Medium Access Control Sublayer Notes | EduRev

: Medium Access Control Sublayer Notes | EduRev

 Page 1


Gursharan Singh Tatla
mailme@gursharansingh.in
www.eazynotes.com
Medium Access Control 
Sublayer
31-Mar-2011 1
www.eazynotes.com
Page 2


Gursharan Singh Tatla
mailme@gursharansingh.in
www.eazynotes.com
Medium Access Control 
Sublayer
31-Mar-2011 1
www.eazynotes.com
Introduction
? In broadcast networks, several stations share a 
single communication channel.
? The major issue in these networks is, which station 
should transmit data at a given time.
? This process of deciding the turn of different stations 
is known as Channel Allocation.
? To coordinate the access to the channel, multiple 
access protocols are required.
? All these protocols belong to the MAC sublayer.
31-Mar-2011 2
www.eazynotes.com
Page 3


Gursharan Singh Tatla
mailme@gursharansingh.in
www.eazynotes.com
Medium Access Control 
Sublayer
31-Mar-2011 1
www.eazynotes.com
Introduction
? In broadcast networks, several stations share a 
single communication channel.
? The major issue in these networks is, which station 
should transmit data at a given time.
? This process of deciding the turn of different stations 
is known as Channel Allocation.
? To coordinate the access to the channel, multiple 
access protocols are required.
? All these protocols belong to the MAC sublayer.
31-Mar-2011 2
www.eazynotes.com
Introduction
? Data Link layer is divided into two sublayers:
? Logical Link Control (LLC)
? Medium Access Control (MAC)
? LCC is responsible for error control & flow control.
? MAC is responsible for multiple access resolutions.
31-Mar-2011 3
www.eazynotes.com
Network Layer
Logical Link Control (LLC)
Medium Access Control (MAC)
Physical Layer
Data Link Layer
Page 4


Gursharan Singh Tatla
mailme@gursharansingh.in
www.eazynotes.com
Medium Access Control 
Sublayer
31-Mar-2011 1
www.eazynotes.com
Introduction
? In broadcast networks, several stations share a 
single communication channel.
? The major issue in these networks is, which station 
should transmit data at a given time.
? This process of deciding the turn of different stations 
is known as Channel Allocation.
? To coordinate the access to the channel, multiple 
access protocols are required.
? All these protocols belong to the MAC sublayer.
31-Mar-2011 2
www.eazynotes.com
Introduction
? Data Link layer is divided into two sublayers:
? Logical Link Control (LLC)
? Medium Access Control (MAC)
? LCC is responsible for error control & flow control.
? MAC is responsible for multiple access resolutions.
31-Mar-2011 3
www.eazynotes.com
Network Layer
Logical Link Control (LLC)
Medium Access Control (MAC)
Physical Layer
Data Link Layer
Channel Allocation Problem
? In broadcast networks, single channel is shared by 
several stations.
? This channel can be allocated to only one 
transmitting user at a time.
? There are two different methods of channel 
allocations:
? Static Channel Allocation
? Dynamic Channel Allocation
31-Mar-2011
www.eazynotes.com
4
Page 5


Gursharan Singh Tatla
mailme@gursharansingh.in
www.eazynotes.com
Medium Access Control 
Sublayer
31-Mar-2011 1
www.eazynotes.com
Introduction
? In broadcast networks, several stations share a 
single communication channel.
? The major issue in these networks is, which station 
should transmit data at a given time.
? This process of deciding the turn of different stations 
is known as Channel Allocation.
? To coordinate the access to the channel, multiple 
access protocols are required.
? All these protocols belong to the MAC sublayer.
31-Mar-2011 2
www.eazynotes.com
Introduction
? Data Link layer is divided into two sublayers:
? Logical Link Control (LLC)
? Medium Access Control (MAC)
? LCC is responsible for error control & flow control.
? MAC is responsible for multiple access resolutions.
31-Mar-2011 3
www.eazynotes.com
Network Layer
Logical Link Control (LLC)
Medium Access Control (MAC)
Physical Layer
Data Link Layer
Channel Allocation Problem
? In broadcast networks, single channel is shared by 
several stations.
? This channel can be allocated to only one 
transmitting user at a time.
? There are two different methods of channel 
allocations:
? Static Channel Allocation
? Dynamic Channel Allocation
31-Mar-2011
www.eazynotes.com
4
Static Channel Allocations
? In this method, a single channel is divided among 
various users either on the basis of frequency or on 
the basis of time.
? It either uses FDM (Frequency Division Multiplexing) 
or TDM (Time Division Multiplexing).
? In FDM, fixed frequency is assigned to each user, 
whereas, in TDM, fixed time slot is assigned to each 
user.
31-Mar-2011
www.eazynotes.com
5
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