Transmission and Multiplexing (TM); Generic requirements of transport functionality of equipment; Part 2-2: Synchronous Digital Hierarchy (SDH) and Plesiochronous Digital Hierarchy (PDH) physical section layer functions; Implementation Conformance Statement (ICS) proforma specification

DE/TM-01015-2-2

Prenos in multipleksiranje (TM) – Generične zahteve za prenosno funkcionalnost opreme – 2-2. del: Funkcije plasti fizičnega odseka sinhrone digitalne hierarhije (PDH); Proforma specifikacija izjave o skladnosti izvedbe (ICS)

General Information

Status
Published
Publication Date
04-Nov-1997
Current Stage
12 - Completion
Due Date
14-Nov-1997
Completion Date
05-Nov-1997
Standard
ETS 300 417-2-2 E1:2003
English language
127 pages
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Standards Content (Sample)


SLOVENSKI STANDARD
01-december-2003
3UHQRVLQPXOWLSOHNVLUDQMH 70 ±*HQHULþQH]DKWHYH]DSUHQRVQRIXQNFLRQDOQRVW
RSUHPH±GHO)XQNFLMHSODVWLIL]LþQHJDRGVHNDVLQKURQHGLJLWDOQHKLHUDUKLMH
3'+ 3URIRUPDVSHFLILNDFLMDL]MDYHRVNODGQRVWLL]YHGEH ,&6
Transmission and Multiplexing (TM); Generic requirements of transport functionality of
equipment; Part 2-2: Synchronous Digital Hierarchy (SDH) and Plesiochronous Digital
Hierarchy (PDH) physical section layer functions; Implementation Conformance
Statement (ICS) proforma specification
Ta slovenski standard je istoveten z: ETS 300 417-2-2 Edition 1
ICS:
33.040.20 Prenosni sistem Transmission systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 417-2-2
TELECOMMUNICATION November 1997
STANDARD
Source: TM Reference: DE/TM-01015-2-2
ICS: 33.020
Key words: ICS, PDH, SDH, STM, transmission, testing
Transmission and Multiplexing (TM);
Generic requirements of transport
functionality of equipment;
Part 2-2: Synchronous Digital Hierarchy (SDH) and
Plesiochronous Digital Hierarchy (PDH)
physical section layer functions
Implementation Conformance Statement (ICS)
proforma specification
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: secretariat@etsi.fr
Tel.: +33 4 92 94 42 00 - Fax: +33 4 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.
© European Telecommunications Standards Institute 1997. All rights reserved.

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ETS 300 417-2-2: November 1997
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.

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ETS 300 417-2-2: November 1997
Contents
Foreword .9
Introduction.10
1 Scope .11
2 Normative references.11
3 Definitions and abbreviations .12
3.1 Definitions .12
3.2 Abbreviations .12
4 Conformance to this ICS proforma specification.14
Annex A (normative): ICS proforma for ETS 300 417-2-1 .15
A.1 Guidance for completing the ICS proforma.15
A.1.1 Purposes and structure.15
A.1.2 Abbreviations and conventions.15
A.1.3 Instructions for completing the ICS proforma .17
Annex B (normative): ICS proforma for STM-1 optical section layer .18
B.1 Identification of the implementation.18
B.1.1 Date of the statement .18
B.1.2 IUT identification .18
B.1.3 SUT identification.19
B.1.4 Product supplier.19
B.1.5 Client.20
B.1.6 ICS contact person .20
B.2 Identification of the ETS .21
B.3 Global statement of conformance of OS1 layer .21
B.4 OS1 layer description .21
B.5 OS1 layer transmission tables.23
B.5.1 OS1 source operating wavelength range, OS1_TT_So .23
B.5.2 OS1 source spectral characteristics, OS1_TT_So.24
B.5.3 OS1 source optical characteristics, OS1_TT_So .25
B.5.4 OS1 receiver characteristics, OS1_TT_Sk.26
B.5.5 OS1 regeneration characteristics, OS1/RS1_A_So, OS1/RS1_A_Sk.27
B.6 Defect, fault and performance monitoring.28
B.6.1 Port status management.28
B.6.2 Defect detection and clearance criteria .28
B.6.3 Consequent action activation and clearance criteria .29
B.6.4 Defect correlation.29
B.6.5 Performance monitoring .30
Annex C (normative): ICS proforma for STM-4 optical section layer .31
C.1 Identification of the implementation.31
C.1.1 Date of the statement .31
C.1.2 IUT identification .31

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ETS 300 417-2-2: November 1997
C.1.3 SUT identification . 32
C.1.4 Product supplier . 32
C.1.5 Client . 33
C.1.6 ICS contact person. 33
C.2 Identification of the ETS. 34
C.3 Global statement of conformance of OS4 layer. 34
C.4 OS4 layer description . 34
C.5 OS4 layer transmission tables. 36
C.5.1 OS4 source operating wavelength range, OS4_TT_So. 36
C.5.2 OS4 source spectral characteristics, OS4_TT_So . 37
C.5.3 OS4 source optical characteristics, OS4_TT_So. 38
C.5.4 OS4 receiver characteristics, OS4_TT_Sk . 39
C.5.5 OS4 regeneration characteristics, OS4/RS4_A_So, OS4/RS4_A_Sk. 40
C.6 OS4 layer defect, fault and performance monitoring tables . 41
C.6.1 Port status management. 41
C.6.2 Defect detection and clearance criteria. 41
C.6.3 Consequent action activation and clearance criteria. 42
C.6.4 Defect correlation . 42
C.6.5 Performance monitoring. 43
Annex D (normative): ICS proforma for STM-16 optical section layer. 44
D.1 Identification of the implementation . 44
D.1.1 Date of the statement. 44
D.1.2 IUT identification. 44
D.1.3 SUT identification . 45
D.1.4 Product supplier . 45
D.1.5 Client . 46
D.1.6 ICS contact person. 46
D.2 Identification of the ETS. 47
D.3 Global statement of conformance of OS16 layer. 47
D.4 OS16 layer description . 47
D.5 OS16 layer transmission tables. 49
D.5.1 OS16 source operating wavelength range, OS16_TT_So. 49
D.5.2 OS16 source spectral characteristics, OS16_TT_So . 49
D.5.3 OS16 source optical characteristics, OS16_TT_So. 50
D.5.4 OS16 receiver characteristics, OS16_TT_Sk . 51
D.5.5 OS16 regeneration characteristics, OS16/RS16_A_So, OS16/RS16_A_Sk. 52
D.6 OS16 layer defect, fault and performance monitoring tables . 53
D.6.1 Port status management. 53
D.6.2 Defect detection and clearance criteria. 53
D.6.3 Consequent action activation and clearance criteria. 54
D.6.4 Defect correlation . 54
D.6.5 Performance monitoring. 55
Annex E (normative): ICS proforma for STM-1 electrical section layer. 56
E.1 Identification of the implementation . 56
E.1.1 Date of the statement. 56
E.1.2 IUT identification. 56
E.1.3 SUT identification . 57
E.1.4 Product supplier . 57
E.1.5 Client . 58

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ETS 300 417-2-2: November 1997
E.1.6 ICS contact person .58
E.2 Identification of the ETS .59
E.3 Global statement of conformance of ES1 layer.59
E.4 ES1 layer description.59
E.5 ES1 layer transmission tables.59
E.5.1 ES1 layer data stream .59
E.5.2 ES1 layer connection function, ES1_C .59
E.5.3 ES1 layer trail termination functions, ES1_TT_So and ES1_TT_Sk .60
E.5.4 ES1 to RS1 adaptation functions, ES1/RS1_A_So and ES1/RS1_A_Sk.61
E.6 ES1 layer defect, fault and performance monitoring tables .62
E.6.1 Port status management.62
E.6.2 Defect detection and clearance criteria .63
E.6.3 Consequent action activation and clearance criteria .64
E.6.4 Defect correlation.64
E.6.5 Performance monitoring .65
Annex F (normative): ICS proforma for E4 electrical section layer .66
F.1 Identification of the implementation.66
F.1.1 Date of the statement .66
F.1.2 IUT identification .66
F.1.3 SUT identification.67
F.1.4 Product supplier.67
F.1.5 Client.68
F.1.6 ICS contact person .68
F.2 Identification of the ETS .69
F.3 Global statement of conformance of E4 layer.69
F.4 E4 layer description.69
F.5 E4 layer transmission tables .69
F.5.1 E4 layer data stream.69
F.5.2 E4 layer connection function, E4_C.70
F.5.3 E4 layer trail termination functions, E4_TT_So and E4_TT_Sk .70
F.5.4 E4 to P4x adaptation functions, E4/P4x_A_So and E4/P4x_A_Sk .71
F.5.5 E4to P4e adaptation functions, E4/P4e_A_So and E4/P4e_A_Sk.72
F.5.6 E4 to P4s adaptation functions, E4/P4s_A_So and E4/P4s_A_Sk .73
F.6 E4 layer defect, fault and performance monitoring tables.74
F.6.1 Port status management. 74
F.6.2 Defect detection and clearance criteria .75
F.6.3 Consequent action activation and clearance criteria .75
F.6.4 Defect correlation.76
Annex G (normative): ICS proforma for E31 electrical section layer .77
G.1 Identification of the implementation.77
G.1.1 Date of the statement .77
G.1.2 IUT identification .77
G.1.3 SUT identification.78
G.1.4 Product supplier.78
G.1.5 Client.79
G.1.6 ICS contact person .79
G.2 Identification of the ETS .80

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ETS 300 417-2-2: November 1997
G.3 Global statement of conformance of E31 layer . 80
G.4 E31 layer description . 80
G.5 E31 layer transmission tables. 80
G.5.1 E31 layer data stream . 80
G.5.2 E31 layer connection function, E31_C . 81
G.5.3 E31 layer trail termination functions, E31_TT_So and E31_TT_Sk. 81
G.5.4 E31 to P31x adaptation functions, E31/P31x_A_So and E31/P31x_A_Sk. 82
G.5.5 E31to P31e adaptation functions, E31/P31e_A_So and E31/P31e_A_Sk . 83
G.5.6 E31 to P31s adaptation functions, E31/P31s_A_So and E31/P31s_A_Sk. 84
G.6 E31 layer defect, fault and performance monitoring tables . 85
G.6.1 Port status management. 85
G.6.2 Defect detection and clearance criteria. 86
G.6.3 Consequent action activation and clearance criteria. 86
G.6.4 Defect correlation . 87
Annex H (normative): ICS proforma for E22 electrical section layer . 88
H.1 Identification of the implementation . 88
H.1.1 Date of the statement. 88
H.1.2 IUT identification. 88
H.1.3 SUT identification . 89
H.1.4 Product supplier . 89
H.1.5 Client . 90
H.1.6 ICS contact person. 90
H.2 Identification of the ETS. 91
H.3 Global statement of conformance of E22 layer . 91
H.4 E22 layer description . 91
H.5 E22 layer transmission tables. 91
H.5.1 E22 layer data stream . 91
H.5.2 E22 layer connection function, E22_C . 91
H.5.3 E22 layer trail termination functions, E22_TT_So and E22_TT_Sk. 92
H.5.4 E22 to P22x adaptation functions, E22/P22x_A_So and E22/P22x_A_Sk. 92
H.5.5 E22to P22e adaptation functions, E22/P22e_A_So and E22/P22e_A_Sk . 94
H.6 E22 layer defect, fault and performance monitoring tables . 95
H.6.1 Port status management. 95
H.6.2 Defect detection and clearance criteria. 95
H.6.3 Consequent action activation and clearance criteria. 96
H.6.4 Defect correlation . 97
Annex J (normative): ICS proforma for E12 electrical section layer . 98
J.1 Identification of the implementation . 98
J.1.1 Date of the statement. 98
J.1.2 IUT identification. 98
J.1.3 SUT identification . 99
J.1.4 Product supplier . 99
J.1.5 Client . 100
J.1.6 ICS contact person. 100
J.2 Identification of the ETS. 101
J.3 Global statement of conformance of E12 layer . 101
J.4 E12 layer description . 101

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ETS 300 417-2-2: November 1997
J.5 E12 layer transmission tables .102
J.5.1 E12 layer data stream.102
J.5.2 E12 electrical section connection function, E12_C.102
J.5.3 E12layer trail termination functions, E12_TT_So and E12_TT_Sk .102
J.5.4 E12 to P12x adaptation functions, E12/P12x_A_So and E12/P12x_A_Sk .104
J.5.5 E12 to P12s adaptation functions, E12/P12s_A_So and E12/P12s_A_Sk .105
J.6 E12 layer defect, fault and performance monitoring tables.108
J.6.1 Port status management.108
J.6.2 Defect detection and clearance criteria .108
J.6.3 Consequent action activation and clearance criteria .109
J.6.4 Defect correlation.110
Annex K (normative): ICS proforma for T12 electrical section layer .111
K.1 Identification of the implementation.111
K.1.1 Date of the statement .111
K.1.2 IUT identification .111
K.1.3 SUT identification.112
K.1.4 Product supplier.112
K.1.5 Client.113
K.1.6 ICS contact person .113
K.2 Identification of the ETS .114
K.3 Global statement of conformance of T12 layer .114
K.4 T12 layer description .114
K.5 T12 layer transmission tables.114
K.5.1 T12 layer data stream.114
K.5.2 T12layer connection function, T12_C .114
K.5.3 T12layer trail termination functions, T12_TT_So and T12_TT_Sk.115
K.5.4 T12 to SD adaptation functions, T12/SD_A_So and T12/SD_A_Sk.115
K.6 T12 layer defect, fault and performance monitoring tables.116
K.6.1 Port status management.116
K.6.2 Defect detection and clearance criteria .116
K.6.3 Consequent action activation and clearance criteria .116
K.6.4 Defect correlation.117
Annex L (normative): ICS proforma for E0 electrical section layer .118
L.1 Identification of the implementation.118
L.1.1 Date of the statement .118
L.1.2 IUT identification .118
L.1.3 SUT identification.119
L.1.4 Product supplier.119
L.1.5 Client.120
L.1.6 ICS contact person .120
L.2 Identification of the ETS .121
L.3 Global statement of conformance of E0 layer. 121
L.4 E0 layer description.121
L.5 E0 layer transmission tables .121
L.5.1 E0 layer data stream.121
L.5.2 E0 layer connection function, E0_C.121
L.5.3 E0 layer trail termination functions, E0_TT_So and E0_TT_Sk .122
L.5.4 E0 to P0s adaptation functions, E0/P0s_A_So and E0/P0s_A_Sk .123

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ETS 300 417-2-2: November 1997
L.6 E0 layer defect, fault and performance monitoring tables . 124
L.6.1 Port status management. 124
L.6.2 Defect detection and clearance criteria. 124
L.6.3 Consequent action activation and clearance criteria. 124
L.6.4 Defect correlation . 125
Annex M (informative): Bibliography . 126
History. 127

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ETS 300 417-2-2: November 1997
Foreword
This European Telecommunication Standard (ETS) has been produced by the Transmission and
Multiplexing (TM) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS provides the Implementation Conformance Statement (ICS) proforma specification to be used in
connection with conformance/approval testing of Synchronous Digital Hierarchy (SDH) equipment. It is
one of a family of ETSs covering various aspects of SDH equipment standards.
The ICS proforma specification will ultimately consist of 8 sub-parts of ETS 300 417, numbered 1-2 to 8-2,
each of which will correspond to sub-parts 1-1 to 8-1 of ETS 300 417, respectively. The ICS sub-parts are:
Part 1-2: ETS 300 417-1-2: "General information about Implementation Conformance Statement (ICS)
proforma specification";
Part 2-2: ETS 300 417-2-2: "Synchronous Digital Hierarchy (SDH) and Plesiochronous Digital
Hierarchy (PDH) physical section layer functions Implementation Conformance
Statement (ICS) proforma specification";
Part 3-2: ETS 300 417-3-2: "STM-N regenerator and multiplex section layer functions Implementation
Conformance Statement (ICS) proforma specification";
Part 4-2: ETS 300 417-4-2: "SDH path layer functions Implementation Conformance Statement (ICS)
proforma specification";
Part 5-2: ETS 300 417-5-2: "PDH path layer functions Implementation Conformance Statement (ICS)
proforma specification";
Part 6-2: ETS 300 417-6-2: "Synchronization layer functions Implementation Conformance Statement
(ICS) proforma specification";
Part 7-2: ETS 300 417-7-2: "Auxiliary layer functions Implementation Conformance Statement (ICS)
proforma specification";
Part 8-2: ETS 300 417-8-2: "Major compound functions, Implementation Conformance Statement
(ICS) proforma specification".
Transposition dates
Date of adoption: 24 October 1997
Date of latest announcement of this ETS (doa): 28 February 1998
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 August 1998
Date of withdrawal of any conflicting National Standard (dow): 31 August 1998

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ETS 300 417-2-2: November 1997
Introduction
To evaluate conformance of a particular implementation, it is necessary to have a statement of which
capabilities and options have been implemented for a telecommunication specification. Such a statement
is called an Implementation Conformance Statement (ICS).
A client of a test laboratory who requests a conformance/approval test shall provide to the test laboratory
a completed ICS proforma for each layer to be tested and a detailed system description of the
implementation.
The ICS proforma is not another complete description of the related specification, but rather a compact
form of its static conformance requirements, to be used by the test laboratory to identify which test shall
be performed on a given implementation. Not every feature of a profile specification is contained in the
related ICS proforma. For particular cases requiring specific information the ICS can refer to the
appropriate clause of the related specification by means of references, notes and or comments.
The ICS proforma captures the implementation flexibility allowed by the related specification and details
which option are left to the implementor, which are conditionally dependent on other option taken by the
implementor.
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ETS 300 417-2-2: November 1997
1 Scope
This European Telecommunication Standard (ETS) provides the Implementation Conformance Statement
(ICS) proforma specification for the Synchronous Digital Hierarchy (SDH) equipment physical section layer
functions defined in ETS 300 417-2-1 [2] in compliance with the relevant requirements, and in accordance
with the relevant guidance given in ISO/IEC 9646-7 [7] and ETS 300 406 [3].
2 Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to applies.
[1] ETS 300 417-1-1 (1996): "Transmission and Multiplexing (TM); Generic
functional requirements for SDH equipment; Generic processes and
performance".
[2] ETS 300 417-2-1 (1996): "Transmission and Multiplexing (TM); Generic
requirements of transport functionality of equipment: SDH and PDH Physical
section layer functions".
[3] ETS 300 406 (1995): "Methods for testing and Specification (MTS); Protocol and
profile conformance testing specifications; Standardization methodology".
[4] ETS 300 232: "Transmission and Multiplexing (TM); Optical interfaces for
equipments and systems relating to the Synchronous Digital Hierarchy [ITU-T
Recommendation G.957 (1993) modified]".
[5] ITU-T Recommendation G.957 (1993): "Optical interfaces for equipments and
systems relating to the synchronous digital hierarchy".
[6] ISO/IEC 9646-1 (1994): "Information technology - Open systems interconnection
- Conformance testing methodology and framework - Part 1: General concepts".
[7] ISO/IEC 9646-7 (1995): "Information technology - Open systems interconnection
- Conformance testing methodology and framework - Part 7: Implementation
Conformance Statements".
[8] CCITT Recommendation G.703 (1991): "Physical/electrical characteristics of
hierarchical digital interfaces".
[9] CCITT Recommendation G.704 (1991): "Synchronous frame structures used at
primary and secondary hierarchical levels".
[10] CCITT Recommendation G.751 (1988): "Digital multiplex equipments operating
at third order bit rate of 34 368 kbit/s and fourth order bit rate of 139 264 kbit/s
and using positive justification".
[11] ITU-T Recommendation G.823 (1993): "The control of jitter and wander within
digital networks which are based on the 2 048 kbit/s hierarchy".
[12] ITU-T Recommendation G.825 (1993): "The control of jitter and wander within
digital networks which are based on the synchronous digital hierarchy (SDH)".
[13] ITU-T Recommendation G.958 (1993): "Digital line systems based on the
synchronous digital hierarchy for use on optical fibre cables".
[14] ETS 300 167 (1993): "Transmission and Multiplexing (TM); Functional
characteristics of 2 048 kbit/s interfaces".

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ETS 300 417-2-2: November 1997
[15] ETS 300 337 (1993): "Transmission and Multiplexing (TM); Generic frame
structures for the transport of various signals (including Asynchronous Transfer
Mode (ATM) cells and Synchronous Digital Hierarchy (SDH) elements) at the
CCITT Recommendation G.702 hierarchical rates of 2 048 kbit/s, 34 368 kbit/s
and 139 264 kbit/s".
[16] ETS 300 166 (1993): "Transmission and Multiplexing (TM); Physical and
electrical characteristics of hierarchical digital interfaces for equipment using the
2 048 kbit/s - based plesiochronous or synchronous digital hierarchies".
[17] prETS 300 417-6-1 (1997): "Transmission and Multiplexing (TM); Generic
functional requirements for Synchronous Digital Hierarchy (SDH) equipment;
Part 6-1: Synchronization distribution layer functions".
[18] ITU-T Recommendation G.652 (1993): "Characteristics of a single-mode optical
fibre cable".
[19] ITU-T Recommendation G.653 (1993): "Characteristics of a dispersion-shifted
single-mode optical fibre cable".
[20] ITU-T Recommendation G.654 (1993): "Characteristics of a 1550 nm
wavelength loss-minimized single-mode optical fibre cable".
[21] ITU-T Recommendation G.742 (1988): "Second order digital multiplex
equipment operating at 8448 kbit/s and using positive justification".
[22] ITU-T Recommendation G.706 (1991): "Frame alignment and cyclic
redundancy check (CRC) procedures relating to basic frame structures defined
in Recommendation G.704".
[23] prETS 300 417-6-2: "Transmission and Multiplexing (TM); Generic requirements
of transport functionality of equipment; Part 6-2: Synchronization layer functions
Implementation Conformance Statement (ICS) proforma specification".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions apply:
- terms defined in ETS 300 417-2-1 [2];
- terms defined in ISO/IEC 9646-1 [6] and in ISO/IEC 9646-7 [7].
In particular, the following terms defined in ISO/IEC 9646-1 [6] apply:
Implementation Conformance Statement (ICS): A statement made by the supplier of an implementation
or system claimed to conform to a given specification, stating which capabilities have been implemented.
The ICS can take several forms: protocol ICS, profile ICS, profile specific ICS, information object ICS, etc.
ICS proforma: A document, in the form of a questionnaire, which when completed for an implementation
or system becomes an ICS.
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
A Adaptation function
AI Adapted Information
AIS Alarm Indication Signal
BER Bit Error Ratio
C Connection function
CI Characteristic Information
CID Consecutive Identical Digits

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ETS 300 417-2-2: November 1997
CMI Coded Mark Inversion
CP Connection Point
D Data
EMF Equipment Management Function
EMS Equipment Management System
E0 Electrical interface signal 64 kbit/s
E12 Electrical interface signal 2 048 kbit/s
E22 Electrical interface signal 8 448 kbit/s
E31 Electrical interface signal 34 368 kbit/s
E4 Electrical interface signal 139 264 kbit/s
ES1 STM-1 electrical interface signal 155 520 kbit/s
EX EXtinction ratio
FAS Frame Alignment Signal
FS Frame Start
HDB3 High Density Bipolar of order 3
IF In Frame
ICS Implementation Conformance Statement
ID IDentifier
IUT Implementation Under Test
LED Light Emitting Diode
LOF Loss Of Frame
LOS Loss Of Signal
MI Management Information
MLM Multi-Longitudinal Mode (laser)
MON MONitored
N_B Near-end Block
NE Network Element
NMON Not MONitored
OFS Out of Frame Second
OOF Out Of Frame state
OS Optical Section
OS1 STM-1 Optical
...

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