SIST ETS 300 417-3-1 E1:2003
(Main)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
- Abstract
Functional requirements for the regenerator section and multiplex sec tion layer of SDH interfaces on all types of equipment based on the ge neric principles described in part 1-1.
- Status
- Published
- Publication Date
- 30-Nov-2003
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
SIST ETS 300 417-3-1 E1:2003 is the Slovenian standard identical to ETS 300 417-3-1 Edition 1 from ETSI. It specifies functional requirements for the regenerator section and multiplex section layer of SDH interfaces on equipment, using the generic principles in Part 1-1. It is aimed at people who need a common transport-function model for STM-N equipment, especially for implementation, interoperability, testing and network operation.
What does SIST ETS 300 417-3-1 E1:2003 specify?
SIST ETS 300 417-3-1 E1:2003 specifies a library of basic building blocks and rules for combining them to describe transport functionality in SDH equipment. In practice, this means compliant equipment should be describable as a subset of the functional blocks defined in the standard, connected according to the stated combination rules.
The scope is focused on the regenerator section and multiplex section layer functions of SDH interfaces on all types of equipment based on the generic principles in ETS 300 417-1-1. The document does not try to redefine the whole SDH transport model from scratch - it builds on the generic functionality in Part 1-1.
The standard is organized as follows:
- Clause 1 - Scope
- Clause 2 - Normative references
- Clause 3 - Definitions, abbreviations and symbols
- Clauses 4 to 11 - Layer functions for STM-1, STM-4, STM-16 and STM-64
- Annex A - Normative linear protection switching operation
- Annexes B to E - Informative model, numbering, examples and bibliography
| Annex | What it covers |
|---|---|
| Annex A | Generic specification of linear protection switching operation |
| Annex B | STM-16 regenerator functional model example |
| Annex C | AU-4-Xc numbering scheme and pointer allocation |
| Annex D | MS protection examples |
| Annex E | Bibliography |
What are the key requirements of SIST ETS 300 417-3-1 E1:2003?
SIST ETS 300 417-3-1 E1:2003 defines the STM-N transport building blocks, how they connect, and how they handle adaptation, monitoring and protection. The most important practical point is that an implementation is not free-form - it must fit the named functional model and the protection rules in Clause 4 onward and Annex A.
The standard uses a layered functional model
Clauses 4 to 11 describe regenerator section and multiplex section layer functions for STM-1, STM-4, STM-16 and STM-64. Each level is split into connection, trail termination and adaptation functions, so implementers can map equipment behavior to named blocks such as RS1, MS1, RS4, MS4, RS16 and MS16.
This matters because it lets vendors and operators compare equipment on the same basis. A network element can be checked by seeing which blocks it implements and how those blocks are interconnected.
Regenerator section functions handle the STM signal and access channels
The regenerator section clauses describe the octet-structured, 125 μs framed STM-N signal and the access it provides to overhead and embedded channels. The document shows how the RS layer carries the STM signal itself and how it can expose DCC, orderwire and user-channel paths such as F1, E1 and P0s/V0x-related access where supported.
In practice, this tells designers what information can be terminated, passed through, or adapted at the regenerator section. It is the basis for implementing management communication, user channels and section-level termination.
Multiplex section functions add overhead, monitoring and adaptation
The multiplex section clauses define the MS layer functions for STM-N, including the additional trail termination overhead carried in the multiplex section. They also define adaptation functions to S4, DCC, P0s, synchronization distribution and layer clock functions.
This matters because the multiplex section is where payload mapping, pointer-related behavior, management access and service-specific adaptations are handled. For a buyer or integrator, it shows which services and overhead channels the equipment must support at the MS layer.
The document controls how multiple adaptation sources share an access point
For STM-4 and STM-16, the standard states that more than one adaptation source function can be connected to one access point, but only one source may access a specific AU timeslot. Adaptation sink functions may be active together, although that can cause faults such as cLOP, so they may need to be deactivated.
This is important in configuration work. It prevents two source functions from driving the same timeslot and makes the activation logic part of equipment design and commissioning.
Linear trail protection is defined for 1+1, 1:n and ring cases
Clause 5, Clause 7 and Clause 9 include linear trail protection functions for STM-1, STM-4 and STM-16. The standard covers 1+1 and 1:n linear protection, and STM-16 also includes 2 fibre shared protection ring and 4 fibre shared protection ring functions.
Annex A gives the generic protection process. It defines bridge and selector behavior, the external commands CLR, LO, FSw, MSw and EXER, and the request-priority logic used to choose between working, protection and extra traffic signals.
APS behavior, defects and timing are specified
Annex A also defines how Automatic Protection Switching (APS) is interpreted and generated. It covers request types, remote and local request handling, reverse request behavior, architecture type, and defect detection such as dPAM, dINV, dSCM and dTMOUT.
For practical use, the key point is that automatically initiated protection switching must complete in less than 50 ms, excluding detection and holdoff time. The annex also allows a provisioned holdoff timer and a wait-to-restore state, which are important when coordinating switching and avoiding flapping.
Protection and management channels must be configured consistently
The MS clauses state that DCC, OW and SSM services may be available before or after the protection sublayer, depending on whether protection is used. Where a link uses protected or unprotected services, both ends must operate those services in the same mode.
This matters during integration and troubleshooting. If the two ends are not configured the same way, the link can report defects or behave differently from what the operator expects.
What terms does SIST ETS 300 417-3-1 E1:2003 define?
- SDH (Synchronous Digital Hierarchy) - The transmission hierarchy that the standard uses as its overall framework for transport equipment.
- STM-N (Synchronous Transport Module, level N) - The family of synchronous transport signals covered by the STM-1, STM-4, STM-16 and STM-64 clauses.
- RS (Regenerator Section) - The layer that handles the STM signal at the regenerator section and exposes section-level termination and adaptation functions.
- MS (Multiplex Section) - The layer that adds multiplex-section overhead, monitoring and protection behavior above the regenerator section.
- DCC (Data Communications Channel) - The management communications channel carried in the section overhead for network management functions.
- APS (Automatic Protection Switch) - The signaling mechanism used to coordinate protection switching between working and protection signals.
- SSM (Synchronization Status Message) - The synchronization message channel used in the multiplex section for timing-related information.
- SPRING (Shared Protection RING) - The protection ring architecture covered in the STM-16 multiplex section clauses.
Who uses SIST ETS 300 417-3-1 E1:2003?
ETSI states that the standard was produced to provide inter-vendor and inter-operator compatibility of SDH equipment. That makes it relevant to equipment vendors, network operators, integrators, test labs and maintenance teams that need a common description of STM-N transport functionality.
In practice, these users apply it when they:
- design or verify SDH transport equipment
- map equipment functions to RS and MS layer blocks
- configure DCC, orderwire, user channels and synchronization distribution access
- implement or test linear protection switching and APS behavior
- check interoperability between equipment from different vendors
- document performance monitoring and defect reporting behavior
Quality managers and buyers also use it to compare offers against a shared technical reference rather than vendor-specific terminology.
What changed in SIST ETS 300 417-3-1 E1:2003 from the previous edition?
SIST ETS 300 417-3-1 E1:2003 corresponds to ETS 300 417-3-1 Edition 1.
Which standards are used with SIST ETS 300 417-3-1 E1:2003?
| Standard | What it contributes |
|---|---|
| ETS 300 417-1-1 | Generic functional requirements for SDH equipment, including generic processes, performance, definitions and symbols used throughout this part |
| ETS 300 147 | SDH multiplexing structure and the frame locations used for STM-N overhead and payload mapping |
| ETS 300 166 (1993) | Physical and electrical characteristics of hierarchical digital interfaces |
| ITU-T Recommendation G.783 (1994) | Functional block characteristics for SDH equipment, and the basis for Annex A's protection process |
| ETS 300 746 | APS protocols and operation for SDH protection, especially the shared protection ring cases |
| ETS 300 417-4-1 | SDH path layer functions used by the companion transport-function series |
| prETS 300 417-6-1 | Synchronization distribution layer functions used alongside the multiplex and regenerator layer model |
The foreword also identifies the wider ETS 300 417 series as the companion set:
- Part 1 - Generic processes and performance
- Part 2 - SDH and PDH physical section layer functions
- Part 4 - SDH path layer functions
- Part 5 - PDH path layer functions
- Part 6 - Synchronization distribution layer functions
- Part 7 - Auxiliary layer functions
- Part 8 - Compound and major compound functions
What does the SIST ETS 300 417-3-1 E1:2003 document contain?
The document contains atomic-function diagrams for each STM-N regenerator section and multiplex section layer, with figures showing characteristic information, adapted information and access-point relationships. It also includes frame drawings for STM-1, STM-4 and STM-16 that identify the handled bytes and the overhead areas used for DCC, orderwire, user channels, pointers and protection signaling.
Annex A contains the formal protection-process model, including request handling, priority rules, APS signal fields, defect conditions and subprocess logic. Annex B provides an STM-16 regenerator example, while Annex C shows AU-4 and AU-4-4c numbering and pointer allocation examples. Annex D illustrates multiplex section protection arrangements, including linear protection examples and shared protection examples.
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Frequently Asked Questions
SIST ETS 300 417-3-1 E1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "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". This standard covers: Functional requirements for the regenerator section and multiplex sec tion layer of SDH interfaces on all types of equipment based on the ge neric principles described in part 1-1.
Functional requirements for the regenerator section and multiplex sec tion layer of SDH interfaces on all types of equipment based on the ge neric principles described in part 1-1.
SIST ETS 300 417-3-1 E1:2003 is classified under the following ICS (International Classification for Standards) categories: 33.040.20 - Transmission systems. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST ETS 300 417-3-1 E1:2003 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2003
3UHQRVLQPXOWLSOHNVLUDQMH 70 ±*HQHULþQH]DKWHYH]DSUHQRVQRIXQNFLRQDOQRVW
RSUHPH±GHO )XQNFLMHSODVWLUHJHQHUDWRUVNHJDLQPXOWLSOHNVQHJDRGVHND]D
VLQKURQLSUHQRVQLPRGXO1 6701
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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: 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.
Page 2
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.
Page 3
ETS 300 417-3-1: June 1997
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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ETS 300 417-3-1: June 1997
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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ETS 300 417-3-1: June 1997
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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ETS 300 417-3-1: June 1997
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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ETS 300 417-3-1: June 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)
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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ETS 300 417-3-1: June 1997
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ETS 300 417-3-1: June 1997
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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ETS 300 417-3-1: June 1997
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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ETS 300 417-3-1: June 1997
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
RDI Remote Defect Indication
REI Remote Error Indication
RI Remote Information
RP Remote Point
RS Regenerator Section
RS1 STM-1 Regenerator Section
RS16 STM-16 Regenerator Section
RS4 STM-4 Regenerator Section
RSOH Regenerator Section OverHead
RxTI Received Trace Identifier
S4 VC-4 path layer
SASE Stand-Alone Synchronization Equipment
SD Synchronization Distribution layer, Signal Degrade
SDH Synchronous Digital Hierarchy
SEC SDH Equipment Clock
SF Signal Fail
Sk Sink
SNC Sub-Network Connection
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ETS 300 417-3-1: June 1997
SNC/I Inherently monitored Sub-Network Connection protection
SNC/N Non-intrusively monitored Sub-Network Connection protection
SNC/S Sublayer monitored Sub-Network Connection protection
So Source
SOH Section OverHead
SPRING Shared Protection RING
SR Selected Reference
SSD Server Signal Degrade
SSF Server Signal Fail
SSM Synchronization Status Message
SSU Synchronization Supply Unit
STM Synchronous Transport Module
STM-N Synchronous Transport Module, level N
TCP Termination Connection Point
TI Timing Information
TIM Trace Identifier Mismatch
TM Transmission_Medium
TMN Telecommunications Management Network
TP Timing Point
TPmode Termination Point mode
TS Time Slot
TSD Trail Signal Degrade
TSF Trail Signal Fail
TT Trail Termination function
TTI Trail Trace Identifier
TTs Trail Termination supervisory function
TxTI Transmitted Trace Identifier
UNEQ UNEQuipped
UNI User Network Interface
USR USeR channels
V0 64 kbit/s contradirectional data layer
VC Virtual Container
VC-n Virtual Container, level-n
W Working
3.3 Symbols and Diagrammatic Conventions
The symbols and diagrammatic conventions are described in ETS 300 417-1-1 [1].
3.4 Introduction
The atomic functions defining the regenerator and multiplex section layers are described below (clause 4
onwards).
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ETS 300 417-3-1: June 1997
4 STM-1 Regenerator Section Layer Functions
DCC _CI V0x_CI P0s_CI STM1_TI P0s_CI V0x_CI DCC_CI
M S1_CI M S1_CI
R S1/DCC RS1/P0s-N RS1/P0s-N RS1/V0x RS1/DCC
RS1/V0x RS1/MS1 RS1/MS1
D1-D3 F1 E1,F1 E1,F1 F1 D1-D3
RS1_AI RS1_AI
RS1 RS1
RS1
RS1_C I RS1_CI
Figure 1: STM-1 Regenerator Section atomic functions
RS1 Layer CP
μ
The CI at this point is an octet structured, 125 s framed data stream with co-directional timing. It is the
entire STM-1 signal as defined in ETS 300 147 [2]. Figure 2 depicts only bytes handled in the RS1 layer.
NOTE 1: The unmarked bytes [2, 6], [3, 6], [3, 8], [3, 9] in rows 2,3 (figure 2) are reserved for
future international standardization. Currently, they are undefined.
NOTE 2: The unmarked bytes [2, 2], [2, 3], [2, 5], [3, 2], [3, 3], [3, 5] in rows 2,3 (figure 2) are
reserved for media specific usage (e.g. radio sections). In optical and electrical section
applications they are undefined.
NOTE 3: The bytes for National Use (NU) in rows 1,2 (figure 2) are reserved for operator
specific usage. Their processing is not within the province of this ETS. If NU
bytes [1, 8] and [1, 9] are unused, care should be taken in selecting the binary content
of the bytes which are excluded from the scrambling process of the STM-N signal to
ensure that long sequences of "1"s or "0"s do not occur.
1 2345 6789 10 . 270
A1 A1 A1 A2 A2 A2 J0 NU NU
B1 E1 F1 NU NU
D1 D2 D3
MS1_CI
Figure 2: RS1_CI_D signal
RS1 Layer AP
The AI at this point is octet structured and 125 μs framed with co-directional timing and represents the
combination of adapted information from the MS1 layer (2 403 bytes per frame), the management
communication DCC layer (3 bytes per frame if supported), the OW layer (1 byte per frame if supported)
and the user channel F1 (1 byte per frame if supported). The location of these four components in the
frame is defined in ETS 300 147 [2] and depicted in figure 3.
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ETS 300 417-3-1: June 1997
NOTE 4: Bytes E1, F1 and D1-D3 will be undefined when the adaptation functions sourcing
these bytes are not present in the network element.
1 2345 6789 10 . 270
NU NU
E1 F1 NU NU
D1 D2 D3
MS1_CI
Figure 3: RS1_AI_D signal
4.1 STM-1 Regenerator Section Connection functions
For further study.
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ETS 300 417-3-1: June 1997
4.2 STM-1 Regenerator Section Trail Termination functions
4.2.1 STM-1 Regenerator Section Trail Termination Source RS1_TT_So
Symbol:
RS1_AI
RS1
RS1_TT_So_MI
RS1_CI
Figure 4: RS1_TT_So symbol
Interfaces:
Table 1: RS1_TT_So input and output signals
Input(s) Output(s)
RS1_AI_D RS1_CI_D
RS1_AI_CK RS1_CI_CK
RS1_AI_FS
RS1_TT_So_MI_TxTI
Processes:
The function builds the STM-1 signal by adding the frame alignment information, bytes A1A2, the STM
Section Trace Identifier (STI) byte J0, computing the parity and inserting the B1 byte.
J0: In this byte the function shall insert the Transmitted Trail Trace Identifier TxTI. Its format is described
in ETS 300 417-1-1 [1], subclause 7.1.
B1:
The function shall calculate a Bit Interleaved Parity 8 (BIP-8) code using even parity. The BIP-8 shall
be calculated over all bits of the previous STM-1 frame after scrambling and is placed in byte position B1
of the current STM-1 frame before scrambling (figure 5).
A1A2: The function shall insert the STM-1 frame alignment signal A1A1A1A2A2A2 into the regenerator
section overhead as defined in ETS 300 147 [2].
Scrambler: This function provides scrambling of the RS1_CI. The operation of the scrambler shall be
functionally identical to that of a frame synchronous scrambler of sequence length 127 operating at the
6 7
line rate. The generating polynomial shall be 1 + X + X . The scrambler shall be reset to "1111 1111" on
the most significant bit (MSB) of the byte [1, 10] following the last byte of the STM-1 SOH in the first row.
This bit and all subsequent bits to be scrambled shall be modulo 2 added to the output of the X position
of the scrambler. The scrambler shall run continuously throughout the remaining STM-1 frame.
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ETS 300 417-3-1: June 1997
RS_AI
RS TRACE ID
TxTI
INSERTION
J0
FAS INSERTION
A1
A2
BIP-8
COMPUTATION
B1
SCRAMBLER
RS_CI
Figure 5: Some processes within RS1_TT_So
Defects: None.
Consequent Actions: None.
Defect Correlations:
None.
Performance Monitoring:
None.
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ETS 300 417-3-1: June 1997
4.2.2 STM-1 Regenerator Section Trail Termination Sink RS1_TT_Sk
Symbol:
RS1_AI
RS1
RS1_TT_Sk_MI
RS1_CI
Figure 6: RS1_TT_Sk symbol
Interfaces:
Table 2: RS1_TT_Sk input and output signals
Input(s) Output(s)
RS1_CI_D RS1_AI_D
RS1_CI_CK RS1_AI_CK
RS1_CI_FS RS1_AI_FS
RS1_CI_SSF RS1_AI_TSF
RS1_TT_Sk_MI_ExTI
RS1_TT_Sk_MI_AcTI
RS1_TT_Sk_MI_TPmode RS1_TT_Sk_MI_cTIM
RS1_TT_Sk_MI_TIMdis RS1_TT_Sk_MI_pN_EBC
RS1_TT_Sk_MI_ExTImode RS1_TT_Sk_MI_pN_DS
RS1_TT_Sk_MI_1second
Processes:
This function monitors the STM-1 signal for RS errors, and recovers the RS trail termination status. It
extracts the payload independent overhead bytes (J0, B1) from the RS1 layer Characteristic Information:
Descrambling: The function shall descramble the incoming STM-1 signal. The operation of the
descrambler shall be functionally identical to that of a scrambler in OS1/RS1_A_So.
B1:
Even bit parity is computed for each bit n of every byte of the preceding scrambled STM-1 frame and
compared with bit n of B1 recovered from the current frame (n = 1 to 8 inclusive) (figure 7). A difference
between the computed and recovered B1 values is taken as evidence of one or more errors (nN_B) in the
computation block.
J0
: The Received Trail Trace Identifier RxTI shall be recovered from the J0 byte and shall be made
available as AcTI for network management purposes. The application and acceptance and mismatch
detection process shall be performed as specified in ETS 300 417-1-1 [1], subclauses 7.1 and 8.2.1.3.
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ETS 300 417-3-1: June 1997
RS1_AI
AcTI
dTIM
R S T R AC E ID
J0 ExTI
PROCESS
TIMdis
ExTImode
BIP-8
COMPARISON
B1 violations
DESCRAMBLER
BIP-8
COMPUTATION
RS1_CI
Figure 7: Some processes within RS1_TT_Sk
Defects:
The function shall detect for dTIM defect according the specification in ETS 300 417-1-1 [1],
subclause 8.2.1.
Consequent Actions:
aAIS ← CI_SSF or dTIM
aTSF ← CI_SSF or dTIM
On declaration of aAIS the function shall output an all-ONEs (AIS) signal within 250 μs; on clearing of
aAIS the function shall output normal data within 250 μs.
NOTE 1: The term "CI_SSF" has been added to the conditions for aAIS while the descrambler
function has been moved from the e.g. OS1/RS1_A_Sk to this function. Consequently,
an all-ONEs (AIS) pattern inserted in the mentioned adaptation function would be
descrambled in this function. A "refreshment" of all-ONEs is required.
NOTE 2: The insertion of AIS - especially due to detection of dTIM - will cause the RS-DCC
channel to be "squelched" too, so that control of the NE via this channel is lost. If
control is via this channel only, there is a risk of a dead-lock situation if dTIM is caused
by a misprovisioning of ExTI.
Defect Correlations:
←
cTIM MON and dTIM
Performance Monitoring:
For further study.
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ETS 300 417-3-1: June 1997
4.3 STM-1 Regenerator Section Adaptation functions
4.3.1 STM-1 Regenerator Section to Multiplex Section Adaptation Source RS1/MS1_A_So
Symbol:
MS1_CI
RS1/MS1
RS1_AI
Figure 8: RS1/MS1_A_So symbol
Interfaces:
Table 3: RS1/MS1_A_So input and output signals
Input(s) Output(s)
MS1_CI_D RS1_AI_D
MS1_CI_CK RS1_AI_CK
MS1_CI_FS RS1_AI_FS
MS1_CI_SSF
Processes:
The function multiplexes the MS1_CI data (2 403 bytes/frame) into the STM-1 byte locations defined in
ETS 300 147 [2] and depicted in figure 2.
NOTE 1: There might be cases in which the network element knows that the timing reference
±
for a particular STM-1 interface can not be maintained within 4,6 ppm. For such
cases MS-AIS can be generated. This is network element specific and outside the
scope of this ETS.
Defects: None.
Consequent Actions:
aAIS ← CI_SSF
On declaration of aAIS the function shall output all ONEs signal within 250 μs; on clearing of aAIS the
function shall output normal data within 250 μs. The frequency of the all ONEs signal shall be within
155 520 kHz ± 20 ppm.
NOTE 2: If CI_SSF is not connected (when RS1/MS1_A_So is connected to a MS1_TT_So),
SSF is assumed to be false.
Defect Correlations:
None.
Performance Monitoring:
None.
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ETS 300 417-3-1: June 1997
4.3.2 STM-1 Regenerator Section to Multiplex Section Adaptation Sink RS1/MS1_A_Sk
Symbol:
MS1_CI
RS1/MS1
RS1_AI
Figure 9: RS1/MS1_A_Sk symbol
Interfaces:
Table 4: RS1/MS1_A_Sk input and output signals
Input(s) Output(s)
RS1_AI_D MS1_CI_D
RS1_AI_CK MS1_CI_CK
RS1_AI_FS MS1_CI_FS
RS1_AI_TSF MS1_CI_SSF
Processes:
The function separates MS1_CI data from RS1_AI as depicted in figure 2.
Defects:
None.
Consequent Actions:
←
aSSF AI_TSF
Defect Correlations: None.
Performance Monitoring: None.
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4.3.3 STM-1 Regenerator Section to DCC Adaptation Source RS1/DCC_A_So
Symbol:
DCC_CI_D
DCC_CI_CK
STM-1_TI
RS1/DCC
RS1_AI
Figure 10: RS1/DCC_A_So symbol
Interfaces:
Table 5: RS1/DCC_A_So input and output signals
Input(s) Output(s)
DCC_CI_D RS1_AI_D
STM1_TI_CK DCC_CI_CK
STM1_TI_FS
Processes:
The function multiplexes the DCC CI data (192 kbit/s) into the byte locations D1, D2 and D3 as defined in
ETS 300 147 [2] and depicted in figure 3.
NOTE: DCC transmission can be "disabled" when the matrix connection in the connected
DCC_C function is removed.
Defects:
None.
Consequent Actions:
None.
Defect Correlations: None.
Performance Monitoring: None.
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4.3.4 STM-1 Regenerator Section to DCC Adaptation Sink RS1/DCC_A_Sk
Symbol:
DCC_CI
RS1/DCC
RS1_AI
Figure 11: RS1/DCC_A_Sk symbol
Interfaces:
Table 6: RS1/DCC_A_Sk input and output signals
Input(s) Output(s)
RS1_AI_D DCC_CI_D
RS1_AI_CK DCC_CI_CK
RS1_AI_FS DCC_CI_SSF
RS1_AI_TSF
Processes:
The function separates DCC data from RS Overhead as defined in ETS 300 147 [2] and depicted in
figure 3.
NOTE: DCC processing can be "disabled" when the matrix connection in the connected
DCC_C function is removed.
Defects: None.
Consequent Actions:
aSSF ← AI_TSF
Defect Correlations: None.
Performance Monitoring: None.
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4.3.5 STM-1 Regenerator Section to P0s Adaptation Source RS1/P0s_A_So/N
Symbol:
P0s_CI
N=E1,F1
STM-1_TI
RS1/P0s-N
RS1_AI
Figure 12: RS1/P0s_A_So symbol
Interfaces:
Table 7: RS1/P0s_A_So input and output signals
Input(s) Output(s)
P0s_CI_D RS1_AI_D
P0s_CI_CK
P0s_CI_FS
STM1_TI_CK
STM1_TI_FS
Processes:
This function provides the multiplexing of a 64 kbit/s orderwire or user channel information stream into the
RS1_AI using slip buffering. It takes P0s_CI, a 64 kbit/s signal as defined in ETS 300 166 [3], as an octet
structured bit-stream with a synchronous bit rate of 64 kbit/s, present at its input and inserts it into the
RSOH byte E1 or F1 as defined in ETS 300 147 [2] and depicted in figure 3.
NOTE: Any frequency deviation between the 64 kbit/s signal and the associated STM-1 signal
leads to octet slips.
Frequency justification and bitrate adaptation: The function shall provide an elastic store (slip buffer)
process. The data signal shall be written into the store under control of the associated input clock. The
data shall be read out of the store under control of the STM-1 clock, frame position (STM1_TI), and
justification decisions.
Each justification decision results in a corresponding negative/positive justification action. Upon a positive
justification (slip) action, the reading of one 64 kbit/s octet (8 bits) shall be cancelled once. Upon a
negative justification (slip) action, the same 64 kbit/s octet (8 bits) shall be read out a second time.
The elastic store (slip buffer) shall accommodate at least 18 μs of wander without introducing errors.
64 kbit/s timeslot: The adaptation source function has access to a specific 64 kbit/s channel of the RS
access point. The specific 64 kbit/s channel is defined by the parameter N (N = E1, F1).
Defects: None.
Consequent Actions: None.
Defect Correlations: None.
Performance Monitorin
...