This document describes internal monitoring of network performance using specific metrics like Answer Seizure Ratio (ASR) and Answer Bid Ratio (ABR). Internal monitoring allows collection of a large volume of records to evaluate daily network performance and troubleshoot issues. Supplementary data on signaling faults, subscriber behavior, and network failures is also exchanged quarterly to further analyze quality of service. Internal automatic observations provide advantages over external monitoring in monitoring network performance.
This document defines traffic measurement requirements for digital telecommunications exchanges. It establishes a generic traffic measurement model based on entities, objects, and traffic flows. Key points:
1. Measurements are defined at different levels, including overall, selectable objects, services, control units, and call records.
2. Major services covered are basic telephone, ISDN, and Intelligent Network (IN) services.
3. A measurement consists of measurement set information, time information, and output routing/scheduling information.
The document provides routing guidelines for efficient routing methods in TDM, ATM and IP networks. It recommends using bandwidth reservation and avoiding long paths under congestion to improve efficiency. While state-dependent routing is emphasized in ATM and IP networks, the document suggests using event-dependent routing or more efficient information dissemination to avoid inefficient flooding. It also recommends quality of service routing rules to ensure performance quality.
This document specifies procedures for establishing, maintaining, and clearing network connections at the ISDN user-network interface. It defines messages exchanged over the D-channel of basic and primary rate interfaces. The messages control circuit-switched calls, packet-mode access connections, and temporary signaling connections. Call states are defined for the user and network sides of the interface, as well as for the global call reference. Message formats and coding of information elements are also specified.
This recommendation provides methods for estimating traffic offered to a circuit-switched telecommunication network based on measurements. It describes procedures to estimate the traffic offered to a circuit group and the origin-destination traffic based on circuit group measurements. Formulas are presented to account for factors like congestion when estimating traffic from busy-hour measurements. Annexes provide additional details on the estimation methods, including a simplified model, derivation of key formulas, and examples of applying the techniques.
This document provides a framework for quality of service (QoS) routing and related traffic engineering methods for IP, ATM, and TDM multiservice networks. It outlines traffic engineering functions including traffic management through call and connection routing, QoS resource management, routing table management, and dynamic transport routing. It also outlines capacity management functions. Recommended traffic engineering methods aim to optimize network performance for reliable traffic movement through control of routing and network design in response to traffic demands. Subsequent recommendations provide more detailed descriptions and analysis of specific traffic engineering methods.
This document defines concepts and methodologies for measuring traffic intensity in communication networks. It describes the concepts of normal and high load conditions and discusses how measured traffic intensities can be used to dimension network resources. Daily and monthly measurement methods are outlined to determine representative normal and high load traffic intensities over different time periods. The assumptions and objectives of the traffic intensity measurements are ensuring measurements capture stationary traffic processes and offered load to adequately size networks.
This document defines the functional building blocks and rules for combining them to describe the optical transport network functionality within equipment, such as optical transmission section termination, optical multiplex section termination, optical channel termination, and optical channel cross-connect functionality. It uses a specification methodology based on functional decomposition and defines functional blocks for the OCh, OTU, and ODU layers of the optical transport network architecture. The functional blocks can be combined to specify UNI and NNI interfaces. Optical technology-dependent aspects are not defined to allow for technology changes within optical subnetworks.
This document defines traffic measurement requirements for digital telecommunications exchanges. It establishes a generic traffic measurement model based on entities, objects, and traffic flows. Key points:
1. Measurements are defined at different levels, including overall, selectable objects, services, control units, and call records.
2. Major services covered are basic telephone, ISDN, and Intelligent Network (IN) services.
3. A measurement consists of measurement set information, time information, and output routing/scheduling information.
The document provides routing guidelines for efficient routing methods in TDM, ATM and IP networks. It recommends using bandwidth reservation and avoiding long paths under congestion to improve efficiency. While state-dependent routing is emphasized in ATM and IP networks, the document suggests using event-dependent routing or more efficient information dissemination to avoid inefficient flooding. It also recommends quality of service routing rules to ensure performance quality.
This document specifies procedures for establishing, maintaining, and clearing network connections at the ISDN user-network interface. It defines messages exchanged over the D-channel of basic and primary rate interfaces. The messages control circuit-switched calls, packet-mode access connections, and temporary signaling connections. Call states are defined for the user and network sides of the interface, as well as for the global call reference. Message formats and coding of information elements are also specified.
This recommendation provides methods for estimating traffic offered to a circuit-switched telecommunication network based on measurements. It describes procedures to estimate the traffic offered to a circuit group and the origin-destination traffic based on circuit group measurements. Formulas are presented to account for factors like congestion when estimating traffic from busy-hour measurements. Annexes provide additional details on the estimation methods, including a simplified model, derivation of key formulas, and examples of applying the techniques.
This document provides a framework for quality of service (QoS) routing and related traffic engineering methods for IP, ATM, and TDM multiservice networks. It outlines traffic engineering functions including traffic management through call and connection routing, QoS resource management, routing table management, and dynamic transport routing. It also outlines capacity management functions. Recommended traffic engineering methods aim to optimize network performance for reliable traffic movement through control of routing and network design in response to traffic demands. Subsequent recommendations provide more detailed descriptions and analysis of specific traffic engineering methods.
This document defines concepts and methodologies for measuring traffic intensity in communication networks. It describes the concepts of normal and high load conditions and discusses how measured traffic intensities can be used to dimension network resources. Daily and monthly measurement methods are outlined to determine representative normal and high load traffic intensities over different time periods. The assumptions and objectives of the traffic intensity measurements are ensuring measurements capture stationary traffic processes and offered load to adequately size networks.
This document defines the functional building blocks and rules for combining them to describe the optical transport network functionality within equipment, such as optical transmission section termination, optical multiplex section termination, optical channel termination, and optical channel cross-connect functionality. It uses a specification methodology based on functional decomposition and defines functional blocks for the OCh, OTU, and ODU layers of the optical transport network architecture. The functional blocks can be combined to specify UNI and NNI interfaces. Optical technology-dependent aspects are not defined to allow for technology changes within optical subnetworks.
This document outlines minimum requirements for IMT-Advanced radio interface technologies. It discusses requirements in several areas:
- Cell spectral efficiency must be at least 2.2 bit/s/Hz/cell for uplink and 2.6 bit/s/Hz/cell for downlink in urban environments.
- Peak spectral efficiency should be at least 15 bit/s/Hz for downlink and 6.75 bit/s/Hz for uplink.
- Scalable bandwidth up to 40 MHz is required, with encouragement for support of up to 100 MHz.
- Cell edge user spectral efficiency is defined but specific values are not given.
This document summarizes an ITU-T recommendation that specifies maximum limits for jitter and wander in digital networks based on the Synchronous Digital Hierarchy (SDH). It defines network interface limits for jitter and wander to ensure interoperability between equipment from different manufacturers and satisfactory network performance. It also specifies minimum equipment tolerance requirements for jitter and wander at SDH network interfaces. The recommendation provides a framework for controlling and limiting the accumulation of jitter and wander throughout SDH networks.
The document describes a low power protocol for wide area wireless networks called LoRaWAN. It is optimized for battery-powered devices that may be mobile or stationary. Key aspects covered include physical packet formats, MAC frame formats, MAC commands for functions like device activation and configuration, and retransmission procedures. The protocol is technically equivalent to the LoRaWAN specification.
This document provides recommendations for defining transmission-related parameters and their test methods for various optical components and subsystems used in long-haul and access networks. It identifies key parameters for components like optical add/drop multiplexers, attenuators, filters, connectors, and more. The recommendations are intended to help standardize how these components are characterized so their performance can be understood and interoperability ensured across systems. Test methods and example parameter values are defined based on other ITU recommendations for different network applications.
1. Cognitive radio helps solve spectrum congestion by allowing secondary users to access unused licensed spectrum without interfering with primary users. It uses spectrum sensing techniques to identify unused portions of spectrum.
2. Common spectrum sensing techniques include energy detection and matched filtering. Energy detection analyzes signal energy to identify unused spectrum, while matched filtering more accurately detects signal types.
3. Spectrum sensing faces challenges including hidden primary users, security issues from spoofing, and ensuring reliability and scalability of data transmission to centralized authorities. Cooperative sensing helps address problems like hidden users through information sharing between radios.
The document is ITU-T Recommendation G.651.1 which recommends characteristics for a 50/125 μm multimode graded index optical fibre cable for use in optical access networks, specifically in multi-tenant building sub-networks. It defines fibre and cable attributes such as dimensions, optical properties, transmission characteristics etc. and provides reference values in tables to ensure compatibility with network equipment standards such as IEEE 802.3. The recommended fibre type is a improved version of the widely used 50/125 μm multimode fibre, allowing cost-effective 1 Gbps Ethernet connectivity over link lengths up to 550m.
This document defines standards for interfaces in optical transport networks. It specifies requirements for optical transport module signals, including optical transport hierarchy, overhead functionality, frame structures, bit rates, and client signal mapping formats. The standards support multiplexing of client signals and wavelength division multiplexing. The document has been revised multiple times to include additional amendments and support new client signals.
Signal Classification and Identification for Cognitive RadioIRJET Journal
This document discusses signal classification and identification techniques for cognitive radios. It evaluates machine learning and statistical signal processing approaches for tasks like automatic modulation classification (AMC) and multi-transmitter identification. For AMC, machine learning outperforms signal processing with 100% accuracy beyond 10dB for 100 test samples, except for 64-QAM. For multi-transmitter identification, machine learning achieves 70-80% accuracy for 2-5 users, outperforming signal processing which achieves 50% accuracy. However, signal processing is faster. The document generates test data using GNU radio and evaluates algorithms like K-nearest neighbor and maximum likelihood for the tasks. It concludes machine learning has higher accuracy but signal processing is faster, so algorithm
The document discusses the history and future vision of remote monitoring technologies (RMT) in the nuclear industry. It summarizes that:
1) RMT has advanced significantly since its first use in 1982, allowing for greater monitoring capabilities through improved connectivity and mobile technologies.
2) RMT provides major benefits like reduced worker radiation exposure and more efficient operations. Its use is growing globally with the U.S. currently leading development.
3) The vision for 2020 is an expansion of RMT to include all workers, integrated systems for onsite and offsite monitoring, and new technologies like biometrics and location tracking to further enhance safety.
4) Key to realizing this vision will be overcoming connectivity challenges through
This document describes the transmission convergence layer specification for Gigabit-capable Passive Optical Networks (G-PON). It defines the frame structure, encapsulation, dynamic bandwidth allocation, operations, administration and maintenance (OAM) functionality, security, and other aspects of the transmission convergence layer. The transmission convergence layer provides the interface between the optical distribution network and the payload data and is responsible for the transmission of different traffic types over the G-PON infrastructure. It allows the transport of services such as voice, video and data at rates up to 2.5 Gbps downstream and 1.25 Gbps upstream through encapsulation using the G-PON Encapsulation Method (GEM).
This document proposes an automatic license issuing system that uses sensors to monitor a driver's behavior during a driving test. The system aims to replace the current manual process of evaluating driving tests. Sensors like force sensors, piezo sensors, MEMS accelerometers, smoke sensors, and an LCD display are mounted on a test vehicle. The sensors collect data on the driver's control of the vehicle and emissions. This data is sent wirelessly via a ZigBee module to a remote server for analysis. The server compares the test data to reference data to evaluate the driver's performance and determine if a license should be issued. The goal is to objectively assess driving ability and prevent illegal or unsafe licenses from being issued.
International Journal of Computational Engineering Research(IJCER)ijceronline
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology.
The document discusses the optical transport network (OTN) standard defined in ITU-T G.709. It describes the OTN layered structure, interfaces and rates, frame structure and overhead, and techniques for testing OTN elements. The OTN architecture allows more efficient transport of client signals using optical channels and standardized overhead to manage network functions like multiplexing and forward error correction.
This document summarizes a recommendation from the International Telecommunication Union (ITU) regarding traffic measurement data analysis. It discusses analyzing measurement data from telecommunication networks to support planning, engineering, and managing networks. The analysis can process data to remove unnecessary values, replace missing data, and calculate parameters. Analysis results like traffic data records and reports can then be used for applications like network dimensioning and performance monitoring.
Vinay Kr Sharma is a telecommunications professional with over 7 years of experience in transmission networks including SDH, OTN, DWDM, and Ethernet. He is currently working as an Associate Network Specialist for Three UK's transmission network in Pune, India, where he monitors the network, troubleshoots faults, and coordinates maintenance activities. Previously, he held roles at Tech Mahindra, Tata Communications, and Bharti Airtel providing service delivery and assurance for domestic and international transmission networks. Vinay has expertise in transmission equipment from manufacturers such as Ciena, Huawei, ECI, and Tejas.
This document summarizes ITU-T Recommendation P.862, which describes an objective method called Perceptual Evaluation of Speech Quality (PESQ) for predicting the subjective quality of narrow-band telephone networks and speech codecs. PESQ can assess the quality of 3.1 kHz handset telephony and narrow-band speech codecs by comparing the original speech signal with the degraded signal processed through the system under test. The recommendation provides a high-level description of the PESQ algorithm, guidance on its use, and results from benchmark tests validating its accuracy in predicting subjective listening quality scores. It includes an ANSI-C reference implementation of PESQ and conformance testing procedures in an electronic attachment.
Radio network planning fundamentalsnewFarzad Ramin
This document discusses radio network propagation models. It introduces the need for propagation models to predict signal strength between transmitters and receivers in mobile networks. It describes simple models like the plane earth model and emphasizes their limitations for mobile networks. It covers diffraction effects and the Fresnel zone concept for non-line of sight paths. It also introduces empirical models based on real-world measurements like Okumura's model that are more accurate but still require tuning with local data measurements. The goal is to select a model that can rapidly and accurately predict path loss across the planned network area.
This document provides an overview of considerations, best practices, and requirements for deploying a virtualized mobile network. It discusses NFV reference architectures and requirements for network orchestrators. It also covers topics like virtualized network security, carrier grade reliability, migration, performance benchmarking, and vertical interoperability. The document aims to outline the key steps mobile operators should take to adopt NFV technology.
With the rapid development of wireless communication, a new intelligent radio monitoring system is needed to replace previous systems. The proposed system can accurately measure radio spectrum usage through analysis of signal characteristics like power, frequency, and bandwidth. It also detects unauthorized electromagnetic signals. The system consists of a computer running simulation software connected to a DTMF decoder and database of authorized frequencies. It determines if received signals are licensed based on their DTMF tones. Unlicensed transmissions are rejected while licensed ones are permitted. This allows effective monitoring and management of radio spectrum usage.
IRJET- AC Motor Fault Analyser by Characteristic AnalysisIRJET Journal
This document presents a portable motor fault analyzer system that can test motors in place. It uses variable frequency drives and servo drives to analyze induction motors and servo motors. Characteristic waveforms from the motors are displayed on a human-machine interface to detect and analyze common faults like overcurrent, overvoltage, and positional errors. The system is comprised of an AC or servo motor, appropriate drive, programmable logic controller to connect the drive and HMI, and an HMI to display the motor waveforms for fault analysis. This allows on-site motor testing without dismantling equipment.
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This document outlines minimum requirements for IMT-Advanced radio interface technologies. It discusses requirements in several areas:
- Cell spectral efficiency must be at least 2.2 bit/s/Hz/cell for uplink and 2.6 bit/s/Hz/cell for downlink in urban environments.
- Peak spectral efficiency should be at least 15 bit/s/Hz for downlink and 6.75 bit/s/Hz for uplink.
- Scalable bandwidth up to 40 MHz is required, with encouragement for support of up to 100 MHz.
- Cell edge user spectral efficiency is defined but specific values are not given.
This document summarizes an ITU-T recommendation that specifies maximum limits for jitter and wander in digital networks based on the Synchronous Digital Hierarchy (SDH). It defines network interface limits for jitter and wander to ensure interoperability between equipment from different manufacturers and satisfactory network performance. It also specifies minimum equipment tolerance requirements for jitter and wander at SDH network interfaces. The recommendation provides a framework for controlling and limiting the accumulation of jitter and wander throughout SDH networks.
The document describes a low power protocol for wide area wireless networks called LoRaWAN. It is optimized for battery-powered devices that may be mobile or stationary. Key aspects covered include physical packet formats, MAC frame formats, MAC commands for functions like device activation and configuration, and retransmission procedures. The protocol is technically equivalent to the LoRaWAN specification.
This document provides recommendations for defining transmission-related parameters and their test methods for various optical components and subsystems used in long-haul and access networks. It identifies key parameters for components like optical add/drop multiplexers, attenuators, filters, connectors, and more. The recommendations are intended to help standardize how these components are characterized so their performance can be understood and interoperability ensured across systems. Test methods and example parameter values are defined based on other ITU recommendations for different network applications.
1. Cognitive radio helps solve spectrum congestion by allowing secondary users to access unused licensed spectrum without interfering with primary users. It uses spectrum sensing techniques to identify unused portions of spectrum.
2. Common spectrum sensing techniques include energy detection and matched filtering. Energy detection analyzes signal energy to identify unused spectrum, while matched filtering more accurately detects signal types.
3. Spectrum sensing faces challenges including hidden primary users, security issues from spoofing, and ensuring reliability and scalability of data transmission to centralized authorities. Cooperative sensing helps address problems like hidden users through information sharing between radios.
The document is ITU-T Recommendation G.651.1 which recommends characteristics for a 50/125 μm multimode graded index optical fibre cable for use in optical access networks, specifically in multi-tenant building sub-networks. It defines fibre and cable attributes such as dimensions, optical properties, transmission characteristics etc. and provides reference values in tables to ensure compatibility with network equipment standards such as IEEE 802.3. The recommended fibre type is a improved version of the widely used 50/125 μm multimode fibre, allowing cost-effective 1 Gbps Ethernet connectivity over link lengths up to 550m.
This document defines standards for interfaces in optical transport networks. It specifies requirements for optical transport module signals, including optical transport hierarchy, overhead functionality, frame structures, bit rates, and client signal mapping formats. The standards support multiplexing of client signals and wavelength division multiplexing. The document has been revised multiple times to include additional amendments and support new client signals.
Signal Classification and Identification for Cognitive RadioIRJET Journal
This document discusses signal classification and identification techniques for cognitive radios. It evaluates machine learning and statistical signal processing approaches for tasks like automatic modulation classification (AMC) and multi-transmitter identification. For AMC, machine learning outperforms signal processing with 100% accuracy beyond 10dB for 100 test samples, except for 64-QAM. For multi-transmitter identification, machine learning achieves 70-80% accuracy for 2-5 users, outperforming signal processing which achieves 50% accuracy. However, signal processing is faster. The document generates test data using GNU radio and evaluates algorithms like K-nearest neighbor and maximum likelihood for the tasks. It concludes machine learning has higher accuracy but signal processing is faster, so algorithm
The document discusses the history and future vision of remote monitoring technologies (RMT) in the nuclear industry. It summarizes that:
1) RMT has advanced significantly since its first use in 1982, allowing for greater monitoring capabilities through improved connectivity and mobile technologies.
2) RMT provides major benefits like reduced worker radiation exposure and more efficient operations. Its use is growing globally with the U.S. currently leading development.
3) The vision for 2020 is an expansion of RMT to include all workers, integrated systems for onsite and offsite monitoring, and new technologies like biometrics and location tracking to further enhance safety.
4) Key to realizing this vision will be overcoming connectivity challenges through
This document describes the transmission convergence layer specification for Gigabit-capable Passive Optical Networks (G-PON). It defines the frame structure, encapsulation, dynamic bandwidth allocation, operations, administration and maintenance (OAM) functionality, security, and other aspects of the transmission convergence layer. The transmission convergence layer provides the interface between the optical distribution network and the payload data and is responsible for the transmission of different traffic types over the G-PON infrastructure. It allows the transport of services such as voice, video and data at rates up to 2.5 Gbps downstream and 1.25 Gbps upstream through encapsulation using the G-PON Encapsulation Method (GEM).
This document proposes an automatic license issuing system that uses sensors to monitor a driver's behavior during a driving test. The system aims to replace the current manual process of evaluating driving tests. Sensors like force sensors, piezo sensors, MEMS accelerometers, smoke sensors, and an LCD display are mounted on a test vehicle. The sensors collect data on the driver's control of the vehicle and emissions. This data is sent wirelessly via a ZigBee module to a remote server for analysis. The server compares the test data to reference data to evaluate the driver's performance and determine if a license should be issued. The goal is to objectively assess driving ability and prevent illegal or unsafe licenses from being issued.
International Journal of Computational Engineering Research(IJCER)ijceronline
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology.
The document discusses the optical transport network (OTN) standard defined in ITU-T G.709. It describes the OTN layered structure, interfaces and rates, frame structure and overhead, and techniques for testing OTN elements. The OTN architecture allows more efficient transport of client signals using optical channels and standardized overhead to manage network functions like multiplexing and forward error correction.
This document summarizes a recommendation from the International Telecommunication Union (ITU) regarding traffic measurement data analysis. It discusses analyzing measurement data from telecommunication networks to support planning, engineering, and managing networks. The analysis can process data to remove unnecessary values, replace missing data, and calculate parameters. Analysis results like traffic data records and reports can then be used for applications like network dimensioning and performance monitoring.
Vinay Kr Sharma is a telecommunications professional with over 7 years of experience in transmission networks including SDH, OTN, DWDM, and Ethernet. He is currently working as an Associate Network Specialist for Three UK's transmission network in Pune, India, where he monitors the network, troubleshoots faults, and coordinates maintenance activities. Previously, he held roles at Tech Mahindra, Tata Communications, and Bharti Airtel providing service delivery and assurance for domestic and international transmission networks. Vinay has expertise in transmission equipment from manufacturers such as Ciena, Huawei, ECI, and Tejas.
This document summarizes ITU-T Recommendation P.862, which describes an objective method called Perceptual Evaluation of Speech Quality (PESQ) for predicting the subjective quality of narrow-band telephone networks and speech codecs. PESQ can assess the quality of 3.1 kHz handset telephony and narrow-band speech codecs by comparing the original speech signal with the degraded signal processed through the system under test. The recommendation provides a high-level description of the PESQ algorithm, guidance on its use, and results from benchmark tests validating its accuracy in predicting subjective listening quality scores. It includes an ANSI-C reference implementation of PESQ and conformance testing procedures in an electronic attachment.
Radio network planning fundamentalsnewFarzad Ramin
This document discusses radio network propagation models. It introduces the need for propagation models to predict signal strength between transmitters and receivers in mobile networks. It describes simple models like the plane earth model and emphasizes their limitations for mobile networks. It covers diffraction effects and the Fresnel zone concept for non-line of sight paths. It also introduces empirical models based on real-world measurements like Okumura's model that are more accurate but still require tuning with local data measurements. The goal is to select a model that can rapidly and accurately predict path loss across the planned network area.
This document provides an overview of considerations, best practices, and requirements for deploying a virtualized mobile network. It discusses NFV reference architectures and requirements for network orchestrators. It also covers topics like virtualized network security, carrier grade reliability, migration, performance benchmarking, and vertical interoperability. The document aims to outline the key steps mobile operators should take to adopt NFV technology.
With the rapid development of wireless communication, a new intelligent radio monitoring system is needed to replace previous systems. The proposed system can accurately measure radio spectrum usage through analysis of signal characteristics like power, frequency, and bandwidth. It also detects unauthorized electromagnetic signals. The system consists of a computer running simulation software connected to a DTMF decoder and database of authorized frequencies. It determines if received signals are licensed based on their DTMF tones. Unlicensed transmissions are rejected while licensed ones are permitted. This allows effective monitoring and management of radio spectrum usage.
IRJET- AC Motor Fault Analyser by Characteristic AnalysisIRJET Journal
This document presents a portable motor fault analyzer system that can test motors in place. It uses variable frequency drives and servo drives to analyze induction motors and servo motors. Characteristic waveforms from the motors are displayed on a human-machine interface to detect and analyze common faults like overcurrent, overvoltage, and positional errors. The system is comprised of an AC or servo motor, appropriate drive, programmable logic controller to connect the drive and HMI, and an HMI to display the motor waveforms for fault analysis. This allows on-site motor testing without dismantling equipment.
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1. INTERNATIONAL TELECOMMUNICATION UNION
ITU-T E.425
TELECOMMUNICATION
STANDARDIZATION SECTOR
OF ITU
(11/98)
SERIES E: OVERALL NETWORK OPERATION,
TELEPHONE SERVICE, SERVICE OPERATION AND
HUMAN FACTORS
Quality of service, network management and traffic
engineering – Network management – Checking the
quality of the international telephone service
Internal automatic observations
ITU-T Recommendation E.425
(Previously CCITT Recommendation)
2. ITU-T E-SERIES RECOMMENDATIONS
OVERALL NETWORK OPERATION, TELEPHONE SERVICE, SERVICE OPERATION AND HUMAN
FACTORS
For further details, please refer to ITU-T List of Recommendations.
OPERATION, NUMBERING, ROUTING AND MOBILE SERVICES
INTERNATIONAL OPERATION
Definitions E.100–E.103
General provisions concerning Administrations E.104–E.119
General provisions concerning users E.120–E.139
Operation of international telephone services E.140–E.159
Numbering plan of the international telephone service E.160–E.169
International routing plan E.170–E.179
Tones in national signalling systems E.180–E.199
Maritime mobile service and public land mobile service E.200–E.229
OPERATIONAL PROVISIONS RELATING TO CHARGING AND ACCOUNTING IN THE
INTERNATIONAL TELEPHONE SERVICE
Charging in the international telephone service E.230–E.249
Measuring and recording call durations for accounting purposes E.260–E.269
UTILIZATION OF THE INTERNATIONAL TELEPHONE NETWORK FOR NON-
TELEPHONY APPLICATIONS
General E.300–E.319
Phototelegraphy E.320–E.329
ISDN PROVISIONS CONCERNING USERS E.330–E.399
QUALITY OF SERVICE, NETWORK MANAGEMENT AND TRAFFIC ENGINEERING
NETWORK MANAGEMENT
International service statistics E.400–E.409
International network management E.410–E.419
Checking the quality of the international telephone service E.420–E.489
TRAFFIC ENGINEERING
Measurement and recording of traffic E.490–E.505
Forecasting of traffic E.506–E.509
Determination of the number of circuits in manual operation E.510–E.519
Determination of the number of circuits in automatic and semi-automatic operation E.520–E.539
Grade of service E.540–E.599
Definitions E.600–E.699
ISDN traffic engineering E.700–E.749
Mobile network traffic engineering E.750–E.799
QUALITY OF TELECOMMUNICATION SERVICES: CONCEPTS, MODELS,
OBJECTIVES AND DEPENDABILITY PLANNING
Terms and definitions related to the quality of telecommunication services E.800–E.809
Models for telecommunication services E.810–E.844
Objectives for quality of service and related concepts of telecommunication services E.845–E.859
Use of quality of service objectives for planning of telecommunication networks E.860–E.879
Field data collection and evaluation on the performance of equipment, networks and
services
E.880–E.899
3. Recommendation E.425 (11/98) i
ITU-T RECOMMENDATION E.425
INTERNAL AUTOMATIC OBSERVATIONS
Summary
This Recommendation describes internal monitoring of network performance using specific
performance parameters such as Answer Seizure Ratio (ASR) and Answer Bid Ratio (ABR). The
advantages of internal monitoring is that a large volume of records can be collected which allows
day-to-day evaluation of network performance.
Source
ITU-T Recommendation E.425 was revised by ITU-T Study Group 2 (1997-2000) and was approved
under the WTSC Resolution No. 1 procedure on the 9th of November 1998.
4. ii Recommendation E.425 (11/98)
FOREWORD
ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of
telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of
the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing
Recommendations on them with a view to standardizing telecommunications on a worldwide basis.
The World Telecommunication Standardization Conference (WTSC), which meets every four years,
establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations
on these topics.
The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in
WTSC Resolution No. 1.
In some areas of information technology which fall within ITU-T’s purview, the necessary standards are
prepared on a collaborative basis with ISO and IEC.
NOTE
In this Recommendation, the expression "Administration" is used for conciseness to indicate both a
telecommunication administration and a recognized operating agency.
INTELLECTUAL PROPERTY RIGHTS
The ITU draws attention to the possibility that the practice or implementation of this Recommendation may
involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence,
validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others
outside of the Recommendation development process.
As of the date of approval of this Recommendation, the ITU had not received notice of intellectual property,
protected by patents, which may be required to implement this Recommendation. However, implementors are
cautioned that this may not represent the latest information and are therefore strongly urged to consult the
TSB patent database.
ITU 1999
All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU.
5. Recommendation E.425 (11/98) iii
CONTENTS
Page
1 Definitions.................................................................................................................. 1
1.1 Essential information (of internal automatic observations) ....................................... 1
1.2 Supplementary information (of internal automatic observations).............................. 1
1.3 Answer Seizure Ratio (ASR) ..................................................................................... 1
1.4 Answer Bid Ratio (ABR) ........................................................................................... 1
1.5 Network Effectiveness Ratio (NER).......................................................................... 1
2 Merits of internal automatic observations.................................................................. 2
3 Time of observations.................................................................................................. 3
4 Exchange of the results of observations..................................................................... 3
6 Destination analysis from service observation data ................................................... 3
7 Details about supplementary information for Signalling System No. 5..................... 4
7.1 Signalling faults.......................................................................................................... 4
7.2 Ineffective calls associated with the calling subscriber.............................................. 4
7.3 Ineffective calls associated with the called subscriber............................................... 4
7.4 Network...................................................................................................................... 4
8 Equipment impact ...................................................................................................... 4
6.
7. Recommendation E.425 (11/98) 1
Recommendation E.425
INTERNAL AUTOMATIC OBSERVATIONS1
(revised in 1998)
1 Definitions
1.1 Essential information (of internal automatic observations)
The Answer Seizure Ratio (ASR) (see 1.3) or Answer Bid Ratio (ABR) (see 1.4), whichever is
appropriate in terms of attempts, completed attempts and percentage completed.
The Network Effectiveness Ratio (NER) (see 1.5) provides a good indication of the ability of a
network to deliver calls.
1.2 Supplementary information (of internal automatic observations)
Information on signalling faults, subscriber behaviour and the network.
1.3 Answer Seizure Ratio (ASR)
ASR gives the relationship between the number of seizures that result in an answer signal and the
total number of seizures. This is a direct measure of the effectiveness of the service being offered and
is usually expressed as a percentage as follows:
ASR =
Seizures resulting in answer signal
Total seizures
100
×
Measurement of ASR may be made on a route or on a destination code basis.
1.4 Answer Bid Ratio (ABR)
Gives the relationship between the number of bids that result in an answer signal and the total
number of bids.
ABR =
Bids resulting in answer signal
Total bids
×100
ABR is expressed as a percentage and is a direct measure of the effectiveness of traffic from the
point of measurement. It is similar to ASR except that it includes bids that do not result in a seizure.
1.5 Network Effectiveness Ratio (NER)
NER is designed to express the ability of networks to deliver calls to the far-end terminal. NER
expresses the relationship between the number of seizures and the sum of the number of seizures
resulting in either an answer signal, or a user busy, or a ring no answer, or in the case of ISDN a
terminal rejection/unavailability. Unlike ASR, NER excludes the effects of customer behaviour and
terminal behaviour.
____________________
1 This Recommendation also applies in case external monitoring equipment is used when a route is
monitored constantly for all or a large (statistical significance) number of calls. Refer to 2.4/E.421.
8. 2 Recommendation E.425 (11/98)
NER = {Seizures Resulting in Answer Signal
+ User Busy (CV = 17)
+ RingNoAnswer (CV = 16, 18, 19)
+ Terminal Rejects/unavailability (CV = 21, 27)
}× 100/Seizures.
Remarks
1) Accurate measurement of NER is more complex than that of ASR.
2) Accurate measurement of NER requires more complete signalling than does ASR.
3) Cause values provided by ITU-T Signalling System No. 7 TUP and ISUP can be used as a
basis for the measurement of NER. This type of data is usually available from systems that
capture signalling information. It may also be available on Call Detail Records.
The following cause value definitions apply: 16 – normal call clearing, 17 – user busy, 18 –
no user responding, 19 – No answer from user, user alerted, 21 – call reject, 27 – destination
out of order.
4) Even if ITU-T Signalling System No. 7 is used on the international link, the use of other
signalling systems in the domestic network, and their interworking with the Signalling
System No. 7 may impact the accuracy of the measure.
5) If multiple exchanges are involved in the connection, accurate translation of the Cause
values across exchanges is necessary.
6) NER should be regarded as a lower bound of the ability of a network to deliver calls. This is
because it is not always possible to determine why calls were not delivered to the terminal.
For example, a network vacant code could be caused by either customer dialling errors or
network routing errors. Customer dialing errors that are not detected by network screening
mechansims will reduce the NER for that network.
7) Call attempts that do not complete due to network screening should not contribute to NER.
For example, a call attempt to a network vacant code caused by customer dialing error that is
detected by screening shall not result in a seizure being counted for NER, and will not
produce an answer, user busy, ring no answer or terminal reject disposition. Improved
network screening can serve to increase the NER of a network.
8) NER is calculated as a percentage of seizures, specifically, seizures of international circuits.
A seizure will be said to have taken place, if the originating international switch has reserved
a trunk for a specific call and has begun the signalling procedure to establish a call over that
trunk.
2 Merits of internal automatic observations
The advantage of internal monitoring is that a large volume of records can be collected. The large
volume of data obtained from an internal observation system allows day-to-day evaluation of
network performance. Daily analysis of this information has proven invaluable in trouble detection,
and, coupled with a good maintenance response, is instrumental in providing the best possible
9. Recommendation E.425 (11/98) 3
Quality of Service2. The disadvantage is that this method does not have the capability of detecting
tones or speech and therefore cannot present a complete representation of all call dispositions.
To overcome this disadvantage, Administrations are advised to use Recommendation E.422 as well
to supplement the data obtained from internal automatic observations.
3 Time of observations
The results of the ASR, ABR daily profile should be recorded. This data can be hourly, in groups of
hours, or a total day.
4 Exchange of the results of observations
4.1 The essential information3 should be exchanged monthly (preferably by facsimile or telex) to
all network analyses points of those Administrations who are interested (the analyses points can then
make comparisons between different streams going to the same destination). If information on ASR
or ABR can be supplied separately for direct routes and indirect routes via transit countries, this
should also be exchanged as being essential information, including the name of the transit country
involved.
4.2 With respect to supplementary data such as: signalling faults, failures due to calling
subscriber, failures due to called subscriber and failures due to the network, a quarterly exchange of
information is appropriate. Because different formats will be required, mail seems the most likely
means to be used for exchanging supplementary data.
4.3 Besides the monthly and quarterly exchange of information, a direct contact on all aspects
should be made (by telephone) as soon as action is required to prevent a persistent drop in the
Quality of Service.
5 Classes of calls
The distinction between classes of calls (such as operator-operator, subscriber-subscriber and
operator-subscriber) is considered useful in identifying problems relating to the Quality of Service.
This can only be done if the language digit4 and some of the subsequent digits are analysed.
6 Destination analysis from service observation data
Consideration should be given to include the dialled digits, as observed by the monitoring
equipment, in the exchange of information, especially for the sake of destination analyses (see
Annex A/E.420).
____________________
2 Using these techniques, one can improve the quality of service even when no distinction can be made
between ring no answer, subscriber busy (or congestion indicated by congestion tone) and recorded
announcement.
3 The Administration supplying the data must indicate whether the ASR or ABR is used.
4 The language or discrimination digit is inserted automatically, or by the operator, between the country
code (see Recommendation E.161) and the national (significant) number.
10. 4 Recommendation E.425 (11/98)
7 Details about supplementary information for Signalling System No. 5
7.1 Signalling faults
– faulty signals;
– time-outs, the main item in this category being no proceed-to-send signal;
– busy flash (since busy flash is applied in many situations, including failures due to calling
and called subscriber and the network, it is considered useful to distinguish between busy
flash received within 0-15 seconds, 15-30 seconds and after 30 seconds when making
destination analysis).
7.2 Ineffective calls associated with the calling subscriber
Premature release, to distinguish between release before or after having received ringing tone;
equipment which can detect audible signals is required.
7.3 Ineffective calls associated with the called subscriber
Ringing tone no answer cannot be detected without equipment which can detect audible signals.
7.4 Network
Here only the busy flash can be detected without equipment which can detect audible signals.
8 Equipment impact
8.1 Administrations are recommended to consider inclusion of appropriate facilities in existing
and new exchanges to record all or some of the following phases:
a) Calls switched to speech position, then:
1) answered;
2) unanswered, but released by calling party;
3) timed out awaiting answer;
4) a call failure signal (busy flash or equivalent) received;
5) timed out after clearback signal;
6) faulty signal received after answer.
b) Calls failing to switch to speech position:
1) clear forward signal received;
2) insufficient digits received;
3) congestion on international circuits;
4) faulty signals received into exchange;
5) signalling fault into next exchange;
6) time out while signalling to next exchange;
7) congestion signal received from next exchange;
8) vacant number received;
9) busy subscriber signal received;
10) line out of order signal received;
11) transferred subscriber signal received.
11. Recommendation E.425 (11/98) 5
As a minimum requirement, one should be capable of determining the Answer Seizure Ratio (ASR)
or the Answer Bid Ratio (ABR). This recording can be done by off-line processing of call records if
they contain some more information than the information already required for international
accounting.
8.2 Another way to assemble date on the Quality of Service (QoS) on outgoing circuit groups is
through event counters. Five event counters already give a reasonable amount of information, three
of them being common to Signalling Systems No. 5, No. 6 and R2: seizure, answer and busy
signals5:
Signalling System No. 5
The number of:
– seizing signals sent;
– end-of-pulsing (ST) signals sent;
– proceed-to-send signals received;
– busy flash signals received;
– answer signals received.
Signalling System No. 6
The number of:
– Initial Address Messages (IAMs) sent;
– congestion (switching-equipment; circuit groups; national network) signals, call-failure
signals and confusion signals received;
– address-complete (subscriber-free, charge; subscriber-free, no charge; subscriber-free,
coinbox; charge; no charge; coinbox) signals received;
– subscriber busy signals received;
– answer (charge; no charge) signals received.
Signalling System R2
The number of:
– seizing signals sent;
– congestion [national network (A4 or B4); international exchange (A15)] signals received;
– address complete (charge; subscriber's line free, charge; subscriber's line free, no charge)
signals received;
– subscriber line busy signals received;
– answer signals received.
____________________
5 In case the event counting is used to analyse the quality of service to a particular destination, the counting
should be done separately for each signalling system.
12.
13. ITU-T RECOMMENDATIONS SERIES
Series A Organization of the work of the ITU-T
Series B Means of expression: definitions, symbols, classification
Series C General telecommunication statistics
Series D General tariff principles
Series E Overall network operation, telephone service, service operation and human factors
Series F Non-telephone telecommunication services
Series G Transmission systems and media, digital systems and networks
Series H Audiovisual and multimedia systems
Series I Integrated services digital network
Series J Transmission of television, sound programme and other multimedia signals
Series K Protection against interference
Series L Construction, installation and protection of cables and other elements of outside plant
Series M TMN and network maintenance: international transmission systems, telephone circuits,
telegraphy, facsimile and leased circuits
Series N Maintenance: international sound programme and television transmission circuits
Series O Specifications of measuring equipment
Series P Telephone transmission quality, telephone installations, local line networks
Series Q Switching and signalling
Series R Telegraph transmission
Series S Telegraph services terminal equipment
Series T Terminals for telematic services
Series U Telegraph switching
Series V Data communication over the telephone network
Series X Data networks and open system communications
Series Y Global information infrastructure
Series Z Programming languages