Добавил:
Upload Опубликованный материал нарушает ваши авторские права? Сообщите нам.
Вуз: Предмет: Файл:
tksp_m1_eng_Reshetnikova.docx
Скачиваний:
1
Добавлен:
12.11.2019
Размер:
1.19 Mб
Скачать

Table of contents

Table of contents 1

1 section 2

Telecommunication public network 2

1.1 Types of telecommunication networks 2

1.2 The basic elements of the PN (the network elements) 4

2 section 5

Transmission systems 5

2.1 Functions and the basic elements of the transmission systems 5

2.2 The repeater section length 8

2.3 The level diagram 9

2.4 The classification of TrS: 10

2.5 The necessity of the group signal transmission 12

3 The multiplexing methods 13

3.1 Frequency (spectral) division channeling FDC (SDC) 13

3.1.1 Filter method 15

3.1.2 Phase difference method 16

3.2 Time division channeling 16

4 Duplex organization methods 18

4.1.1 Two-wire one-band duplex 18

4.1.2 Two-wire two-band duplex 20

4.1.3 A four-wire one-band duplex 23

4. 2 Decoupling devices 23

5 Transmission channels. 27

5.1 The main parameters of VBC 27

5.2 Transit connections 28

6. Types of the communication networks 30

6.1 Classification of communication networks 30

6.2 A Telephone Connection 31

6.3 An ATM Connection 32

6.4 An MPLS Connection 34

6.5 A Wavelength Routing Optical Network Connection 34

Introduction

The purpose of the course: the study of the common principals of the primary network and its transmission systems designing

Telecommunication transmission systems together with the switching devices provide trunk (long-distance) and international communication network organization.

The contents of a telecommunication transmission systems course:

The module

The section’s name

3.1

Telecommunication network

Transmission systems

Analog transmission systems with the spectral-division channeling

3.2

3.3

Digital transmission systems (DTS) of a plesiochronous hierarchy (PDH) with the direct coding

PDH DTS with the grouping

3.4

4.1

4.2

DTS of a synchronous digital hierarchy (SDH)

Systems with the spectral multiplexing (WDM)

Batch communication methods

Radio-relay transmission systems (RRTS)

1 Section Telecommunication public network

1.1 Types of telecommunication networks

A new synonym for electrical communication is the Telecommunication.

LAN

TCN

ST

DCN

DCN

ST

LAN

Figure 1.1

ST – subscriber terminal

DCN – departmental communication network

LAN – local area network

TCN – is the complex of hardware that is providing the electric signal transmission between the subscriber terminals with a required quality.

The telephone set, the mobile phone, the computer and others can be also used as the subscriber terminals.

Departmental communication network (DCN), local area network (LAN) and separated subscriber groups can be also the network clients. The TCN provides the communication between them. The hookup of ST and TCN creates the information network.

Subscriber terminal + TCN = IN

(physical person, LAN,

providers of the different

information services)

Customer access network

Mainline communications network

Single-site network

Transport telecommunication network

Figure 1.2

According to the old classification (approximately up to the middle 90th of last century) the telecommunication network is subdivided into: primary and secondary networks. The primary network (PN) is used for transmission of the different types information. The secondary network (SN) is a specialized network that provides the transmission of the same type messages and works over the channels that are given by PN. So SNs are the subscribers of PN services.

There are 3 levels in the primary network of Ukraine and the CIS (СНГ) (Commonwealth of Independent States) countries:

1. The mainline communications network (MCN) connects the region centers between themselves and with Kiev, and also provides the international communication network organization.

2. The intraareal network (IAN) is connected with the administrative division of the country (=intraregional).

There are 25 regions in Ukraine, 26 intraareal networks (Sevastopol is separated).

3. The single-site network (SSN) consists of metropolitan area network (MAN) and rural area network (RAN). It provides the communication between the city and the nearest villages.

In the modern terminology TCN is subdivided into 2 parts:

  • Transport telecommunication network (TTN)

  • Customer access network (CAN)

By the International Telecommunications Union (ITU) determination Customer access network includes the communication facilities that allow performing the electric signal transmission from the subscriber terminal to the corresponding telecommunications provisioning point.

P N – is the hookup of transmission lines, which connect the different commutation stations (exchange) between themselves.

TCN = PN + SD (switching devices)

Three-level model of the PN (according to the old terminology)

The single-site network

The mainline communications network

Figure 1.3

ATE – automatic telephone exchange

The comparison of the models respectively to the new and to the old terminologies

SSN

3rd subscriber

3rd subscriber

2nd subscriber

1st subscriber

2nd subscriber

1st subscriber

TTN

CAN

MCN

Figure 1.4

The transport telecommunication network (TTN) is the hookup of communication systems and the propagation medium, intended for the information transfer between the cities. It consists of main and intraareal communication networks.

Customer access network (CAN) is the hookup of the subscriber`s lines and the single-site network stations that provides the subscriber terminals access to the transport network and the organization of the local communication without the interconnection with the transport network.

The Ukrainian telecommunication network is based on the united nation-wide communication network of Ukraine (UNCNU).

Соседние файлы в предмете [НЕСОРТИРОВАННОЕ]