WIRELESS LAN, HOME AREA NETWORK , PHY AND MAC LAYER

Jun 17 • Notes • 1561 Views • 3 Comments on WIRELESS LAN, HOME AREA NETWORK , PHY AND MAC LAYER

WIRELESS LOCAL AREA NETWORK (WLAN)

A Wireless Local Area Network (WLAN) is  a flexible data communication system frequently augment rather than replace a wired LAN inside a building or campus. WLANs use radio frequency to spread and receives information over the air,decrease the requirement for wired attachemnt. This notebook computer is connected to a wireless access point using a computer card wireless card

First wireless computer communication network is brought by Norman Abramson professor at the Hawaii university.

There two types of WLANs

  • Peer-to-peer
  • Bridge

Network within Home Area

A home network or home area network (HAN) is a residential local area network (LAN) for communicating between digital devices typically deploy in the home, usually a few number of personal computers and accessories, such as printers and mobile computing devices. An important function is the distribution of Internet access, often a broadband service provisioned by fiber-to-the-home or via Cable Internet access, Digital Subscriber Line (DSL) or mobile broadband by Internet service providers (ISPs.

 

 

 

CONNECTION TECHNOLOGIES FOR HOME AREA NETWRORK

There are three connection technology and these are

  • New wire
  • No new wire
  • Wireless

Wireless Communication System by oureducation.in


 

 

 

 

 

PROTOCOL

 

802.11 Standards

802.11
protocol

Release[6]

Freq.
(GHz)

Bandwidth
(MHz)

Data rate per stream
(Mbit/s)
[7]

Allowable
MIMOstreams

Modulation

Approximate indoor range[citation needed]

Approximate outdoor range[citation needed]

(m)

(ft)

(m)

(ft)

Jun 1997

2.4

20

1, 2

1

DSSS,FHSS

20

66

100

330

a

Sep 1999

5

20

6, 9, 12, 18, 24, 36, 48, 54

1

OFDM

35

115

120

390

3.7[A]

5,000

16,000[A]

b

Sep 1999

2.4

20

1, 2, 5.5, 11

1

DSSS

35

115

140

460

g

Jun 2003

2.4

20

6, 9, 12, 18, 24, 36, 48, 54

1

OFDM,DSSS

38

125

140

460

n

Oct 2009

2.4/5

20

7.2, 14.4, 21.7, 28.9, 43.3, 57.8, 65, 72.2[B]

4

OFDM

70

230

250

820[8]

40

15, 30, 45, 60, 90, 120, 135, 150[B]

70

230

250

820[8]

ac (DRAFT)

Dec 2012

5

20

up to 87.6[9]

8

40

up to 200[9]

80

up to 433.3[9]

160

up to 866.7[9]

ad

~Feb 2014

2.4/5/60

up to 7000

 

PHY LAYER

It is a physical layer which is the lowest or first layer in OSI model out of seven layers. It is also termed as PHY layer. It consists of basic networking hardware transmission technologies of a network. In the OSI model it is most complex layer because of excess of available hardware technologies with extensively varying characteristics.

It provides the transmission medium electrical, mechanical and procedural boundary. The physical layer specifies the frequencies to broadcast, shapes and properties of electrical connector, similar low level parameter and modulation scheme to use. To effect the transmission or reception of electronic signals physical layer transmits the logical communication into hardware specific operation.

MAC LAYER

It is a media access control layer ant it is a sub layer of data link layer which is second layer of OSI model out of seven layer. Between the logic link control sub layer and physical layer MAC acts as an interface. Medium access controller is a hardware that implements the MAC.

Unicast, multicast, and broadcast communication service is provided by the channel.

In the MAC sublayer some function are performed are

  • Transmit and receive normal frame
  • Backoff function and half-duplex retransmission
  • Frame check sequence
  • Interframe gap enforcement
  • Append/remove MAC address

QUESTION & ANSWER
1. What is WLAN??

ANSWER-It is a wireless local area network, using some wireless distribution method WLAN links two or more devices.

2.  which connection technologies used for the home area network??

ANSWER-There are three connection technologies used for the home area network are

  • New wire
  • No new wire
  • Wireless

3. what is the application of PHY layer??

ANSWER-Physical layer specifies the frequencies to broadcast, shapes and properties of electrical connector, similar low level parameter and modulation scheme to use.

4. what function are performed in the MAC sublayer??

ANSWER-In MAC sublayer the function performed are

  • Transmit and receive normal frame
  • Backoff function and half duplex retransmission Frame check sequence
  • Interframe gap enforcement
  • Append/remove MAC address

 

GATE Syllabus-

1.GATE Syllabus for Electronics and Communication 2014

2.GATE Syllabus for Engineering Science 2014

IES Syllabus-

1.IES Syllabus for General Ability

2. IES Syllabus for Electronics and Telecommunication 

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3 Responses to WIRELESS LAN, HOME AREA NETWORK , PHY AND MAC LAYER

  1. Seetha Manoharan says:

    This post is really nice to get the details clearly. this gives the complete detail of latest networking technologies.

  2. Dinesh says:

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  3. Soubarna Biswas says:

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