MAN networks

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Objectives

General Purpose

* Analyze the use and management of networks Man

Specific objective

* Demonstrate the evolution of local area networks that gave rise to metropolitan area networks

* To present in a network outside Man

Introduction

Through time communication techniques people have been improving and even develop new methods of communication, now the goal is to transmit large amounts of information whether voice, data and video, this is the goal of all those who are dedicated to communications.

Today the transfer and handling of information and is very common, so the advancement of technology has led to the communications revolution, where through the NETS

A network is a set of interconnected computers that can communicate to share data and resources regardless of the physical location of the various devices.

Through a network of processes can be run on another computer or access your files, send messages, share programs

Networks that allow this are advanced and complex equipment. Its effectiveness is based on the confluence of many different components. The design and implementation of a worldwide network of computers is one of the great “technological miracles” of recent decades.

Types of Networks

They are classified according to its size and topology.

Depending on their length have LAN, MAN and WAN.

Among the networks mentioned I will be dealing more deeply what are the MAN networks.

Between the LAN and WAN are the MAN (Metropolitan Area Network). This is a network that covers an entire city, but it uses technology developed for the LAN. The cable television networks (CATV), are examples of analog MAN for television distribution case.

The MAN interest are digital and are for the purpose of connecting computers to each other and no television crews, although some of them may come to use broadband coaxial cable as the transmission medium. Much of the study of the LAN protocols is also valid for the case of the MAN.

We should note that the term “metropolitan” is used in a somewhat generic to describe areas to the size of a city, but can also refer to large multi-site buildings (such as universities). However, as a general utility communication high-speed information, a MAN could have wide use, particularly if the protocol could use existing transmission media, such as CATV and telephone lines stranded duplex cable or optical fibers.

Theoretical Framework

Historical Evolution

In the decades of the 60s and 70s computing was conceived as a hierarchically structured service, largely reflecting the internal structure of organizations. In the 80s came the local area networks (LAN), while proposing new methods of organization structuring based organizations specialized working groups and coordinated with each other, with more dynamic and flexible mechanisms. In the decade of the 90 local area networks FDDI esy large organizations the ability to create large virtual networks through new networking technologies.

So far requirements for interconnecting LANs have been led to applications not requiring high speed, such as message handling system (MHS), email, file transfer (FTAM) and access to databases. However, new applications are demanding the need to interconnect LANs at speeds that allow the integration of voice, data and images. Examples of these applications can be video conferencing, access to image databases and multimedia applications.

The growing need among users of local area networks to obtain data services at high speeds is driving the development of new technologies mainly due to:

The need to interconnect local area networks on a single isolated backbone with greater capacity.

The increase in computing power and decreased cost.

The user benefits are several, among them are:

The increase in distributed processing systems with geographical separation central processing units and other system resources that can be shared by many users or dedicated to specific users requiring additional capabilities.

Increased redundancy of systems that support critical resources to combat losses in the event of a primary system failure.

The evolution of backup procedures (backup) and maintenance, allowing network administrators to develop an effective routines in terms of cost.

Widespread acceptance of user interfaces using WIMPS type applications that integrate text and color graphics.

The evolution of more complex configurations that support technologies come.

All these benefits require a new demand in the user community:

A distributed processing environments and high speed networks that are free from geographical constraints. The creation of metropolitan area networks can meet this demand.

What is a Metropolitan Area Network

A metropolitan area network is a network of high-speed (broadband) to provide coverage in a geographic area, provides multiple integration capacity services by transmitting data, voice and video, over transmission media such as fiber optics and twisted pair copper at speeds ranging from 2 Mbit / s up to 155Mbits / s.

The concept of metropolitan area network represents an evolution of the concept of local area network to a broader scope, covering areas of superior coverage in some cases are not limited to a metropolitan area but can reach and even regional coverage national by interconnecting different metropolitan area networks.

We could also a metropolitan area network represents an evolution of the concept of local area network to a broader scope, covering major areas that in some cases are not limited to a metropolitan area but can get coverage through regional and even national interconnection of different metropolitan area networks.

This type of network is a larger version of the LAN and is usually based on technology similar to this, the main reason to distinguish a MAN with a special category is that a standard has been adopted to work, which is equivalent to IEEE.

Man nets also apply in organizations headquartered in groups near a city, they do not contain switching elements, which diverted the packages for one of several potential output lines. These networks can be public or private.

Metropolitan area networks, geographical location comprise a “city, town”, and distance covered is greater than 4 km. Are networks with two unidirectional buses, each is independently of the other in terms of data transfer.

Metropolitan area networks have many applications, the main ones are:

* Interconnection of Local Area Networks (LAN)

* Interconnection of digital telephone exchanges (PBX and PABX)

* PC to PC Networking

Streaming video and pictures

* Transmission CAD / CAM

* Gateways for wide area networks (WANs)

A metropolitan area network can be public or private. An example would be a large private MAN department or administration buildings across the city, carrying all the voice and data traffic between buildings through its own MAN and external routing information through public operators.

The data could be transported between different buildings, either as packages or channels fixed bandwidth. Video applications can link the buildings for meetings, simulations or project collaboration.

An example of public MAN is the infrastructure that a telecommunications operator installs in a city in order to provide broadband services to its customers located in this geographic area.

The reasons why it is necessary to install a metropolitan area network or the corporate level access to a public network with the same characteristics are summarized below:

-Bandwidth

The high bandwidth required by large computers and shared network applications is the main reason for using metropolitan area networks instead of local area networks.

Network Nodes

Metropolitan Area Networks exceed 500 allow access nodes to the network, so it is very effective for both public and private environments with a large number of jobs.

Extension network

Metropolitan area networks allow a diameter around 50 kms, depending on the scope between network nodes on the cable type used and the technology used. This diameter is sufficient to cover a metropolitan area.

Distance between nodes

Metropolitan area networks allow distances between access nodes of several kilometers, depending on the cable type. This distance is considered sufficient to connect different buildings in a metropolitan area or private campus.

Real-time traffic

Metropolitan area networks guarantee access times of the minimum network, which allows the inclusion of synchronous services necessary for real-time applications where it is important that certain messages pass through the network without delay even when the network load is high.

Integrating voice / data / video

In addition to the minimum access time, synchronous services require a reservation of bandwidth, such is the case of voice and video traffic. Therefore metropolitan area networks are optimal networks for multimedia traffic environments, although not all metropolitan networks support isochronous traffic (transmission at constant intervals).

High Availability

Availability refers to the percentage of time in which the network operates without failure. Metropolitan Area Networks have automatic mechanisms failover, which allows the network to recover normal operation following one. Any failure of a node or cable access is quickly detected and isolated. MAN networks are suitable for environments such as air traffic control, supply stores, banks and other commercial applications where the unavailability of the network has serious consequences.

High reliability

Reliability refers to the error rate of the network while in operation. Means the number error rate of erroneous bits which are transmitted by the network. In general the error rate for optical fiber is less than that of copper wire of equal length. The error rate detected by error detection mechanisms is around 10-20. This feature enables the metropolitan area networks work in environments where mistakes can be disastrous as in the case of air traffic control.

High Security

Optical fiber offers a safe because you can not read or change the optical signal without physically disrupting the link. The cable break and inserting mechanisms outside the network link failure involves temporarily.

Noise Immunity

In spots where the network suffers considerable electromagnetic interference optical fiber provides a media free from noise.

The scope largest metropolitan area networks is the interconnection of LANs over an urban area, but other uses have been identified, such as interconnection of local area networks on a private complex of multiple buildings and networks high speed that eliminate technology barriers. The following describes in detail these application scenarios:

Functional Description

Metropolitan area networks to provide a public interconnection service must provide a set of capabilities that go beyond the mere basic network service. Among these, the most important is to be built and operated within the public telecommunications network.

Components of a metropolitan area network

The components of a metropolitan area network are:

Jobs

Are the systems from which the user demand applications and services provided by the network.

Inside jobs include:

Workstations.

Mainframes.

PCs or compatible.

Network Nodes

Devices are responsible for providing service to the jobs that are part of the network. Its main functions are:

* Temporary storage of information to be transmitted to the transmission channel is released.

* Information filtering circulating the net, accepting only itself. Conversion of the information from the network, in series, to the job information, octets.

* Getting access rights to the transmission medium.

Cabling System

It consists of the cable used to interconnect network nodes and jobs.

Communication protocols

Are the rules and procedures used in a network to communicate between nodes. The protocols define different levels of communication. Thus, metropolitan area networks support level 1 and level 2 part, serving the higher level protocols that follow the hierarchy OSI open systems.

Advantages and disadvantages

The advantages

The advantages of a private network on WAN metropolitan area are:

* Once purchased, the cost of operating a private network of metropolitan area, and the cost of a LAN, are lower than a WAN, due to technical and supported independent of the traffic demand.

* A private MAN is more secure than a WAN.

* A MAN is more suitable for transmission of traffic that requires no assignment of fixed bandwidth.

* A MAN offers a higher bandwidth WAN networks such as X.25 or Integrated Services Digital Network Narrowband (N-ISDN).

Possible disadvantages are:

* Legal and political constraints to the buyer may reject the installation of a private network of metropolitan area. In this situation, you could use a public network of metropolitan area.

* The metropolitan area network can not cover large areas over 50 kilometers in diameter.

* The most widespread technology for interconnecting multiple private networks of buildings is FDDI (Fiber Distributed Data Interface, Interface Fiber Distributed Data). FDDI is a technology that is extensible RAL metropolitan networks thanks to the characteristics of the optical fiber that provides the bandwidth and the required distances in this environment.

Questioning

1. – Type which is a network

A network is a set of interconnected computers that can communicate to share data and resources regardless of the physical location of the various devices.

Through a network of processes can be run on another computer or access your files, send messages, share programs

2. – Write the classification of networks depending on their length and note its significance

As networks have their Extension

* Means LAN Local Area Network

* MAN meaning Metropolitan Area Networks

* WAN Wide Area Networks

3. – What is a Metropolitan Area Network

A metropolitan area network is a network of high-speed (broadband) to provide coverage in a geographic area, provides multiple integration capacity services by transmitting data, voice and video, over transmission media such as fiber optics and twisted pair copper at speeds ranging from 2 Mbit / s up to 155Mbits / s.

4. – Enter where applicable MAN networks

Apply in organizations headquartered in groups near a city, they do not contain switching elements, which diverted the packages for one of several potential output lines. These networks can be public or private.

5. – List three applications MAN Networks

* Interconnection of Local Area Networks (LAN)

* PC to PC Networking

Streaming video and pictures

Conclusion

At the end of my topic I can contribute to metropolitan networks are helpful if you want a network in a city that already include such extensions and allow us to link ourselves with multiple LANs in a safe and agile.

You could also say that the MAN network is just an extension of LANs as this only allowed us to link ourselves alone either in a building or an institution.

Recommendations

This Metropolitan Area Network is recommended because as we saw in their possession a high security features that allow us to work with the network of efficient and safe addition to broader coverage than LANs.

I can also add from my point of view that has a few favorable advantages that make it a recommended network regard to cities.

Bibliography

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