Transmission and Multiplexing (TM); Digital Radio Relay Systems (DRRS); Synchronous Digital Hierarchy (SDH); System performance monitoring parameters of SDH DRRS

To define additional performance requirements for the management of SDH on DRRS.

Prenos in multipleksiranje (TM) – Digitalni radiorelejni sistemi (DRRS) – Sinhrona digitalna hierarhija (SDH) – Parametri za nadzorovanje lastnosti sistemov SDH DRRS

General Information

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

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SLOVENSKI STANDARD
SIST EN 301 129 V1.1.1:2003
01-december-2003

Prenos in multipleksiranje (TM) – Digitalni radiorelejni sistemi (DRRS) – Sinhrona

digitalna hierarhija (SDH) – Parametri za nadzorovanje lastnosti sistemov SDH
DRRS

Transmission and Multiplexing (TM); Digital Radio Relay Systems (DRRS); Synchronous

Digital Hierarchy (SDH); System performance monitoring parameters of SDH DRRS
Ta slovenski standard je istoveten z: EN 301 129 Version 1.1.1
ICS:
33.040.20 Prenosni sistem Transmission systems
33.060.30 Radiorelejni in fiksni satelitski Radio relay and fixed satellite
komunikacijski sistemi communications systems
SIST EN 301 129 V1.1.1:2003 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 301 129 V1.1.1:2003
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SIST EN 301 129 V1.1.1:2003
EN 301 129 V1.1.1 (1998-09)
European Standard (Telecommunications series)
Transmission and Multiplexing (TM);
Digital Radio Relay Systems (DRRS);
Synchronous Digital Hierarchy (SDH);
System performance monitoring parameters of SDH DRRS
---------------------- Page: 3 ----------------------
SIST EN 301 129 V1.1.1:2003
2 EN 301 129 V1.1.1 (1998-09)
Reference
DEN/TM-04037 (agc00ico.PDF)
Keywords
SDH, DRRS, transmission, performance
ETSI
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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 1998.
All rights reserved.
ETSI
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SIST EN 301 129 V1.1.1:2003
3 EN 301 129 V1.1.1 (1998-09)
Contents

Intellectual Property Rights................................................................................................................................5

Foreword ............................................................................................................................................................5

1 Scope........................................................................................................................................................6

2 References................................................................................................................................................7

3 Symbols and abbreviations ......................................................................................................................8

3.1 Symbols ............................................................................................................................................................. 8

3.2 Abbreviations..................................................................................................................................................... 8

4 Introduction..............................................................................................................................................9

5 Functional architecture...........................................................................................................................10

6 Radio specific maintenance parameters.................................................................................................10

6.1 Radio Synchronous Physical Interface (RSPI) performance management....................................................... 10

6.1.1 Performance primitives .............................................................................................................................. 10

6.1.1.1 Received Level (RL)............................................................................................................................. 10

6.1.1.2 Transmitted Level (TL) ........................................................................................................................ 11

6.1.2 Performance events .................................................................................................................................... 12

6.1.2.1 Received Level Threshold Second (RLTS) .......................................................................................... 12

6.1.2.2 Received Level Tide Mark (RLTM)..................................................................................................... 12

6.1.2.3 Transmitted Level Threshold Second (TLTS)...................................................................................... 12

6.1.2.4 Transmitted Level Tide Mark (TLTM) ................................................................................................ 13

6.1.3 Performance data collection and history treatment..................................................................................... 13

6.1.4 Performance data threshold treatment ........................................................................................................ 13

6.2 Radio Protection Switching (RPS) performance management......................................................................... 14

6.2.1 Performance primitives .............................................................................................................................. 14

6.2.1.1 Protection Switch Actual (PSA) ........................................................................................................... 14

6.2.1.2 Protection Switch Request (PSR) ......................................................................................................... 14

6.2.2 Performance events .................................................................................................................................... 14

6.2.2.1 Protection Switch Actual Count (PSAC) .............................................................................................. 14

6.2.2.2 Failed Switch Request Count (FSRC) .................................................................................................. 15

6.2.2.3 Protection Switch Actual Duration (PSAD) ......................................................................................... 15

6.2.2.4 Failed Switch Request Duration (FSRD).............................................................................................. 16

6.2.3 Performance data collection and history treatment..................................................................................... 16

6.2.4 Performance data threshold treatment ........................................................................................................ 17

6.3 Radio OverHead Access (ROHA) performance management ......................................................................... 17

7 Radio specific transmission quality monitoring ....................................................................................17

Annex A (informative): Description of radio specific performance monitoring at reference

point XT dependent on the allocation of RPS functional block................18

Annex B (informative): Application of additional performance parameters for fault

management and error performance management ...................................21

B.1 Examples of RSPI and RPS events and counters behaviours ...............................................................21

B.1.1 Received Level (RL) performance primitive, Received Level Tide Mark (RLTD) and Received Level

Threshold Second (RLTS) performance events............................................................................................... 21

B.1.2 RPS performance events .................................................................................................................................. 23

B.2 Example of usage of additional performance parameters in case of fading phenomena and

equipment fault ......................................................................................................................................25

B.2.1 Rain induced fading event................................................................................................................................ 25

B.2.1.1 DRSS without ATPC.................................................................................................................................. 25

B.2.1.2 Rain induced fading event: DRRS with the ATPC..................................................................................... 26

B.2.2 Far end equipment failure at Tx side................................................................................................................ 27

ETSI
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SIST EN 301 129 V1.1.1:2003
4 EN 301 129 V1.1.1 (1998-09)

B.2.3 Unexpected bad quality in a high frequency SDH DRRS................................................................................ 28

B.2.3.1 Interference ................................................................................................................................................ 28

B.2.3.2 Additional signal loss ................................................................................................................................. 28

B.2.3.3 Equipment degradation .............................................................................................................................. 29

B.2.4 Fading effects in a low frequency SDH DRRS ................................................................................................ 29

B.2.5 Unexpected bad quality in a low frequency SDH DRRS................................................................................. 30

B.2.5.1 Single hop .................................................................................................................................................. 30

B.2.5.2 Protected section ........................................................................................................................................ 30

B.3 Example of maintenance principles .......................................................................................................31

B.3.1 High frequency DRRS in configuration without protection switching............................................................. 31

B.3.1.1 DRRS implemented as a Regenerator Section (RS)................................................................................... 31

B.3.1.1.1 Fault detection and fault analysis.......................................................................................................... 32

B.3.1.1.2 Maintenance procedure based on error performance parameters.......................................................... 33

B.3.1.2 DRRS implemented as a Multiplex Section ............................................................................................... 34

B.3.1.2.1 Fault detection and fault analysis.......................................................................................................... 35

B.3.1.2.2 Maintenance procedure based on error performance parameters.......................................................... 35

B.3.2 DRRS with 1+1 protection switching .............................................................................................................. 35

B.3.2.1 DRRS implementing protection type C...................................................................................................... 35

B.3.2.1.1 Maintenance procedure based on error performance parameters.......................................................... 37

Annex C (informative): Performance monitoring functional architecture ......................................38

C.1 Performance primitive and event generation. ........................................................................................38

C.2 Data collection, history and threshold treatment architecture ...............................................................38

C.2.1 15 minute register ............................................................................................................................................ 39

C.2.2 24 hour register................................................................................................................................................ 40

C.2.3 Threshold crossing notification........................................................................................................................ 40

C.2.4 History register ................................................................................................................................................ 40

Bibliography.....................................................................................................................................................41

History..............................................................................................................................................................42

ETSI
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SIST EN 301 129 V1.1.1:2003
5 EN 301 129 V1.1.1 (1998-09)
Intellectual Property Rights

IPRs essential or potentially essential to the present document may have been declared to ETSI. The information

pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found

in SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect

of ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on the

ETSI Web server (http://www.etsi.fr/ipr or http://www.etsi.org/ipr).

Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee

can be given as to the existence of other IPRs not referenced in SR 000 314 (or the updates on the ETSI Web server)

which are, or may be, or may become, essential to the present document.
Foreword

This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Transmission

and Multiplexing (TM).

The present document describes the performance monitoring functional architecture and requirements which are specific

to the Digital Radio Relay System (DRRS) Network Elements (NE) that use the Synchronous Digital Hierarchy (SDH)

multiplexing structure.
National transposition dates
Date of adoption of this EN: 18 September 1998
Date of latest announcement of this EN (doa): 31 December 1998
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 30 June 1999
Date of withdrawal of any conflicting National Standard (dow): 30 June 1999
ETSI
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SIST EN 301 129 V1.1.1:2003
6 EN 301 129 V1.1.1 (1998-09)
1 Scope

The present document defines the additional specific performance monitoring functional architecture and requirements

to be used for management of Digital Radio Relay Systems (DRRS) which use the Synchronous Digital Hierarchy

(SDH).
Considering that:

- ETS 300 635 [4] and ITU-R Recommendation F.750 [3] define the SDH radio specific functional blocks for

transmission at STM-n data rate;

- ETS 300 785 [5] and ITU-R Recommendation F.750 [3] define the SDH radio specific functional blocks for

transmission at Synchronous Transport Module 0 (STM-0) data rate;

- EN 301 167 [6], ETS 300 417 [7], ITU-T Recommendations G.783 [1] and G.784 [2] define the performance

monitoring architecture and requirements for generic functional blocks used on SDH DRRS and other SDH

equipment;

- ITU-T Recommendation M.3010 [8] defines the standardized logical and functional Telecommunication

Management Network (TMN) architecture.
The present document defines:

- the specific performance primitives and events to be used for performance management of radio specific

functional blocks;

- the general requirements for history treatment associated to each performance event;

- the general requirements for thresholding treatment associated to each performance event;

- the specific transmission quality information which is required for maintenance purpose.

The present document does not define:
- the F interface performance monitoring;
- the performance monitoring related to non radio specific functional blocks;

- the information model to be used on Q interface which is on the study in TC TMN, (work item DEN/TMN-0006,

see bibliography).
- the protocol stack to be used for the message communication function;

- any radio specific additional performance parameter to be used at network level management.

The present document applies on each SDH DRRS independently of the transmission data rate supplied (STM-n or

STM-0).

The parameters defined in the present document are only intended to be used for radio equipment maintenance.

The present document should provide guidance and supporting information for the definition of object-oriented models

within SDH DRRS.

It is not required for that equipment developed prior to the present document to be fully compliant with the present

document.
ETSI
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SIST EN 301 129 V1.1.1:2003
7 EN 301 129 V1.1.1 (1998-09)
2 References
References may be made to:

a) specific versions of publications (identified by date of publication, edition number, version number, etc.), in

which case, subsequent revisions to the referenced document do not apply; or

b) all versions up to and including the identified version (identified by "up to and including" before the version

identity); or

c) all versions subsequent to and including the identified version (identified by "onwards" following the version

identity); or

d) publications without mention of a specific version, in which case the latest version applies.

A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same

number.

[1] ITU-T Recommendation G.783 (1994): "Characteristics of synchronous digital hierarchy (SDH)

equipment functional blocks".

[2] ITU-T Recommendation G.784 (1994): "Synchronous digital hierarchy (SDH) management".

[3] ITU-R Recommendation F.750: "Architectural and functional aspects of radio-relay systems for

SDH-based networks".

[4] ETS 300 635: "Transmission and Multiplexing (TM); Synchronous Digital Hierarchy (SDH); SDH

Radio specific functional blocks for transmission of M x STM-N".

[5] ETS 300 785: "Transmission and Multiplexing (TM); Synchronous Digital Hierarchy (SDH); SDH

Radio specific functional blocks for transmission of M x sub-STM-1".

[6] EN 301 167: "Transmission and Multiplexing (TM); Management of Synchronous Digital

Hierarchy (SDH) transmission equipment; Fault management and performance monitoring;

Functional description".

[7] ETS 300 417: "Transmission and Multiplexing (TM); Generic functional requirements for

Synchronous Digital Hierarchy (SDH) equipment".

[8] ITU-T Recommendation M.3010: "Principles for a Telecommunications management network".

[9] ITU-T Recommendation G.826: "Error performance parameters and objectives for international

constant bit rate digital paths at or above the primary rate".

[10] ITU-T Recommendation G.EPMRS: "Error Performance Events for SDH Multiplex Sections".

[11] ETS 300 411: "Performance monitoring information model for the Network Element (NE) view".

[12] ITU-T Recommendation G.774.01: "Synchronous Digital Hierarchy (SDH) performance

monitoring for the network element view".

[13] ITU-T Recommendation G.707 (1996): "Network node interface for the synchronous digital

hierarchy (SDH)".
[14] Void.

[15] TR 101 035: "Transmission and Multiplexing (TM); Synchronous Digital Hierarchy (SDH) aspects

regarding Digital Radio Relay Systems (DRRS)".

[16] ITU-T Recommendation M.20: "Maintenance philosophy for telecommunications networks".

[17] ITU-T Recommendation G.861: "Principles and guidelines for the integration of satellite and radio

systems in SDH transport networks".
ETSI
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SIST EN 301 129 V1.1.1:2003
8 EN 301 129 V1.1.1 (1998-09)
3 Symbols and abbreviations
3.1 Symbols
For the purposes of the present document, the following symbols apply:
dB decibel
dBm decibel relative to 1 milliWatt
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ATPC Automatic Transmit Power Control
BBE Background Block Error
DRRS Digital Radio Relay System
ES Errored Second
EW Early Warning
FEC Forward Error Correction
FSRD Failed Switch Request Duration
FSRC Failed Switch Request Count
HBER High Bit Error Rate
HO High Order
IF Intermediate Frequency
LBER Low Bit Error Rate
LOS Loss of Signal
MCF Message Communication Function
MS Multiplex Section
MSA Multiplex Section Adaptation
MST Multiplex Section Termination
NE Network Element
OS Operating System
POH Path OverHead
PM Performance Monitoring
PSA Protection Switch Actual
PSAC Protection Switch Actual Count
PSAD Protection Switch Actual Duration
PSR Protection Switch Request
RF Radio Frequency
RL Received Level
RLTD Received Level Tide Mark
RLTM Received Level Tide Mark
RLTS Received Level Threshold Second
ROHA Radio OverHead Access
RPS Radio Protection Switching
RRR Radio Relay Regenerator
RRT Radio Relay Terminal
RS Regenerator Section
RSOH Regenerator Section OverHead
RSPI Radio Synchronous Physical Interface
RST Regenerator Section Termination
SDH Synchronous Digital Hierarchy
SES Severely Erorred Second
SEMF Synchronous Element Management Function
SF Signal Fail
STM-n Synchronous Transport Module n
Sub-STM-1 Sub-Synchronous Transport Module 1 (also defined as STM-0 in
ITU-T Recommendation G.861 [17])
TL Transmitted Level
ETSI
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SIST EN 301 129 V1.1.1:2003
9 EN 301 129 V1.1.1 (1998-09)
TLTD Transmitted Level Tide Mark
TLTM Transmitted Level Tide Mark
TLTS Transmitted Level Threshold Second
TMN Telecommunication Management Network
UAS UnAvailable Second
UAT UnAvailable Time
VC-n Virtual Container n
4 Introduction

The SDH multiplexing frame structure allows in-service quality transmission monitoring at different levels such as

regenerator and multiplex sections and low/high order paths.

SDH Performance Monitoring (PM) is described starting from the definition of the performance primitives, events and

parameters and defining the PM data collection and history treatment together with the way to present PM information

to a managing system at a Q3 interface.

The whole matter is covered by several ITU-T Recommendations and ETSI standards e.g. ITU-T Recommendations

G.783 [1], G.784 [2], G.826 [9], G.EPMRS [10], and G.774.01 [12]; EN 301 167 [6], ETS 300 411 [11] and

ETS 300 417 [7].

SDH radio Network Elements (NE) may terminate, depending on applications, regenerator and multiplex sections and

also high/low order paths. For each one of the above SDH layers implemented inside a SDH radio NE, the associated

standardized PM shall be implemented.

Signal transmission on microwave radios may be affected by mid-air propagation phenomena that may result in

transmission quality degradation. In order to counteract such typical radio feature several counter measures are or may

be implemented inside radio transmission equipment.

The close relationship between transmission quality and radio link propagation cannot be well understood if the PM is

limited only to quality of service.

In particular it is not possible, for a given measured quality, to discriminate among errors due to equipment

degradations, countermeasure unefficiency and unusual or unpredicted bad propagation.

From such a reason the present document covers the need to have radio specific performance parameters to be used in

close conjunction with the ordinary ones related to quality transmission: Severely Errored Second (SES), Errored

Second (ES), Background Block Error (BBE) and UnAvailable Second (UAS).

Radio specific PM defines new radio specific performance primitives, events and parameters with associated

requirements for data collection, threshold and history treatment.

Radio specific PM deals with monitoring of the radio specific functional blocks Radio Synchronous Physical Interface

(RSPI) and Radio Protection Switching (RPS) as defined in ETS 300 635 [4], ETS 300 785 [5] and

ITU-R Recommendation F.750 [3].
Clause 5 describes the general architecture of the radio specific PM process.

All the radio specific performance parameters defined in the present document are not required to meet quality

objectives. Their meaning is consistent only in the hops or link which they refer to. Comparisons among different hops

or links are not meaningful. A true performance comparison among different hops or links can be done only on the base

of the generic SDH quality of service parameters like ES, SES, BBE and UAS.
ETSI
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SIST EN 301 129 V1.1.1:2003
10 EN 301 129 V1.1.1 (1998-09)
From a management point of view the following applications may be envisaged:
- maintenance application:

The presence of the 15 minutes register counters with associated threshold crossing control may be used to

trigger threshold crossing notifications to a managing system. This process may be helpful to indirectly localize

possible degradations of hardware devices like ATPC devices, feeders and antennas for example.

- SDH transmission quality parameters qualification:

The presence of the 15 minutes and 24 hours current register counters like SES, ES, BBE and UAS associated

for each regenerator and multiplex sections terminated in a Radio NE allows to have transmission quality

monitoring of the same sections. The association of radio specific counters on registers of the same period allows

to qualify them.

In particular the values of radio specific counters may give indications on occurrence of propagation fading and

switching activity during these periods helping in the distinction between quality degradation due to equipment or

propagation.
- long term statistics:

The presence of 24 hours history register radio specific counters together with the possibility to transfer their

associated values to a managing system allows the collection at OS level of long term statistics.

This information may also be used to verify the existing propagation prediction methods which are usually used

for link design or develop new ones.
5 Functional architecture

The functional architecture of the radio specific PM (data collection, history and threshold treatment) is compliant to

ITU-T Recommendation G.784 [2] and EN 301 167 [6].
This clause does not define any additional functional architecture requirements.

The functional architecture is reported in the informative annex C for the reader convenience.

6 Radio specific maintenance parameters
6.1 Radio Synchronous Physical Interface (RSPI) performance
management
6.1.1 Performance primitives
6.1.1.1 Received Level (RL)

The RL is the level of the estimated received power at the input of the receiver and may be used to understand if a

predefined period has been affected by fading activity. It may be also used to identify some permanent loss of received

power due to hardware failures.

It must be outlined that this level is an estimation of the received power and that it may be affected by a certain amount

of inaccuracy that is system dependent.
ETSI
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SIST EN 301 129 V1.1.1:2003
11 EN 301 129 V1.1.1 (1998-09)
Moreover the interpretation of the associated values depends on several factors:
- the type of transmission used, i.e. bi-carriers, mono carrier systems;
- the fact that it is usually associated to a wide-band measure;
- the employed frequency.

The RL shall be a performance primitive available at the S50 reference point of the RSPI functional block.

This level shall be readable by a managing system on request.

The parameter unit shall be expressed in dBm and represented by the rounded nearest integer.

In the case that an Intermediate Frequency (IF) combiner is used as a fading countermeasure, only one performance

primitive is required.

In this case this performance primitive is represented by either the level of the combined signal or by the level of the

best single received input signals according to their availability.

In the case that STM-4 reception is implemented be several receivers (even if it is modelled by one single RSPI

functional block) then one RL shall be monitored per each receiver implementing the block. On the consequence the

S50 reference point may provide a multiple RL performance data table.
6.1.1.2 Transmitted Level (TL)

This subclause applies only when the Automatic Transmit Power Control (ATPC) is present. There are no requirements

on TL when the ATPC is not present.

The TL is the level of the estimated transmitted power at the transmitter output. It may be used to monitor the ATPC of

a transmitter.
It may also be used to identify periods of fading activity.
NOTE: Currently implemented ATPC controls are of two kinds:

Continuous power tracking where a control loop keeps the receiver level constant from the activation

threshold down to a fading attenuation equal to the ATPC range, in this case the TL may assume any

value within the ATPC range.

Step control power where only one or few power steps may be activated by the receiver level thresholds

without any control loop, in the latter case the TL assumes discrete values within the ATPC range.

Similar considerations can be done for the TL as reported in subclause 6.1.1.1 for the RL.

The TL shall be a performance primitive available at S50 reference point
...

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