EE450-U5-SwitchingTechnologies-Nazarian-Summer11

EE450-U5-SwitchingTechnologies-Nazarian-Summer11 - EE450...

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EE450 Computer Networks Switching Technologies Shahin Nazarian Summer 2011
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Shahin Nazarian/EE450/Summer 2011 2 Switched (or Switching) Technologies
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Shahin Nazarian/EE450/Summer 2011 3 Switching Technologies (Cont.) ___________ technologies typically use a fully- connected topology, e.g. a fully-connected MAN is not practical They are partially connected, but with redundant paths, so multiple routes exist between two end systems so that there are alternatives if one goes wrong Typical implementation: circuit-switched in ________ layer, virtual circuit in _________ layer, connectionless packet-switched in ___________ layer
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Shahin Nazarian/EE450/Summer 2011 4 Switched Network
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Shahin Nazarian/EE450/Summer 2011 5 Circuit-Switched Network Go back to our previous discussions on how for a phone call, a dedicated circuit (per ______________ __________) is established. Note that only a portion of the trunks in the path of the dedicated circuit is used (e.g., either one frequency portion in FDM, or a time slot in TDM) Once the caller ends the phone call, all resources that had been dedicated become free 64kbps is dedicated to each phone call (Question, how many calls can be carried through a 2Gbps shared trunk?) Traffic comes in the form of ______ (such as voice, and video) or _____ , i.e., data Circuit-switched network is optimized for ______ traffic (and real time applications) & not good for _________
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Shahin Nazarian/EE450/Summer 2011 6 Circuit-Switched – Delay Components
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Shahin Nazarian/EE450/Summer 2011 7 Circuit-Switched Total Delay
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Shahin Nazarian/EE450/Summer 2011 8 Circuit-Switched Total Delay – Example Suppose all the links in a circuit-switched network have a bit rate of 56Kbps. Also it takes 900msec and 200msec to establish and disconnect an end-to-end circuit respectively, before a sender host can transmit data How long does it take to send a file of 1MB from host A to host B? The propagation delay between A and B is 0.045 seconds Transmission delay = __ × 10 6 ____/____ bps =142.86 seconds Total delay = ___ + 142.86 + ____ + ____ =144.005s
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Shahin Nazarian/EE450/Summer 2011 9 Connectionless Packet-Switched In TCP and UDP (layer 4) the notions of connection-oriented and connectionless imply the handshaking process existence for TCP (and no handshaking process for UDP,) however the notion of connectionless packet switching (layer 3,) means no setup connection In circuit switching addressing is done only during __________ , and once the circuit is set up, we don’t need any addressing, because the resources are going to be dedicated However in connectionless packet switching networking, everything is shared and there is no dedicated resources, so the message is broken into packets and each packet needs to be addressed to let the router know where to send the packet.
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