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ETR 080 TECHNICAL July 1993 REPORT

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ETR 080 TECHNICAL July 1993 REPORT ETSI ETR 080 TECHNICAL July 1993 REPORT Source: ETSI TC-TM Reference: DTR/TM-03002 ICS: 33.020 Key words: ISDN, transmission Transmission and Multiplexing (TM); Integrated Services Digital Network (ISDN) basic rate access; Digital transmission system on metallic local lines ETSI European Telecommunications Standards Institute ETSI Secretariat Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [email protected] Tel.: +33 92 94 42 00 - Fax: +33 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. New presentation - see History box © European Telecommunications Standards Institute 1993. All rights reserved. Page 2 ETR 080: July 1993 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, please write to "ETSI Editing and Committee Support Dept." at the address shown on the title page. Page 3 ETR 080: July 1993 Contents Foreword .......................................................................................................................................................9 1 Scope ................................................................................................................................................11 1.1 Objectives ..........................................................................................................................12 1.2 References ........................................................................................................................12 1.3 Symbols and abbreviations................................................................................................13 2 Functions...........................................................................................................................................15 2.1 B-channel...........................................................................................................................15 2.2 D-channel...........................................................................................................................15 2.3 Bit timing ............................................................................................................................15 2.4 Octet timing........................................................................................................................15 2.5 Frame alignment................................................................................................................15 2.6 Activation from LT or NT1..................................................................................................15 2.7 Deactivation .......................................................................................................................16 2.8 Power feeding ....................................................................................................................16 2.9 Operations and maintenance.............................................................................................16 3 Transmission medium.......................................................................................................................16 3.1 Description.........................................................................................................................16 3.2 Minimum ISDN requirements.............................................................................................17 3.3 DLL physical characteristics ..............................................................................................17 3.4 DLL characteristics ............................................................................................................18 3.4.1 Principal Characteristics................................................................................18 3.4.2 Crosstalk .......................................................................................................19 3.4.3 Unbalance about earth ..................................................................................19 3.4.4 Impulse noise ................................................................................................19 3.4.5 Micro interruptions.........................................................................................19 4 System performance .........................................................................................................................19 4.1 Performance requirements ................................................................................................19 4.2 Performance measurements .............................................................................................20 4.2.1 DLL physical models .....................................................................................21 4.2.2 Intrasystem crosstalk ....................................................................................23 4.2.3 Impulse noise modelling................................................................................23 4.2.3.1 Types of impulsive noise .....................................................23 4.2.3.2 Measurement arrangement .................................................24 4.2.4 Performance tests .........................................................................................25 4.3 Unbalance about earth.......................................................................................................26 4.3.1 Longitudinal conversion loss .........................................................................26 4.3.2 Longitudinal output voltage............................................................................27 5 Transmission method........................................................................................................................28 6 Activation/deactivation.......................................................................................................................28 6.1 General ..............................................................................................................................28 6.2 Physical representation of signals .....................................................................................28 7 Operation and maintenance..............................................................................................................28 7.1 Operation and maintenance functions ...............................................................................28 7.2 CL channel .........................................................................................................................29 7.2.1 CL channel definition......................................................................................29 7.2.2 CL channel requirements...............................................................................29 7.3 Metallic loop testing ...........................................................................................................29 8 Power feeding ...................................................................................................................................29 Page 4 ETR 080: July 1993 8.1 General.............................................................................................................................. 29 8.2 Power feeding functions.................................................................................................... 29 8.2.1 Power feeding of the REG ............................................................................ 29 8.2.2 Power feeding of the NT1............................................................................. 29 8.2.3 Power feeding of the user network interface ................................................ 29 8.3 DLL resistance .................................................................................................................. 30 8.4 Wetting current.................................................................................................................. 30 8.5 LT aspects......................................................................................................................... 30 8.5.1 Safety............................................................................................................ 30 8.5.2 Feeding voltage from the LT......................................................................... 30 8.6 Power requirements of NT1 and regenerator.................................................................... 30 8.6.1 Power requirements of NT1.......................................................................... 30 8.6.2 Power requirement of regenerator................................................................ 31 8.6.3 Feeding voltage to the NT1 .......................................................................... 31 8.6.4 Voltage drop across the REG....................................................................... 31 8.7 Current transient limitation ................................................................................................ 31 8.8 DC and low frequency AC termination of NT1 and REG .................................................. 31 9 Environmental conditions.................................................................................................................
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