ISO/IEC INTERNATIONAL STANDARD 13871 First edition 1995-12-15 Information technology - Telecommunications and information exchange between systems -- Private telecommunications networks Digital channel aggregation Technologies de I'information -- Telécommunications et échange d'information entre systemes - Réseaux privés de telecommunications - Agregation de canal numerique IEC Reference number ISO/IEC 13871:1995(E) Copyright Intemational Organization for Standardization d by IHS Not for Resale ISO/IEC 13871: 1995(E) Contents page Foreword... Introduction . 1 Scope. 2 Normative References . 3 Definitions. 4 Symbols and Abbreviations 5 Selection of ISO/IEC 13871 or ITU-T H.244 aggregation procedures . 6 Basic Principles . 6.1 Modes of operation. 6.2 Frame Structure.... 6.2.1 Bit Ordering.... 6.2.2 Frame Alignment Word (FAW) . 6.2.3 Frame Count (FC).. 6.2.4 Information Channel (IC). 6.2.5 Cyclic Redundancy Check (CRC)... 6.2.6 Distribution of Overhead Octets.... 6.3 Overall Frame alignment... 6.4 Description of CRC4 procedure... 6.4.1 Computation of the CRC4 bits . 6.4.1.1 Multiplication and division process .... 10 6.4.1.2 Encoding procedure . 6.4.1.3 Decoding procedure 6.4.2 Consequent actions ... 6.4.2.1 Enabling and Disabling the CRC procedures ... 10 ..2 Action on bit E...... 6.4.2.3Monitoring for error performance 7 Description of theInformation Channel 7.1 Information Channel Frame.. 7.1.1 Rate Multiplier and Subrate Multiplier Calculation and Operation... .15 7.2 Information Channel (IC) synchronization.. 19 7.3 Transmission and Recognition of an Information Channel Frame 19 8 Procedure .20 8.1 Call Setup .... ..20 8.1.1 Initial Channel Setup .21 8.1.2 Additional Channel Setup 23 ISO/IEC1995 All rights reserved. Unless otherwise specified, no part of this publication may be photocopying and microfilm, without permission in writing from the publisher. ISO/IEC Copyright Office · Case postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland ii Copyright International Organization for Standardization No reprodu Not for Resale ISO/IEC 13871: 1995(E) ISO/IEC 8.1.3 Delay Equalization. .25 8.1.4 Timeout Conditions.. 25 8.2 Adding Bandwidth to an Existing Call 26 8.2.1 Negotiation (Calling Endpoint Initiated) .26 8.2.2 Negotiation (Answering Endpoint Initiated). 26 8.2.3 Additional Channel Setup .. 27 .28 8.2.4 Timeout Conditions.... 8.3 Deleting Bandwidth from an Existing Call. .28 8.3.1 Calling Endpoint Initiated..... 29 Answering Endpoint Initiated .30 8.3.2 8.3.3 Timeout Conditions . .30 8.4 Collision Resolution. .30 8.5 Call Disconnection. .30 8.5.1 Calling Endpoint Initiated 30 Answering Endpoint Initiated .30 8.5.2 8.5.3 Timeout Conditions .31 8.6 Remote Loopback.... 8.6.1 Timeout Conditions .. 8.7 Error Conditions.. .32 8.7.1 Loss of Channel (Other Than Call Setup). 32 8.7.2 Loss of Delay Equalization ... 33 Transparent Mode Operation .33 9 9.1 Non Aggregating Unit Calling Aggregating Unit.. .33 9.2 Aggregating Unit Calling Non Aggregating Unit.. 34 Annexes A RMULT and SUBMULT Values .. .35 A.1 Bearer Channel Rate (BCR) = 56 kbit/s. .35 A.2 Bearer Channel Rate (BCR)= 64 kbit/s.. B Manufacturer's Identifiers.. .39 C Phone Number Length Extension.. .40 D State Machine Description of Channel Aggregation Control ..41 D.1ReferenceArchitecture ..41 D.2 State Definitions.... D.2.1 DEQ Negotiation Control .42 D.2.2 DEQ MULTIFRAME CONTROL States.. D.. Messages and Events........ 44 D.3.1 Information Channel Messages .45 D.3.2 DEQ Negotiation Control to Cali Controi Messages.. 46 D.3.3 D.4.Timers...... ..53 D.5 State Transition Diagrams. .54 D.5.1 DEQNegotiationControl ..54 D.5.2 DEQ Multiframe Control .. D.6. SDL Diagrams... 59 D.6.1 DEONegotiationControl .60 D.6.2 DEQMultiframeControl .87 ili Copyright International Organization for Standardization ing permitted without license from IHS Not for Resale