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International Telecommunication Union

ITU-T

G.798

TELECOMMUNICATION

STANDARDIZATION SECTOR

OF ITU

(12/2006)

SERIES G: TRANSMISSION SYSTEMS AND MEDIA,

DIGITAL SYSTEMS AND NETWORKS

Digital terminal equipments – Other terminal equipment

Characteristics of optical transport network

hierarchy equipment functional blocks

ITU-T Recommendation G.798

ii ITU-T Rec. G.798 (12/2006)

FOREWORD

The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of

telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of

ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing

Recommendations on them with a view to standardizing telecommunications on a worldwide basis.

The World Telecommunication Standardization Assembly (WTSA), which meets every four years,

establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on

these topics.

The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1.

In some areas of information technology which fall within ITU-T's purview, the necessary standards are

prepared on a collaborative basis with ISO and IEC.

NOTE

In this Recommendation, the expression "Administration" is used for conciseness to indicate both a

telecommunication administration and a recognized operating agency.

Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain

mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the

Recommendation is achieved when all of these mandatory provisions are met. The words "shall" or some

other obligatory language such as "must" and the negative equivalents are used to express requirements. The

use of such words does not suggest that compliance with the Recommendation is required of any party.

INTELLECTUAL PROPERTY RIGHTS

ITU draws attention to the possibility that the practice or implementation of this Recommendation may

involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence,

validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others

outside of the Recommendation development process.

As of the date of approval of this Recommendation, ITU had received notice of intellectual property,

protected by patents, which may be required to implement this Recommendation. However, implementers

are cautioned that this may not represent the latest information and are therefore strongly urged to consult the

TSB patent database at http://www.itu.int/ITU-T/ipr/

prior written permission of ITU.

ITU-T Rec. G.798 (12/2006) iii

CONTENTS

Page

1 Scope ............................................................................................................................ 1

2 References..................................................................................................................... 3

3 Definitions .................................................................................................................... 5

3.1 Terms defined elsewhere................................................................................ 5

3.2 Terms defined in this Recommendation......................................................... 7

4 Abbreviations and acronyms ........................................................................................ 8

5 Methodology................................................................................................................. 14

6 Supervision ................................................................................................................... 14

6.1 Alarm reporting control.................................................................................. 14

6.2 Defects............................................................................................................ 14

6.3 Consequent actions......................................................................................... 23

6.4 Defect correlations.......................................................................................... 24

6.5 Performance filters ......................................................................................... 24

7 Information flow across reference points ..................................................................... 25

8 Generic processes ......................................................................................................... 25

8.1 Scrambling processes ..................................................................................... 25

8.2 Alignment processes....................................................................................... 25

8.3 Signal quality supervision .............................................................................. 26

8.4 BIP correction................................................................................................. 28

8.5 OTUk forward error correction (FEC) processing ......................................... 28

8.6 Trail trace identifier (TTI) processing............................................................ 28

8.7 Payload structure indication (PSI) acceptance processes............................... 28

8.8 Status information (STAT) acceptance process ............................................. 29

8.9 Generic AIS generation and detection............................................................ 29

8.10 Generic layer fault processing ........................................................................ 29

8.11 Optical signal processing................................................................................ 32

9 Optical transmission section (OTS) layer functions..................................................... 33

9.1 Connection functions (N/A) ........................................................................... 35

9.2 Termination functions .................................................................................... 35

9.3 Adaptation functions ...................................................................................... 41

10 Optical multiplex section (OMS) layer functions......................................................... 45

10.1 Connection functions (N/A) ........................................................................... 46

10.2 Termination functions .................................................................................... 47

10.3 Adaptation functions ...................................................................................... 52

10.4 Sub-layer functions......................................................................................... 57

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