1. Nada Al Dosary Aldosary.na@gmail.com Edited By: Maysoon AlDuwais
CT 1502 Network Planning Methods Lecture 3 part II (Ch7: Introduction to Networks By Prof.Saad elhaj Bakry)
Nada Al Dosary
Edited By: Maysoon AlDuwais

2. Use Demands and Traffic Volume

3. Use Demand and Traffic Volume
What is Use Demand?
It is the traffic load generated from users in different network locations, in any data format (text-photo- voice-video …etc), to be transmitted to other network locations.

4. Use demand and Traffic Volume
There are three types of Traffic Load Usage:
General Traffic Load
Symmetrical Traffic Load
Centralized Traffic Load

5. Example: Locations for network access: Source of load
8 different Access Locations Source of Load (Traffic)

6. Types on Traffic Load Usage
General Traffic Load: Traffic load have no specific form.

7. Types on Traffic Load Usage
Symmetrical Traffic Load: Traffic load from first network location to second is equal to traffic load from the second network location to the first.
Example: Traffic load exchanged between different countries in the global telephone network.

8. Example: Symmetrical Traffic Load

9. Types on Traffic Load Usage
Centralized Traffic Load: Centralized network location controls communication to all other network locations, and these network location cannot contact each other directly.
Example: Used in private network that requires special management or monitoring control.

10. Use Demands and Traffic Volume
Central Traffic load: A5 is the center 10

11. Performance Demand

12. Performance Demand Measurements for performance demand: Availability
Congestion
Delay

13. Availability Availability Availability:
The “Readiness” of network to be used.
Or reduction in network failure
T: Period of time determined to measure network availability
S: Period of time (within T) where the network is available.
Availability
Duration for measuring availability T
Availability duration (within T) S
Unavailability duration
(T – S)
Availability measurement
V = S / T
Unavailability measurement
NV = (T - S) / T 13 13

14. Congestion
Congestion is the increase in traffic load to a level that exceeds the available network capacity.
Congestion reasons:
No enough capacity
No enough hardware
Congestion measurement is defined as the percentage of rejected traffic load to the total traffic load in a specific period of time.
Congestion= Rejected load/ total load
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15. Congestion
Congestion measurement is usually used in circuit switched networks for telephone networks (PSTN)
Congestion
Total load L
Carried load S
Rejected load
(L – S)
Congestion measurement
B = (L - S) / L
Non-congestion measurement
NB = S / L 15

16. Delay
The latency in traffic exchanged in the network due to limited network capacity, .
occurs in store-and-forward networks
Delay increase if the traffic load increase.
Delay
Processing duration in switches P
Wait time (before send) W
Sending time (In channels) S
Propagation time G
Duration of transmitting information from one site to another
D = P + W + S + G 16