ETHERNET

Jun 21 • General • 3973 Views • 5 Comments on ETHERNET

MEDIUM ACCESS

ETHERNET

The LAN connections are of numerous types among those Ethernet is the one that is the most popular LAN connection. The generation of Ethernet took place in the following direction-:

1.            Traditional Ethernet

2.            Fast Ethernet

3.            Gigabit Ethernet

In 1976 the traditional Ethernet was created having a data rate of 10 mbps and fast internet the next version has a speed of 100 mbps where as the gigabit has a speed of 1000 mbps.

As the computer is connected to  the internet through the LAN  then it needs all the five models of the internet model  where the network transport and application layer are used for each and every LAN .

The data link layer is basically divided into two layers -:

•             Logic link control

•             Medium access control

MAC  SUBLAYER

The MAC sub layer can be abbreviated as medium access control sub layer.The MAC sub layer governs the operation of the access methodology it also frames the data received from the upper layer and passes it to the sub layer for encoding.

BLUETOOTH ARCHITECHTURE

The basic unit of Bluetooth is piconet  and a piconet contains a master node and up to seven active  slave nodes and a collection of piconet connected by a bridge node in a large room is known as scarnet.

A Bluetooth standard allows a maximum of 255 packed nodes in addition to 7 slave nodes the parked nodes are the devices that the masters has switched to low power state to reduce power drain.

All the communications are to be done by master and slave a slave- slave communication is not possible.

IEEE STANDARDS AND ITS CHANGES

1.            802.11-:In 1997 the Institute of Electrical and Electronics Engineers created the first WLAN and called it 802.11 Unfortunately the 802.11 only supported a maximum network bandwidth of 2 Mbps which is  too slow for most of the applications so the  802.11 wireless products are neither  manufactured nor used any longer .

2.            802.11b-:  IEEE expanded the original 802.11 standard in the year 1991 creating the 802.11b. 802.11b supports a  bandwidth of maximum  11 Mbps, comparable to traditional Ethernet. 802.11b also uses the same unregulated radio signaling frequency of2.4 GHz as it is preferred  to lower the production costs.

3.            802.11a-:After  802.11b was developed the  IEEE created a second extension to the original 802.11 standard the 802.11a and this supports a  bandwidth up to 54 Mbps and signals in a regulated frequency of 5 GHz.

4.            802.11g-: In 2002 and 2003 a newer standard called 802.11g emerged on the market. 802.11g combines  the best of both 802.11a as well as 802.11b.

5.            802.11n-:The newest IEEE standard in the Wi-Fi category is 802.11n. It was designed to improve on 802.11g in the amount of bandwidth supported by utilizing multiple wireless signals and antennas (called MIMO technology) instead of one.

IEEE 802.11- Architecture

The IEEE 802.11 corresponds to OSI physical layer. It is divided into two layers -:

•             Mac sub layer- this layer solves the channel allocation problem

•             LLC sub layer-this layer interact with the network layer

The ieee standard consist of three frames –

•             Data frame

•             Control frame

•             Management frame

QUESTIONS AND ANSWERS

1.State the difference between half duplex and full duplex transmission modes?

Ans- in case of half duplex only one entity can be sent at a time where as in full duplex more than one entity can be sent at a time.

2. What are the five components of data system?

Ans- The five components of a data communication system are   sender,receiver,transmission,medium,message and protocol.

GATE Syllabus-

1. Gate Syllabus for Electronics and Communication 2014

2. Gate Syllabus for Computer Science and Information Technology 2014

3. Gate Syllabus for Engineering Science 2014

IES Syllabus-

1. IES Syllabus for Electronics and Telecomm

2. IES Syllabus for General ability

 

 

About the Author:

Well i am a hardworking girl and believe in positive attitude and love for work....born on 7th January 1991 and now a btech graduate in the field of electrical and electronics.

Tell us Your Queries, Suggestions and Feedback

Your email address will not be published.

5 Responses to ETHERNET

  1. GATE Syllabus of Computer Science and Information Technology 2014 says:
    at

    […] interchanged through computer.It include topics- ISO/OSI stack, LAN technologies ( Token ring,Ethernet ), Routing algorithms, Flow and error control techniques ,Congestion control,  IP(v4), TCP/UDP and […]

    Reply
  2. Seema Mishra says:
    at

    In this article, a very close look at networking, and in particular the Ethernet networ­king standard, so you can understand the actual mechanics of how all of these computers connect to one another.Plaese go through this article .

    Reply
  3. Sumit Mukherjee says:
    at

    Ethernet is an important section of LAN connectivity. For establishing a network into a campus or any small area, we use the LAN connection. The various categories of that ethernet has been mentioned in that article along with the IEEE formats.

    Reply
  4. priyanka nayak says:
    at

    Ethernet is basically a data link layer technology for local area networks. This article clearly describes all about Ethernet which is a basic concept of networking

    Reply
  5. Surabhi Singh says:
    at

    A very useful article for engineering students…… get a fair idea about Ethernet by going through this article.

    Reply

« »