Semester 1 2007-2008Copyright USM EEE442 Computer Networks The Data Link / Network Layer Functions: Switching En. Mohd Nazri Mahmud MPhil (Cambridge, UK)

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Presentation transcript:

Semester Copyright USM EEE442 Computer Networks The Data Link / Network Layer Functions: Switching En. Mohd Nazri Mahmud MPhil (Cambridge, UK) BEng (Essex, UK) Room 2.14

Semester Copyright USM Switching Two types –Circuit Switching –Packet Switching

Semester Copyright USM Switched Network

Semester Copyright USM Nodes a collection of nodes and connections is a communications network nodes may connect to other nodes only, or to stations and other nodes network is usually partially connected –some redundant connections are desirable have two different switching technologies –circuit switching –packet switching

Semester Copyright USM Circuit Switching uses a dedicated path between two stations has three phases –establish –transfer –disconnect inefficient –channel capacity dedicated for duration of connection –if no data, capacity wasted set up (connection) takes time once connected, transfer is transparent

Semester Copyright USM Public Circuit Switched Network

Semester Copyright USM Circuit Establishment

Semester Copyright USM Circuit Switch Elements

Semester Copyright USM Blocking or Non-blocking blocking network –may be unable to connect stations because all paths are in use –used on voice systems non-blocking network –permits all stations to connect at once –used for some data connections

Semester Copyright USM Space Division Switch

Semester Copyright USM 3 Stage Space Division Switch

Semester Copyright USM Time Division Switching modern digital systems use intelligent control of space & time division elements use digital time division techniques to set up and maintain virtual circuits partition low speed bit stream into pieces that share higher speed stream individual pieces manipulated by control logic to flow from input to output

Semester Copyright USM Packet Switching circuit switching was designed for voice packet switching was designed for data transmitted in small packets packets contains user data and control info –user data may be part of a larger message –control info includes routing (addressing) info packets are received, stored briefly (buffered) and past on to the next node

Semester Copyright USM Packet Switching

Semester Copyright USM Advantages line efficiency –single link shared by many packets over time –packets queued and transmitted as fast as possible data rate conversion –stations connects to local node at own speed –nodes buffer data if required to equalize rates packets accepted even when network is busy priorities can be used

Semester Copyright USM Switching Techniques station breaks long message into packets packets sent one at a time to the network packets can be handled in two ways –datagram –virtual circuit

Semester Copyright USM Datagram Diagram

Semester Copyright USM Virtual Circuit Diagram

Semester Copyright USM Virtual Circuits v Datagram virtual circuits –network can provide sequencing and error control –packets are forwarded more quickly –less reliable datagram –no call setup phase –more flexible –more reliable

Semester Copyright USM Packet Size

Semester Copyright USM Circuit v Packet Switching performance depends on various delays –propagation delay –transmission time –node delay range of other characteristics, including: –transparency –amount of overhead

Semester Copyright USM Event Timing