) Lost Transport Packet Rate* (combines IP Packet defects, such as Errored & Lost Packets) Dropped Connection* (IP Availability) Connection Release Take-down Time Release Failure * = parameter specified in this standard Table 3 - Mapping Between Interf
44、aces MM Network MM User Latency Spontaneity Delay Variation Spontaneity, Media Quality, Media Sync Info Rate Media Quality, Media Sync Loss Ratio Media Quality, Media Sync 3.1 User-to-User Connection (Teleservice I.112) A type of telecommunication service that provides the complete capability, inclu
45、ding terminal equipment functions, for communication between users according to protocols established by agreement between Administrations or recognized operating agencies. 3.2 End-End Network (Bearer Service I.112) A type of telecommunication service that provides the capability for the transmissio
46、n of signals between user-network interfaces. ATIS-0100522.20005 3.3 Network Interface (user-network interface I.112) The interface between the terminal equipment and a network termination where the access protocols apply. 3.4 Customer Installation T1.401-1993 All telecommunication equipment and wir
47、ing on the customer side of the network demarcation point. 3.5 Frame T1.801.04 The smallest division of a media stream (defined by the measurement system) that conveys an independent, self-contained unit of content. 3.6 Active Frame (Non-Repeated Video Frame T1.801.04) An output video frame that is
48、distinguishable from its preceding frame(s) in the sequence (when the corresponding input sequence frames possess distinguishable differences). An Active Frame is assumed to have traversed the channel from input to output, and its delay may be included in the visual channel delay distribution. Since
49、 Active Frames convey new visual stimulus, they are the basis for calculation of frame inter-arrival time (and subsequently elementary frame rate). 3.7 Connection Set-up Time The elapsed time from the connection request to notification of remote alerting (or other response, such as station busy) measured at the originating terminal. 3.8 Connection Transfer Time The elapsed time from the transfer request to notification of remote alerting (or other response, such as station busy), measured at the requesting terminal. 3.9 Mis-directed Connection A
