A circuit-switched network consists of a set of switches connected by physical links. A connection between two stations is a dedicated path made of one or more links. However, each connection uses only one dedicated channel on each link. Each link is normally divided into n channels by using FDM or TDM. | Chapter 8 Switching Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 8. Figure Switched network 8. Figure Taxonomy of switched networks 8. 8-1 CIRCUIT-SWITCHED NETWORKS A circuit-switched network consists of a set of switches connected by physical links. A connection between two stations is a dedicated path made of one or more links. However, each connection uses only one dedicated channel on each link. Each link is normally divided into n channels by using FDM or TDM. Three Phases Efficiency Delay Circuit-Switched Technology in Telephone Networks Topics discussed in this section: 8. A circuit-switched network is made of a set of switches connected by physical links, in which each link is divided into n channels. Note 8. Figure A trivial circuit-switched network 8. In circuit switching, the resources need to be reserved during the setup phase; the resources remain dedicated for the entire duration of . | Chapter 8 Switching Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 8. Figure Switched network 8. Figure Taxonomy of switched networks 8. 8-1 CIRCUIT-SWITCHED NETWORKS A circuit-switched network consists of a set of switches connected by physical links. A connection between two stations is a dedicated path made of one or more links. However, each connection uses only one dedicated channel on each link. Each link is normally divided into n channels by using FDM or TDM. Three Phases Efficiency Delay Circuit-Switched Technology in Telephone Networks Topics discussed in this section: 8. A circuit-switched network is made of a set of switches connected by physical links, in which each link is divided into n channels. Note 8. Figure A trivial circuit-switched network 8. In circuit switching, the resources need to be reserved during the setup phase; the resources remain dedicated for the entire duration of data transfer until the teardown phase. Note 8. As a trivial example, let us use a circuit-switched network to connect eight telephones in a small area. Communication is through 4-kHz voice channels. We assume that each link uses FDM to connect a maximum of two voice channels. The bandwidth of each link is then 8 kHz. Figure shows the situation. Telephone 1 is connected to telephone 7; 2 to 5; 3 to 8; and 4 to 6. Of course the situation may change when new connections are made. The switch controls the connections. Example 8. Figure Circuit-switched network used in Example 8. As another example, consider a circuit-switched network that connects computers in two remote offices of a private company. The offices are connected using a T-1 line leased from a communication service provider. There are two 4 × 8 (4 inputs and 8 outputs) switches in this network. For each switch, four output ports are folded into the input ports to allow communication between computers .
