A Simulation Tool for Dimensioning and Performance Evaluation of the UMTS

A Simulation Tool for Dimensioning and Performance Evaluation of the UMTS pdf

The efficient support of multiple traffic classes with different quality
of service requirements (end-to-end delay, jitter, loss) poses an extraordinary
complexity in the design of third-generation mobile networks. This task becomes
especially critical for the access network, where radio and transmission
resources are usually scarce. In this paper we present a simulation model of the
ATM-based UMTS (Universal Mobile Telecommunications System) terrestrial
radio access network. The simulator aims to provide a test bed for conducting
further research studies on several topics of potential interest. In particular, we
intend to use the tool for dimensioning ATM links, for evaluating performance
under different mixes of traffic classes, and for investigating quality of service
mechanisms. This wide range of applications has led us to develop a very flexible
simulation model that captures many low level details. Some preliminary
results obtained with the simulator are presented in order to illustrate its capabilities.

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How to Synchronise Telecommunications Networks

How to Synchronise Telecommunications Networks pdf

To meet the telecommunication needs of a fast growing global economy, existing networks are being enhanced using new technologies and many new network operators are emerging after deregulation. Network synchronisation is very important for switching, transmission and data networks, such as telephony, Plesiochronous Digital Hierarchy (PDH), Synchronous Optical Network (SONET), Synchronous Digital Hierarchy (SDH), and Asynchronous Transfer Mode (ATM) networks. It is essential that the telecommunication systems in these networks are synchronised to meet the Quality of Service (QoS) demanded bynetwork users. A network planner has to understand the object of network synchronisation, the related international specifications, the general synchronisation network design requirements, plus the merits and limits of different synchronisation methods before planning a synchronisation network.

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ATM Fundamentals

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SDH_Pocket_Guide

sdh_Pocket_Guide PDF

Contents
-Introduction 1
-What is the situation in the ªsynchronousº market? 4
-Why SDH? 6
-The synchronous digital hierarchie in terms of a layer model 10
-What are the components of a synchronous network? 12
-The STM-1 frame format 16
-How are PDH and ATM signals transported by SDH? 20
-What is the difference between SDH and SONET? 23
-Pointer procedures 26
-AU-4 contiguous concatenation 30
-AU-4 virtual concatenation 32
-Transmission at higher hierarchy levels 33
-Error and alarm monitoring 34
-Automatic protection switching 39
-Synchronization 44
-TMN in the SDH network 47
-SDH measurement tasks 50
-Sensor tests 52
--APS time measurement 53
Performance analysis 55
-Tandem Connection Monitoring 58
-Jitter measurements 59
-Overview of current ITU-T Recommendations 64
-Abbreviations 67

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Designing ATM internetworks

This doc describes current Asynchronous Transfer Mode (ATM) technologies that network
designers can use in their networks today. It also makes recommendations for designing non-ATM
networks so that those networks can take advantage of ATMin the future without sacrificing current investments in cable.

Designing ATM internetworks .pdf

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