1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T G.820/I.351/Y.1501TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (07/2004) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital networks Quality and availability targets SERIES I: INTEGRATED SERVICES DIGITAL NETWORK Overall netw
2、ork aspects and functions Performance objectives SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT GENERATION NETWORKS Internet protocol aspects Quality of service and network performance Relationships among ISDN, IP-based network and physical layer performance Recommen
3、dations ITU-T Recommendation G.820/I.351/Y.1501 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CH
4、ARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 T
5、ESTING EQUIPMENTS G.500G.599 TRANSMISSION MEDIA CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 General aspects G.800G.809 Design objectives for digital networks G.810G.819 Quality and availability targets G.820G.829 Network capabilities and functions G.
6、830G.839 SDH network characteristics G.840G.849 Management of transport network G.850G.859 SDH radio and satellite systems integration G.860G.869 Optical transport networks G.870G.879 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 QUALITY OF SERVICE AND PERFORMANCE - GENERIC AND USER-RELATED AS
7、PECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DIGITAL TERMINAL EQUIPMENTS G.7000G.7999 DIGITAL NETWORKS G.8000G.8999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. G.820/I.351/Y.1501 (07/2004) i ITU-T Recommendation G.820/I.351/Y.1501 Relation
8、ships among ISDN, IP-based network and physical layer performance Recommendations Summary This Recommendation defines relationships among a set of existing ITU-T Recommendations that collectively provide the basis for the specification and apportionment of performance in narrow-band and broadband IS
9、DNs, Internet Protocol (IP)-based networks, and digital layers of transport networks, as well as jitter, wander, and network synchronization and timing performance. These Recommendations are intended to be used in describing performance between the measurement points that delimit and apportion inter
10、national ISDNs, IP-based networks, and digital layers of transport networks. Source ITU-T Recommendation G.820/I.351/Y.1501 was approved on 29 July 2004 by ITU-T Study Group 13 (2001-2004) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. G.820/I.351/Y.1501 (07/2004) FOREWORD The Internati
11、onal Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendation
12、s on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval
13、of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“
14、is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with
15、 the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required
16、 of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual
17、 Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. Howeve
18、r, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2004 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU
19、-T Rec. G.820/I.351/Y.1501 (07/2004) iii CONTENTS Page 1 Scope 1 2 Abbreviations 3 3 General scope and content of performance Recommendations 4 3.1 ITU-T Rec. G.781 Synchronization layer functions (1999) 4 3.2 ITU-T Rec. G.783 Characteristics of Synchronous Digital Hierarchy (SDH) equipment function
20、al blocks (2004) . 4 3.3 ITU-T Rec. G.798 Characteristics of optical transport network hierarchy equipment functional blocks (2004). 4 3.4 ITU-T Rec. G.803 Architecture of transport networks based on the Synchronous Digital Hierarchy (SDH) (2000). 5 3.5 ITU-T Rec. G.810 Definitions and terminology f
21、or synchronization networks (1996) 5 3.6 ITU-T Rec. G.811 Timing characteristics of primary reference clocks (1997) . 5 3.7 ITU-T Rec. G.812 Timing requirements of slave clocks suitable for use as node clocks in synchronization networks (2004). 5 3.8 ITU-T Rec. G.813 Timing characteristics of SDH eq
22、uipment slave clocks (SEC) (2003) . 5 3.9 ITU-T Rec. G.821 Error performance of an international digital connection operating at a bit rate below the primary rate and forming part of an ISDN (2002) 6 3.10 ITU-T Rec. G.822 Controlled slip rate objectives on an international digital connection (1988)
23、6 3.11 ITU-T Rec. G.823 The control of jitter and wander within digital networks which are based on the 2048 kbit/s hierarchy (2000) . 6 3.12 ITU-T Rec. G.824 The control of jitter and wander within digital networks which are based on the 1544 kbit/s hierarchy (2000) . 6 3.13 ITU-T Rec. G.825 The co
24、ntrol of jitter and wander within digital networks which are based on the synchronous digital hierarchy (SDH) (2000) . 6 3.14 ITU-T Rec. G.826 End-to-end error performance parameters and objectives for international, constant bit-rate digital paths and connections (2002) . 7 3.15 ITU-T Rec. G.827 Av
25、ailability performance parameters and objectives for end-to-end international constant bit-rate digital paths (2003). 7 3.16 ITU-T Rec. G.828 Error performance parameters and objectives for international, constant bit-rate synchronous digital paths (2000) 7 3.17 ITU-T Rec. G.829 Error performance ev
26、ents for SDH multiplex and regenerator sections (2002) 8 3.18 ITU-T Rec. G.921 Digital sections based on the 2048 kbit/s hierarchy (1988) . 8 iv ITU-T Rec. G.820/I.351/Y.1501 (07/2004) Page 3.19 ITU-T Rec. G.8201 Error performance parameters and objectives for multi-operator international paths with
27、in the Optical Transport Network (OTN) (2003). 8 3.20 ITU-T Rec. G.8251 The control of jitter and wander within the Optical Transport Network (OTN) (2001) 9 3.21 ITU-T Rec. I.350 General aspects of quality of service and network performance in digital networks, including ISDNs (1993) 9 3.22 ITU-T Re
28、c. I.352 Network performance objectives for connection processing delays in an ISDN (1993). 9 3.23 ITU-T Rec. I.353 Reference events for defining ISDN and B-ISDN performance parameters (1996) 9 3.24 ITU-T Rec. I.354 Network performance objectives for packet-mode communication in an ISDN (1993) 9 3.2
29、5 ITU-T Rec. I.355 ISDN 64 kbit/s connection type availability performance (2000) 10 3.26 ITU-T Rec. I.356 B-ISDN ATM layer cell transfer performance (2000) . 10 3.27 ITU-T Rec. I.357 B-ISDN semi-permanent connection availability (2000) . 10 3.28 ITU-T Rec. I.358 Call processing performance for swit
30、ched Virtual Channel Connections (VCCs) in a B-ISDN (2003) . 10 3.29 ITU-T Rec. I.359 Accuracy and dependability of ISDN 64 kbit/s circuit mode connection types (1999) 11 3.30 ITU-T Rec. I.381 ATM Adaptation Layer (AAL) Performance (2001) . 11 3.31 ITU-T Rec. Y.1530 Call processing performance for v
31、oice service in hybrid IP networks (2004) 11 3.32 ITU-T Rec. Y.1540 Internet protocol data communication service IP packet transfer and availability performance parameters (2002) . 11 3.33 ITU-T Rec. Y.1541 Network performance objectives for IP-based services (2002) 11 3.34 ITU-T Rec. Y.1560 Paramet
32、ers for TCP connection performance in the presence of middleboxes (2003). 12 3.35 ITU-T Rec. Y.1561 Performance and availability parameters for MPLS networks (2004) 12 Annex A History of the G-series error performance Recommendations 12 A.1 Background on the content of Annex A. 12 A.2 History of the
33、 G-series error performance Recommendations. 12 INDEX 15 ITU-T Rec. G.820/I.351/Y.1501 (07/2004) 1 ITU-T Recommendation G.820/I.351/Y.1501 Relationships among ISDN, IP-based network and physical layer performance Recommendations 1 Scope This Recommendation describes relationships among the following
34、 ITU-T Recommendations: G.781, G.783, G.798, G.803, G.810, G.811, G.812, G.813, G.821, G.822, G.823, G.824, G.825, G.826, G.827, G.828, G.829, G.921, G.8201, G.8251, I.350, I.352, I.353, I.354, I.355, I.356, I.357, I.358, I.359, I.381, Y.1530, Y.1540, Y.1541, Y.1560 and Y.1561. Collectively, these R
35、ecommendations provide the basis for the specification and apportionment of performance in narrow-band and broadband ISDNs, Internet Protocol (IP)-based networks, and digital layers of transport networks. They include jitter, wander, and network synchronization and timing performance. These Recommen
36、dations are intended to be used in describing performance between the measurement points that delimit and apportion international ISDNs, IP-based networks, and digital layers of transport networks. The relevant Recommendations and their relationships are illustrated in Figure 1. The 3 3 performance
37、description framework defined in ITU-T Rec. I.350 is used to illustrate the relationships among particular Recommendations. Three protocol-independent telecommunication functions are identified in the matrix: access, user information transfer, and disengagement. These general functions correspond to
38、 specified aspects of ISDN, IP-based network, and transport network digital layer services conforming to ITU-T standardized protocols1. Each function is considered with respect to three general performance concerns (or “performance criteria“): speed, accuracy, and dependability. These express, respe
39、ctively, the delay or rate, degree of correctness, and degree of certainty with which the function is performed. Recommendations shown within the matrix define sets of protocol-specific parameters (“primary parameters“) that describe performance relative to each function and criterion. An associated
40、 model provides a basis for describing overall service availability. A specified availability function compares the values for a subset of the primary parameters with corresponding outage thresholds to classify the services as “available“ (no service outage) or “unavailable“ (service outage) during
41、scheduled service time. Figure 1 presents the Recommendations that specify availability functions and define availability parameters associated with ISDN, IP-based network, and transport network digital layer services. Recommendations concerning jitter, wander, and timing and synchronization perform
42、ance of digital networks are illustrated in Figure 1 by their relationships to the complementary aspects of network level jitter, wander, and synchronization performance and related timing equipment performance. This Recommendation is organized as follows. The scope of the Recommendation is provided
43、 in clause 1. A list of abbreviations is provided in clause 2. The general scope and content of each Recommendation illustrated in Figure 1 is described in clause 32. Annex A contains information on the history of the G-series physical layer error performance Recommendations. An index listing key co
44、ncepts and associated Recommendations is also provided. _ 1For B-ISDN, these general functions include multiparty and multipoint connection types. 2The most recent editions of draft and approved Recommendations should be consulted. 2 ITU-T Rec. G.820/I.351/Y.1501 (07/2004) General performance aspect
45、s of ISDNs, IP-based networks and digital layers of transport networks I.350 (QoS/Network performance framework in digital networks, including ISDNs) I.353 (Reference events for defining ISDN performance parameters) ISDN, IP-based network and transport network digital layer performance Criterion Fun
46、ction Speed Accuracy Dependability Access I.352 (N-ISDN CBR) I.354 (N-ISDN PKT) I.358 (B-ISDN) Y.1530 (IP) Y.1560 (TCP) I.354 (N-ISDN PKT) I.358 (B-ISDN) I.359 (N-ISDN CBR) Y.1530 (IP) Y.1560 (TCP) I.354 (N-ISDN PKT) I.358 (B-ISDN) I.359 (N-ISDN CBR) Y.1530 (IP) Y.1560 (TCP) Information transfer I.3
47、54 (N-ISDN PKT) I.356 (ATM) I.381 (AAL) Y.1540 (IP) Y.1541 (IP) Y.1561 (MPLS) G.821 (CBR) G.826 (CBR) G.828 (CBR) G.829 (CBR) G.921 (CBR) G.8201 (OTN) I.354 (N-ISDN PKT) I.356 (ATM) I.381 (AAL) Y.1540 (IP) Y.1541 (IP) Y.1561 (MPLS) I.354 (N-ISDN PKT) I.356 (ATM) Y.1540 (IP) I.381 (AAL) Y.1541 (IP) Y
48、.1561 (MPLS) Disengagement I.352 (N-ISDN CBR) I.354 (N-ISDN PKT) I.358 (B-ISDN) Y.1530 (IP) Y.1560 (TCP) I.354 (N-ISDN PKT) I.358 (B-ISDN) I.359 (N-ISDN CBR) Y.1530 (IP) Y.1560 (TCP) I.354 (N-ISDN PKT) I.358 (B-ISDN) I.359 (N-ISDN CBR) Y.1530 (IP) Y.1560 (TCP) Availability G.827 (B-ISDN CBR) I.355 (
49、N-ISDN CBR key parameters are peak-to-peak jitter and associated measurement filter bandwidths. The error performance specifications refer to ITU-T Rec. G.821 for the performance objectives for the end-to-end connection of which the digital section in question is part. ITU-T Rec. G.921 specifies the allocation of the objective for the end-to-end connection given to the digital section. The error performance specifications utilize ev
