Alexandr Skuratov

Correspondence faculty

Speciality: Telecommunicational Systems and Networks

Theme of master's work:

Research and system engineering of provision of services VoIP to room telephone subscribers of the general use

Scientific adviser: Natalia Zhukova

INTRODUCTION

Telecommunications operators, practically sating the market of the big and average cities with a sentence of traditional services of television and low-speed access to network resources, pass to the extension of the list of offered services. First of all passage is carried out at the expense of implementation of multimedia services, such, as IP telephony VoIP, the high definition television (HDTV), IP-television IPTV, video on demand (VoD), network games.
Provision of similar services demands passage to broadband access networks (BAN), thus the operator is forced to search for the compromise between volume of investments and a level of upgrade of a network that sharply brings an attention to the question on a correct choice of technology of creation BAN and an estimation of its economic efficiency.[1,4]

Subject urgency

Main problem at development of a network for one-storey microdistrict is unattainability quality characteristics, as in area with multistorey houses at comparable capital and current network expenditure. Limitless rates induce to loading the big files from P2P networks. The active usage of P2P networks makes impossible usage of services of real time. It is caused by a constant of 100% loading of the proceeding channel in an operating time of the computer of the subscriber.

Scientific significance of operation and value of results

In operation the problem of provision of services of broadband access to a network the Internet in one-storey microdistrict is researched. Optimization of quality characteristics is fulfilled at the active proceeding loading Р2Р of the traffic. Practical value of results of operation consists in application of technology GEPON for improving of technical and economic indexes.

THE MAIN PART

Review of technology GEPON

Technology GEPON (Gigabit Ethernet Passive Optical Network) is one of varieties of technology of passive optical networks PON and one of the advanced variants of building of the communication networks, providing fast rate of information transfer (to 1,2 Gbps). Primary benefit of technology GEPON consists that she allows to use a fiber optical resource of a cable optimally. For example, for connection of 64 subscribers only one fiber optical segment is enough to involve in radius of 20 km.

Primary benefits GEPON:

Usage of standard mechanisms 802.3ah that allows to lower equipment cost considerably in the long term;

• Fall forward of transmission to 1 Gbps in both sides and provision of more broad-band services;
• Support QoS by means of mechanisms 802.1p/TOS. Usage of rigid mechanisms of priority traffics by means of eight selected queues for each type of the traffic is possible. The given mechanisms allow to render such services as VoIP or VoD with a quality assurance;
• Possibility of connection of 64 subscriber devices on branch PON and an effective utilization of an optical fiber;
• Complete support DBA (Dynamic Bandwidth Allocation) — the mechanism of dynamic reallocation of bandpass range according to requests of subscribers and presence of the free band in tree PON. So subscribers to whom the guaranteed bandpass range for data transfer is given, for example, 1Mb/with can receive real speed to 1Gb/with if the band of tree PON remains partially not used (similarly UBR to the traffic in ATM);
• Support of transmission of stream-oriented video (IGMP Snooping);
• Simplicity of setting and service.[7,8]

Implementation QoS by Cisco means

To solve a problem of P2P networks it is possible creation of priority queue. Lists of priorities allow a router to sort and process starting with networks packets depending on the priorities assigned by it. 
Compilation of the ˝white˝ list of priority queue defines most often used services and defines it the highest priority in service. Thus, the problem of identification of the traffic of P2P networks dares.
Table 1 – the List of services

[5]

There is a fragment of listing of configuration files of a router. We create the access list number 101 which contains the auxiliary protocols and UDP datagrams.
access-list 101 permit icmp any any
access-list 101 permit udp any any gt 1
access-list 101 permit tcp any any eq domain

Let's apply this access list to the priority list number 1, and also all other queues.
priority-list 1 protocol ip high list 101
priority-list 1 protocol ip high tcp 5060
priority-list 1 protocol ip high tcp 554
priority-list 1 protocol ip medium tcp 80
priority-list 1 protocol ip medium tcp 81
priority-list 1 protocol ip medium tcp 82
priority-list 1 protocol ip medium tcp 83
priority-list 1 protocol ip medium tcp 8080
priority-list 1 protocol ip medium tcp 8088
priority-list 1 protocol ip medium tcp 8888
priority-list 1 protocol ip medium tcp 8000
priority-list 1 protocol ip medium tcp 1080
priority-list 1 protocol ip medium tcp 443
priority-list 1 protocol ip medium tcp 143
priority-list 1 protocol ip medium tcp 110
priority-list 1 protocol ip medium tcp 993
priority-list 1 protocol ip medium tcp 995
priority-list 1 protocol ip medium tcp 25
priority-list 1 protocol ip medium tcp 2525
priority-list 1 protocol ip medium tcp 465
priority-list 1 protocol ip normal tcp 20
priority-list 1 protocol ip normal tcp 21
priority-list 1 protocol ip medium tcp 23
priority-list 1 protocol ip medium tcp 5190
priority-list 1 protocol ip medium tcp 6667
priority-list 1 protocol ip medium tcp 6668
priority-list 1 protocol ip medium tcp 6669
priority-list 1 protocol ip medium tcp 2041
priority-list 1 protocol ip medium tcp 1863
priority-list 1 protocol ip normal tcp 3128
priority-list 1 default low

We apply it to the interface of the router belonging to an internal network after creation of the priority list.
interface GigabitEthernet0/0
    priority-group 1

[2,3,6]

THE INFERENCE

In the given operation mechanisms of control QoS are considered only and results of their application can be received by simulation modeling or observation over a real network.

THE LIST OF LINKS

• Паркер Тим, Сиян Каранжит. TCP/IP для профессионалов. – СПб: Питер, 2004. – 864 с.
• Хабракен Джо. Как работать с маршрутизаторами Cisco. – М: ДМК Пресс, 2005. – 320 с.
• Бони Джон. Руководство по Cisco IOS. – СПб: Питер, 2007. – 784 с.
• Филимонов Александр. Построение мультисервисных сетей Ethernet. – СПб: БХВ-Петербург, 2007. – 592 с.
• Вегешна Шринивас. Качество обслуживания в сетях IP. — М: Издательский дом "Вильямс", 2003. — 368 с.
• Аллан Леинванд, Брюс Пински. Конфигурирование маршрутизаторов Cisco, 2-е изд. — М. : Издательский дом "Вильямc", 2001. — 368 с.
• Гринфилд Дэвид. Оптические сети. —К.: ООО ТИД "ДС", 2002. 256 с.
• Никульский И.Е. Оптические интерфейсы цифровых коммутационных станций и сети доступа. — М. : Техносфера, 2006. 256 с.