1、k U RO PEAN 1 ELECOMMUNICATION STANDARD ETS 300 233 May 1994 Source: ETSI TC-TM Reference: DETTM-03003 UDC: 621.395 Key words: Transmission, multiplexing, ISDN Integrated Services Digital Network (ISDN); Access digital section for ISDN primary rate ETSI European Telecommunications Standards Institut
2、e ETSI Secretariat Postal address: 06921 Sophia Antipolis Cedex - FRANCE Office address: Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE Tel.: + 33 92 94 42 O0 - Fax: + 33 93 65 47 16 0 European Telecommunications Standards Institute 1 994. All rights reserved. No part may be reproduced ex
3、cept as authorised by written permission. The copyright and the foregoing restriction on reproduction extend to all media in which the information may be embodied. STDmETSI ETS 3UO 233-ENGL 1494 3408855 0182994 813 Page 2 ETS 300 233: 1994 Whilst every care has been taken in the Preparation and publ
4、ication of this document, errors in content, typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to “ETSI Editing and Standards Approval Dept.“ at the address shown on the title page. STD-ETSI ETS 300 233-ENGL 1774 34Q0855 0382715 75T Page 3 ETS 300 233:
5、 1994 Contents Foreword . 5 1 2 3 4 5 6 7 8 9 Scope 7 Normative references 7 Definitions and abbreviations 8 3.1 Definitions . 8 3.2 Abbreviations 8 Configuration and application . 9 4.1 Configuration . 9 4.2 Application . 11 4.3 Modelling and relationship between the access digital section and the
6、ET . 11 Functions . 13 5.1 B-channel 13 5.2 HO-channel 13 5.3 H1 -channel 13 5.4 D-channel . 13 5.5 Bit timing 14 5.6 Octet timing 14 5.7 Frame alignment 14 5.8 CRC-4 procedure 14 5.9 M-channel . 14 5.10 Power feeding . 14 5.1 1 Operation and maintenance of the access digital section 14 Signal trans
7、fer delay 14 Jitter . 15 7.1 Output/input jitter at T reference point 15 7.2 Jitter at the V3 reference point 15 Operation and maintenance 15 8.1 Control facilities . 15 8.1.1 Loopbacks 15 8.1.1.1 Loopback implementation 15 8.1.1.2 Loopback procedure . 15 8.2 Monitoring 15 8.2.1 Functions . 15 8.2.2
8、 Defect conditions and consequent actions 16 8.2.2.1 Detection of defect conditions . 16 8.2.2.2 Definition of defect indication signals 16 8.2.2.3 Detection of defect indication signals 17 8.2.2.4 Definition of detection algorithms . 17 8.2.2.5 Consequent actions 18 Error performance monitoring . 1
9、8 8.3 Operation and maintenance procedures 18 9.1 Partitioning of functions 18 9.2 Definitions of signals at the T reference point . 20 9.3 Definition of signals at the V3 reference point 20 9.4 Definition of ET layer 1 state machine . 24 . STDmETSI ETS 300 233-ENGL 1774 3Y008.55 OLf3277b b9b . Page
10、 4 ETS 300 233:1994 9.5 Definition of DS state machine . 24 9.5.1 DS states . 24 9.5.2 DS state transition table . 24 9.5.2.1 Assumptions 25 9.5.2.2 Classification of DS states . 25 9.5.2.3 Definition of notations . 25 9.5.2.4 NOTE to DS state tables 5a to 5j 56 Annex A (normative): System managemen
11、t requirements 57 A . 1 Introduction 57 A.2 System management requirements 57 A.2.1 General . 57 A.2.2 Error indications . 57 A.2.3 Loopback operations 57 A.2.4 Information to be sent in the D-channel during loopback operation . 57 A.2.5 Configuration control 58 A.3 Handling of CRC error information
12、 in the ET 58 A.4 Definition of ET layer 1 state machine . 58 A.4.1 ET layer 1 states . 58 A.4.2 PH and MPH primitives 58 A.4.2.1 The repertoire of PH and MPH primitives . 58 A.4.2.2 Repertoire of MPH primitives . 58 ET layer 1 state transition table 59 A.4.3.1 Definition of notations 59 A.4.3.2 Cla
13、ssification of ET states . 59 A.4.3 Annex B (normative): Combined ET and LT functions . 74 Annex C (normative): Conformance testing . 74 Annex D (informative): Bibliography -74 Annex E (informative): NT1 functions with 2 048 kbit/s and Option 2 . 75 History 76 Page 5 ETS 300 233: 1994 Foreword This
14、European Telecommunication Standard (ETSI has been produced by the Transmission and Multiplexing (TM) Technical Committee of the European Telecommunications Standards Institute (ETSI). Annexes A to C of this ETS are normative whereas Annexes D and E are informative. NOTE: ITU-T Recommendation G.962
15、11993) is based upon this ETC. - STD-ETSI ETS 300 233-ENGL 277Li M 31100855 OL82798 11b7 . Page 6 ETS 300 233: 1994 Blank page STD-ETSI ETS 300 233-ENGL 1794 W 3400855 0382979 3T5 W Page 7 ETS 300 233:1994 1 Scope This ETS specifies the characteristics of an access digital section for the Integrated
16、 Services Digital Network (ISDN) primary rate access between the user-network interface (at the T reference point, defined in ETS 300 O1 1 11I and the local exchange (at the V.3 reference point, defined in CCITT Recommendation 0.51 2 411 supporting the primary rate interface channel structure define
17、d in CCITT Recommendation 1.41 2 I31 and ETS 300 O1 1 I 1 and the additional functions required for operation and maintenance of the access digital section according to ETR O01 121, Option 2. NOTE: ITU-T Recommendation G.962 (1993) is based upon this ETS. The requirements of this ETS satisfy network
18、 performance requirements of CCIlT Recommendations G.821 i51 on error performance as well as CCITT Recommendations G.801 and 1.350 with regard to availability. Annex A (normative) to this ETS specifies requirements for interworking between the Primary Rate Access Digital Section (DS) and the Exchang
19、e Termination (ET) and the definition of the ET layer 1 state machine which are outside the scope of this ETS but which are nevertheless important. Annex B (normative) specifies a modification of the requirements when Line Termination (LT) and ET functions are combined in one unit. Annex C (normativ
20、e), to be provided, will specify the requirements for conformance testing. This ETS does not specify the requirements of the digital transmission system used within the access digital section. 2 Normative references This ETS incorporates by dated or undated reference, provisions from other publicati
21、ons. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this ETS only when incorporated in it by amendment or revision. For undated ref
22、erences the latest edition of the publication referred to applies. 11 1 121 t 31 I41 i51 i61 71 81 ETC 300 O1 1 (1 992): “Integrated Services Digital Network (ISDNI; Primary rate user-network interface; layer 1 specification and test principles“. ETR O01 : “Integrated Services Digital Network (ISDN)
23、; Customer access maintenance“. CCIlT Recommendation 1.41 2 (1 988): “ISDN user-network interfaces - Interface structures and access capabilities“. CCITT Recommendation 0.51 2 (1 988): “Exchange interfaces for subscriber access“. CCITT Recommendation G.82 1 (1 988): “Error performance of an internat
24、ional digital connection forming part of an integrated services digital network“. CCIlT Recommendation G.823 (1 988): “The control of jitter and wander within digital networks which are based on the 2048 kbitls hierarchy“. CCITT Recommendation G.706 (1 988): “Frame alignment and cyclic redundancy ch
25、eck (CRC) procedures relating to basic frame structures defined in Recommendation G.704“. CCIlT Recommendation G.703 (1 988): “Physical/electrical characteristics of hierarchical digital interfaces“. Page 8 ETS 300 233: 1994 91 I1 01 11 11 3 3.1 CCITT Recommendation G.704 (1 988): “Synchronous frame
26、 structures used at primary and secondary hierarchical levels“. CCITT Recommendation Q.940 (1 988): “ISDN user-network interface protocol for management - general aspects“. CCITT Recommendation 1.41 1 (1 988): “ISDN user-network interfaces - Reference configuration“. Definitions and abbreviations De
27、finitions For the purposes of this ETS, unless otherwise indicated, the term TE is used to indicate terminating layer 1 aspects of TE1, TA and NT2 functional groups. When the term TE indicates terminating layer 1 aspects of TE1, then according to figure 2 of CCITT Recommendation 1.41 1 ill, the S an
28、d T reference points coincide. In this ETS references to LT only concern the LT inside the access digital section. 3.2 Abbreviations For the purposes of this ETS, the following abbreviations apply: AIS AUXP CRCQ DS ET Alarm Indication Signal Auxiliary Pattern Cyclic Redundancy Check Primary Rate Acc
29、ess Digital Section Exchange Termination ETS European Telecommunication Standard ETSI FC4 European Telecommunications Standards Institute Failure Condition FE Function Element PS HDLC micro second High Level Data Link Control ISDN Integrated Services Digital Network LFA LOS Loss of Frame Alignment L
30、oss of Signal LT Line Termination NF NOF Normal Frame Normal Operational Frames NT Network Termination PH Packet Handler Page 9 ETS 300 233:1994 RA I Remote Alarm Indication SIG Signal between LT and NT1 TE Terminal Equipment 4 Configuration and application 4.1 Configuration Figure 1 below shows the
31、 boundaries of the access digital section in relation to the digital transmission system definition. The concept of the access digital section is used in order to allow a. functional and procedural description and a definition of the network requirements. The concept of a digital transmission system
32、 is used in order to describe the characteristics of an implementation, using a specific medium, in support of the access digital section. Digital transmission system II reference point reference point Primary Rate Access Digital Section (DS) NOTE 1: From a functional point of view the information t
33、ransferred via the reference points T and V3 are different and, therefore, the digital section is not symmetrical. NOTE 2: Digital transmission system refers to either a line system using metallic media or optical fibres or to a radio system. Figure 1 : Access digital section and transmission system
34、 boundaries - - - STD*ETSI ETS 300 233-ENGL 1994 3400855 0383002 598 D Page 10 ETS 300 233:1994 NT2 - T Primary Rate Access Digital Section (DS) V3 I (NOTE i) I I Line Line LT - -, T Digital access link V3 II VI Access i section (NOTE 1) ET - i- l 4- i Mux 1 I Digital link I G. 921 (NOTE 2) I I (NOT
35、E 3) NOTE 1 : The access digital sections may include one or more regenerators. NOTE 2: Multiple applications of digital links and multiplexors may be possible, but see also subclause 7.2 “Jitter at the V3 reference point“. NOTE 3: In the case of remote access, the digital access link is terminated
36、at the ET by a V3 reference point which is functionally and electrically identical with the V3 reference point in the case of the direct access. NOTE 4: The Line Terminations (LTs) forming part of the first order digital section or the digital link are outside the scope of this ETS. Figure 2: Exampl
37、es of equipment configurations in the ISDN primary rate access - _- - STD-ETSI ETS 300 233-ENGL 3771r 3400855 0383003 429 Page 11 ETS 300 233: 1994 4.2 Application The Primary Rate Access Digital Section (DS) may be applied as given in figure 2 for: - direct access to the local exchange; - remote ac
38、cess via one first order digital section or via higher order multiplex equipment forming a digital access link to the local exchange. 4.3 Modelling and relationship between the access digital section and the ET The general model, as shown in figure 3, depicts the whole ISDN customer access layer 1 a
39、nd adjacent entities. It also provides the basis to describe the functions performed by the access digital section and those performed by TE, ET and system management and how various functions are grouped. In particular, according to this model, the maintenance functions specified in this ETS are no
40、t confined to functions performed by the access digital section but include functions associated with ET layer 1. This model includes primitive procedures between ET layer 1, E3 layer 2 and system management: a) ETS 300 O1 1 1 I and CCIlT Recommendations Q.920/6.921 interactions between ET layer 1 a
41、nd ET layer 2 and system management based on Packet Handler (PH) and MPH primitives, respectively, as defined in ETS 300 O1 1 ll. These interactions are for the support of functions specified in CCIlT Recommendations Q.920 and Q.921; b) interactions between ET layer 1 and system management for the s
42、upport of functions associated with the access digital section, based on MPH primitives. The primitive procedures within TE comply with the specification according to ETS 300 O1 1 1 I. This model does not constrain layer 1 arrangements between LT and NT1, nor the digital transmission system technolo
43、gy. STD-ETSI ETS 300 233-ENGL 1774 Page 12 ETS 300 233: 1994 t t R dC E vj - . I- I I I u) a, .- E ii Y c al o a a n - STD.ETS1 ETS 300 233-ENGL L47q 3400855 0383005 2T7 Page 13 ETS 300 233:1994 5 Functions Figure 4 below shows the functions which shall be supported by the Primary Rate Access Digita
44、l Section. Primary Rate Access T reference point Digital Section V3 reference point B-, HO- or Hi-channels D - channe 1 Bit timing I I i Ictet timing I 1 Frame alignment 1 CRC procedures I I M - channe 1 I Power feeding (NOTE) Operation 1 timeslot at 64 kbit/s (numbered 16) for the transport of a D-
45、channel; 1 timeslot at 64 kbit/s (numbered O) for frame alignment, and to follow the procedures for multiframe alignment, CRC-4 procedures and maintenance. - - 5.1 B-channel This function provides for the bi-directional transmission of up to 30 independent B-channels, each having a bit rate of 64 kb
46、it/s as defined in CCIlT Recommendation 1.41 2 31. 5.2 HO-channel This function provides for the .bi-directional transmission of up to 5 independent HO-channels, each having a bit rate of 384 kbit/s as defined in CCITT Recommendation 1.41 2 31. 5.3 H1 -channel This function provides for the bi-direc
47、tional transmission of one H1 -channel having a bit rate of 1 920 kbit/s as defined in CCIlT Recommendation 1.412 31. 5.4 D-channel This function provides for the bi-directional transmission of one D-channel at a bit rate of 64 kbit/s as defined in CCITT Recommendation 1.41 2 31. Page 14 ETS 300 233
48、:1994 5.5 Bit timing This function provides bit (signal element) timing to enable the TE, the access digital section or the ET to recover information from the aggregate bit stream. 5.6 Octet timing This function provides 8 kHz timing towards to the TE, the access digital section or the ET to enable
49、voice codecs to recover an octet structure and for other timing purposes as required. 5.7 Frame alignment This function provides information to enable the TE, the access digital section or the ET to recover the time-division multiplexed channels. 5.8 CRC4 procedure This function provides protection against false framing and for error performance monitoring of the access digital section. The CRC-4 procedure shall be implemented according to ETR 001 i21, Option 2. This includes the multiframe procedure defined in CCITT Recommend
