1、ETSI ETR*OBO b 3400855 0347573 54b -7 1 ECHNICAL ETR 080 November 1996 Second Edition Source: ETSI TC-TM Reference: RTR/TM-06004 ICs: 33.080 Key words: ISDN, transmission, basic, rate, access, local loop, coding Transmission and Multiplexing (TM); Integrated Services Digital Network (ISDN) basic rat
2、e access; Digital transmission system on metallic local lines ETSI European Telecommunications Standards Institute ETSI Secretariat Postai address: F-O6921 Sophia Antipolis CEDEX - FRANCE Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE X.400: c=fr, a=atlas, p=etsi, s=se
3、cretarat - Internet: secretariat Qetsi.fr Tel.: +33 4 92 94 42 O0 - Fax: +33 4 93 65 47 16 Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. O European Telecornmunications Sta
4、ndards Institute 1996. All rights reserved. Page 2 ETSI ETR*OBO 96 3400855 0347572 482 ETR 080: November 1996 Whilst every care has been taken in the preparation and publication of this document, errors in content, typographical or otherwise, may occur. If you have comments concerning its accuracy,
5、please write to “ETSI Editing and Committee Support Dept.“ at the address shown on the title page. ETSI ETR*OBO 96 m 3400855 0347573 319 m Page 3 ETR 080: November 1996 Contents Foreword . 9 1 2 3 4 5 6 7 8 Scope 11 1.1 Objectives 12 References 12 Abbreviations . 13 Functions . 14 4.1 B-channel . 14
6、 4.2 Dchannel . 14 4.3 Bit timing 14 4.5 Frame alignment 14 Activation from LT or NT1 15 4.7 Deactivation . 15 4.8 Power feeding 15 4.4 Octet timing 14 4.6 4.9 Operations and maintenance . 15 Transmission medium . 16 5.2 Minimum ISDN requirements . 16 5.3 5.4 DLL characteristics 17 5.4.1 Principal c
7、haracteristics . 17 5.4.2 Crosstalk . 17 5.4.3 5.4.4 Impulse noise 18 5.4.5 Micro interruptions . 18 5.1 Description . 16 DLL physical characteristics 16 Unbalance about earth 18 System performance . 18 6.1 Performance requirements 18 System performance with Regenerators (REGS) 19 6.2 Performance me
8、asurements . 19 DLL physical models . 19 6.2.2 Intrasystem crosstalk 22 Impulse noise modelling 22 6.2.3.1 Types of impulsive noise . 22 6.2.3.2 Measurement arrangement . 23 Performance tests . 24 6.2.4.1 TEST 1 24 Micro interruption test 25 Longitudinal conversion loss . 25 6.1.1 6.2.1 6.2.3 6.2.4.
9、2 TEST 2 24 6.2.4.3 TEST 3 25 6.2.5 Unbalance about earth . 25 6.3.1 6.3.2 Longitudinal output voltage 26 6.3 6.2.4 Transmission method 27 Activation/deactivation . 28 8.1 General 28 8.2 Physical representation of signals . 28 9 Operation and maintenance 28 ETSI ETR*O80 96 3400855 OLY7574 255 Page 4
10、 ETR 080: November 1996 9.1 9.2 CL channel 28 CL channel definition 28 CL channel requirements 28 Operation and maintenance functions 28 9.2.1 9.2.2 9.3 Metallic loop testing . 29 10 Power feeding . 29 10.1 10.2 10.3 10.4 10.5 10.6 10.7 10.8 . General 29 Power feeding functions 29 10.2.1 Power feedi
11、ng of the REG 29 10.2.2 10.2.3 Power feeding of the user network interface 29 DLL resistance 29 LT aspects . 30 10.5.1 Feeding voltage from the LT . 30 10.5.2 Dynamic power feeding requirements 30 10.5.3 LT requirements for the reset of NT1 and REG . 31 Power requirements of NT1 and regenerator 31 1
12、0.6.1 10.6.1.1 Static requirements . 31 Power requirement of regenerator 33 10.6.2.1 Static requirements . 33 10.6.2.2 Dynamic requirements 33 10.6.3 Feeding voltage to the NT1 34 10.6.4 Voltage drop across the REG . 34 10.6.5 Reset of NT1 and REG . 34 Current transient limitation 34 DC and low freq
13、uency AC termination of NT1 and REG 34 Power feeding of the NTl . 29 Wetting current 29 Power requirements of NT1 31 10.6.1.2 Dynamic requirements 31 10.6.2 11 Environmental conditions 35 1 1.1 Climatic conditions 35 11.2 Safety 35 11.4 EMC 35 Definition of a system using 2B1Q line code 36 11.3 Over
14、voltage protection 35 Annex A: A . 1 A.2 A.3 A.4 A.5 A.6 A.7 A.O Line code 36 Line baud rate . 36 A.2.1 NT1 clock tolerance 36 A.2.2 LT clock tolerance . 36 A.2.3 REG clock tolerance . 36 Frame structure 36 A.3.1 Frame length . 36 A.3.2 Bit allocation in direction LT to NT1 . 36 A.3.3 Bit allocation
15、 in direction NT1 to LT . 37 Frame word . 38 A.4.1 Frame word in direction LT to NT1 . 38 Frame alignment procedure . 38 Multiframe . 38 A.6.1 Multiframe word in direction NT1 to LT . 39 A.6.2 Multiframe word in direction LT to NT1 . 39 Frame offset between LT to NT1 and NT1 to LT frames . 39 CL cha
16、nnel 39 A.8.1 A.8.2 A.8.3 ETSI ETR*OBO 96 3400855 0347575 193 Page 5 ETR 080: November 1996 Bit rate 39 Structure 39 Protocol and procedures 39 A.8.3.1 Error monitoring function . 41 A.8.3.1.1 Cyclic redundancy check . 41 A.8.3.1.2 CRC algorithms . 41 A.8.3.1.3 Bits covered by the CRC . 43 Other CL
17、channel functions . 43 A.8.3.2.1 Far end block error bit, mandatory 43 A.8.3.2.2 The ACT bit, mandatory 43 A.8.3.2.3 The DEA bit, mandatory 43 A.8.3.2.4 NTI power status bits 43 A.8.3.2.5 NT1 Test Mode (NTM) indicator bit . 43 .a.3.2.6 Cold-Start-Only (CSO) bit 43 .a.3.2.7 DLL-Only-Activation (UOA)
18、bit . 43 .a.3.2.8 S/T- I nte rface- Activity - I nd icator (SAI) bit 44 A.8.3.2.9 Alarm Indicator Bit (AIB) 44 A.8.3.2.10 Network Indicator Bit (NIB) for network use 44 A.8.3.2.11 Reserved bits . 44 Embedded Operations Channel (EOC) functions . 44 A.8.3.3.1 EOC frame . 44 A.8.3.3.2 Mode of operation
19、 44 A.8.3.3.3 Addressing . 45 A.8.3.3.4 Definition of required EOC functions . 45 A.8.3.3.5 Codes for required EOC functions . 46 A.8.3.2 A.8.3.3 A.9 Scrambling 47 A.l O Start-uP and control . 49 A.10.1 A.10.2 A.10.3 A.10.4 A.10.5 A.10.6 Signals used for start-up and control . 50 Signals during star
20、t-up 50 A.10.1.3 Start-up sequence . 51 A.10.1.5.1 Start-up 52 A.10.1.5.2 Deactivation . 52 Timers 52 A.10.1.1 A.10.1.2 Line rate during start-up 51 A.10.1.4 Wake-up 51 A.10.1.5 Progress indicators 52 Description of the start-up procedure 53 A.10.3.1 Start-up from customer equipment . 53 A.10.3.2 St
21、art-up from the network 53 A.10.3.3 Sequence charts . 53 A.10.3.4 Transparency 56 State transition table for the LT 57 Activation times 65 State transition table for the NT1 . 57 A.11 Jitter . 65 A.11.1 A.11.2 A.11.3 A.11.4 A.11.5 A.11.6 NT1 input signal jitter tolerance . 66 NT1 output jitter limit
22、ations 66 LT input signal jitter tolerance 67 LT output jitter and synchronization . 67 REG jitter tolerance and output jitter limitations . 67 Test conditions for jitter measurements . 67 A.12 Transmitter output characteristics of NT1. REG and LT . 67 A.12.1 Pulse amplitude . 67 A.12.3 Signal power
23、 68 A.12.5 Transmitter linearity . 69 A.12.5.1 Requirements 69 Linearity test method . 69 A.12.2 Pulse shape . 67 A.12.4 Power spectral density . 69 A.12.5.2 ETSI ETR*O8O 96 3400855 OL4757b 028 Page 6 ETR 080: November 1996 A.13 Transmittedreceiver termination . 71 A.13.1 Impedance 71 Return loss 1
24、. 71 Unbalance about earth 72 Longitudinal conversion loss . 72 Appendix I (to Annex A): Extension functions of the system using 2B1Q line code . 73 A.13.2 A.13.3 A.13.3.1 1-1 Introduction . 73 1-2 NT1 Power status bits . 73 1-3 NTM bit . 74 1-4 CSO bit . 74 1-5 UOA bit . 74 1-6 SAI bit . 74 1-7 AIB
25、 74 Appendix II (to Annex A): Discussion of EOC addressing . 83 11-1 Addresses I through 6 (intermediate elements) . 83 11-2 Action of intermediate elements . 83 11-3 Action of NT 84 11-4 Summary 84 Annex B: Definition of a system using Modified Monitoring State (MMS) 43 line code 86 B.l 8.2 6.3 8.4
26、 B.5 B.6 8.7 6.8 8.9 Line code 86 Symbol rate . 86 8.2.1 Clock symbol requirements . 86 B.2.1.1 B.2.1.2 LT clock tolerance 86 NT1 free running clock accuracy 86 Frame structure 86 B.3.2 Symbol allocation LT to NT1 . 87 8.3.3 8.3.1 Frame length . 86 Symbol allocation NT1 to LT . 87 Frame word . 87 Fr
27、ame word in direction LT to NT1 87 Frame word in direction NT1 to LT 87 8.4.1 B.4.2 Frame alignment procedure . 87 Multiframe . 87 Frame offset at NT1 87 CL channel 88 B.8.1 Bit rate . 88 8.8.2 Structure 88 8.8.3 Protocols and procedures . 88 Scrambling 89 ETSI ETR*OBO 96 3400855 0147577 Tb4 Page 7
28、ETR 080: November 1996 B.l O Activation/deactivation . 89 B.10.1 Signals used for activation . 89 B.10.2 Definition of internal timers 90 B.10.3 Description of the activation procedure . 91 B.10.4 NT1 state transition table . 93 B.10.5 LT state transition table 95 B.10.6 Activation times 96 B.ll Jit
29、ter . 96 Limits of maximum tolerable input jitter . 96 B.11.1 B.11.2 B.11.3 B.11.4 Output jitter of NT1 in absence of input jitter . 97 Timing extraction jitter 97 Test conditions for jitter measurements . 97 B.12 Transmitter output characteristics . 97 8.12.1 Pulse amplitude . 97 B.12.2 Pulse shape
30、 . 97 8.12.3 Signal power 98 B.12.4 Power spectrum 99 Transmitter signal non-linearity 99 B.12.5 B.13 Transmitterheceiver termination . 99 B.13.1 Impedance . 99 B.13.2 Return loss 100 B.13.3 Longitudinal conversion loss 100 Appendix III (to Annex B): Extension functions and requirements for a line s
31、ystem with MMS43 line code 101 Annex C: Detailed test cable characteristics . 102 c . 1 Parameters for test cables 102 C.l.l Parameters of O. 4 mm PE cable 102 C.1.2 Parameters of O. 5 mm PE cable 103 C.1.3 Parameters of O. 6 mm PE cable 104 C.1.4 Parameters of O. 8 mm PE cable 105 C.1.5 Parameters
32、of O. 32 mm PVC cable . 106 C.1.6 Parameters of O. 4 mm PVC cable . 107 C.1.7 Parameters of O. 63 mm PVC cable . 108 C.2 Impedance plot of test loops . 109 C.2.1 C.2.2 C.2.3 Impedance plot at 10 kHz 109 Impedance plot at 20 kHz 110 Impedance plot at 40 kHz 111 C.3 Frequency response of test loops .
33、112 C.3.1 C.3.2 C.3.3 C.3.4 C.3.5 C.3.6 C.3.7 Frequency response of loop 2 . 112 Frequency response of loop 3 . 112 Frequency response of loop 4 . 113 Frequency response of loop 5 . 113 Frequency response of loop 6 . 114 Frequency response of loop 7 . 114 Frequency response of loop 8 . 115 History 1
34、16 ETSI ETR*OBO 96 3400855 0347578 TO D Page 8 ETR 080: November 1996 Blank page ETSI ETRUOBO 96 D 3400855 0347579 837 Page 9 ETR 080: November 1996 Foreword This ETSI Technical Report (ETR) has been produced by the Transmission and Multiplexing (TM) Technical Committee of the European Telecommunica
35、tions Standards Institute (ETSI). ETSI Technical Reports (ETRs) are informative documents resulting from ETSI studies which are not appropriate for European Telecommunication Standard (ETC) or Interim European Telecommunication Standard (LETS) status. An ETR may be used to publish material which is
36、either of an informative nature, relating to the use or application of ETSs or I-ETSs, or which is immature and not yet suitable for formal adoption as an ETS or LETS. ETSI ETR*O8O 96 W 3400855 0347580 559 = Page 10 ETR OSO: November 1996 Blank page ETSI ETR*OO 96 D 3400855 0147581 495 Page 11 ETR 0
37、80: November 1996 1 Scope This ETSI Technical Report (ETR) covers the characteristics and parameters of a digital transmission system at the network side of the NT1 to form part of the access digital section for the Integrated Services Digital Network (ISDN) basic rate access using echo cancellation
38、 method. It is based on CCITT Recommendation G.961 l. The system shall support: full duplex; and bit sequence independent, transmission of two B-channels and one D-channel as defined in CCITT Recommendation 1.412 2 and the supplementary functions of the access digital section defined in ETR O01 3. T
39、he terminology used in this ETR is very specific and not contained in the relevant terminology Recommendations. Therefore, annex B to CCITT Recommendation G.960 4 provides a number of terms and definitions used in this ETR. Figure 1 shows the boundaries of the digital transmission system in relation
40、 to the access digital section. Access digital section - 1 T NOTE: In this ETR, digital transmission system refers to a line system using metallic local lines. The use of one intermediate regenerator (REG) may be required. Figure 1 : Access digital section and transmission system boundaries The conc
41、ept of the access digital section is used in order to allow a functional and procedural description and a definition of the network requirements. NOTE: The reference points T and V, are not identical and therefore the access digital section is not symmetric. The concept of a digital transmission sys
42、tem is used in order to describe the characteristics of an implementation, using a specific medium, in support of the access digital section. ETSI ETR*OBO 96 3400855 0147582 321 = Page 12 ETR 080: November 1996 1.1 Object ives Considering that the access digital section between the local exchange an
43、d the customer is one key element of the successful introduction of ISDN into the network, the following requirements for the specification have been taken into account: - to operate on existing 2-wire unloaded lines, open wires being excluded; - the objective is to achieve 100 % cable fill for ISDN
44、 basic access without pair selection, cable rearrangements or removal of Bridged Taps (BTs); - the objective to be able to extend ISDN basic access provided services to the majority of customers without the use of regenerators. In the remaining few cases, special arrangements may be required; coexis
45、tence in the same cable unit with most of the existing services like telephony and voice band data transmission; - - various national regulations concerning Electro-Magnetic Compatibility (EMC) should be taken into account; - power feeding from the network under normal or restricted modes via the ba
46、sic access shall be provided; - the capability to support maintenance functions shall be provided. 2 References This ETR incorporates by dated and undated reference, provisions from other publications. These references are cited at the appropriate places in the text and the publications are listed h
47、ereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this ETR only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. 41 51 71 ITU-T Recommendation G.961 (1 993): “
48、Digital transmission system on metallic local lines for ISDN basic rate access“. CCIlT Recommendation 1-41 2 (1 988): “ISDN user-network interfaces - Interface structures and access capabilities“. ETR O01 (1 990): “Integrated Services Digital Network (ISDN); Customer access maintenance“. CCIlT Recom
49、mendation G.960 (1 988): “Access digital section for ISDN basic rate access“. CCITT Recommendation G.821 (1 988): “Error performance of an international digital connection forming part of an integrated services digital network“. CCITT Recommendation G.117 (1 996): Transmission aspects of unbalance about earth (definitions and methods)“. ETS 300 297 (1 995): “Integrated Services Digital Network (ISDN); Access digital section for ISDN basic rate“. ETS 300 012 (1992): “Integrated Services Digital Network (ISDN); Basic user- network interface; Layer 1 specificat
