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 Aldosary.na@gmail.com Edited By: Maysoon AlDuwais

Use Demands and Traffic Volume

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.

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

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

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

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.

Example: Symmetrical Traffic Load

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.

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

Performance Demand

Performance Demand Measurements for performance demand: Availability Congestion Delay

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

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 jjfkkkkkkkkkkkkkkkkkkkkkkkkkk 14 14

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

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