1、STDSITU-T RECMN GaBbL-ENGL L99b 48b2591 Ob32482 b95 = I NTERNATI ONAL TELECOMM UN I CATION UN I ON ITU=T TELECOMMUNICATION STAN DARDIZATI ON SECTOR OF ITU G.861 (0896) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital transmission systems - Digital networks - SDH network
2、 ch a racte ri st ics Principles and guidelines for the integration of satellite and radio systems in SDH transport networks ITU-T Recommendation G.861 (Previously CCITT Recommendation) STD-ITU-T RECMN G-8bL-ENGL L77b W 48b257L Ob32483 521 6 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND ME
3、DIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS INTERNATIONAL ANALOGUE CARRIER SYSTEM GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER- TRANSMISSION SYSTEMS INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES GENERAL CHARAC
4、TERISTICS OF INTERNATIONAL CARRIER TELEPHONE WITH METALLIC LINES TRANSMISSION MEDIA CHARACTERISTICS DIGITAL TRANSMISSION SYSTEMS TERMINAL EQUI PMENTS DIGITAL NETWORKS SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION General aspects Design objectives for digital networks Quality and avai
5、lability targets Network capabilities and functions DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.100-G.199 G.200-G.299 G ,300-G . 399 G.400-G.449 G ,700-G . 799 G .800-G . 899 G. 800-G . 809 G.81 O-G .819 G. 820-G. 829 G. 830-G. 839 G.840-G.899 G ,900-G . 999 For further details, please refer to ITU-T
6、 List of Recommendations. ITU-T RECOMMENDATION G.861 PRINCIPLES AND GUIDELINES FOR THE INTEGRATION OF SATELLITE AND RADIO SYSTEMS IN SDH TRANSPORT NETWORKS Summary This Recommendation provides guidelines and principles for the integration of digital radio-relay and satellite systems into SDH based t
7、ransport networks. It focuses on the functional and architectural aspects of the integration from a network perspective, with the objective of ensuring compatibility in terms of the information transfer capability of SDH signal elements and inter-system management commonality. It does not consider t
8、he internal composition, or implementation specific details of digital radio-relay and satellite systems, which are the subject of the relevant ITU-R Recommendations. Source ITU-T Recommendation G.861 was prepared by ITU-T Study Group 13 (1993-1996) and was approved under the WTSC Resolution No. 1 p
9、rocedure on the 27th of August 1996. STD-ITU-T RECMN G-bl-ENGL L97b I 4b2591 b32485 3T4 FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecornmunication Standardization Sector (ITU-T) is a permanent organ of
10、the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes
11、the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-Ts p
12、urview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU dra
13、ws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU membe
14、rs or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU had/had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this
15、 may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 1997 Ail rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, withou
16、t permission in writing from the ITU. 11 Recommendation G.861 (08/96) STD-ITU-T RECMN G-661-ENGL 177b W 4b2.571 Ob3248b 230 D 1 1.1 1.2 1.3 1.4 1.5 2 2.1 2.2 2.3 3 3.1 3.2 3.3 4 4.1 4.2 4.3 4.4 5 5.1 5.2 5.3 5.4 5.5 CONTENTS Introduction Scope Structure of this Recommendation . References Definition
17、s Abbreviations . Scenarios for radio digital section integration into SDH Architecture description . Architectural principles Digital sections at 5 1.84 Mbitls and other sub-STM-1 bit rates . Satellite system as a wide-area SDH network node . Architecture description . Architectural principles Exam
18、ples of satellite-system based digital cross-connects Wide-area cross-connect with various S-10s rates . Wide-area cross-connect with 5 1.84 Mbitls S-10s . 3.3.1 3.3.2 Guidelines for constructing sub-STM- 1 multiplex structures and radio section General SDH multiplex conversion . Functions of radio
19、section overhead (SOH) . layers . Media specific equipment interfaces (REI, SEI) SDH management aspects . - . General requirements NE layer management facilities Bandwidth efficiency Network layer management principles . . Management communications and interfaces . Page 1 1 1 1 2 3 7 7 9 9 9 11 11 1
20、1 11 11 13 13 13 14 14 15 15 Recommendation G.861 (08/96) . 111 Recommendation G.861 PRINCIPLES AND GUIDELINES FOR THE INTEGRATION OF SATELLITE AND RADIO SYSTEMS IN SDH TRANSPORT NETWORKS (Geneva, 1996) 1 Introduction 1.1 Scope This Recommendation provides guidelines and principles for integrating d
21、igital radio-relay and satellite systems and equipment in SDH transport networks. It focuses on functional and architectural aspects of the integration from a G.803 network perspective. The objective is to ensure compatibility in terms of information transfer capability of SDH signal elements and in
22、ter-system management commonality. A number of integration scenarios of radiokatellite systems with different roles and functions in the SDH transport network are described. They vary in transparency to G.707 synchronous transport module signals, or their payload (VCs) signals between the radio syst
23、em interfaces. This Recommendation addresses management aspects, including provision of and access requirements to SDH management facilities for radio and satellite systems in the G.784 SDH management subnetworks (SMS). This Recommendation does not consider the internal composition, make-up and impl
24、ementation specific details of the satellite and radio systems, which are the subject of pertinent ITU-R Recommendations. 1.2 Structure of this Recommendation Clause 2 describes scenarios and architectural principles for the integration of radio systems as point- to-point digital sections in SDH. Cl
25、ause 3 describes a scenario for satellite systems emulating synchronous Network Element (NE) functions at SDH network nodes, and utilizes the satellite unique capability of supporting multipoint configurations to client connections of SDH elemental signalts) (VCs or TUS). Clause 4 provides guideline
26、s for constructing sub-STM- 1 signal multiplex structures, new degenerate HOVC and direct mapping of LOVCs in sub-STM-1 radio sections. Clause 5 addresses SDH management aspects to be taken into account in multiple transmission media SDH systems. 1.3 References The following ITU-T Recommendations an
27、d other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; all users of this Recommendation are therefore e
28、ncouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. - ITU-R Recommendation F.750-2 (1 993, Architectures und functional aspects of vadio-rela
29、y systems for SDH-bused networks. Recommendation G.861 (08196) 1 STD-ITU-T RECMN G-BbZ-ENGL L77b 48b257L Ob32488 003 D ITU-R Recommendation F.75 1-1 (1 994), Transmission characteristics and performance requirements of radio-relay systems for SDH-based networks. CCITT Recommendation G.703 (1 991), P
30、hysical/electrical characteristics of hierarchical digital interfaces. ITU-T Recommendation G.707 (1 996), Network node interface for the Synchronous Digital Hierarchy (SOH). ITU-T Recommendation G.774 (1 996), Synchronous Digital Hierarcy (SOH) management information model for the network element v
31、iew. ITU-T Recommendation G.774.1 (1 996), Synchronous Digital Hierarchy (SOH) performance monitoring for the network element view. ITU-T Recommendation G.774.2 (1 996), Synchronous Digital Hierarchy (SOH) configuration of the payload structure for the network element view. ITU-T Recommendation G.77
32、4.3 (1 996), Synchronous Digital Hierarchy (SDH) management of multiplex-section protection for the network element view. ITU-T Recommendation G.774.4 (1 996), Synchronous Digital Hierarchy (SOH) management of subnetwork connection protection for the network element view. ITU-T Recommendation G.784
33、(1 994), Synchronous Digital Hierarchy management. ITU-T Recommendation G.803 (1 993), Architectures of transport networks based on the Synchronous Digital Hierarchy (SOH). ITU-T Recommendation G.83 1 (1 996), Management capabilities of transport networks based on the Synchronous Digital Hierarchy (
34、SOH). ITU-T Recommendation G.832 (1995), Transport of SDH elements on PDH networks - Frame and multiplexing structures. CCITT Recommendation M. 1520 (1 992), Standardized information exchange between Administrations. ITU-T Recommendation M.30 1 O (1 996), Principles for a telecommunications manageme
35、nt network. ITU-T Recommendation M.3020 (1 999, TMN interface speczjkation methodology. CCITT Recommendation M.3300 (i 992), TMN management capabilities presented at the F interface. CCITT Recommendation X.722 (1 992), Information technology - Open Systems Interconnection - Structure of management i
36、nformation: Guidelines for the definition of managed objects. ITU-R Recommendation S. 1 149 (1 997), Network architecture and equipment functional aspects of digital satellite systems in the FSS formingpart of SDH transport networks. 1.4 Definitions This Recommendation defines the following terms. 1
37、.4.1 line termination (LT): Access to both standard MSOH and RSOH. 1.4.2 multiplex section (MS): Access to standard RSOH and MSOH. 1.4.3 network node interface (“I): The basic, fully standardized open interface in the SDH. The NNI is a physical interface and can be associated with an Intra-Office Se
38、ction (IOS), which is 2 Recommendation G.861 (08/96) STD*ITU-T RECMN G.8bL-ENGL 277b Li862572 Ob32487 T4T broadly equivalent to the existing G.703 interfaces. The basic description of the NNI is given in Figure 3 -i /G .7 07. 1.4.4 network node reference point (“RP): A reference point between the te
39、rmination of an MS and an HOVC connection function, or between two directly connected MSs. The NNRP may or may not have an associated “I. 1.4.5 optical line interface (OLI): An interconnection between optical line system regenerators and between optical line terminals and optical regenerators. 1.4.6
40、 optical line termination (OLT): Access to both standard MSOH and RSOH. 1.4.7 radio-relay air interface (RRAI): An air interface between two radio terminals. 1.4.8 radio-relay equipment interface (RREI): An open interface between elements of the radio- relay system, which may either be electrical or
41、 optical. 1.4.9 radio-relay line termination (RRLT): A radio-relay line termination which may perform non-hierarchical MS signal generation (e.g. STM-N/S 1.84 Mbit/s conversion, G.832 SDH/PDH interworking equipment). Media specific additional section overhead functions may be defined across the asso
42、ciated RRRP or RREI. 1.4.10 radio-relay reference point (RRRP): The radio-relay equivalent of the NNRP, but internally defined between the radio-relay system equipment. The associated bit rate may be at 1.4.11 satellite air interface (SAI): An air interface between two satellite earth stations, and/
43、or between the earth station and the satellite. 1.4.12 satellite equipment interface (SEI): An interface between elements of the satellite system, which may either be electrical or optical. The topology may be asymmetrical. NOTE - SEI may or may not be an open interface. 1.4.13 satellite line termin
44、ation (SLT): A satellite line termination which may perform non-hierarchical S-10s signal generation (e.g. STM-N/S 1.84 Mbit/s conversion, G.832 SDH/PDH interworking equipment), and reconciliation of internal section and path asymmetric connection topologies. Media specific section overhead function
45、s may be defined across the associated SRP or SEI. 1.4.14 satellite reference point (SRP): The satellite equivalent of the NNW, but internally defined between the satellite earth station equipment. The associated bit rate may be at sub-STM-l. The topology may be asymmetrical. 1.4.15 satellite regene
46、rator terminal (SRT): Terminal which broadly covers satellite modem and multiple access equipment. sub-STM-l . 1.5 Abbreviations This Recommendation uses the following abbreviations. DCC Data Communication Channel DXC Digital Cross Connect EI Equipment Interface HOVC Higher Order Virtual Container 1
47、0s Intra-Office Section LOVC Lower Order Virtual Container Recommendation G.861 (08/96) 3 STD-ITU-T RECMN G-BbL-ENGL L97b E +Ab2571 Ob3270 7bL W LT MS MSOH “I “W OLI OLT OR RRA1 RREI RRLT RRRP RRRT RS RSOH SAI SDH SEI s-10s SLT SOH SRP SRT SSTM-ij STM-N TMN Line Termination Multiplex Section Multipl
48、ex Section Overhead Network Node Interface Network Node Reference Point Optical Line Interface Optical Line Termination Optical Regenerator Radio-Relay Air Interface Radio-Relay Equipment Interface Radio-Relay Line Temination Radio-Relay reference Point Radio-Relay Regenerator Terminal Regenerator S
49、ection Regenerator Section Overhead Satellite Air Interface Synchronous Digital Hierarchy Satellite Equipment Interface Satellite Intra-Office Section Satellite Line Termination Section Overhead Satellite Reference Point Satellite Regenerator Terminal Satellite Synchronous Transport Module level-ij Synchronous Transport Module level-N Telecommunications Management Network 2 Scenarios for radio digital section integration into SDH 2.1 Architecture description Integration scenarios of radio systems as digital sections between two SDH network nodes are illustrated in Figure 1. An MS
