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T-REC-I.430-199511-I!!PDF-E.pdf

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INTERNATIONAL TELECOMMUNICATION UNION ITU-T I.430 TELECOMMUNICATION (11/95) STANDARDIZATION SECTOR OF ITU INTEGRATED SERVICES DIGITAL NETWORK (ISDN) ISDN USER-NETWORK INTERFACES BASIC USER-NETWORK INTERFACE LAYER 1 SPECIFICATION ITU-T Recommendation I.430 (Previously “CCITT Recommendation”) FOREWORD The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (ITU). The ITU-T is responsible for study
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  INTERNATIONAL TELECOMMUNICATION UNION    TELECOMMUNICATION (11/95) STANDARDIZATION SECTOROF ITU              Recommendation   (Previously “CCITT Recommendation”)  FOREWORD The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International TelecommunicationUnion (ITU). The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommen-dations on them with a view to standardizing telecommunications on a worldwide basis.The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes thetopics 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 WTSCResolution No. 1 (Helsinki, March 1-12, 1993).ITU-T Recommendation I.430 was revised by ITU-T Study Group 13 (1993-1996) and was approved under the WTSCResolution No. 1 procedure on the 2nd of November 1995.___________________NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunicationadministration and a recognized operating agency. 󰂩  ITU 1996All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic ormechanical, including photocopying and microfilm, without permission in writing from the ITU.  Recommendation I.430 (11/95) i CONTENTS Recommendation I.430 (11/95) Page 1General...........................................................................................................................................................12Service characteristics....................................................................................................................................12.1Services required from the physical medium....................................................................................12.2Service provided to layer 2...............................................................................................................12.2.1Transmission capability....................................................................................................12.2.2Activation/deactivation.....................................................................................................22.2.3D-channel access...............................................................................................................22.2.4Maintenance......................................................................................................................22.2.5Status indication................................................................................................................22.3Primitives between layer 1 and the other entities.............................................................................23Modes of operation........................................................................................................................................33.1Point-to-point operation....................................................................................................................33.2Point-to-multipoint operation...........................................................................................................34Types of wiring configuration........................................................................................................................34.1Point-to-point configuration.............................................................................................................34.2Point-to-multipoint configuration.....................................................................................................34.3Wiring polarity integrity...................................................................................................................34.4Location of the interfaces.................................................................................................................34.5NT and TE associated wiring............................................................................................................45Functional characteristics...............................................................................................................................45.1Interface functions............................................................................................................................45.1.1B-channel..........................................................................................................................45.1.2Bit timing..........................................................................................................................55.1.3Octet timing......................................................................................................................55.1.4Frame alignment...............................................................................................................55.1.5D-channel..........................................................................................................................55.1.6D-channel access procedure..............................................................................................55.1.7Power feeding...................................................................................................................55.1.8Deactivation......................................................................................................................55.1.9Activation..........................................................................................................................55.2Interchange circuits...........................................................................................................................55.3Connected/disconnected indication..................................................................................................55.3.1TEs powered across the interface......................................................................................65.3.2TEs not powered across the interface...............................................................................65.3.3Indication of connection status.........................................................................................65.4Frame structure.................................................................................................................................65.4.1Bit rate............................................................................................................................65.4.2Binary organization of the frame......................................................................................65.5Line code..........................................................................................................................................85.6Timing considerations.......................................................................................................................96Interface procedures.......................................................................................................................................96.1D-channel access procedure.............................................................................................................96.1.1Interframe (layer 2) time fill.............................................................................................96.1.2D-echo channel.................................................................................................................96.1.3D-channel monitoring.......................................................................................................96.1.4Priority mechanism...........................................................................................................96.1.5Collision detection............................................................................................................106.1.6Priority system..................................................................................................................10  ii Recommendation I.430 (11/95) Page 6.2Activation/deactivation.....................................................................................................................106.2.1Definitions.........................................................................................................................106.2.2Signals............................................................................................................................126.2.3Activation/deactivation procedure for TEs.......................................................................136.2.4Activation/deactivation for NTs........................................................................................156.2.5Timer values......................................................................................................................156.2.6Activation times................................................................................................................176.2.7Deactivation times.............................................................................................................176.3Frame alignment procedures.............................................................................................................176.3.1Frame alignment procedure in the direction NT to TE.....................................................176.3.2Frame alignment in the direction TE to NT......................................................................186.3.3Multiframing.....................................................................................................................186.3.4S-channel structuring algorithm........................................................................................206.4Idle channel code on the B-channels................................................................................................207Layer 1 maintenance......................................................................................................................................207.1Provision for operational and maintenace functions between terminal and NT1.............................207.1.1Introduction.......................................................................................................................217.1.2Test loopbacks..................................................................................................................217.1.3Codes, message durations, and detection algorithms for a Q-channel andSC1-subchannel................................................................................................................217.1.4Code priorities for Q-channel and SC1-subchannel..........................................................217.1.5TE-to-NT direction messages (Q bits)..............................................................................217.1.6NT-to-TE direction messages (SC1 bits)..........................................................................237.1.7B-channel loopback indications (LB1I, LB2I, LB1/2I)....................................................247.1.8Loss-of-received-signal indication (LRS).........................................................................247.1.9Disruptive NT Operation Indication (DOI)......................................................................248Electrical characteristics.................................................................................................................................258.1Bit rate..............................................................................................................................................258.1.1Nominal rate......................................................................................................................258.1.2Tolerance...........................................................................................................................258.2Jitter and bit-phase relationship between TE input and output.........................................................258.2.1Test configurations............................................................................................................258.2.2Timing extraction jitter.....................................................................................................278.2.3Total phase deviation input to output................................................................................278.3NT jitter characteristics.....................................................................................................................288.4Termination of the line.....................................................................................................................288.5Transmitter output characteristics.....................................................................................................288.5.1Transmitter output impedance...........................................................................................288.5.2Test load impedance..........................................................................................................298.5.3Pulse shape and amplitude (binary ZERO).......................................................................298.5.4Pulse unbalance.................................................................................................................318.5.5Voltage on other test loads (TE only)...............................................................................318.5.6Unbalance about earth.......................................................................................................318.6Receiver input characteristics...........................................................................................................318.6.1Receiver input impedance.................................................................................................318.6.2 Receiver sensitivity – Noise and distortion immunity......................................................338.6.3NT receiver input delay characteristics.............................................................................368.6.4Unbalance about earth.......................................................................................................378.7Isolation from external voltages.......................................................................................................378.8Interconnecting media characteristics...............................................................................................388.9Standard ISDN basic access TE cord...............................................................................................388.10Longitudinal output voltage..............................................................................................................388.11Electromagnetic compatibility (EMC)..............................................................................................38
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