Download Communicating Systems & Ntwks. Traffic, Performance by G. Fiche, G. Hebuterne PDF

By G. Fiche, G. Hebuterne

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Additional resources for Communicating Systems & Ntwks. Traffic, Performance

Sample text

A router has two main functions: the routing of the packets and forwarding. The routing ofpackets The router has a routing table which contains a more or less detailed knowledge of the network topology. It is from this table that it calculates the route to be followed by a packet for a particular destination. IP routing itself is an enormous subject. As already indicated in the section on network architecture, the IP network ensures reliability of communication thanks to its many interconnections.

We will then speak for a network or part of a network of the load (or traffic) profile. 18 sets out a typical profile example based on observations on telephone exchanges. 18. Telephone traffic profile during a day The peak hours can be seen to be 0930-1130 hours, 1430-1800 hours and 1830-2100 hours, and of course for this type of traffic and the network considered, the off-peak hours at night and from 1230-1330. During these periods, variations in call time are also observed. Call times tend to increase in the evening: there are just as many erlangs even though the number of calls per time unit, CA/s (call attempt per second), is the lower.

S. protocol, and MEGACO is the IETF H248 protocol of ITU-T (see Chapter 2). e. e. bearer independent call control. The evaluation of the call set-up time in this type of network will be considered in detail as an example later in this book (see Chapter 10). 22 Communicating Networks: Traffic and Performance More generally, the NGN is intended to serve all types of telephone accesses, such as analogue telephones, ISDN telephones, IP telephones, PCs, private networks and ADSL lines. These equipments are then either directly linked to the transport layer, or interfaced by means of a media gateway that carries out several functions.

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