# Multiplexing, Circuit Switching and Packet Switching. Circuit Switching

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1 Multiplexing, Circuit Switching and Packet Switching Circuit Switching Old telephone technology For each connection, physical switches are set in the telephone network to create a physical circuit That s the job of the switching office 1

2 Circuit Switching - Example Physical copper connection set up when call is made Switching offices Circuit Switching (cont d) Switches are set up at the beginning of the connection and maintained throughout the connection Network resources reserved and dedicated from sender to receiver Not a very efficient strategy A connection holds a physical line even during silence periods (when there is nothing to transmit) 2

3 Sharing a Media: Multiplexing Multiplexing means combining different communication streams into just one communication line Example 1: Frequency-Division Multiplexing Used by radio,tv and cable TV Different stations transmit over different channels (with different frequency) Example 2:Time-Division Multiplexing For use with digital signals! Used for the communication between telephone switching offices Time-Division Multiplexing Example N streams R = sampling rate of each stream NR = sampling rate of multiplexed stream

4 Time-Division Demultiplexing Example N streams R = sampling rate of each stream NR = sampling rate of multiplexed stream Time-Division Multiplexing (TDM) From N streams, each with a bitrate of R bits/s, we generate a single signal with bitrate of N*R bits/s Example: Digitized speech with sampling rate F = 8KHz and B = 8 bits per sample (R = 64 Kb/s) Multiplexing N = 24 streams together creates a stream of 1.5 Mb/s This is the bitrate provided by a T1 carrier 4

5 TDM (cont d) Resources (time slots on the link) are reserved and allocated to each user Every n-th time slot, the line is dedicated to one predetermined sender How long is the time slot in our previous example? What happens if one sender has nothing to transmit? That time slot is wasted! NOTE: There is an inherent constant delay E.g., stream #3 has to wait until the first 4 bits of stream #1 and the first 4 bits of stream #2 are transmitted What is the constant delay in our previous example? Packet Switching Sharing by taking turn Model: conveyor belt in a warehouse Items are picked from the storage room and placed on the conveyor belt every time a customer makes an order Different customers may request a different number of items Different users items may be interspersed on the conveyor belt (they are multiplexed ) Networks use a similar idea Packet Switching Packetize data to transfer Multiplex it onto the wire Packets from different connections share the same link 5

6 Packet Switching Example A Header Payload C C D C D C D D B D Packet Switching Each packet is composed by the payload (the data we want to transmit) and a header The header contains information useful for transmission, such as: Source (sender s) address Destination (recipient s) address Packet size Sequence number Error checking information 6

7 Packet Switching (cont d) The header introduces overhead, that is, additional bits to be sent Therefore, it is not wise to have packets that are too small What happens if the payload is just 1 bit? Computer Addresses Each computer attached to a network is assigned a unique number (called address) A packet contains the address of the computer that sent it and the address of the computer to which it is sent. Packet Switching (cont d) In general, packets need not be of the same size The Internet Protocol specifies the maximum size Maximum transmission unit (MTU) No minimum size But, header size is fixed (e.g., 20 bytes for TCP/IP) Packets are generated by the network hardware The application (e.g., ) does not know that the data to be transmitted is packetized When packets are received, they are put together before the application accesses the data 7

8 Packet Switching (cont d) What kind of delay should we expect? Time-division multiplexing: constant delay Packet switching multiplexing: variable delay (it depends on the traffic on the line) Conveyor belt example: if there are many customers before you, you may have to wait more Packetized communication is used by many devices Computer, printers, digital TV, cellular phones, Queueing What happens when a computer needs to send packets but the link is congested? Needs to queue the packets as they are generated before they are transmitted What happens when a queue becomes too long? Packets are dropped! Queues form (and packets are dropped) also at the intermediate nodes (routers) How can the receiver detected that a packet was dropped on its way? Look at the packet sequence number! 8

9 TDM vs Packet Switching Example: 1Mb/s link Users are active only 10% of the time A user is active when s/he has bits to transmit When they transmit, users send 100 Kb/s streams Hence, only 10 users can be active at the same time Time-Division Multiplexing: Only 10 user can connect at the same time Every time a user is not active, the time slot is wasted! Packet-switching More users can connect As long as no more than 10 users are active at the same time! (which will rarely happen) Circuit Switching vs Packet Switching Circuit switching Must set up a connection (initial delay) Connection is reliable Resources are dedicated Therefore they are used inefficiently! Packet switching Very small set-up delay Efficient shared use of resources Possible congestion and consequent packet dropping 9

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