ISO/IEC 21559-1:2022

INTERNATIONAL ISO/IEC
STANDARD 21559-1
First edition
2022-03
Telecommunications and information
exchange between systems — Future
network protocols and mechanisms —
Part 1:
Switching and routing
Télécommunications et échange d'informations entre systèmes —
Futurs protocoles et mécanismes de réseau —
Partie 1: Commutation et routage
Reference number
© ISO/IEC 2022
© ISO/IEC 2022
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© ISO/IEC 2022 – All rights reserved

Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 2
5 FN physical links . 2
5.1 General . 2
5.2 Frame format . 2
5.2.1 Components of a frame . 2
5.2.2 AV packets . 3
5.2.3 IT data stream . 3
5.3 Negotiation packets . 4
5.3.1 Payload format . 4
5.3.2 Information elements . . 4
5.4 Link establishment procedure . 5
5.4.1 General . 5
5.4.2 Transmission of request . 5
5.4.3 Response to incoming Link Request . 6
5.4.4 Response to incoming Link Reject . 6
5.4.5 Response to incoming Link Accept . 6
5.4.6 Errors and unexpected packets . 6
6 Virtual links . 7
6.1 General . 7
6.2 Transmission of Link Request . . 7
6.3 Response to incoming Link Request . 7
6.4 Response to incoming Link Reject . 7
6.5 Response to incoming Link Accept . 7
6.6 Errors, unexpected packets, and termination . . 8
7 Network layer synchronisation . 8
7.1 General . 8
7.2 Alignment of frames within an island . 8
7.3 Alignment of frames within a cloud . 8
7.4 Establishment of sync domains . 9
7.5 Action on link down . 9
7.6 Procedures . 9
7.6.1 Link up . 9
7.6.2 Link down . 10
7.6.3 SyncInfo signalling messages . 10
7.6.4 State information . 11
7.6.5 Downstream messages . 11
7.6.6 Upstream messages . 11
7.6.7 Handover messages .12
7.6.8 Transition to active state .12
8 Network time .12
8.1 General .12
8.2 Signalling messages .13
8.3 Protocols . 14
9 Management of network elements.14
9.1 Message format and protocol . 14
9.2 Status reporting . 16
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© ISO/IEC 2022 – All rights reserved

9.3 Console data . 16
9.4 MIB for call management . 16
Annex A (normative) Links implemented over 1Gb/s Ethernet physical layer .17
Bibliography .22
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© ISO/IEC 2022 – All rights reserved

Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical
activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the
work.
The procedures used to develop this document and those intended for its further maintenance
are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria
needed for the different types of document should be noted. This document was drafted in
accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives or
www.iec.ch/members_experts/refdocs).
Attention is drawn to the possibility that some of the elements of this document may be the subject
of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent
rights. Details of any patent rights identified during the development of the document will be in the
Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC
list of patent declarations received (see patents.iec.ch).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see
www.iso.org/iso/foreword.html. In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 6, Telecommunications and information exchange between systems.
A list of all parts in the ISO/IEC 21559 series can be found on the ISO and IEC websites.
Any feedback or questions on this document should be directed to the user’s national standards
body. A complete listing of these bodies can be found at www.iso.org/members.html and
www.iec.ch/national-committees.
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© ISO/IEC 2022 – All rights reserved

Introduction
ISO/IEC TR 29181-1 describes the definition, general concept, problems and requirements for the
Future Network (FN).
ISO/IEC TR 29181-3 examines the requirements for carrying data over digital networks and identifies
those that are not satisfied by the current Internet. It also note
...