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Metropolitan Area Network In Detail Information Technology Essay


A computer network is a network of personal computers and other devices interconnected by communication programs. These channels are used to aid communication among users and allows the user to talk about and gain access to resources on the network. Network can be grouped based on their wide selection of characteristics depending on the physical opportunity.

Local area network(LAN):- a local area network is a network that is used to inter hook up computers and other network devices in a restricted geographic area such as school, house and properties within a specific area.

Wide Area network(WAN):- is some type of computer network which protects a large geographical area like a city or country. The network can can also be long to intercontinental distance by using communication channels such as phone lines, wires and air waves.

Back bone Network (BBN) :-is a part of a network which interconnects different little bit of a network and gives journey for exchange of information.

Metropolitan Network (MAN):- is a large network that spans over a city or campus.

Let us consider Metropolitan Area Network in detail.

Metro Ethernet is some type of computer network which is employed for metropolitan area such as places and large urban Areas predicated on the Ethernet standards. It's mostly used as a metropolitan gain access to network to connect large users(subscribers) and businesses to the internet. It 's physical scope is fall season between Wide Area Network (WAN) and local area network (LAN). In addition, it provides Internet connection to LAN in metropolitan region, and links them to Wider area sites like the web. 1? 2?

Ethernet Criteria- Ethernet requirements as identified by the Institute for Electrical and Electronic Designers(IEEE) standard 802. 3 defines guidelines for configuring ethernet and the protocols used for communicating of personal computers within the network.

Overview of Metro Ethernet

Metro Ethernet network is a set-up that links geographically separated LAN's or WAN's or backbone sites of internet providers (ISP). Metro Ethernet Network provides network access throughout the world through their central protocol called the Metro Ethernet. Metro Ethernet

is available in various plans of standard compliant interfaces like 10Mbps, 100Mbps, 1000Mbps and 10Gbps

Metro Ethernet's predominant purpose is available sector where in fact the requirement for high quality speech, video, as well as data copy is a necessity. The existing technology infrastructure is dependant on SONET/SDH(Synchronous Optical Network/Synchronous Digital Hierarchy) structures which is expensive and have problems of scalability and limited strap width.

Metro Ethernet over comes these issues of the on SONET/SDH architecture and also provides more additional features such as

Easy to make use of:- since most devices on the network use Ethernet interface so that network supervision and procedure is simplified.

Cost effective:- Ethernet interfaces are much cheaper than that of SONET/SDH -Flexibility and Scalability:- MAN can provides many variety services and subscribers have the probability to change their bandwidth as their interest. 3?

Service professional metro Ethernet is a assortment of Part 2 or coating 3 switches or routers connected through optical fiber with a various topologies like wedding ring, star, full or partly mesh networks. Metro Ethernet provides different kinds of deployments such as

pure Ethernet MAN:- this is the simplest and cheapest with less configuration necessity with shortcoming of Macintosh personal computer table over flow on the switches convergence of the SPT protocol. it offers only part 2 network equipments

SONET/SDH founded MAN:- this is established based on the existing SDH. and comes with an advantage of trustworthiness due to the SDH owns safety mechanisms. with brief coming of having limited traffic executive and its is costly.

MPLS established Ethernet MANS:-this type of MANS are costly and requires considerable configuration however they have high scalability, and potential to aggregate in virtually any type of traffic. 4?


Ethernet is a common communication protocol used to create a network or an area Area Network (LAN). E thernet originated at Xerox Parc between 1973 and 1975.

The basic need for metro Ethernet happened when telecom companies was required to inter-connect different Ethernet LAN's. Recently dedicated point to point lines were used to hook up these geographically disconnected LAN's. A gateway router was configured on either part of the LAN network interconnected by way of a TCP/IP across private lines. This design worked out very expensive particularly when the network was big.

Gradually the point to point circuits were substituted by Shape relay and ATM. These protocols were nearly the same as private lines but relatively inexpensive. These connections were poor so companies began joining their private LAN's across cities through the internet. This got many loop slots in it as the bond was very insecure. As progression telecom companies came up with "Private IP Networks". This is available for long distance travel. But this process was too expensive and was not preferred by companies. This draw back was settled with secure internet encryption protocols such as IPSec and firewall improvements. Post to the the bond was still gradual and the over head on IP headers were huge.

Companies improved their infrastructure and the internet emerged a fantastic choice for interconnection of Ethernet LAN's. Though there were a very few disadvantages to the methods such as VPN containers being very expensive and hackers could intercept any network though firewalls were installed. This issue was fixed through MPLS(Multi route Label Swap) private IP systems.

The Metro Ethernet was developed in concurrence with MPLS and resulted as a typical called Metro Ethernet Specifications. 5?


Previously we had to connect to the internet through the dial up connection. There is many criticism on dial up links as they did not provide a regular interconnection, the dial up was not affordable for the common man and it was overpriced.

As technology developed dial up relationships gave way for Metro Ethernets. Metro Ethernets were offered by different rates of speed for personalized needs which benefited the business enterprise sector enormously. Since metro Ethernets did not use telephone brand connections this led to not having to install additional cellphone lines to be able to use both telephone and hook up to the internet concurrently. The significant factor of Metro Ethernets is it is available in different packages that customers could choose their required offer. Metro Ethernets offers frequent rate in during peak hours of network traffic regardless of the number of users using the same interconnection. 6?

Metro Ethernet Service types-

Metro Ethernet Message board (MEF) supplies the most elementary service type

STRUCTURE- Let us look at a ethernet work in a city owned by a particular ISP owner. A customer equipment (CE) is provided on the subscriber side which is employed to connect to a network with a UNI. The UNI is a typical ethernet interface. The client is concerbed only with his particular UNI software to connect to the internet. The many communication technologies involved in communication such as transport, application level protocols do not concern the client. This communication approach is easy and simple. This system is scalable and trust suitable.

EVC (Ethernet Virtual Interconnection)- EVC is a precise as an instance of your asscociation of two or more UNI's through which data is exceeded in the form of ethernet casings 10?. The main functions of EVC are

Connecting client UNI's on either part and transmitting data as ethernet structures between them easily and firmly.

The ethernet frames are delivered very much like how these were directed with same Apple pc address and and other guidelines.

The Metro Ethernet community has defined two basic service types

1. Ethernet brand service type-

The E-Line service provides at point to point Ethernet virtual Connection (EVC) between two User network Interfaces (UNI). The E-Line is employed as indicate point connectivity.

Figure 1:E-LINE->9?

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2. Ethernet LAN Service type-

The Ethernet LAN service provides multipoint connection. The E-LAN service can connect several interfaces. Each UNI is linked to a multipoint Ethernet Virtual Connection (EVC). As more UNI's are added these are linked to the same EVC thus simplifying the procedure of provisioning and service activation. 8?

Figure 2 : E-LAN ->9?

http://connectedplanetonline. com/images/archive/tpinfocus01213. jpg


Limitations of Ethernet in MEN in comparison with ATM and Frame relay are

1. End to End QOS guarantees-

Connection admission for new service requests with specific QOS is accepted readily?

Scheduling and policing of packets to keep up proper usage of bandwidth in spite of competition to the learning resource?

Ensuring optimal path establishment through the network?

2. Coverage Mechanisms-

Slow failure recovery in ether networks when compared with automatic packet moving over (APS) or SONET network.

There is no device to quarantine faulty routes in the network as in the case of SONET network. 8?


1. Multi protocol Label Move (MPLS) provides traffic anatomist capability, guaranteed bandwidth and runs on any Ethernet transfer.

2. To handle problems like slow-moving recovery multiple spanning tree is a proposal to permit several loop free path in a VLAN environment. 8?

Standards of MEF-

The Metro Ethernet Community (MEF) recognizes itself as the standard defining body for Carrier Ethernet. To address these limitations the MEF happens to be focusing on




Services and testing

The above mentioned areas have sub groups working on each of them to provide documents, agreements, frameworks and interoperability content to aid Metro Ethernet as the normal network by choice internationally. 8?

Carrier Ethernet- Carrier ethernet can be an extension to ethernet services essential for ISP providers to provide ethernet services to end customers.

Definition-Carrier Ethernet is defined as a ubiquitous, standardized, carrier-class Service and Network identified by five attributes that distinguish Carrier Ethernet from familiar LAN founded Ethernet 11?

Standardized services




Service Management

Market Scenario

As referenced in 9 the global market for Ethernet equipment reached

$3. 8 billion in 2004 and doubled in four years to $7. 6 billion in 2008 and

expected to expand at similar rates. As the MEF defines more requirements to define carrier school Ethernet services, the marketplace for "carrier Ethernet" switches and routers are also expected both Ethat a luxurious rate. Ethernet-over-Sonet market. Adva is the next in the Ethernet-over-WDM. Cisco systems comes third in both markets.

Nortel sites lead the worldwide market for ernet-over-Sonet equipment and Ethernet-over-wavelength-division-multiplexing (WDM). Alcatel is the second in

The biggest market for Ethernet was Asia back 2004 which added to 39% of the full total market revenue last year. North America contributed to 35% of the revenue while European countries, Central and Latin America contributed to 5% of the marketplace earnings. 9?


We can thus summary our break down on Metro Ethernet by declaring that Metro Ethernet has great global necessity and even though it is not utilized internationally many companies are starting to implement it due to the many advantages it has.

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