132B_1_Sec04_Switching_090710A

132B_1_Sec04_Switching_090710A - Switching Methods: Circuit...

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Switching Methods: Circuit and Packet Switching Professor Izhak Rubin Electrical Engineering Department UCLA rubin@ee.ucla.edu © 2010-2011 by Professor Izhak Rubin
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Prof. Izhak Rubin 2 Switching Methods ± Circuit Switching ± Example: Telephone Networks ± ± Connectionless, datagram ± Example: INTERNET ± Connection oriented, virtual circuit switching ± Examples: X.25, BISDN (Broadband Integrated Services Digital Networks) ATM (Asynchronous Transfer Mode) Networks, Frame Relay Networks
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Prof. Izhak Rubin 3 Line Sharing: Fixed vs. Statistical Time frame Time frame Time frame 1 2 3 4 1 2 3 4 1 2 3 4 Circuit switched transmission across TDM circuit 1 Packet switched transmission of packets
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Prof. Izhak Rubin 4 Circuit switching N1 N2 N5 N3 N4 (N1,N5) (N1,N4) (N1,N5) (N1,N4) Link L(1,2) Messages (N1,N5) (N1,N4) Circuit Switching concept: Connection Oriented; user signals the network; network sets up a connection; a circuit is established to support transport of messages that are part of the connection; circuit consists of dedicated link capacity resources along the selected path.
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Prof. Izhak Rubin 5 Circuit switching: Circuits Time frame Time frame Time frame 1 2 3 4 1 2 3 4 1 2 3 4 Link (N1,N3) Time frame Time frame Time frame 1 2 3 4 1 2 3 4 1 2 3 4 Link (N3,N5) Circuit (N1,N5) established across links (N1,N3) and (N3, N5) through dedicated TDM slots; e.g., slot 1 in each frame is dedicated to this circuit
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Prof. Izhak Rubin 6 Circuit switching: Circuits Time frame Time frame Time frame 1 2 3 4 1 2 3 4 1 2 3 4 Link (N1,N3) Time frame Time frame Time frame 1 2 3 4 1 2 3 4 1 2 3 4 Link (N3,N4) Circuit (N1,N4) established across links (N1,N3) and (N3,N4) through dedicated TDM slots
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Prof. Izhak Rubin 7 Circuit switching: Principles N1 N2 N5 N3 N4 (N1,N5) (N1,N4) (N1,N5) (N1,N4) Link L(1,2) Circuit switch
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Prof. Izhak Rubin 8 Principle of circuit switching ± A connection is established ± A dedicated-bandwidth circuit is allocated to each connection across a selected path/route ± The circuit consists of a tandem collection of link-circuits along the route links ± While multiple link-circuits can be multiplexed across a link, a single connection is permitted to use the circuit BW resources
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Prof. Izhak Rubin 9 Example: Circuit allocated for a connection ± Circuit/path (N1, N5) consists of link-circuits/links (N1, N3) and (N3, N5). This circuit is dedicated to an (N1, N5) connection. ± Circuit entails: ± Selected path: N1-N3-N5 ± Dedicated time slots (or other communications capacity resources) allocated across each link along the path.
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Prof. Izhak Rubin 10 Circuit switching: signaling ± Phases of circuit switching ± Phase 1 (signaling): circuit set-up phase ± The signaling network is used to set-up a circuit for the requesting connection ± In-band vs. out-of-band (common channel signaling – CCS) signaling channels and networks ± Route is selected ± Circuit switches are notified; switching matrices are set
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Prof. Izhak Rubin
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This note was uploaded on 01/12/2011 for the course EE 132B taught by Professor Izhakrubin during the Fall '09 term at UCLA.

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132B_1_Sec04_Switching_090710A - Switching Methods: Circuit...

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