Part_5_new_Switching-Technologies

Part_5_new_Switching-Technologies - Switching Technologies...

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EE450, USC, Zahid 1 Switching Technologies EE450: Introduction to Computer Networks Professor A. Zahid
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EE450, USC, Zahid 2 Switched Network z Long distance transmission is typically done over a network of switched nodes z Nodes not concerned with content of data z Data routed by being switched from node to node
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EE450, USC, Zahid 3 Switching Nodes z Nodes may connect to other nodes only (Transit Switches), or to end hosts and other nodes z Node to node Trunks are multiplexed (TDM, FDM, WDM) z Network is usually partially connected z Some redundant connections are desirable for reliability z Two different switching technologies z Circuit switching z Packet switching Connection-less (ex. IP) Connection-Oriented, a.k.a. Virtual Circuit (ex: ATM, FR)
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EE450, USC, Zahid 4 Circuit Switching z A Circuit is a dedicated (for the duration of the call) communication path between two stations. z Circuit switching requires three phases namely circuit establishment, data transfer and circuit termination z Must have switching capacity and channel capacity to establish connection z Must have intelligence to work out routing z Once connected, transfer is transparent z Developed for voice traffic (Telephony)
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EE450, USC, Zahid 5 Circuit Switching: The PSTN Source “Caller” Central Office “C.O.” Central Office “C.O.”
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This note was uploaded on 12/29/2009 for the course EE 450 at USC.

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Part_5_new_Switching-Technologies - Switching Technologies...

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