08-05-2013, 03:25 PM
Performance Evaluation of Traffic and Load Balancing mechanism in LAN
Performance Evaluation.docx (Size: 16.59 KB / Downloads: 22)
INTRODUCTION
In the first page we have to take the input from the user for the packet attributes.
The packet attributes we will be considering are:-
1. Packet type
2. Packet length
3. Packet source
4. Packet destination
Then according to the values and data provided for the attributes we have to perform the following calculations:-
Channel Capacity:-
We have to assume the capacity of the channel and will keep it fix.
Transmission Time:-
Transmission time is the amount of time from the beginning until the end of the message transmission.It is the time from the first bit until the last bit of the message has left the transmission node.
Packet Transmission Time=Packet size/Bit Rate
Where:- packet size is in bit and
Bit rate is in bit/sec
Ex- bit rate=100Mbit/sec and maximum packet size is 1526bytes, then
Transmission time= 1526*8/100 000 000
= 122microsec.
Propagation delay:-
It is the time after full message has been sent from the sender, until it has reached the receiving node.
It depends on the physical medium of the link and is in the range 2*10^8m/sec for copper wire and 3*10^8m/sec for wireless communication.
Propagation time=distance/propagation speed
Where:- distance is in metres and propagation speed in m/sec.
Ex-communication over UTP copper cable with maximum distance of 100m between computer and switching node results in maximum link propagation delay=100m/200 000 000m/sec
=0.5microsec
Packet delivery time/Latency:-
It is the time from the first bit leaves the transmission until the last is received.
Packet delivery time=transmission time +
propagation time.
If the network connection is mediated by several physical links and forwarding nodes, the network delivery time depends on the sum of delivery times each link and also on the packet queuing time(which is varying and depends on the traffic load from other connections and the process delay of the forwarding nodes.