1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU M.1300 (1 Oi97) SERIES M: TMN AND NETWORK MAINTENANCE: INTERNATIONAL TRANSMISSION SYSTEMS, TELEPHONE CIRCUITS, TELEGRAPHY, FACSIMILE AND LEASED CIRCUITS I n tern at ion al data t ra nsm ission systems Mainten
2、ance of international data transmission systems operating in the range 2.4 kbits to 140 Mbits ITU-T Recommendation M. 1300 (Previously CCITT Recommendation) - STD.ITU-T RECMN M-1300-ENGL 1997 I 4862593 Ob42254 867 m ITU-T M-SERIES RECOMMENDATIONS TMN AND NEMIORK MAINTENANCE: INTERNATIONAL TRANSMISSI
3、ON SYSTEMS, TELEPHONE CIRCUITS, TELEGRAPHY, FACSIMILE AND LEASED CIRCUITS Introduction and general principles of maintenance and maintenance organization International transmission systems International telephone circuits Common channel signalling systems International telegraph systems and phototel
4、egraph transmission International leased group and supergroup links International leased circuits Mobile telecommunication systems and services International public telephone network M.10-M.299 M.300-M.559 M. 560-M.759 M ,760-M.799 M. 800-M. 899 M.900-M.999 M. 1000-M.l O99 M.1100-M.1199 M. 1200-M.12
5、99 International data transmission systems Designations and information exchange M. 1400-M. 1 999 International transport network Telecommunications management network Integrated services digital networks Common channel signalling systems M.2000-M.2999 M.3000-M.3599 M.3600-M.3999 M.4000-M.4999 For f
6、urther details, please refer to ITU-T List of Recommendations. STDmITU-T RECMN M-1300-ENGL L997 m 4862571 Ob42255 773 m ITU-T RECOMMENDATION M.1300 MAINTENANCE OF INTERNATIONAL DATA TRANSMISSION SYSTEMS OPERATING IN THE RANGE 2.4 kbit/s TO 140 Mbit/s Summary This Recommendation provides a general de
7、scription of international data transmission systems with a PDH presentation to the renter and of the basic requirements for their effective operation. Source ITU-T Recommendation M.1300 was revised by ITU-T Study Group 4 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the
8、24th of October 1997. Keywords International data transmission links, international data transmission systems, international leased circuits . STD=ITU-T RECMN M.1300-ENGL 1997 I 4b2591 Ob42256 b3T S FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the
9、field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of 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 ba
10、sis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes 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 pr
11、ocedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-Ts purview, 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
12、a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws 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
13、the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the IT had not received notice of intellectual property, protected by paten
14、ts, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 1998 All rights reserved. No part of this publication may be reproduced or uti
15、lized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. 11 Recommendation M.1300 (10/97) 1 2 3 4 5 6 7 8 9 10 11 12 Scope References Terminology and definitions Abbreviations . Operational procedures . Performance
16、 limits General description of international data transmission systems . General description of international data transmission links Timing sources . Control and sub-control stations . Reserve arrangements . Designations . Recommendation M.1300 (10/97) Page 1 1 2 2 3 3 3 9 11 11 11 11 . 111 Recomme
17、ndation M.1300 MAINTENANCE OF INTERNATIONAL DATA TRANSMISSION SYSTEMS OPERATING IN THE RANGE 2.4 kbit/s TO 140 Mbit/s (Published 1984; revised 1988, I992 and 1997) 1 Scope This Recommendation defines international data transmission systems with a PDH presentation to the renter. The international dat
18、a transmission system is transported via an international data transmission link, which may typically be provided on a variety of transmission media using a number of network technologies. 2 References The following ITU-T Recommendations contain provisions which, through reference in this text, cons
19、titute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations are subject to revision; all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations li
20、sted below. A list of the currently valid ITU-T Recommendations is regularly published. CCITT Recommendation G.703 (1 99 i), Physical/electrical characteristics of hierarchical digital interfaces. ITU-T Recommendation G.704 (1 995), Synchronous fiame structures used at 1544, 631 2, 2048, 8448 and 44
21、 736 kbitls hierarchical levels. CCITT Recommendation G.732 (1 988), Characteristics of primary PCM multiplex equipment operating at 2048 kbith. ITU-T Recommendation G.736 (1 993), Characteristics of a synchronous digital multiplex equipment operating at 2048 kbitls. CCITT Recommendation G.75 1 (198
22、8), Digital Multiplex equipments operating at the third order bit rate of 34 368 kbith and the fourth order bit rate of 139 624 kbith and using positive justijkation. CCITT Recommendation G.752 (1 980), Characteristics of digital multiplex equipments based on a second order bit rate of 6312 kbith an
23、d usingpositive justiJication. ITU-T Recommendation G.803 (1997) Architectures of transport networks based on the Synchronous Digital Hierarchy (SDH). ITU-T Recommendation G.8 1 1 (1997), Timing characteristics ofprimary reference clocks. ITU-T Recommendation M.60 (1 993), Maintenance terminology an
24、d definitions. CCITT Recommendation M. 1 O 12 (1 988), Circuit control station for leased and special circuits. CCITT Recommendation M. 1 O 13 (1 9SS), Sub-control station for leased and special circuits . Recommendation M.1300 (10/97) 1 ITU-T Recommendation M. 1340 (1 996), Performance allocations
25、and limits for international data transmission links and systems. ITU-T Recommendation M. 1370 (1 993), Bringing-into-service of international data transmission systems. ITU-T Recommendation M. 1375 (1996), Maintenance of international data transmission system. ITU-T Recommendation M. 13 80 (1 997),
26、 Bringing-into-service of international leased circuits that are supported by international data transmission systems. ITU-T Recommendation M. 13 85 (1 993), Maintenance of international leased circuits that are supported by international data transmission systems. ITU-T Recommendation M. 1400 (1 99
27、7), Designations for international networks. ITU-T Recommendation V. 1 1 (1 996), Electrical characteristicsfor balanced double-current interchange circuits operating at data signalling rates up to I O Mbith. ITU-T Recommendation V.24 (1 996), List of definitions for interchange circuits between Dat
28、a Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) . ITU-T Recommendation V.28 (1 993), Electrical characteristics for unbalanced double- current interchange circuits. CCITT Recommendation X.21 (1 992), Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating
29、 Equipment (DCE) for synchronous operation on public data networks. CCITT Recommendation X.50 (1 988), Fundamental parameters of a multiplexing scheme for the international interface between synchronous data networks. Terminology and definitions Terminologies and definitions relating to this Recomme
30、ndation are provided in Recommendation M.60 9. A data transmission system is a component of a digital transmission network, and is primarily used to support international leased circuits. These circuits can be used for a variety of services, including voice, data, video, etc. 4 Abbreviations This Re
31、commendation uses the following abbreviations. DNI FDM LTP MUX PDH RP TDM TIC 2 Digital Network Interface Frequency Division Multiplexing Link Terminating Point Multiplexing Equipment Plesiochronous Digital Hierarchy Renters Premises Time Division Multiplexing Terminal International Centre Recommend
32、ation M.1300 (10/97) TNC Terminal National Centre 5 Operational procedures Recommendation M. 13 70 131 covers the setting up and bringing-into-service of international data transmission systems. Maintenance issues are covered by Recommendation M.1375 141. The bringing-into-service and maintenance is
33、sues relating to international leased circuits with a digital presentation at renters premises that are supported by international data transmission systems are covered by Recommendations M. 13 80 151 and M. 1385 161, respectively. 6 Performance limits Performance limits applicable to international
34、data transmission systems and links are provided in Recommendation M. 1340 121. 7 An international data transmission system is comprised of an international data transmission link combined with multiplexing equipment at each end and is primarily used for the point-to-point transmission of internatio
35、nal leased circuits (see Figure 1). Typical data rates of interest are: 2.4,4.8, 7.2, 9.6, 14.4, 19.2, 48, 56, 64, N x 64 (N = 2 to 31), 1544, and 2048 kbids, 6, 8, 34, 45 and 140 Mbit/s. A system may be carried as a channel on a higher order system (see Figure 2a). The international data transmissi
36、on link that supports the aggregate transmission from the terminal multiplexing equipment of the international data transmission system will be presented via a digital interface that is referred to as the Link Terminating Point (LTP). Where an international data transmission link incorporates an ana
37、logue transmission path, the associated modems required to derive the digital interface are considered to be part of the link2. In general, an international data transmission link can be divided into sectional components. The international link section is considered to exist between Terminal Interna
38、tional Centres (TICS) and the national link section is considered to exist between a TIC and LTP, where the LTP could be located at numerous points, including Terminal National Centres (TNCs) or renters premise$. Several typical configurations of an international data transmission system are shown i
39、n Figure 3. It should be noted that where an LTP exists at a TIC, no national link section will exist. Exceptionally, an international data transmission system may not be routed via any Network Operators/Service Providers premises. Figure 3 d) shows an international data transmission system routed d
40、irectly between renters premises, e.g. via satellite. An international data transmission system can support circuits with either analogue or digital presentations at the renters premises. Typical uses include data, facsimile, voice, etc. (see Figure 4). General description of international data tran
41、smission systems 1 The term multiplexing equipment, as defined in Recommendation M.60 9, includes digital cross-connect equipment. Certain terminal equipment incorporates modem and multiplex functions and there may consequently be no physical LTP at which testing is possible. A similar situation can
42、 exist where a channel card in a primary multiplex equipment operates as a lower order multiplexing equipment in its own right (e.g. in accordance with Recommendation X.50 22). Where a physical LTP does not exist, Network Operators/Service Providers should bilaterally develop alternative testing arr
43、angements. 3 The renters premises is a geographical location which is outside the Administrations domain. Recommendation M.1300 (10/97) 3 For data transmission systems operating within an aggregate data rate, it is recommended that the multiplexing equipment used should conform to Table 1. Alternati
44、ve f-ame structures may be used by bilateral agreement. M U x National International Nat ional section link link section section 4 b4 w4 M link 4 3 n n LTP TIC TIC LTP x International data transmission link 4 Figure 1M.1300 - An international data transmission system International data transmission
45、system 4 F TO40252081 4 Recommendation M.1300 (10/97) STD-ITU-T RECflN fl=L300-ENGL 1997 I iIBb2.591 Ob42262 933 I International data transmission link (64 kbit/s) TNC International data transmission system (2048 kbit/s) 4 ir -M -u3 - Cu- - x LTP -M Intemational data M- LTP x RP- -u transmission lin
46、k u- -u3 Cu- = x LTP -M = 3LTP (2048 kbit/s) LTF x - - LTP x TIC TIC 64 kbit/s channel M- - - RP M- - I I I I Adaption function Termination function International data transmission link (2048 kbit/s) TO407300-97 D - Jnputoutput TIC Terminal International Centre TNC Terminal National Centre RP Renter
47、s Premises LTP Link Terminating Point .MUX Multiplexing Equipment (or Cross-connect system) Figure 2aM.1300 - A typical international data transmission system carried on a higher order system, comprising Multiplex equipment Recommendation M.1300 (10/97) 5 STD-ITU-T RECMN N.1300-ENGL 1997 4862571 Ob4
48、22b3 87T RP c-+J-x* 34 14 TIC DXC RP wxw TIC DXC 4 4 International data transmission system 5 E E 2 Mbitic _-_- -Adaption function - Termination function D - inputoutput TO40731 0-97 0 - Connection function RP Renters Premises DXC Digital Cross-Connect Figure 2bM.1300 - A typical international data
49、transmission system carried on a higher order system, comprising cross-connect equipment Figure 2b above shows the case where the terminal multiplexing equipment is replaced with digital cross-connect equipment. In this case the international data transmission system exists between the mid-points of the two cross-connects. It is therefore possible to define a “virtual point“ at the centre of the cross-connect equipment, fiom where the testing of the international data transmission system is c
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