ETSI ETS 300 417-3-1 ed.1 (1997-06)

Transmission and Multiplexing (TM); Generic requirements of transport functionality of equipment; Part 3-1: Synchronous Transport Module-N (STM-N) regenerator and multiplex section layer functions

DE/TM-01015-3-1

Prenos in multipleksiranje (TM) – Generične zahteve za prenosno funkcionalnost opreme – 3-1. del: Funkcije plasti regeneratorskega in multipleksnega odseka za sinhroni prenosni modul-N (STM-N)

General Information

• Status: Published
• Publication Date: 03-Jul-1997
• Technical Committee: TM 1 - TM Core networks, fibres and cables
• Current Stage: 12 - Completion
• Due Date: 08-Jul-1997
• Completion Date: 04-Jul-1997
• Ref Project: SIST ETS 300 417-3-1 E1:2003 - Transmission and Multiplexing (TM); Generic requirements of transport functionality of equipment; Part 3-1: Synchronous Transport Module-N (STM-N) regenerator and multiplex section layer functions

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 417-3-1 E1:2003
01-december-2003
3UHQRVLQPXOWLSOHNVLUDQMH70±*HQHULþQH]DKWHYH]DSUHQRVQRIXQNFLRQDOQRVW
RSUHPH±GHO)XQNFLMHSODVWLUHJHQHUDWRUVNHJDLQPXOWLSOHNVQHJDRGVHND]D
VLQKURQLSUHQRVQLPRGXO16701
Transmission and Multiplexing (TM); Generic requirements of transport functionality of
equipment; Part 3-1: Synchronous Transport Module-N (STM-N) regenerator and
multiplex section layer functions
Ta slovenski standard je istoveten z: ETS 300 417-3-1 Edition 1
ICS:
33.040.20 Prenosni sistem Transmission systems
SIST ETS 300 417-3-1 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 417-3-1 E1:2003

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SIST ETS 300 417-3-1 E1:2003
EUROPEAN ETS 300 417-3-1
TELECOMMUNICATION June 1997
STANDARD
Source: ETSI TC-TM Reference: DE/TM-01015-3-1
ICS: 33.020
Key words: Transmission, SDH, interface
Transmission and Multiplexing (TM);
Generic requirements of transport
functionality of equipment;
Part 3-1: Synchronous Transport Module-N (STM-N)
regenerator and multiplex section layer functions
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: [e-mail]
Tel.: [phone] - Fax: [phone]
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 300 417-3-1: June 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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Contents
Foreword .7
1 Scope .9
2 Normative references.9
3 Definitions, abbreviations and symbols.10
3.1 Definitions .10
3.2 Abbreviations .10
3.3 Symbols and Diagrammatic Conventions.12
3.4 Introduction .12
4 STM-1 Regenerator Section Layer Functions.13
4.1 STM-1 Regenerator Section Connection functions .14
4.2 STM-1 Regenerator Section Trail Termination functions .15
4.2.1 STM-1 Regenerator Section Trail Termination Source RS1_TT_So .15
4.2.2 STM-1 Regenerator Section Trail Termination Sink RS1_TT_Sk.17
4.3 STM-1 Regenerator Section Adaptation functions .19
4.3.1 STM-1 Regenerator Section to Multiplex Section Adaptation Source
RS1/MS1_A_So .19
4.3.2 STM-1 Regenerator Section to Multiplex Section Adaptation Sink
RS1/MS1_A_Sk .20
4.3.3 STM-1 Regenerator Section to DCC Adaptation Source RS1/DCC_A_So.21
4.3.4 STM-1 Regenerator Section to DCC Adaptation Sink RS1/DCC_A_Sk .22
4.3.5 STM-1 Regenerator Section to P0s Adaptation Source RS1/P0s_A_So/N .23
4.3.6 STM-1 Regenerator Section to P0s Adaptation Sink RS1/P0s_A_Sk/N.24
4.3.7 STM-1 Regenerator Section toV0x Adaptation Source RS1/V0x_A_So.25
4.3.8 STM-1 Regenerator Section to V0x Adaptation Sink RS1/V0x_A_Sk .26
5 STM-1 Multiplex Section Layer Functions.27
5.1 STM-1 Multiplex Section Connection functions .29
5.2 STM-1 Multiplex Section Trail Termination functions .30
5.2.1 STM-1 Multiplex Section Trail Termination Source MS1_TT_So.30
5.2.2 STM-1 Multiplex Section Trail Termination Sink MS1_TT_Sk .31
5.3 STM-1 Multiplex Section Adaptation functions .34
5.3.1 STM-1 Multiplex Section to S4 Layer Adaptation Source MS1/S4_A_So.34
5.3.2 STM-1 Multiplex Section to S4 Layer Adaptation Sink MS1/S4_A_Sk .37
5.3.3 STM-1 Multiplex Section to DCC Adaptation Source MS1/DCC_A_So.39
5.3.4 STM-1 Multiplex Section to DCC Adaptation Sink MS1/DCC_A_Sk.40
5.3.5 STM-1 Multiplex Section to P0s Adaptation Source MS1/P0s_A_So .41
5.3.6 STM-1 Multiplex Section to P0s Adaptation Sink MS1/P0s_A_Sk.42
5.3.7 STM-1 Multiplex Section to Synchronization Distribution Adaptation
Source MS1/SD_A_So.42
5.3.8 STM-1 Multiplex Section to Synchronization Distribution Adaptation Sink
MS1/SD_A_Sk .43
5.3.9 STM-1 Multiplex Section Layer Clock Adaptation Source MS1-LC_A_So.43
5.4 STM-1 Multiplex Section Layer Monitoring Functions.43
5.5 STM-1 Multiplex Section Linear Trail Protection Functions .44
5.5.1 STM-1 Multiplex Section Linear Trail Protection Connection Functions .44
5.5.1.1 STM-1 Multiplex Section 1+1 Linear Trail Protection
Connection MS1P1+1_C .44
5.5.1.2 STM-1 Multiplex Section 1:n Linear Trail Protection
Connection MS1P1:n_C .46
5.5.2 STM-1 Multiplex Section Linear Trail Protection Trail Termination
Functions.48
5.5.2.1 Multiplex Section Protection Trail Termination Source
MS1P_TT_So .48

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5.5.2.2 Multiplex Section Protection Trail Termination Sink
MS1P_TT_Sk. 49
5.5.3 STM-1 Multiplex Section Linear Trail Protection Adaptation Functions. 50
5.5.3.1 STM-1 Multiplex Section to STM-1 Multiplex Section
Protection Layer Adaptation Source MS1/MS1P_A_So . 50
5.5.3.2 STM-1 Multiplex Section to STM-1 Multiplex Section
Protection Layer Adaptation Sink MS1/MS1P_A_Sk. 51
6 STM-4 Regenerator Section Layer Functions . 52
6.1 STM-4 Regenerator Section Connection functions. 53
6.2 STM-4 Regenerator Section Trail Termination functions. 54
6.2.1 STM-4 Regenerator Section Trail Termination Source RS4_TT_So . 54
6.2.2 STM-4 Regenerator Section Trail Termination Sink RS4_TT_Sk. 56
6.3 STM-4 Regenerator Section Adaptation functions. 58
6.3.1 STM-4 Regenerator Section to Multiplex Section Adaptation Source
RS4/MS4_A_So. 58
6.3.2 STM-4 Regenerator Section to Multiplex Section Adaptation Sink
RS4/MS4_A_Sk. 59
6.3.3 STM-4 Regenerator Section to DCC Adaptation Source RS4/DCC_A_So. 60
6.3.4 STM-4 Regenerator Section to DCC Adaptation Sink RS4/DCC_A_Sk . 61
6.3.5 STM-4 Regenerator Section to P0s Adaptation Source RS4/P0s_A_So/N. 62
6.3.6 STM-4 Regenerator Section to P0s Adaptation Sink RS4/P0s_A_Sk/N . 63
6.3.7 STM-4 Regenerator Section to V0x Adaptation Source RS4/V0x_A_So . 64
6.3.8 STM-4 Regenerator Section to V0x Adaptation Sink RS4/V0x_A_Sk. 65
7 STM-4 Multiplex Section Layer Functions .66
7.1 STM-4 Multiplex Section Connection functions. 68
7.2 STM-4 Multiplex Section Trail Termination functions. 69
7.2.1 STM-4 Multiplex Section Trail Termination Source MS4_TT_So. 69
7.2.2 STM-4 Multiplex Section Trail Termination Sink MS4_TT_Sk . 71
7.3 STM-4 Multiplex Section Adaptation functions. 74
7.3.1 STM-4 Multiplex Section to S4 Layer Adaptation Source MS4/S4_A_So/N. 74
7.3.2 STM-4 Multiplex Section to S4 Layer Adaptation Sink MS4/S4_A_Sk/N . 77
7.3.3 STM-4 Multiplex Section to S4-4c Layer Adaptation Source
MS4/S4-4c_A_So . 79
7.3.4 STM-4 Multiplex Section to S4-4c Layer Adaptation Sink
MS4/S4-4c_A_Sk . 82
7.3.5 STM-4 Multiplex Section to DCC Adaptation Source MS4/DCC_A_So . 84
7.3.6 STM-4 Multiplex Section to DCC Adaptation Sink MS4/DCC_A_Sk. 85
7.3.7 STM-4 Multiplex Section to P0s Adaptation Source MS4/P0s_A_So. 86
7.3.8 STM-4 Multiplex Section to P0s Adaptation Sink MS4/P0s_A_Sk . 87
7.3.9 STM-4 Multiplex Section to Synchronization Distribution Adaptation
Source MS4/SD_A_So . 87
7.3.10 STM-4 Multiplex Section to Synchronization Distribution Adaptation Sink
MS4/SD_A_Sk. 88
7.3.11 STM-4 Multiplex Section Layer Clock Adaptation Source MS4-LC_A_So . 88
7.4 STM-4 Multiplex Section Layer Monitoring Functions. 88
7.5 STM-4 Multiplex Section Linear Trail Protection Functions . 89
7.5.1 STM-4 Multiplex Section Linear Trail Protection Connection Functions. 89
7.5.1.1 STM-4 Multiplex Section 1+1 Linear Trail Protection
Connection MS4P1+1_C . 89
7.5.1.2 STM-4 Multiplex Section 1:n Linear Trail Protection
Connection MS4P1:n_C. 91
7.5.2 STM-4 Multiplex Section Linear Trail Protection Trail Termination
Functions . 93
7.5.2.1 Multiplex Section Protection Trail Termination Source
MS4P_TT_So . 93
7.5.2.2 Multiplex Section Protection Trail Termination Sink
MS4P_TT_Sk. 94
7.5.3 STM-4 Multiplex Section Linear Trail Protection Adaptation Functions. 95
7.5.3.1 STM-4 Multiplex Section to STM-4 Multiplex Section
Protection Layer Adaptation Source MS4/MS4P_A_So . 95

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7.5.3.2 STM-4 Multiplex Section to STM-4 Multiplex Section
Protection Layer Adaptation Sink MS4/MS4P_A_Sk.96
8 STM-16 Regenerator Section Layer Functions.97
8.1 STM-16 Regenerator Section Connection functions .98
8.2 STM-16 Regenerator Section Trail Termination functions .99
8.2.1 STM-16 Regenerator Section Trail Termination Source RS16_TT_So .99
8.2.2 STM-16 Regenerator Section Trail Termination Sink RS16_TT_Sk.101
8.3 STM-16 Regenerator Section Adaptation functions .103
8.3.1 STM-16 Regenerator Section to Multiplex Section Adaptation Source
RS16/MS16_A_So .103
8.3.2 STM-16 Regenerator Section to Multiplex Section Adaptation Sink
RS16/MS16_A_Sk .104
8.3.3 STM-16 Regenerator Section to DCC Adaptation Source
RS16/DCC_A_So.105
8.3.4 STM-16 Regenerator Section to DCC Adaptation Sink RS16/DCC_A_Sk .106
8.3.5 STM-16 Regenerator Section to P0s Adaptation Source
RS16/P0s_A_So/N.107
8.3.6 STM-16 Regenerator Section to P0s Adaptation Sink RS16/P0s_A_Sk/N.108
8.3.7 STM-16 Regenerator Section to V0x Adaptation Source RS16/V0x_A_So 109
8.3.8 STM-16 Regenerator Section to V0x Adaptation Sink RS16/V0x_A_Sk .110
9 STM-16 Multiplex Section Layer Functions.111
9.1 STM-16 Multiplex Section Connection functions .116
9.2 STM-16 Multiplex Section Trail Termination functions .116
9.2.1 STM-16 Multiplex Section Trail Termination Source MS16_TT_So.116
9.2.2 STM-16 Multiplex Section Trail Termination Sink MS16_TT_Sk .118
9.3 STM-16 Multiplex Section Adaptation functions .121
9.3.1 STM-16 Multiplex Section to S4 Layer Adaptation Source
MS16/S4_A_So/N .121
9.3.2 STM-16 Multiplex Section to S4 Layer Adaptation Sink MS16/S4_A_Sk/N 124
9.3.3 STM-16 Multiplex Section to S4-4c Layer Adaptation Source
MS16/S4-4c_A_So/N .126
9.3.4 STM-16 Multiplex Section to S4-4c Layer Adaptation Sink
MS16/S4-4c_A_Sk/N .129
9.3.5 STM-16 Multiplex Section to DCC Adaptation Source MS16/DCC_A_So.131
9.3.6 STM-16 Multiplex Section to DCC Adaptation Sink MS16/DCC_A_Sk.132
9.3.7 STM-16 Multiplex Section to P0s Adaptation Source MS16/P0s_A_So .133
9.3.8 STM-16 Multiplex Section to P0s Adaptation Sink MS16/P0s_A_Sk.134
9.3.9 STM-16 Multiplex Section to Synchronization Distribution Adaptation
Source MS16/SD_A_So.134
9.3.10 STM-16 Multiplex Section to Synchronization Distribution Adaptation Sink
MS16/SD_A_Sk .135
9.3.11 STM-16 Multiplex Section Layer Clock Adaptation Source MS16-
LC_A_So .135
9.4 STM-16 Multiplex Section Layer Monitoring Functions.135
9.5 STM-16 Multiplex Section Linear Trail Protection Functions .136
9.5.1 STM-16 Multiplex Section Linear Trail Protection Connection Functions .136
9.5.1.1 STM-16 Multiplex Section 1+1 Linear Trail Protection
Connection MS16P1+1_C .136
9.5.1.2 STM-16 Multiplex Section 1:n Linear Trail Protection
Connection MS16P1:n_C .138
9.5.2 STM-16 Multiplex Section Linear Trail Protection Trail Termination
Functions.140
9.5.2.1 Multiplex Section Protection Trail Termination Source
MS16P_TT_So .140
9.5.2.2 Multiplex Section Protection Trail Termination Sink
MS16P_TT_Sk .141
9.5.3 STM-16 Multiplex Section Linear Trail Protection Adaptation Functions .142
9.5.3.1 STM-16 Multiplex Section to STM-16 Multiplex Section
Protection Layer Adaptation Source MS16/MS16P_A_So 142
9.5.3.2 STM-16 Multiplex Section to STM-16 Multiplex Section
Protection Layer Adaptation Sink MS16/MS16P_A_Sk.143

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9.6 STM-16 Multiplex Section 2 Fibre Shared Protection Ring Functions . 144
9.6.1 STM-16 Multiplex Section 2 Fibre Shared Protection Ring Connection
MS16P2fsh_C. 144
9.6.2 STM-16 Multiplex Section 2 Fibre Shared Protection Ring Trail
Termination Functions . 148
9.6.2.1 STM-16 Multiplex Section 2 Fibre Shared Protection Ring
Trail Termination Source MS16P2fsh_TT_So. 148
9.6.2.2 STM-16 Multiplex Section 2 Fibre Shared Protection Ring
Trail Termination Sink MS16P2fsh_TT_Sk. 149
9.6.3 STM-16 Multiplex Section 2 Fibre Shared Protection Ring Adaptation
Functions . 150
9.6.3.1 STM-16 Multiplex Section to STM-16 Multiplex Section 2
Fibre Shared Protection Ring Adaptation Source
MS16/MS16P2fsh_A_So . 150
9.6.3.2 STM-16 Multiplex Section to STM-16 Multiplex Section 2
Fibre Shared Protection Ring Adaptation Sink
MS16/MS16P2fsh_A_Sk . 151
9.7 STM-16 Multiplex Section 4 Fibre Shared Protection Ring Functions . 152
9.7.1 STM-16 Multiplex Section 4 Fibre Shared Protection Ring Connection
MS16P4fsh_C. 152
9.7.2 STM-16 Multiplex Section 4 Fibre Shared Protection Ring Trail
Termination Functions . 152
9.7.2.1 STM-16 Multiplex Section 4 Fibre Shared Protection Ring
Trail Termination Source MS16P4fsh_TT_So. 152
9.7.2.2 STM-16 Multiplex Section 4 Fibre Shared Protection Ring
Trail Termination Sink MS16P4fsh_TT_Sk. 152
9.7.3 STM-16 Multiplex Section 4 Fibre Shared Protection Ring Adaptation
Functions . 152
9.7.3.1 STM-16 Multiplex Section to STM-16 Multiplex Section 4
Fibre Shared Protection Ring Adaptation Source
MS16/MS16P4fsh_A_So . 152
9.7.3.2 STM-16 Multiplex Section to STM-16 Multiplex Section 4
Fibre Shared Protection Ring Adaptation Sink
MS16/MS16P4fsh_A_Sk . 152
10 STM-64 Regenerator Section layer functions. 152
11 STM-64 Multiplex Section layer functions. 152
Annex A (normative): Generic specification of linear protection switching operation . 153
A.1 Protection process overview . 154
A.2 External switch commands definition. 156
A.3 Conditions of working and protection trail/connections . 157
A.4 States within protection process. 157
A.5 Numbering of working, protection, normal, extra traffic, null signals. 158
A.6 Priority of request types (conditions, external commands, states). 159
A.7 APS signal definition . 160
A.7.1 APS signal fields. 160
A.7.2 STM-N MS-APS. 162
A.7.3 STM-N VC-APS. 162
A.8 Switch performance: switching and holdoff times . 162
A.9 Subprocesses . 163
Annex B (informative): STM-16 regenerator functional model (example) . 171
Annex C (informative): AU-4-Xc numbering scheme & pointer allocation. 172
Annex D (informative): MS protection examples . 176
Annex E (informative): Bibliography . 178
History. 179

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Foreword
This European Telecommunication Standard (ETS) has been produced by the Transmission and
Multiplexing (TM) Technical Committee of the European Telecommunications Standards Institute (ETSI)
in order to provide inter-vendor and inter-operator compatibility of SDH equipments.
This ETS has been produced in order to provide inter-vendor and inter-operator compatibility for transport
functionality of equipment.
This ETS consists of 8 parts as follows:
Part 1: "Generic processes and performance" (ETS 300 417-1-1);
Part 2: "SDH and PDH physical section layer functions" (ETS 300 417-2-1);
Part 3: "STM-N regenerator and multiplex section layer functions" (ETS 300 417-3-1);
Part 4: "SDH path layer functions" (ETS 300 417-4-1);
Part 5: "PDH path layer functions" (ETS 300 417-5-1);
Part 6: "Synchronization distribution layer functions" (ETS 300 417-6-1);
Part 7: "Auxiliary layer functions" (ETS 300 417-7-1);
Part 8: "Compound and major compound functions" (ETS 300 417-8-1).
Transposition dates
Date of adoption: 4 April 1997
Date of latest announcement of this ETS (doa): 30 September 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 March 1998
Date of withdrawal of any conflicting National Standard (dow): 31 March 1998

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1 Scope
This European Telecommunication Standard (ETS) specifies a library of basic building blocks and a set of
rules by which they are combined in order to describe transport functionality of equipment. The library
comprises the functional building blocks needed to completely specify the generic functional structure of
the European Transmission Hierarchies. Equipment which is compliant with this ETS needs to be
describable as an interconnection of a subset of these functional blocks contained within this ETS. The
interconnections of these blocks need to obey the combination rules given. The generic functionality is
described in ETS 300 417-1-1 [1].
2 Normative references
This ETS incorporates by dated or 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 amendments or revisions. For undated references the
latest edition of the publication referred to applies.
[1] ETS 300 417-1-1: "Transmission and Multiplexing (TM); Generic functional
requirements for Synchronous Digital Hierarchy (SDH) equipment; Part 1-1:
Generic processes and performance".
[2] ETS 300 147: "Transmission and Multiplexing (TM); Synchronous Digital
Hierarchy (SDH) Multiplexing structure".
[3] 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".
[4] ITU-T Recommendation G.783 (1994): "Characteristics of synchronous digital
hierarchy (SDH) equipment functional blocks".
[5] ETS 300 746: "Transmission and Multiplexing (TM); Synchronous Digital
Hierarchy (SDH); Automatic Protection Switching (APS) protocols and
operation".
[6] ETS 300 417-4-1: "Transmission and Multiplexing (TM); Generic requirements
of transport functionality of equipment; Part 4-1: SDH path layer functions".
[7] prETS 300 417-6-1: "Transmission and Multiplexing (TM); Generic requirements
of transport functionality of equipment; Part 6-1: Synchronization distribution
layer functions".

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3 Definitions, abbreviations and symbols
3.1 Definitions
The functional definitions are described in ETS 300 417-1-1 [1].
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
A Adaptation function
AcTI Accepted Trace Identifier
ADM Add-Drop Multiplexer
AI Adapted Information
AIS Alarm Indication Signal
AP Access Point
APId Access Point Identifier
APS Automatic Protection Switch
AU Administrative Unit
AUG Administrative Unit Group
AU-n Administrative Unit, level n
BER Bit Error Ratio
BIP Bit Interleaved Parity
BIP-N Bit Interleaved Parity, width N
C Connection function
CI Characteristic Information
CK ClocK
CM Connection Matrix
CP Connection Point
CS Clock Source
D Data
DCC Data Communications Channel
DEC DECrement
DEG DEGraded
DEGTHR DEGraded THReshold
EBC Errored Block Count
ECC Embedded Communications Channel
ECC(x) Embedded Communications Channel, layer x
EDC Error Detection Code
EDCV Error Detection Code Violation
EMF Equipment Management Function
EQ EQuipment
ES Electrical Section
ES Errored Second
ExTI Expected Trace Identifier
F_B Far-end Block
FAS Frame Alignment Signal
FOP Failure Of Protocol
FS Frame Start signal
HO Higher Order
HOVC Higher Order Virtual Container
HP Higher order Path
ID IDentifier
IF In Frame state
INC INCrement
INV INValid
LC Link Connection
LO Lower Order
LOA Loss Of Alignment; generic for LOF, LOM, LOP
LOF Loss Of Frame
LOP Loss Of Pointer
LOS Loss Of Signal
LOVC Lower Order Virtual Container

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MC Matrix Connection
MCF Message Communications Function
MDT Mean Down Time
mei maintenance event information
MI Management Information
MO Managed Object
MON MONitored
MP Management Point
MS Multiplex Section
MS1 STM-1 Multiplex Section
MS16 STM-16 Multiplex Section
MS4 STM-4 Multiplex Section
MSB Most Significant Bit
MSOH Multiplex Section OverHead
MSP Multiplex Section Protection
MSPG Multiplex Section Protection Group
NC Not Connected
N_B Near-end Block
NC Network Connection
NDF New Data Flag
NE Network Element
NMON Not MONitored
NNI Network Node Interface
NU National Use (bits, bytes)
NUx National Use, bit rate order x
OAM Operation, Administration and Maintenance
OFS Out of Frame Second
OOF Out Of Frame state
OS Optical Section
OSI(x) Open Systems Interconnection, layer x
OW Order Wire
P Protection
P_A Protection Adaptation
P_C Protection Connection
P_TT Protection Trail Termination
PDH Plesiochronous Digital Hierarchy
PJE Pointer Justification Event
PM Performance Monitoring
Pn Plesiochronous signal, level n
POH Path OverHead
PRC Primary Reference Clock
PS Protection Switching
PSC Protection Switch Count
PTR PoinTeR
QOS Quality Of Service
R
...